Dual-time-sharing high-order QAM symbol error correction network of mix-select cells connected with bit-transfer lines - some numerical experiments

抄録

<p>An error correction network that consists of multi-tone delta-sigma (DS) domain mix-select cells connected each other with bit-transfer lines is proposed. The network functions as a factor graph executing min-max belief propagation algorithm with adders (mixers) and min/max selectors operating on multi-tone DS modulated signals and outputting signals in the same form. The network is used repeatedly q/p times for error correction of all decomposed 2p-QAM sub-symbols of received 2q-QAM symbols, p<q. Then, the network is considered as a time-sharing processor for the error correction of 2q-QAM symbols. Each cell of the network processes all elements of several 2p-dimensional message vectors and passes them to other cells. The one message vector is modulated to one 2p-tone DS modulated sequence and the one cell processes the 2p elements of the vector in turn. Then, each cell is considered as a time-sharing processor of the message vector. The former time-sharing error correction and the latter time-sharing message processing are executed in slow and fast time-scales, respectively. Thus, the network is a dual-scale time-sharing system. The network has two advantages. First, the network can be adopted to adaptive QAM communication. Even if modulation order 2q is changed to 2q′, the same network operates q′/p times with nothing changed. Secondly, elements of a message vector decrease from 2q to (q/p)2p. From results of circuit simulation, it was found that the circulated DS modulation noise in the network did not impair the error correction ability when the bit-transfer lines were long enough.</p>

収録刊行物

参考文献 (18)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