The present invention relates to a decoder for use in a spread spectrum radio receiver which is capable of directly demodulating an L- length frequency-hopped, Q-level frequency shift keyed radio-frequency received signal into a baseband signal wherein a desired user's message signal is decoded into a sequence of tone bursts at a fixed frequency over each L-length sequence. Spectral analysis is performed on the resultant baseband signal either during each chip interval or once at the end of each L-length sequence to permit subsequent detection of a desired user's correct received message signal.
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