IMPROVED SIGNAL DETECTION IN A DIRECT-SEQUENCE SPREAD SPECTRUM TRANSMISSION SYSTEM

摘要

A receiver (10) achieves more reliable detection of signals transmitted by Direct Sequence Spread Spectrum Transmission by correlating the signals with N symbol patterns via N detector stages (181-18N). A maximum peak power detecting mechanism (241-24N, 261-26N and 28) detects which of the N correlated symbol patterns has a maximum peak power, as well as the identity of each of the N patterns actually received and an index of the peak power in each symbol. A computing mechanism (30, 32 and 34) computes a running power average of the received signals, while a computing stage (36) computes the ratio of the largest peak power of the N correlated symbol patterns to the running power average. A comparator (38) compares the ratio to a threshold value (40) to determine a first symbol in the received pattern.