Soft-Input Soft-Output SISO Demodulation for Continuous Phase Modulation CPM
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In communication systems, Continuous Phase Modulation (CPM) is a widely used modulation technique that transmits information by altering the signal's phase. One of the key advantages of CPM is its ability to achieve high data transmission rates under limited bandwidth conditions. Soft-Input Soft-Output (SISO) demodulation is an advanced demodulation method that utilizes soft information to improve demodulation performance. The implementation typically involves probabilistic algorithms like the BCJR (Bahl-Cocke-Jelinek-Raviv) algorithm or forward-backward recursion, which calculates log-likelihood ratios (LLRs) for each transmitted symbol. Key functions in the demodulation process include phase state tracking, branch metric computation, and soft-decision generation. By employing SISO demodulation for CPM signals, system reliability and performance can be significantly enhanced through iterative processing and error correction coding techniques.
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