INTERFERENCE CANCELLATION IN SPREAD SPECTRUM COMMUNICATIONS SYSTEM

摘要

PROBLEM TO BE SOLVED: To improve quality of a received signal without increasing transmission power level in a code division multiple access (CDMA) communications system.

SOLUTION: A transmitter transmits a spread spectrum pilot signal and data signal. Each of the signals has a chip code related with itself. A receiver receives the transmitted pilot signal and the data signal. The received pilot signal is filtered by using the chip codes series for the pilot signal, and weights for elements of the received pilot signal are determined by using an adaptive algorithm. The received data signal is weighted by the determined weights and filtered with the data signal chip code to reproduce the data from the received signal.

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