Method and apparatus for transmitting and receiving high speed data using code division multiple access channels

• US 7,675,961 B2
• Filed: 04/10/2006
• Issued: 03/09/2010
• Est. Priority Date: 07/10/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr.
• Primary Examiner(s): Wang; Ted M
• Application Number:
  US11/401,971
• Publication Number:
  US 20060176938A1
• Time in Patent Office: 1,429 Days
• Field of Search: 375/146, 375/135, 375/295, 370/320, 370/441, 455/70, 455/103
• US Class Current: 375/146
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7087 Carrier synchronisation aspects
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/7136 Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence

Abstract

The present invention describes a spread spectrum communication system wherein the frequency of carriers and the code channels of the carriers or both for transmission to a given remote station user vary in time. This provides for a direct sequence spectrum communications system which changes frequency or code channel according to a predetermined pattern. The code channels and frequencies can be determined in accordance with a deterministic function or based upon a subset of the data to be transmitted. A receiver structure is also described for receiving the same.

Claims

1. An apparatus, comprising:

a modulator to modulate received data in accordance with a spread spectrum modulation format;

a scrambler to scramble a subset of information bits in the modulated data; and

at least one upconverter to upconvert the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the selection signal is determined in accordance with the scrambled subset of information bits.

2. The apparatus of claim 1, wherein the frequency is selected in accordance with a pseudorandom sequence.

3. The apparatus of claim 1, further comprising a variable frequency synthesizer coupled to the at least one upconverter to generate the determined frequency.

4. The apparatus of claim 3, further comprising a processor coupled to the variable frequency synthesizer, the processor configured to:

generate the selection signal; and

provide the selection signal to the variable frequency synthesizer.

5. The apparatus of claim 3 wherein the variable frequency synthesizer comprises a direct digital synthesizer.

6. The apparatus of claim 1, wherein the at least one upconverter comprises a plurality of upconverters.

7. The apparatus of claim 6, further comprising a switch configured to select an output from one of the plurality of upconverters in accordance with the selection signal, the selected output comprising the modulated data using the determined frequency.

8. An apparatus, comprising:

a modulator to modulate received data in accordance with a code channel selection signal;

a scrambler to scramble a subset of information bits of the modulated data; and

at least one upconverter to upconvert the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the code channel selection signal is determined in accordance with the scrambled subset of information bits.

9. The apparatus of claim 8, wherein the code channel is selected in accordance with a pseudorandom sequence.

10. The apparatus of claim 8, wherein the received data is modulated using a Walsh symbol generator.

11. The apparatus of claim 8, further comprising a processor configured to receive the scrambled subset of information bits and to generate the code channel selection signal.

12. The apparatus of claim 8, wherein the scrambler is further configured to scramble another subset of information bits of the modulated data, and wherein the selection signal is determined in accordance with the another subset of information bits.

13. The apparatus of claim 8, further comprising a variable frequency synthesizer coupled to the at least one upconverter to generate the determined frequency.

14. An apparatus, comprising:

a scrambler to scramble a first subset of information bits and a second subset of information bits from received data;

a modulator to modulate the received data in accordance with a code channel selection signal that is determined in accordance with the scrambled first subset of information bits; and

at least one upconverter to upconvert the modulated data for transmission at a frequency determined in accordance with a selection signal that is determined in accordance with the scrambled second subset of information bits.

15. A base station comprising:

an antenna;

a modulator configured to modulate data;

a scrambler configured to scramble a subset of information bits in the modulated data; and

at least one upconverter configured to upconvert the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the selection signal is determined in accordance with the scrambled subset of information bits.

16. The base station of claim 15, wherein:

the scrambler is configured to scramble another subset of information bits in the data; and

the modulator is configured to modulate the data using a code channel determined in accordance with the another scrambled subset of information bits.

17. A method, comprising:

modulating received data in accordance with a spread spectrum modulation format;

scrambling a subset of information bits in the modulated data; and

upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the selection signal is determined in accordance with the scrambled subset of information bits.

