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標題: Analysis and architecture design of a downlink M-modification MC-CDMA system using the Tomlinson-Harashima precoding technique
作者: Lin, K.H.
Chen-Hao, R.
Lin, H.L.
Wu, C.F.
關鍵字: minimum mean-square error (MMSE);multicarrier code division multiple;access (MC-CDMA);precoding;Tomlinson - Harashima precoding (THP);zero;forcing (ZF);multicarrier cdma;performance
Project: Ieee Transactions on Vehicular Technology
期刊/報告no:: Ieee Transactions on Vehicular Technology, Volume 57, Issue 3, Page(s) 1387-1397.
This paper investigates the feasibility of applying Tomlinson - Harashima precoding (THP) to multicarrier code-division multiple-access (MC-CDMA) system downlinks, in which multiple-access interference and possible complexity in the mobile terminal (MT) are major burdens. A THP based on the minimum mean-square error (MMSE) criterion is also presented, making it possible to realize a low-complexity receiver at the MT. The hardware architecture of the MMSE THP with modified QR decomposition at the transmitter is presented, along with the required word length analyzed. Pipeline and parallel schemes are adopted to reduce the execution time. For a generic square matrix of order n for RQ decomposition, the required latency is 2n - 1 time units, which is based on the modified Gram - Schmidt algorithm.
ISSN: 0018-9545
DOI: 10.1109/tvt.2007.909251
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