A selective call communication system (10) transmits a frequency hopped spread spectrum signal as a Reed Solomon code word modulated as a four-level frequency shift keying (4FSK) signal. A base site transceiver (150) receives the signal on a plurality of narrow band channels and a DSP (152)...http://www.google.de/patents/US5832026?utm_source=gb-gplus-sharePatent US5832026 - Method for correcting errors from a fading signal in a frequency hopped spread spectrum communcation system 
