Sub-banded ultra-wideband communications system

• US 20040047285A1
• Filed: 09/11/2002
• Published: 03/11/2004
• Est. Priority Date: 09/11/2002
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Ho, Minnie, Foerster, Jeffrey R., Somayazulu, V. Srinivasa, Tinsley, Keith R.
• Granted Patent: US 7,532,564 B2
• Time in Patent Office: Days
• US Class Current: 370/210
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/7163 using impulse radio
• CPC Class Codes: H04B 1/71632 Signal aspects H04B1/7172 and H04B1/7176 take precedence
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems

Abstract

A sub-banded ultra-wideband (SB-UWB) system may combine aspects of an orthogonal frequency division multiplexing (OFDM) modulation scheme with aspects of an ultra-wideband system. In one embodiment, the system may use orthogonal waveforms to form an ultra-wideband wireless communications system. In another embodiment, an FFT based implementation of the system may be used to generate and detect an SB-UWB waveform.

Claims

1. An apparatus, comprising:

a transceiver including a transmitter to generate a sub-banded ultra-wideband waveform, and including a receiver to detect a sub-banded ultra-wideband waveform.

2. The apparatus of claim 1, said transmitter to utilize a fast-Fourier transform structure to generate the sub-banded ultra-wideband waveform.

3. The apparatus of claim 1, said receiver to utilize a fast-Fourier transform structure to detect the sub-banded ultra-wideband waveform.

4. The apparatus of claim 1, said transmitter to utilize a multiple-gated, phased-carrier structure to generate the sub-banded ultra-wideband waveform.

5. The apparatus of claim 1, said receiver to utilize a multiple-gated, phased-carrier structure to detect the sub-banded ultra-wideband waveform.

6. The apparatus of claim 1, said transmitter to utilize a switched-filter structure to generate the sub-banded ultra-wideband waveform.

7. The apparatus of claim 1, said receiver to utilize a switched-filter structure to detect the sub-banded ultra-wideband waveform.

8. The apparatus of claim 1, said receiver adapted to use a direct down-conversion, zero IF structure with a variable, gated mixing frequency matched to a transmitted sub-band sequence.

9. The apparatus of claim 1, said receiver to utilize a sub-sampling structure to detect a sub-banded ultra-wideband waveform.

10. The apparatus as claimed in claim 1, wherein the receiver is adapted to detect a sub-banded ultra-wideband waveform including sub-band waveforms separated in time and frequency.

11. The apparatus as claimed in claim 1, wherein the transceiver is adapted to utilize time-hopping on sub-bands of the sub-banded ultra-wideband waveform.

12. The apparatus as claimed in claim 1, wherein the transceiver is adapted to utilize direct sequence spreading on sub-bands the sub-banded ultra-wideband waveform.

13. The apparatus as claimed in claim 1, wherein the transceiver is adapted to utilize frequency-shift keying on sub-bands on the sub-banded ultra-wideband waveform.

14. The apparatus as claimed in claim 1, wherein the transceiver is adapted to utilize frequency hopping on sub-bands on the sub-banded ultra-wideband waveform.

15. A method, comprising:

transmitting a sub-banded ultra-wideband waveform; and

receiving a sub-banded ultra-wideband waveform.

16. The method of claim 15, said transmitting including utilizing a fast-Fourier transform structure to generate a sub-banded ultra-wideband waveform.

17. The method of claim 15, said transmitting including utilizing a multiple-gated, phased-carrier structure to generate a sub-banded ultra-wideband waveform.

18. The method of claim 15, said transmitting including utilizing a switched-filter structure to generate a sub-banded ultra-wideband waveform.

19. The method of claim 15, said transmitting including utilizing a direct down-conversion, zero IF structure with a variable, gated mixing frequency matched to the transmitted sub-band sequence.

20. The method of claim 15, said receiving including utilizing a fast-Fourier transform structure to detect a sub-banded ultra-wideband waveform.

21. The method of claim 15, said receiving including utilizing a multiple-gated, phased-carrier structure to detect a sub-banded ultra-wideband waveform.

22. The method of claim 15, said receiving including utilizing a switched-filter structure to detect a sub-banded ultra-wideband waveform.

23. The method of claim 15, said receiving including utilizing a sub-sampling structure to detect a sub-banded ultra-wideband waveform.

24. The method of claim 15, further comprising separating sub-bands of the sub-banded ultra-wideband waveform in time and frequency.

25. The method of claims 15, further comprising time-hopping on sub-bands of the sub-banded ultra-wideband waveform.

26. The method of claim 15, further comprising direct sequence spreading on sub-bands of the sub-banded ultra-wideband waveform

27. The method of claim 15, further comprising frequency-shift-keying on sub-bands of the sub-banded ultra-wideband waveform.

28. The method of claim 15, further comprising frequency-hopping on sub-bands of the sub-banded ultra-wideband waveform.

29. An apparatus, comprising:

a fast Fourier transform transceiver to generate and to detect a sub-banded ultra-wideband waveform; and

said fast Fourier transform transceiver includes a data encoder to select one of the sub-bands of the sub-banded ultra-wideband waveform.

30. The apparatus of claim 29, said fast Fourier transform transceiver adapted to utilize the sub-banded ultra-wideband waveform comprising a waveform selected from the group consisting essentially of an orthogonal frequency division multiplexing waveform, a chirped waveform, a frequency shift keying waveform, and a frequency hopping waveform.

31. An apparatus, comprising:

a multiple gated, phased carrier transceiver to generate and to detect a sub-banded ultra-wideband waveform; and

said multiple gated, phased carrier transceiver includes at least one element selected from the group consisting essentially of matched filters and correlators, for the sub-bands of the sub-banded ultra-wideband waveform.

32. The apparatus of claim 31, the sub-banded ultra-wideband waveform comprising a waveform selected from the group consisting essentially of a phase shift keying waveform and a quaternary phase shift keying waveform.

33. An apparatus, comprising:

a switched filter transceiver to generate and to detect a sub-banded ultra-wideband waveform; and

said switched filter transceiver includes an up-converter to convert sub-bands of the sub-banded ultra-wideband waveform from an intermediate-frequency to a desired radio-frequency.

34. The apparatus of claim 33, said switched filter to operate at a pulse repetition rate that is a function of a desired data rate.

35. An apparatus, comprising:

a sub-sampling transceiver to detect a sub-banded ultra-wideband waveform; and

said sub-sampling transceiver includes at least one analog-to-digital converter to sample a radio-frequency signal or a low-intermediate-frequency signal.

36. The apparatus of claim 35, wherein said sub-sampling transceiver includes at least two analog-to-digital converters to sample I and Q signals separately.

37. The apparatus of claim 35, said sub-sampling transceiver adapted to down-convert at least one sub-band of the sub-banded ultra-wideband waveform to a zero intermediate-frequency.

38. The apparatus of claim 35, said sub-sampling transceiver adapted to down-convert at least one sub-band of the sub-banded ultra-wideband waveform to a very low intermediate-frequency equal to a value approximately more than half of a bandwidth of a sub-banded channel.