Systems/methods of adaptively varying a bandwidth and/or frequency content of communications

• US 8,660,169 B1
• Filed: 10/31/2013
• Issued: 02/25/2014
• Est. Priority Date: 06/22/2005
• Status: Active Grant

• Current Assignee: Odyssey Wireless, Inc.
• Original Assignee: Odyssey Wireless, Inc.
• Inventors: Karabinis, Peter D.
• Primary Examiner(s): FILE, ERIN M
• Application Number:
  US14/068,138
• Publication Number:
  US 20140056341A1
• Time in Patent Office: 117 Days
• Field of Search: 375/219
• US Class Current: 375/219
• CPC Class Codes: H04B 1/69 Spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 2201/70715 with application-specific features
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04K 2203/18 for wireless local area networks or WLAN
• CPC Class Codes: H04K 3/25 based on characteristics of target signal or of transmission as countermeasure against surveillance H04K3/827, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04K 3/827 using characteristics of target signal or of transmission as countermeasure against jamming H04K3/25, e.g. using direct sequence spread spectrum or fast frequency hopping spread spectrum techniques H04B1/69
• CPC Class Codes: H04L 1/0043 Realisations of complexity reduction techniques, e.g. use of look-up tables
• CPC Class Codes: H04L 1/009 arrangements specific to transmitters
• CPC Class Codes: H04L 1/0091 arrangements specific to receivers, e.g. format detection detection of data rate H04L25/0262; detection of coding rate H04L1/0046
• CPC Class Codes: H04L 23/02 adapted for orthogonal signalling
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 25/03987 Equalisation for sparse channels
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 12/04 Key management, e.g. using generic bootstrapping architecture [GBA]
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/08 Access security
• CPC Class Codes: H04W 12/50 Secure pairing of devices
• CPC Class Codes: H04W 36/185 : using make before break
• CPC Class Codes: H04W 48/02 : Access restriction performed under specific conditions
• CPC Class Codes: H04W 84/045 : using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A bandwidth that is allocated to a transmitted waveform need not be contiguous in frequency space and a frequency content of the transmitted waveform may vary, as needed, even on a signaling interval by signaling interval basis, in order to accommodate a desired transfer rate, reduce or avoid interference and/or enhance an end user experience. According to embodiments of the invention, a set of frequencies that is used to provide frequency content to elements of a waveform alphabet, used to form the transmitted waveform, is varied thus varying a frequency content of the transmitted waveform. A time span associated with the elements of the waveform alphabet may also be varied. Various transmitter/receiver embodiments are disclosed including direct synthesis transmitter/receiver embodiments.

Claims

1. A method of conveying information using a transceiver that includes a wireless transmitter and a wireless receiver;

wherein the wireless transmitter comprises a transmit antenna, a power amplifier, a digital-to-analog converter, an encoder, a transmit filter, a transmit waveform alphabet and a transmit processor; and

wherein the wireless receiver comprises a receive antenna, a receive filter, a low noise amplifier, an analog-to-digital converter, a decoder, a correlator, a receive processor and a receive waveform alphabet;

the method comprising;

processing by the transmit processor an input bit sequence {b} to thereby form an information symbol sequence {I_k} that is to be transmitted;

wherein k denotes discrete time;

mapping by the transmit processor the information symbol sequence {I_k} that is to be transmitted into a baseband waveform sequence {U_k(nT)} by using first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein for each value of k, n takes on a plurality of values and T>

0;

varying by the transmit processor a spectral content of the baseband waveform sequence {U_k(nT)}, without resorting to conventional chipping with a binary waveform, by using the first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content and by basing respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} on said first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content;

encoding by the encoder elements of the baseband waveform sequence {U_k(nT)};

filtering by the transmit filter the baseband waveform sequence {U_k(nT)};

converting by the digital-to-analog converter the baseband waveform sequence {U_k(nT)} from a discrete time representation to a continuous time representation;

amplifying by the power amplifier the baseband waveform sequence {U_k(nT)};

radiating by the transmit antenna the baseband waveform sequence {U_k(nT)};

