Modulation, Coding and Multiple Access

This chapter provides an overview of a range of concepts and techniques related to modulation, coding and multiple access schemes. It focuses on the performance of modulation and coding schemes applicable to mobile satellite service (MSS). Some recent schemes are addressed in detail. Similarly, the treatment of multiple access schemes focuses on their applicability to MSS. All three basic multiple access schemes – frequency division multiple access (FDMA), time division multiple access (TDMA) and code division multiple access (CDMA) – are used in MSS for circuit‐mode transmissions or in packet‐mode where the channel resource is shared such that the channel is sufficiently loaded.