Performance of Turbo-Coded 16QAM over AWGN Channel
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Turbo-coded 16QAM demonstrates outstanding performance in AWGN channels. The implementation employs constituent codes with generator polynomials [1, 17/15], achieving a code rate of 1/2 through parallel concatenation of two recursive systematic convolutional (RSC) encoders. This configuration enables effective error correction during transmission by leveraging the iterative decoding algorithm (typically Log-MAP or Max-Log-MAP) that exchanges soft information between component decoders. The system incorporates a random interleaver, which scrambles the data sequence between encoders to break up error patterns and enhance the coding gain through diversity. These optimization techniques enable turbo-coded 16QAM to deliver more reliable and stable transmission performance in channel communications, significantly improving signal quality by reducing the bit error rate (BER) across various SNR conditions.
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