receiving by the receive antenna a waveform sequence {U_j(iT)} that includes first and second waveform symbols that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein j denotes discrete time and wherein for each value of j, i takes on a plurality of values;

filtering by the receive filter the waveform sequence {U_j(iT)};

amplifying by the low noise amplifier the waveform sequence {U_j(iT)};

converting by the analog-to-digital converter the waveform sequence {U_j(iT)} from a continuous time representation thereof to a discrete time representation thereof;

correlating by the correlator the waveform sequence {U_j(iT)} with a plurality of elements of the receive waveform alphabet that includes first and second waveform elements that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

mapping by the receive processor the waveform sequence {U_j(iT)} into a receive information symbol sequence {I_j}; and

forming an output bit sequence by decoding by the decoder the information symbol sequence {I_j}.

2. The method according to claim 1, wherein the transmit processor is further configured to distribute a frequency content of the baseband waveform sequence {U_k(nT)} over first and second frequency intervals that are separated therebetween by a third frequency interval and to refrain from distributing the frequency content over the third frequency interval.

3. The method according to claim 1, wherein the transmit processor is further configured to vary a frequency range that is used to provide frequency content to the baseband waveform sequence {U_k(nT)} such that third and fourth waveform symbols of the baseband waveform sequence {U_k(nT)} are defined over respective third and fourth frequency ranges that differ therebetween.

4. The method according to claim 3, wherein the third and fourth frequency ranges that differ therebetween, are separated therebetween by a range of frequencies that is devoid of providing frequency content to the third and fourth waveform symbols.

5. The method according to claim 1, wherein for a first value of k, n=1, 2, . . . , N;

wherein for a second value of k, n=1, 2, . . . , M;

wherein the first and second values of k differ therebetween; and

wherein N and M differ therebetween.

6. The method according to claim 5, wherein for the first value of k a duration of a respective first waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a first value NT and wherein for the second value of k the duration of a respective second waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a second value MT that differs from the first value NT.

7. The method according to claim 1, wherein first and second values of k comprise respective first and second successive integer values of k;

and wherein respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} corresponding to the first and second values of k differ therebetween in spectral content and are radiated by the transmit antenna over respective first and second successive transmission intervals that are adjacent therebetween and are separated therebetween by one transmit/receive symbol interval.

8. The method according to claim 1, wherein at least one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly responsive to a predetermined statistical distribution.

9. The method according to claim 8, wherein the predetermined statistical distribution comprises a Gaussian distribution.

10. The method according to claim 1, wherein the baseband waveform sequence {U_k(nT)} is devoid of a regularly repeating peak amplitude level while the wireless transmitter is conveying information.

11. The method according to claim 1, wherein the wireless transmitter/receiver is/are devoid of a modulator and/or frequency translator and is/are configured to convey information by transmitting/receiving the waveform sequence {U_k(nT)}/{U_j(iT)} without subjecting the waveform sequence {U_k(nT)}/{U_j(iT)} to a modulator and/or frequency translator.

12. The method according to claim 1, wherein the wireless transmitter/receiver comprise(s) a modulator and/or frequency translator and is/are configured to convey information by transmitting/receiving the waveform sequence {U_k(nT)}/{U_j(iT)} and subjecting the waveform sequence {U_k(nT)}/{U_j(iT)} to the modulator and/or frequency translator.

13. The method according to claim 1, wherein each one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly and independently of the information symbol sequence {I_k};

and wherein the first and second waveform elements that differ therebetween in spectral content are statistically independent and orthogonal therebetween.

