Abstract
AbstractRecently, there has been increased interest in coded octal phase‐shift keying (8PSK) modulation for satellite communications, in which convolutional encoding and Viterbi decoding are combined with 8PSK modulation and demodulation. The problem in this paper is how to simplify the process of metric calculation in a Viterbi decoder and realize reduced hardware complexity and increased operating speed of a coded 8PSK modem. An analytical expression is introduced for the performance of a coded 8PSK model with such a simplified Viterbi decoder. The expression is then applied to a typical coded 8PSK modem employing the Ungerboeck code of rate 2/3 and with constraint length ν=2. Effects of simplifications in the Viterbi decoder on the bit error rate (BER) performance of the model have been evaluated. Results in this paper would be useful in the design of future coded PSK modems, since it enables a designer to assess the tradeoffs involved in the simplifications and to realize modems with reduced hardware complexity for highspeed applications.
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