Systems and methods for transmitting data in a wireless communication network

• US 7,352,806 B2
• Filed: 03/26/2004
• Issued: 04/01/2008
• Est. Priority Date: 12/06/2001
• Status: Active Grant

• Current Assignee: Intellectual Ventures Holding 81 LLC (Intellectual Ventures LLC)
• Original Assignee: Tensorcom Inc
• Inventors: Lakkis, Ismail
• Primary Examiner(s): Tran, Khai
• Application Number:
  US10/811,223
• Publication Number:
  US 20050157782A1
• Time in Patent Office: 1,467 Days
• Field of Search: 327/172, 327/333, 327/291, 327/299, 375/237, 375/260
• US Class Current: 375/237
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0059 Convolutional codes
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems

Abstract

A method of communicating over a wideband communication channel divided into a plurality of sub-channels comprises dividing a single serial message intended for one of the plurality of communication devices into a plurality of parallel messages, encoding each of the plurality of parallel messages onto at least some of the plurality of sub-channels, and transmitting the encoded plurality of parallel messages to the communication device over the wideband communication channel.

Claims

1. A radio transmitter module configured to generate a modulated signal having a three-level signal constellation from a data stream comprising a plurality of symbols, each symbol having one of three symbol values, the transmitter, comprising:

a first pulser configured for generating a high signal for each of the plurality of symbols having a first symbol value and a low signal for each of the plurality of symbols having a second symbol value or a third symbol value;

a second pulser configured for generating a high signal for each of the plurality of symbols having the third symbol value and a low signal for each of the plurality of symbols having the second symbol value or the first symbol value, the second pulser further comprising an inverted output; and

a combiner coupled to the first pulser and the second pulser for combining pulsed signal outputs to generate the modulated signal.

2. The radio transmitter module of claim 1, wherein the three symbol values comprise “

1”

, “

0”

, and “

−

1”

.

3. The radio transmitter module of claim 1, further comprising a pulse-shaping filter for filtering the pulsed signal outputs.

4. The radio transmitter module of claim 1, wherein the combiner is configured to combine the pulsed signal outputs by subtracting signals generated by the second pulser from signals generated by the first pulser.

5. The radio transmitter module of claim 1, wherein the modulated signal produced by the first pulser, the second pulser, and the combiner comprises an in-phase signal, the radio transmitter further comprising:

a third pulser configured for generating a high signal for each of a plurality of input symbols having the first symbol value and a low signal for each of the plurality of input symbols having the second symbol value or the third symbol value;

a fourth pulser configured for generating a high signal for each of the plurality of input symbols having the third symbol value and a low signal for each of the plurality of input symbols having the second symbol value or the first symbol value, the second pulser further comprising an inverted output;

combiner coupled to the third pulser and the fourth pulser, the combiner configured to combine pulsed outputs generated by the third pulser and the fourth pulser for producing a quadrature-phase signal.

6. The radio transmitter module of claim 5, wherein the three symbol values comprise “

1”

, “

0”

, and “

−

1”

.

7. The radio transmitter module of claim 5, further comprising a pulse-shaping filter configured for filtering at least one of a set of signals, the set comprising the pulsed outputs, the in-phase signal, and the quadrature-phase signal.

8. The radio transmitter module of claim 1, wherein the combiner is configured to combine the pulsed signal outputs by subtracting signals generated by the fourth pulser from signals generated by the fourth pulser.

9. The radio transmitter module of claim 5, further comprising an adder configured to combine the in-phase signal with the quadrature-phase signal.

10. The radio transmitter module of claim 5, further configured for encoding the in-phase signal onto a first waveform and encoding the quadrature-phase signal onto a second waveform, the first waveform being orthogonal to the second waveform.

11. The radio transmitter module of claim 1, wherein each of the first pulser and the second pulser comprises an AND gate and a delay module.

12. The radio transmitter module of claim 11, wherein the output of the AND gate associated with the second pulser is inverted.

13. The radio transmitter module of claim 5, wherein each of the third pulser and the fourth pulser comprises an AND gate and a delay module.

14. The radio transmitter module of claim 13, wherein the output of the AND gate associated with the fourth pulser is inverted.

15. The radio transmitter module of claim 1, wherein each of the first pulser and the second pulser comprises an edge detector.

16. The radio transmitter module of claim 5, wherein each of the third pulser and the fourth pulser comprises an edge detector.