14. A method of conveying information using a wireless transmitter that includes a transmit antenna, a power amplifier, a digital-to-analog converter, an encoder, a transmit filter, a transmit waveform alphabet and a transmit processor;

the method comprising;

processing by the transmit processor an input bit sequence {b} to thereby form an information symbol sequence {I_k} that is to be transmitted;

wherein k denotes discrete time;

mapping by the transmit processor the information symbol sequence {I_k} that is to be transmitted into a baseband waveform sequence {U_k(nT)} by using first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein for each value of k, n takes on a plurality of values and T>

0;

varying by the transmit processor a spectral content of the baseband waveform sequence {U_k(nT)}, without resorting to conventional chipping with a binary waveform, by using the first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content and by basing respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} on said first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content;

encoding by the encoder elements of the baseband waveform sequence {U_k(nT)};

filtering by the transmit filter the baseband waveform sequence {U_k(nT)};

converting by the digital-to-analog converter the baseband waveform sequence {U_k(nT)} from a discrete time representation to a continuous time representation;

amplifying by the power amplifier the baseband waveform sequence {U_k(nT)}; and

radiating by the transmit antenna the baseband waveform sequence {U_k(nT)}.

15. The method according to claim 14, wherein the transmit processor is further configured to distribute a frequency content of the baseband waveform sequence {U_k(nT)} over first and second frequency intervals that are separated therebetween by a third frequency interval and to refrain from distributing the frequency content over the third frequency interval.

16. The method according to claim 14, wherein the transmit processor is further configured to vary a frequency range that is used to provide frequency content to the baseband waveform sequence {U_k(nT)} such that third and fourth waveform symbols of the baseband waveform sequence {U_k(nT)} are defined over respective third and fourth frequency ranges that differ therebetween.

17. The method according to claim 16, wherein the third and fourth frequency ranges that differ therebetween, are separated therebetween by a range of frequencies that is devoid of providing frequency content to the third and fourth waveform symbols.

18. The method according to claim 14, wherein for a first value of k, n=1, 2, . . . , N;

wherein for a second value of k, n=1, 2, . . . , M;

wherein the first and second values of k differ therebetween; and

wherein N and M differ therebetween.

19. The method according to claim 18, wherein for the first value of k a duration of a respective first waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a first value NT and wherein for the second value of k the duration of a respective second waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a second value MT that differs from the first value NT.

20. The method according to claim 14, wherein first and second values of k comprise respective first and second successive integer values of k;

and wherein respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} corresponding to the first and second values of k differ therebetween in spectral content and are radiated by the transmit antenna over respective first and second successive transmission intervals that are adjacent therebetween and are separated therebetween by one transmit/receive symbol interval.

21. The method according to claim 14, wherein at least one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly responsive to a predetermined statistical distribution.

22. The method according to claim 21, wherein the predetermined statistical distribution comprises a Gaussian distribution.

23. The method according to claim 14, wherein the baseband waveform sequence {U_k(nT)} is devoid of a regularly repeating peak amplitude level while the wireless transmitter is conveying information.

24. The method according to claim 14, wherein the wireless transmitter is devoid of a modulator and/or frequency translator and is configured to convey information by transmitting the waveform sequence {U_k(nT)} without subjecting the waveform sequence {U_k(nT)} to a modulator and/or frequency translator.

25. The method according to claim 14, wherein the wireless transmitter comprises a modulator and/or frequency translator and is configured to convey information by transmitting the waveform sequence {U_k(nT)} following having subjected the waveform sequence {U_k(nT)} to the modulator and/or frequency translator.

26. The method according to claim 14, wherein each one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly and independently of the information symbol sequence {I_k};

and wherein the first and second waveform elements that differ therebetween in spectral content are statistically independent and orthogonal therebetween.

27. A method of conveying information using a wireless receiver that includes a receive antenna, a receive filter, a low noise amplifier, an analog-to-digital converter, a decoder, a correlator, a receive processor and a receive waveform alphabet;

the method comprising;

receiving by the receive antenna a waveform sequence {U_j(iT)} that includes first and second waveform symbols that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein j denotes discrete time and wherein for each value of j, i takes on a plurality of values and T>

0;

filtering by the receive filter the waveform sequence {U_j(iT)};

amplifying by the low noise amplifier the waveform sequence {U_j(iT)};

converting by the analog-to-digital converter the waveform sequence {U_j(iT)} from a continuous time representation thereof to a discrete time representation thereof;

correlating by the correlator the waveform sequence {U_j(iT)} with a plurality of elements of the receive waveform alphabet that includes first and second waveform elements that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

mapping by the receive processor the waveform sequence {U_j(iT)} into a receive information symbol sequence {I_I}; and

forming an output bit sequence by decoding by the decoder the information symbol sequence {I_j}.

