Joint multiuser detection and decoding in coded MC-CDMA system : a study on quasi-maximum-likelihood decoding using ordered statistics algorithm

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  • 誤り訂正符号化MC-CDMAにおけるマルチユーザ検出と誤り訂正復号の一体化処理方式 : 順序統計量アルゴリズムを用いた準最尤復号法の検討
  • アヤマリ テイセイ フゴウカ MC-CDMA ニオケル マルチ ユーザ ケンシュツ ト アヤマリ テイセイ フクゴウ ノ イッタイカ ショリ ホウシキ : ジュンジョ トウケイリョウ アルゴリズム オ モチイタ ジュンサイユウ フクゴウホウ ノ ケントウ

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Abstract

In multi-carrier code division multiple access (MC-CDMA) systems, delay waves cause inter-code interference and degrade bit error rate (BER) performance as the number of multiplexing users increases. In this paper, we propose a new quasi-maximum likelihood detection which jointly performs multiuser detection and error correction decoding for coded MC-CDMA systems to mitigate the inter-code interference. The proposed method uses codewords generated by the ordered statistics decoding for the quasi-maximum likelihood detection. In the proposed method, we only consider the codewords which have relatively high reliability values, where the reliability values are calculated from received signals, so that we can significantly decrease the number of codewords considered in the quasi-maximum likelihood detection. As the result of numerical simulations, we show that the proposed method exhibits better BER performance than a conventional method.

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