Advantages of orthogonal hopped waveforms in a hardlimited SHF satellite transponder

Spread-spectrum multiple access (SSMA) and electronic counter-counter measures (ECCM) are techniques used by many military satellite communications systems to allow simultaneous operation of multiple antijam waveforms in a single transponder. The maximum achievable data throughput is determined for the orthogonal and nonorthogonal cases, and the ratio of these two throughputs is obtained. This ratio predicts that orthogonal hopping will result in a large performance advantage relative to the nonorthogonally hopped case for a large fraction of transponder input power made up of signals as opposed to jammer. Conversely, as the jammer power is increased, a smaller advantage is predicted for a smaller fraction of transponder input power comprised of signals.<>