28. The method according to claim 27, wherein a spectral content of the waveform sequence {U_j(iT)} is distributed over first and second frequency intervals that are separated therebetween by a third frequency interval that is devoid of spectral content associated with the waveform sequence {U_j(iT)}.

29. The method according to claim 27, wherein the waveform sequence {U_j(iT)} includes a variable frequency range whereby third and fourth waveform symbols of the waveform sequence {U_j(iT)} comprise respective third and fourth frequency ranges that differ therebetween.

30. The method according to claim 29, wherein the third and fourth frequency ranges that differ therebetween, are separated therebetween by a range of frequencies that is devoid of providing frequency content to the third and fourth waveform symbols.

31. The method according to claim 27, wherein for a first value of j of the waveform sequence {U_j(iT)}, i=1, 2, . . . , N;

wherein for a second value of j of the waveform sequence {U_j(iT)}, i=1, 2, . . . , M;

wherein the first and second values of j differ therebetween; and

wherein N and M differ therebetween.

32. The method according to claim 31, wherein for the first value of j a duration of a respective first waveform symbol of the waveform sequence {U_j(iT)} comprises a first value NT and wherein for the second value of j the duration of a respective second waveform symbol of the waveform sequence {U_j(iT)} comprises a second value MT that differs from the first value NT.

33. The method according to claim 27, wherein first and second values of j comprise respective first and second successive integer values of j;

and wherein respective first and second waveform symbols of the waveform sequence {U_j(iT)} corresponding to the first and second values of j differ therebetween in spectral content and are received by the receive antenna over respective first and second successive time intervals that are adjacent therebetween and are separated therebetween by one transmit/receive symbol interval.

34. The method according to claim 27, wherein at least one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly responsive to a predetermined statistical distribution.

35. The method according to claim 34, wherein the predetermined statistical distribution comprises a Gaussian distribution.

36. The method according to claim 27, wherein the waveform sequence {U_j(iT)} is devoid of a regularly repeating peak amplitude level.

37. The method according to claim 27, wherein the wireless receiver is devoid of a modulator and/or frequency translator and is configured to receive information by receiving and processing the waveform sequence {U_j(iT)} without subjecting the waveform sequence {U_j(iT)} to a modulator and/or frequency translator.

38. The method according to claim 27, wherein the wireless receiver comprises a modulator and/or frequency translator and is configured to receive information by receiving the waveform sequence {U_j(iT)} and subjecting the waveform sequence {U_j(iT)} to the modulator and/or frequency translator.

39. The method according to claim 27, wherein each one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly;

and wherein the first and second waveform elements that differ therebetween in spectral content are statistically independent and orthogonal therebetween.

40. The method according to claim 27, wherein said correlating comprises using a Fourier transform operation.

41. A system that is used to convey information;

wherein the system comprises a transceiver that includes a wireless transmitter and a wireless receiver;

wherein the wireless transmitter comprises a transmit antenna, a power amplifier, a digital-to-analog converter, an encoder, a transmit filter, a transmit waveform alphabet and a transmit processor; and

wherein the wireless receiver comprises a receive antenna, a receive filter, a low noise amplifier, an analog-to-digital converter, a decoder, a correlator, a receive processor and a receive waveform alphabet;

wherein the transmit processor is configured to process an input bit sequence {b} to thereby form an information symbol sequence {I_k} that is to be transmitted;

to map the information symbol sequence {I_k} that is to be transmitted into a baseband waveform sequence {U_k(nT)} by using first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween; and

to vary a spectral content of the baseband waveform sequence {U_k(nT)}, without resorting to conventional chipping with a binary waveform, by using the first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content and by basing respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} on said first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content;

wherein k denotes discrete time;

wherein for each value of k, n takes on a plurality of values; and

wherein T>

0;

wherein the encoder is configured to encode elements of the baseband waveform sequence {U_k(nT)};

