Radio communication equipment using algorithm diversity

• US 6,259,721 B1
• Filed: 06/30/1998
• Issued: 07/10/2001
• Est. Priority Date: 11/14/1996
• Status: Expired due to Term

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Uesugi, Mitsuru, Kato, Osamu
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Ha, Dac V.
• Application Number:
  US09/091,836
• Time in Patent Office: 1,106 Days
• Field of Search: 375/130, 375/147, 375/148, 375/347, 375/350, 375/229, 455/132, 455/133, 455/134, 455/135, 455/276.1, 455/277.1, 455/277.2, 370/335, 370/342, 370/441, 370/479
• US Class Current: 375/130
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04L 1/02 by diversity reception

Abstract

The present invention is characterized by that, at a reception section of a base station in a CDMA system including a reception antenna, a radio section and the number of demodulators corresponding to the number of users where spreading codes of a plurality of spreading factors are available, an algorithm diversity controller and a selector are prepared, information concerning spreading factors of spreading codes utilized by users and others are applied to the algorithm diversity controller, algorithm diversity controller instructs the number of demodulators prepared corresponding to the number of users and the selector, and when signals transmitted by a user utilizing a spreading code of a low spreading factor, i.e. signals with high symbol rate, are received, by demodulating signals with different reception methods or different parameters at demodulators leftover because of the low spreading factor, the demodulated signals of the best quality are selected.

Claims

1. A communication apparatus using algorithm diversity comprising:

a plurality of demodulators;

recognizing means for recognizing a status of a used spreading factor of a spreading code; and

control means for controlling at least one demodulator leftover from said plurality of demodulators to demodulate data using a spreading code of relatively low spreading factor on the basis of the status of the used spreading factor.

2. The communication apparatus according to claim 1, wherein the recognizing means decides whether spreading factors of used spreading codes are all same or not.

3. The communication apparatus according to claim 1, wherein in the case where spreading factors of used spreading codes are different, the number of users assigned for a demodulator is decided.

4. The communication apparatus according to claim 1, wherein the control means selects a demodulation method at a leftover demodulator.

5. The communication apparatus according to claim 4, wherein a demodulation result of the best quality among modulation results is selected.

6. A mobile station communicating with the communication apparatus according to claim 1.

7. A communication system comprising:

the communication apparatus according to claim 1 and

a mobile station communicating with said communication apparatus.

8. The communication apparatus according to claim 1, wherein all demodulators of said plurality of demodulators are used in demodulation processing.

9. A communication apparatus using algorithm diversity comprising:

detecting means for detecting the quality of a reception data; and

control means for controlling a leftover demodulator to demodulate data of relatively low quality on the basis of the quality result.

10. The communication apparatus according to claim 9, wherein the control means decides whether the number of demodulators is the same as the number of users or not.

11. A communication system using algorithm diversity, wherein said algorithm diversity comprises:

recognizing status of a used spreading factor of a spreading code; and

controlling at least one demodulator leftover from a plurality of demodulators to demodulate data using a spreading code of relatively low spreading factor on the basis of the status of used spreading factor.

12. The communication system according to claim 11, wherein whether spreading factors of used spreading codes are all same or not is decided.

13. The communication system according to claim 11, wherein in the case where spreading factors of used spreading codes are different, the number of users assigned for a demodulator is decided.

14. The communication system according to claim 11, wherein a demodulation method at a leftover demodulator is selected.

15. The communication system according to claim 14, wherein a modulation result of the best quality among modulation results is selected.

16. The communication system according to claim 11, wherein all demodulators of said plurality of demodulators are used in demodulation processing.

17. A communication system using algorithm diversity, wherein said algorithm diversity comprising the steps of;

detecting the quality of a reception data; and

controlling a leftover demodulator to demodulate data of relatively low quality on the basis of the quality result.

18. The communication system according to claim 17, wherein whether the number of demodulators is the same as the number of users or not is decided.