Signal splitting method for limiting peak power in a CDMA system

• US 6,396,817 B2
• Filed: 08/31/1998
• Issued: 05/28/2002
• Est. Priority Date: 08/31/1998
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. Jr., Lundby, Stein A., Holtzman, Jack M., Terasawa, Daisuke
• Primary Examiner(s): NGO, RICKY QUOC
• Application Number:
  US09/144,408
• Publication Number:
  US 20020015390A1
• Time in Patent Office: 1,366 Days
• Field of Search: 370/335,342,468,310,311-328,329-336,337,344,465 455/127,117,343
• US Class Current: 370/311
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 2201/70706 with means for reducing the peak-to-average power ratio
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets

Abstract

The invention is a method for limiting the peak transmit power in a CDMA communication system. At least one of first and second high transmit power regions are separated into a plurality of high transmit power subregions. The high transmit power subregions of the plurality of high subregions are shifted by time offsets of differing durations to provide a plurality of time offset subregions. First and second low transmit power regions are also provided. At least one of the first and second low transmit power regions is also separated into a plurality of transmit power subregions and the low transmit power subregions are shifted by time offsets of differing time durations. The subregions can be time offset by a predetermined time duration or by a random time duration.

Claims

1. A method for limiting peak transmit power in a wireless communication system, comprising:

separating a transmit waveform into portions;

reordering the portions of the transmit waveform to produce a reodered waveform; and

transmitting the portions reordered.

2. The method for limiting peak transmit power of claim 1 wherein the reordering the sequence of the portions is random recording.

3. The method for limiting peak transmit power of claim 2 wherein the random reordering is performed by continuously generating new portion ordering sequences using a random number generator.

4. The method for limiting peak transmit power of claim 1 wherein at least one of the waveform portions comprises a pilot signal.

5. The method for limiting peak transmit power of claim 1 wherein at least one of the waveform portions comprises a voice signal.

6. The method for limiting peak transmit power of claim 1 wherein at least one of the waveform portions comprises a data signal.

7. A system for limiting peak transmit power in a wireless communication system, comprising:

means for separating a transmit waveform into portions;

means for reordering the portions of the transmit waveform to produce a reodered waveform; and

means for transmitting reordered waveform.

8. The system of claim 7 wherein the means for reordering the sequence of the portions is a means for random reordering.

9. The system of claim 8 wherein the means for random reordering is a random number generator for continuously generating new portion ordering sequences.

10. A method for limiting peak transmit power in a wireless communication system, comprising:

separating a transmit waveform into regions;

separating two or more of the regions into subregions;

interleaving two or more of the subregions with respect to each other to form

an interleaved transmit waveform comprised of interleaved subregions; and

transmitting the interleaved transmit waveform.

11. The method for limiting peak transmit power of claim 10 wherein the interleaved subregions are transmitted in a predetermined order.

12. The method for limiting peak transmit power of claim 10 wherein the interleaved subregions are transmitted in a random order.

13. The method for limiting peak transmit power of claim 10 wherein at least one of the regions comprises a pilot signal.

14. The method for limiting peak transmit power of claim 10 wherein at least one of the regions comprises a voice signal.

15. The method for limiting peak transmit power of claim 10 wherein at least one of the regions comprises a data signal.

16. A system for limiting peak transmit power in a wireless communication system, comprising:

means for separating a transmit waveform into regions;

means for separating two or more of the regions into subregions;

means for interleaving two or more of the subregions with respect to each other to form an interleaved transmit waveform comprised of interleaved subregions; and

means for transmitting the interleaved transmit waveform.

17. The system for limiting peak transmit power of claim 16 wherein the means for transmitting the interleaved transmit waveform comprises a means for transmitting the subregions in a predetermined order.

18. The system for limiting peak transmit power of claim 16 wherein the means for transmitting the interleaved transmit waveform comprises a means for transmitting the subregions in a random order.