The satellite applications of amplitude companded single sideband modulation

Amplitude Companded Single Sideband or ACSB is a voice processing technique that was originally developed at Stanford University for mobile radio. Previous studies on ACSB for mobile radio have shown a substantial subjective voice improvement for good receive carrier-to-noise ratios. These results for mobile radio indicate that the power and noise figures available on satellite links are sufficient to use ACSB modulation. Single sideband modulation is much more spectrally efficient than currently used modulation techniques and increased channel availability was projected. This study demonstrated that ACSB can be used on satellite links and that its use makes possible an order of magnitude increase in telephone channel availability on existing links. Computer simulation was used to model the ACSB processing to optimize the processing sequence for satellite use and predict performance for voice and voiceband data signals.