20. The method of claim 17, wherein the frequency is selected in accordance with a pseudorandom sequence.

21. The method of claim 17, further comprising generating the determined frequency using a variable frequency synthesizer coupled to at least one upconverter.

22. The method of claim 21, further comprising:

generating the selection signal; and

providing the selection signal to the variable frequency synthesizer.

23. The method of claim 21 wherein the variable frequency synthesizer comprises a direct digital synthesizer.

24. The method of claim 17, wherein the upconverting the modulated data for transmission at a frequency determined in accordance with the selection signal further comprises upconverting the modulated data for transmission at a plurality of frequencies determined in accordance with the selection signal.

25. The method of claim 24, further comprising selecting an output from one of the plurality of upconverters in accordance with the selection signal, the selected output comprising the modulated data using the determined frequency.

18. A method, comprising:

modulating received data in accordance with a code channel selection signal;

scrambling a subset of information bits of the modulated data; and

unconverting the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the code channel selection signal is determined in accordance with the scrambled subset of information bits.

26. The method of claim 18, wherein the code channel is selected in accordance with a pseudorandom sequence.

27. The method of claim 18, wherein the received data is modulated using a Walsh symbol generator.

28. The method of claim 18, further comprising receiving the scrambled subset of information bits and generating the code channel selection signal.

29. The method of claim 18, further comprising scrambling another subset of information bits of the modulated data, and determining the selection signal in accordance with the another subset of information bits.

30. The method of claim 18, further comprising generating the determined frequency.

19. A method, comprising:

scrambling a first subset of information bits and a second subset of information bits from received data;

modulating the received data in accordance with a code channel selection signal that is determined in accordance with the scrambled first subset of information bits; and

upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal that is determined in accordance with the scrambled second subset of information bits.

31. An apparatus, comprising:

means for modulating received data in accordance with a spread spectrum modulation format;

means for scrambling a subset of information bits in the modulated data; and

means for upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the selection signal is determined in accordance with the scrambled subset of information bits.

34. The apparatus of claim 31, wherein the frequency is selected in accordance with a pseudorandom sequence.

35. The apparatus of claim 31, further comprising means for generating the determined frequency using a variable frequency synthesizer coupled to at least one upconverter.

36. The apparatus of claim 35, further comprising:

means for generating the selection signal; and

means for providing the selection signal to the variable frequency synthesizer.

37. The apparatus of claim 35 wherein the variable frequency synthesizer comprises a direct digital synthesizer.

38. The apparatus of claim 31, wherein the means for upconverting the modulated data for transmission at a frequency determined in accordance with the selection signal further comprises means for upconverting the modulated data for tranmission at a plurality of frequencies determined in accordance with the selection signal.

39. The apparatus of claim 38, further comprising means for selecting an output from one of the plurality of upconverters in accordance with the selection signal, the selected output comprising the modulated data using the determined frequency.

32. An apparatus, comprising:

means for modulating received data in accordance with a code channel selection signal;

means for scrambling a subset of information bits of the modulated data; and

means for upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal, wherein the code channel selection signal is determined in accordance with the scrambled subset of information bits.

40. The apparatus of claim 32, wherein the code channel is selected in accordance with a pseudorandom sequence.

41. The apparatus of claim 32, wherein the received data is modulated using a Walsh symbol generator.

42. The apparatus of claim 32, further comprising means for receiving the scrambled subset of information bits and generating the code channel selection signal.

43. The apparatus of claim 32, further comprising means for scrambling another subset of information bits of the modulated data, and determining the selection signal in accordance with the another subset of information bits.

44. The apparatus of claim 32, further comprising means for generating the determined frequency.

33. An apparatus, comprising:

means for scrambling a first subset of information bits and a second subset of information bits from received data;

means for modulating the received data in accordance with a code channel selection signal that is determined in accordance with the scrambled first subset of information bits; and

means for upconverting the modulated data for transmission at a frequency determined in accordance with a selection signal that is determined in accordance with the scrambled second subset of information bits.