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On schemes of decision with soft output for dual $$M$$-ary orthogonal spread spectrum system. (Chinese. English summary) Zbl 1097.94032
Summary: This paper presented a novel decision scheme with soft output for SISO decoding when noncoherent receiver for dual $$M$$-ray orthogonal spreading symbols is employed. Compared with the optimal ML decision scheme, it can reduce the complexity of computation remarkably. More improvements on calculation speed can be achieved by shortening the searching space. The simulation results over both AWGN and multipath Rayleigh fading channels show that the BER performance of the new scheme is close to that of the optimal one.
##### MSC:
 94B35 Decoding 94A40 Channel models (including quantum) in information and communication theory 94A11 Application of orthogonal and other special functions