wherein the transmit filter is configured to filter the baseband waveform sequence {U_k(nT)};

wherein the digital-to-analog converter is configured to convert the baseband waveform sequence {U_k(nT)} from a discrete time representation to a continuous time representation;

wherein the power amplifier is configured to amplify the baseband waveform sequence {U_k(nT)};

wherein the transmit antenna is configured to radiate the baseband waveform sequence {U_k(nT)};

wherein the receive antenna is configured to receive a waveform sequence {U_j(iT)} that includes first and second waveform symbols that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein j denotes discrete time and wherein for each value of j, i takes on a plurality of values;

wherein the receive filter is configured to filter the waveform sequence {U_j(iT)};

wherein the low noise amplifier is configured to amplify the waveform sequence {U_j(iT)};

wherein the analog-to-digital converter is configured to convert the waveform sequence {U_j(iT)} from a continuous time representation thereof to a discrete time representation thereof;

wherein the correlator is configured to correlate the waveform sequence {U_j(iT)} with a plurality of elements of the receive waveform alphabet that includes first and second waveform elements that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein the receive processor is configured to map the waveform sequence {U_j(iT)} into a receive information symbol sequence {I_j}; and

wherein the decoder is configured to decode the receive information symbol sequence {I_j} to thereby form an output bit sequence.

42. The system according to claim 41, wherein the transmit processor is further configured to distribute a frequency content of the baseband waveform sequence {U_k(nT)} over first and second frequency intervals that are separated therebetween by a third frequency interval and to refrain from distributing the frequency content over the third frequency interval.

43. The system according to claim 41, wherein the transmit processor is further configured to vary a frequency range that is used to provide frequency content to the baseband waveform sequence {U_k(nT)} such that third and fourth waveform symbols of the baseband waveform sequence {U_k(nT)} are defined over respective third and fourth frequency ranges that differ therebetween.

44. The system according to claim 43, wherein the third and fourth frequency ranges that differ therebetween, are separated therebetween by a range of frequencies that is devoid of providing frequency content to the third and fourth waveform symbols.

45. The system according to claim 41, wherein for a first value of k, n=1, 2, N;

wherein for a second value of k, n=1, 2, . . . , M;

wherein the first and second values of k differ therebetween; and

wherein N and M differ therebetween.

46. The system according to claim 45, wherein for the first value of k a duration of a respective first waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a first value NT and wherein for the second value of k the duration of a respective second waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a second value MT that differs from the first value NT.

47. The system according to claim 41, wherein first and second values of k comprise respective first and second successive integer values of k;

and wherein respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} corresponding to the first and second values of k differ therebetween in spectral content and are radiated by the transmit antenna over respective first and second successive transmission intervals that are adjacent therebetween and are separated therebetween by one transmit/receive symbol interval.

48. The system according to claim 41, wherein at least one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly responsive to a predetermined statistical distribution.

49. The system according to claim 48, wherein the predetermined statistical distribution comprises a Gaussian distribution.

50. The system according to claim 41, wherein the baseband waveform sequence {U_k(nT)} is devoid of a regularly repeating peak amplitude level while the wireless transmitter is conveying information.

51. The system according to claim 41, wherein the wireless transmitter/receiver is/are devoid of a modulator and/or frequency translator and is/are configured to convey information by transmitting/receiving the waveform sequence {U_k(nT)}/{U_j(iT)} without subjecting the waveform sequence {U_k(nT)}/{U_j(iT)} to a modulator and/or frequency translator.

52. The system according to claim 41, wherein the wireless transmitter/receiver comprise(s) a modulator and/or frequency translator and is/are configured to convey information by transmitting/receiving the waveform sequence {U_k(nT)}/{U_j(iT)} and subjecting the waveform sequence {U_k(nT)}/{U_j(iT)} to the modulator and/or frequency translator.

53. The system according to claim 41, wherein each one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly and independently of the information symbol sequence {I_k};

and wherein the first and second waveform elements that differ therebetween in spectral content are statistically independent and orthogonal therebetween.

