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A Novel Decoding Method for non-binary TCM Codes

Communications and Network 2014年第1期6卷 22-28页

作者： Riyadh A. Al-Hilali Abdulkareem S. Abdallah Raad H. Thaher College of Engineering Al-Mustansiriyah University Baghdad Iraq College of Engineering Al-Mustansiriyah University Baghdad Iraq College of Engineering Basrah University Basrah Iraq

A new non-binary decoding method, which is called Yaletharatalhussein decoding algorithm, is designed and implemented for decoding non-binary convolutional codes which is based on the trellis diagram representing the convolutional encoder. Yaletharatalhussein decoding algorithm outperforms the Viterbi algorithm and other algorithms in its simplicity, very small computational complexity, decoding reliability for high states TCM codes that suitable for Fourth-Generation (4G), decreasing errors with increasing word length, and easy to implement with real-time applications. The proposed Yaletharatalhussein decoding algorithm deals with non-binary error control coding of the convolutional and TCM codes. Convolutional codes differ from block codes in that a block code takes a fixed message length and encodes it, whereas a convolutional code can encode a continuous stream of data, and a hard-decision decoding can easily be realized using the Yaletharatalhussein algorithm. The idea of non-binary codes has been extended for symbols defined over rings of integers, which outperform binary codes with only a small increase in decoding complexity. The simulation results show that the performance of the nonbinary TCM-based Yaletharatalhussein algorithm outperforms the binary and non-binary decoding methods.

关键词： Convolutional Codes Coded Modulation (CM) Trellis Code Modulation (TCM) non-binary Error Correcting Codes Groups Rings of Integers

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A High Spectral Efficient non-binary TCM Scheme-Based Novel Decoding Algorithm for 4G Systems

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Communications and Network 2013年第4期5卷 296-304页

作者： Riyadh A. Al-Hilali Raad H. Thaher Abdulkareem S. Abdallah College of Engineering Al-Mustansiriya University Baghdad Iraq College of Engineering Basrah University Basrah Iraq

This paper deals with the MIMO-OFDM technique that is applied to the fourth generation (4G) of the wireless communication systems, this technique can provide high data rate transmission without increasing transmit power and expanding bandwidth, it can also efficiently use space resources and has a bright future. It presents the channel coding assisted STBC-OFDM systems, and employs the Coded Modulation techniques (CM), since the signal bandwidth available for wireless communications is limited. The proposed system deals with non-binary error control coding of the TCM-aided STBC-OFDM scheme for transmissions over the Rayleigh channel. A new non-binary decoding method, Yaletharatalhussein decoding algorithm, is designed and implemented for decoding non-binary convolutional codes, which is based on the trellis diagram representing the convolutional encoder. Yaletharatalhussein decoding algorithm outperforms the Viterbi algorithm and other algorithms in its simplicity, very small computational complexity, decoding reliability for high states TCM codes that are suitable for Fourth-Generation (4G), decreasing errors with increasing word length, and easy to implement with real-time applications. The simulation results show that the performance of the non-binary TCM-based Yaletharatalhussein decoding algorithm-assisted STBC-OFDM scheme outperforms the binary and non-binary decoding methods.

关键词： Convolutional Codes Trellis Code Modulation(TCM) non-binary Error Correcting Codes Groups Rings of Integers OFDM MIMO MIMO-OFDM STBC

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Reduced Complexity Turbo Multi User Detection for a CDMA System Using M-ary PSK

Reduced Complexity Turbo Multi User Detection for a CDMA Sys...

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2006 10th International Conference on Communication Technology（ICCT 2006）

作者： Behrad Mahboobi Said Nader-Esfahani School of Electrical and Computer Engineering University of TehranTehran Iran

In CDMA systems, turbo multi user detection for multiple access interference cancellation and channel decoding in CDMA systems has an exponentially growing complexity with number of users. In these systems, when bandwidth efficient modulations like M-ary PSK are used another exponential factor that is relates to the levels of modulation prohibitively increases the computational complexity of the receiver. In this paper we have examined a symbol based reduced complexity multi user detector, for coded and un-coded CDMA system, with a performance very near to optimal detector while having extremely low complexity. We have introduced a design formula for the required Hamming distance value for no loss in performance. Simulation results of coded and un-coded CDMA system verify the performance of our reduced complexity detector that we expect.

关键词： Turbo multi user non-binary PSK convulutional code Reduced complexity Hamming distance.

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