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The use of error correction coding and diversity has been shown to be very effective against jamming in a fast frequency hopped M-ary !?SI< (FFH/AlFSI<) system. In the system design, it is usually implied that the hop rate is variable to accommodate the optimum design parameters. Unfortunately, systems such as satellite comniuncations may have the hop rate fixed before other system parameters are decided. This paper evaluates the pcrformance of FFHIAI FSK with a fixed hop rate for both uncoded and coded systems. The performance criterion used is a throughput measure, i.e. information rate sustained by a system for a given bit error rate normalized by the hop rate. Codes with superior performance are identified.

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