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In this paper capacity-achieving low-density parity-check (LDPC) codes is applied to IDMA System, called as, LDPC-Coded IDMA system, in which the associated coding- spreading tradeoff problem is mainly investigated. We quest the required minimum SNR for reliable data and voice transmission based on the bit error rate (BER) level of 10" and 10"3 over AWGN channel under different code rates...
The addition and taking the maximum (max) operations, as well as all the quantized data involved in the max-log-MAP turbo decoding algorithm form a commutative max-sum semiring. In this paper performance degradation of turbo decoding caused by shift operations using fixed-point data representation and unified precision bits is solved when the distributive law is properly applied to this semiring,...
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