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Abstract

Spread spectrum communication system comprising a transmitter for transmitting data in bit form from one location to a remote location. An encoder is provided for encoding the data with a chip sequence at a predetermined clock rate to provide encoded data which is transmitted to the remote location. A receiver is provided at the remote location for receiving the encoded data. The receiver includes a correlator having a shift register for storing a chip sequence on the encoded data in bit form at least three sequential times. A decoder is provided for polling the shift register during the three sequential times of the stored chip sequence in bit form at a clock rate of at least three times that of the clock rate of the chip sequence to ascertain whether a majority of the corresponding chips of the chip sequence stored in the shift register at the at least three sequential times are the same to provide an output. A comparator is provided for comparing the output with the corresponding chip of the transmitted chip sequence to ascertain whether they are the same and with an inverted chip corresponding to the chip of the transmitted chip sequence to ascertain whether they are the same to provide compared data. A summer is provided for summing the compared data to provide summed data, and an adjustable threshold is provided for determining when the summed data constitutes a valid data bit.

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First Claim