54. A system that is used to convey information;

wherein the system comprises a wireless transmitter that includes a transmit antenna, a power amplifier, a digital-to-analog converter, an encoder, a transmit filter, a transmit waveform alphabet and a transmit processor;

wherein the transmit processor is configured to process an input bit sequence {b} to thereby form an information symbol sequence {I_k} that is to be transmitted;

to map the information symbol sequence {I_k} that is to be transmitted into a baseband waveform sequence {U_k(nT)} by using first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween; and

to vary a spectral content of the baseband waveform sequence {U_k(nT)}, without resorting to conventional chipping with a binary waveform, by using the first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content and by basing respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} on said first and second waveform elements of the transmit waveform alphabet that differ therebetween in spectral content;

wherein k denotes discrete time;

wherein for each value of k, n takes on a plurality of values; and

wherein T>

0;

wherein the encoder is configured to encode elements of the baseband waveform sequence {U_k(nT)};

wherein the transmit filter is configured to filter the baseband waveform sequence {U_k(nT)};

wherein the digital-to-analog converter is configured to convert the baseband waveform sequence {U_k(nT)} from a discrete time representation to a continuous time representation;

wherein the power amplifier is configured to amplify the baseband waveform sequence {U_k(nT)}; and

wherein the transmit antenna is configured to radiate the baseband waveform sequence {U_k(nT)}.

55. The system according to claim 54, wherein the transmit processor is further configured to distribute a frequency content of the baseband waveform sequence {U_k(nT)} over first and second frequency intervals that are separated therebetween by a third frequency interval and to refrain from distributing the frequency content over the third frequency interval.

56. The system according to claim 54, wherein the transmit processor is further configured to vary a frequency range that is used to provide frequency content to the baseband waveform sequence {U_k(nT)} such that third and fourth waveform symbols of the baseband waveform sequence {U_k(nT)} are defined over respective third and fourth frequency ranges that differ therebetween.

57. The system according to claim 56, wherein the third and fourth frequency ranges that differ therebetween, are separated therebetween by a range of frequencies that is devoid of providing frequency content to the third and fourth waveform symbols.

58. The system according to claim 54, wherein for a first value of k, n=1, 2, . . . , N;

wherein for a second value of k, n=1, 2, . . . , M;

wherein the first and second values of k differ therebetween; and

wherein N and M differ therebetween.

59. The system according to claim 58, wherein for the first value of k a duration of a respective first waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a first value NT and wherein for the second value of k the duration of a respective second waveform symbol of the baseband waveform sequence {U_k(nT)} comprises a second value MT that differs from the first value NT.

60. The system according to claim 54, wherein first and second values of k comprise respective first and second successive integer values of k;

and wherein respective first and second waveform symbols of the baseband waveform sequence {U_k(nT)} corresponding to the first and second values of k differ therebetween in spectral content and are radiated by the transmit antenna over respective first and second successive transmission intervals that are adjacent therebetween and are separated therebetween by one transmit/receive symbol interval.

61. The system according to claim 54, wherein at least one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly responsive to a predetermined statistical distribution.

62. The system according to claim 61, wherein the predetermined statistical distribution comprises a Gaussian distribution.

63. The system according to claim 54, wherein the baseband waveform sequence {U_k(nT)} is devoid of a regularly repeating peak amplitude level while the wireless transmitter is conveying information.

64. The system according to claim 54, wherein the wireless transmitter is devoid of a modulator and/or frequency translator and is configured to convey information by transmitting the waveform sequence {U_k(nT)} without subjecting the waveform sequence {U_k(nT)} to a modulator and/or frequency translator.

65. The system according to claim 54, wherein the wireless transmitter comprises a modulator and/or frequency translator and is configured to convey information by transmitting the waveform sequence {U_k(nT)} following having subjected the waveform sequence {U_k(nT)} to the modulator and/or frequency translator.

66. The system according to claim 54, wherein each one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly and independently of the information symbol sequence {I_k};

and wherein the first and second waveform elements that differ therebetween in spectral content are statistically independent and orthogonal therebetween.

