Communication device with code sequence and frequency selection

Details Communication device with code sequence and frequency selection Communication device with code sequence and frequency selection

1993-03-03

1994-05-31

Swann, Tod R.

Pulse or digital communications

Repeaters

Testing

380 34, H04K 100

Patent

active

053175930

ABSTRACT:
A code division multiple access (CDMA) communication system (10) for reuse of available spreading codes includes a first communication device (100) and a second communication device (106). The first and second communication devices (100, 106) are capable of identifying spreading codes and operating frequencies that are optimum for their respective radios. The identity of the optimum spreading code and the frequency of the optimum frequency is communicated from one communication device (100) to another (106), hence allowing the two devices to communicate with each other using their respective optimum codes and frequencies. These codes and frequencies may be periodically updated to provide reusability of codes. By dynamically updating codes and frequencies without the use of a central station, the efficiency and reusability of codes in the CDMA system (10) is significantly enhanced.

REFERENCES:
patent: 4979183 (1990-12-01), Cowart
patent: 5029180 (1991-07-01), Cowart
patent: 5210771 (1993-05-01), Schaeffer et al.
patent: 5237587 (1993-08-01), Schoolcraft
Theory of Spread-Spectrum Communication by Raymond L. Pickholtz, Donald L. Schilling, and Laurence B. Milstein, published in IEEE Transaction on Communication, vol. Com-30, No. 5, May 1982.
Crosscorrelation Properties of Pseudorandom and Related Sequences, by Dilip V. Sarwate and Michael B. Pursley, published in Proceedings of the IEEE, vol. 68, No. 5, May 1980.

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