用於空時籬柵碼的非同調重複解碼演算法

Noncoherent Iterative Decoding Algorithm For Space-Time Trellis Codes

翁健家(Jian-Jia Weng)

指導教授 ： 魏瑞益

國立中央大學/資訊電機學院/通訊工程學系/碩士(2006年)

摘要

在空時碼的系統中，除了么正空時調變(unitary space-time modulation, USTM) [12]與相差空時調變(differential space-time modulation, DSTM)[13]外，大部分的空時碼都要在通道狀態已知的情況下進行解碼。在[14]中提出了一種適用於無線衰退通道環境下，具有訓練符元(training symbols)之非同調空時區塊碼傳輸架構，此架構的解碼器藉由通道係數的估測值作同調解碼。在此篇論文中，我們針對使用超級正交空時籬柵碼(super-orthogonal space-time trellis codes, SOSTTCs)[10]及其他空時籬柵碼[7]的這種架構，提出一種基於決策回授方式的非同調重複解碼演算法，使能以低複雜度趨近最大可能性(maximum likelihood, ML)非同調解碼的錯誤效能。

關鍵字

近似穩態衰退通道 ； 訓練碼 ； 通道估測 ； 非同調檢測 ； 空時碼 ； 空時籬柵碼 ； 超級正交空時籬柵碼

並列摘要

Most of the space-time codes have to decode with channel state information except for Unitary Space-Time Modulation(USTM)[12] and Differential Space-Time Modulation(DSTM)[13] system. A noncoherent space-time block code transmission scheme with training symbols, which applies the estimated channel coefficients to perform coherent decoding, was proposed in [14] to work under wireless fading channels. In this thesis, we present a noncoherent iterative decoding algorithm in decision-feedback fashion under the framework of Super-Orthogonal Space-Time Trellis Codes(SOTTCs)[10] and some space-time trellis codes[7] to approach the error performance of a Maximum Likelihood(ML) noncoherent decoder with low complexity.

並列關鍵字

space-time trellis codes ； space-time codes ； channel estimation ； training codes ； quasi-static fading channel ； noncoherent detection ； super-orthogonal space-time trellis codes

參考文獻

【1】 G. J. Foschini and M. J. Gans, “On limits of wireless communications in a fading environment when using multiple antennas,” Wireless Personal Communications, vol. 6, 1998, pp. 311-335

【2】 E. Telatar, “Capacity of multi-antenna Gaussian channels,” European Transactions on Telecommunications, vol. 10, no. 6, Nov./Dec. 1999, pp. 585-595.

【3】 V. Tarokh, N. Seshadri and A. R. Calderbank, “Space-time codes for high data rate wireless communication: Performance criterion and code construction,” IEEE Trans. Inform. Theory, vol. 44, pp. 744-765, Mar. 1998.

【4】 S. M. Alamouti, “A simple transmitter diversity scheme for wireless communications,” IEEE Journal Select. Areas Commun., vol. 16, pp. 1451-1458, Oct. 1999.

【5】 V. Tarokh, H. Jafarkhani and A. R. Calderbank, “Space-time block codes from orthogonal designs,” IEEE Trans. Inform. Theory, vol. 45, pp. 1456-1467, July 1999.