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This letter is concerned with the soft-input soft-output (SISO) demodulation of M-ary (M = 2r) orthogonal modulation. We prove that the SISO orthogonal demodulation (SISO-OD) is equivalent to the SISO decoding of orthogonal Hadamard codes, for which we deduct a posteriori probability fast Hadamard transform (APP-FHT) algorithm. With FHT and the proposed APP-FHT, the demodulation complexity can be...
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