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On a space time parallel iterative coding scheme and its performance evaluation
Hou, Jia,Lee, Moon Ho John Wiley Sons, Ltd. 2003 WIRELESS COMMUNICATIONS AND MOBILE COMPUTING Vol.3 No.5
<P>This paper proposes a class of space time parallel (STP) iterative coding scheme to combat fading for wireless MIMO systems. In addition to the inner iterations, the super iterations (or outer iterations) and symbol interleaved space time coding are employed to achieve additional time diversity and coding gain in fading channel. The numerical and simulation results demonstrate that the STP iterative coding scheme may make use of all the advantages of transmit diversity and time diversity in wireless MIMO systems. In particular, in the case of STP turbo codes, about 1 dB BER enhancement and half calculation time reduction from conventional space time (ST) turbo codes designs are achieved; in the case of low density parity check (LDPC) codes, about 0.8 dB improvement from conventional ST LDPC designs is obtained. Copyright © 2003 John Wiley & