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Maximum Sum Rate of Repeat-Accumulate Interleave-Division System by Fixed-Point Analysis

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3 Author(s)
Guanghui Song ; Dept. of Intell. Inf. Eng. & Sci., Doshisha Univ., Kyoto, Japan ; Jun Cheng ; Watanabe, Y.

A multi-user repeat-accumulate interleave-division (RAID) system is considered for a multiple-access channel (MAC) with binary inputs, equal-power, and symbol synchronization. In the system, a regular repeat-accumulate (RA) code serially concatenated with block spreading is employed for each user. At the receiver, multi-user message-passing decoding is performed on a single factor graph. Over the MAC with additive white Gaussian noise (AWGN), a fixed point analysis is developed to obtain the optimal code rate and the spreading length that give the maximum sum rate for an arbitrary small decoding error rate.

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Communications, IEEE Transactions on  (Volume:60 ,  Issue: 10 )