67. A system that is used to convey information;

wherein the system comprises a wireless receiver that includes a receive antenna, a receive filter, a low noise amplifier, an analog-to-digital converter, a decoder, a correlator, a receive processor and a receive waveform alphabet;

wherein the receive antenna is configured to receive a waveform sequence {U_j(iT)} that includes first and second waveform symbols that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein j denotes discrete time;

wherein for each value of j, i takes on a plurality of values; and

wherein T>

0;

wherein the receive filter is configured to filter the waveform sequence {U_j(iT)};

wherein the low noise amplifier is configured to amplify the waveform sequence {U_j(iT)};

wherein the analog-to-digital converter is configured to convert the waveform sequence {U_j(iT)} from a continuous time representation thereof to a discrete time representation thereof;

wherein the correlator is configured to correlate the waveform sequence {U_j(iT)} with a plurality of elements of the receive waveform alphabet that includes first and second waveform elements that differ therebetween in spectral content in that respective first and second bandwidths thereof differ therebetween and/or respective first and second frequency ranges thereof differ therebetween;

wherein the receive processor is configured to map the waveform sequence {U_j(iT)} into a receive information symbol sequence {I_j}; and

wherein the decoder is configured to decode the information symbol sequence {I_j} thereby forming an output bit sequence.

68. The system according to claim 67, wherein a spectral content of the waveform sequence {U_j(iT)} is distributed over first and second frequency intervals that are separated therebetween by a third frequency interval that is devoid of spectral content associated with the waveform sequence {U_j(iT)}.

69. The system according to claim 67, wherein the waveform sequence {U_j(iT)} includes a variable frequency range whereby third and fourth waveform symbols of the waveform sequence {U_j(iT)} comprise respective third and fourth frequency ranges that differ therebetween.

70. The system according to claim 69, wherein the third and fourth frequency ranges that differ therebetween, are separated therebetween by a range of frequencies that is devoid of providing frequency content to the third and fourth waveform symbols.

71. The system according to claim 67, wherein for a first value of j of the waveform sequence {U_j(iT)}, i=1, 2, . . . , N;

wherein for a second value of j of the waveform sequence {U_j(iT)}, i=1, 2, . . . , M;

wherein the first and second values of j differ therebetween; and

wherein N and M differ therebetween.

72. The system according to claim 71, wherein for the first value of j a duration of a respective first waveform symbol of the waveform sequence {U_j(iT)} comprises a first value NT and wherein for the second value of j the duration of a respective second waveform symbol of the waveform sequence {U_j(iT)} comprises a second value MT that differs from the first value NT.

73. The system according to claim 67, wherein first and second values of j comprise respective first and second successive integer values of j;

and wherein respective first and second waveform symbols of the waveform sequence {U_j(iT)} corresponding to the first and second values of j differ therebetween in spectral content and are received by the receive antenna over respective first and second successive time intervals that are adjacent therebetween and are separated therebetween by one transmit/receive symbol interval.

74. The system according to claim 67, wherein at least one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly responsive to a predetermined statistical distribution.

75. The system according to claim 74, wherein the predetermined statistical distribution comprises a Gaussian distribution.

76. The system according to claim 67, wherein the waveform sequence {U_j(iT)} is devoid of a regularly repeating peak amplitude level.

77. The system according to claim 67, wherein the wireless receiver is devoid of a modulator and/or frequency translator and is configured to receive information by receiving and processing the waveform sequence {U_j(iT)} without subjecting the waveform sequence {U_j(iT)} to a modulator and/or frequency translator.

78. The system according to claim 67, wherein the wireless receiver comprises a modulator and/or frequency translator and is configured to receive information by receiving the waveform sequence {U_j(iT)} and subjecting the waveform sequence {U_j(iT)} to the modulator and/or frequency translator.

79. The system according to claim 67, wherein each one of the first and second waveform elements that differ therebetween in spectral content comprises a waveform that is generated pseudo-randomly;

and wherein the first and second waveform elements that differ therebetween in spectral content are statistically independent and orthogonal therebetween.

80. The system according to claim 67, wherein the correlator is configured to correlate by using a Fourier transform operation.