17. The radio transmitter module of claim 5, wherein the combiner comprises at least one passive combiner.

18. The radio transmitter module of claim 5, wherein the combiner comprises at least one active combiner.

19. A transmitter configured for receiving a data stream from a baseband circuit and generating a modulated signal having a three-level signal constellation, the transmitter comprising:

a first pulser configured for generating a high signal for each of the plurality of symbols having a first symbol value and a low signal for each of the plurality of symbols having a second symbol value or a third symbol value;

a second pulser configured for generating a high signal for each of the plurality of symbols having the third symbol value and a low signal for each of the plurality of symbols having the second symbol value or the first symbol value; and

a first combiner coupled to the first pulser and the second pulser for subtracting a pulsed signal output of the second pulser from a pulsed signal output of the first pulser to generate the modulated signal.

20. The transmitter of claim 19, wherein the three symbol values comprise “

1”

, “

0”

, and “

−

1”

.

21. The transmitter of claim 19, further comprising a pulse-shaping filter for filtering the pulsed signal outputs.

22. The transmitter of claim 19, wherein the second pulser further comprises an inverted output for generating an inverted pulsed output, the first combiner configured to sum the pulsed signal output generated by the first pulser with the inverted pulsed output generated by the second pulser.

23. The transmitter of claim 19 wherein the modulated signal produced by the first pulser, the second pulser, and the first combiner comprises an in-phase signal, the radio transmitter further comprising:

a third pulser configured for generating a high signal for each of a plurality of input symbols having the first symbol value and a low signal for each of the plurality of input symbols having the second symbol value or the third symbol value;

a fourth pulser configured for generating a high signal for each of the plurality of input symbols having the third symbol value and a low signal for each of the plurality of input symbols having the second symbol value or the first symbol value; and

a second combiner coupled to the third pulser and the fourth pulser, the second combiner configured to subtract a pulsed output generated by the fourth pulser from a pulsed output generated by the third pulser for producing a quadrature-phase signal.

24. The transmitter of claim 23, wherein the three symbol values comprise “

1”

, “

0”

, and “

−

1”

.

25. The transmitter module of claim 23, further comprising a pulse-shaping filter configured for filtering at least one of a set of signals, the set comprising the pulsed outputs, the in-phase signal, and the quadrature-phase signal.

26. The transmitter of claim 23, wherein the fourth pulser further comprises an inverted output for generating an inverted pulsed output, the second combiner configured to sum the pulsed output generated by the third pulser with the inverted pulsed output generated by the fourth pulser.

27. The transmitter of claim 23, further comprises an adder configured to combine the in-phase signal with the quadrature-phase signal.

28. The transmitter of claim 23, further configured for encoding the in-phase signal onto a first waveform and encoding the quadrature-phase signal onto a second waveform, the first waveform being orthogonal to the second waveform.

29. The transmitter of claim 19, wherein each of the first pulser and the second pulser comprises an AND gate and a delay module.

30. The transmitter of claim 29, wherein the output of the AND gate associated with the second pulser is inverted.

31. The transmitter of claim 23, wherein each of the third pulser and the fourth pulser comprises an AND gate and a delay module.

32. The transmitter of claim 23, wherein the output of the AND gate associated with the fourth pulser is inverted.

33. The transmitter of claim 19, wherein each of the first pulser and the second pulser comprises an edge detector.

34. The transmitter of claim 23, wherein each of the third pulser and the fourth pulser comprises an edge detector.

35. The transmitter of claim 23, wherein the first combiner and the second combiner comprise passive combiners.

36. The transmitter of claim 23, wherein the third combiner and the fourth combiner comprise active combiners.

37. A method of transmitting data in a wireless communication network, comprising:

generating a high signal for each of the plurality of symbols having a first symbol value and a low signal for each of the plurality of symbols having a second symbol value or a third symbol value for producing a first pulsed signal output;

generating a high signal for each of the plurality of symbols having the third symbol value and a low signal for each of the plurality of symbols having the second symbol value or the first symbol value for producing a second pulsed signal output; and

combining the first pulsed signal output with an inverted version of the second pulsed signal output to generate at least one combined waveform having a three-level signal constellation.

38. The method of claim 37, further comprising pulse shaping the at least one combined waveform.

39. The method of claim 37, wherein generating the high signal for each of the plurality of symbols having the first symbol value and the low signal for each of the plurality of symbols having the second symbol value or the third symbol value for producing the first pulsed signal output;

and generating the high signal for each of the plurality of symbols having the third symbol value and the low signal for each of the plurality of symbols having the second symbol value or the first symbol value for producing the second pulsed signal output comprises ANDing each of a plurality of data streams with a delayed version of itself.

40. The method of claim 37, wherein generating the high signal for each of the plurality of symbols having the first symbol value and the low signal for each of the plurality of symbols having the second symbol value or the third symbol value for producing the first pulsed signal output;

and generating the high signal for each of the plurality of symbols having the third symbol value and the low signal for each of the plurality of symbols having the second symbol value or the first symbol value for producing the second pulsed signal output comprises performing edge detection.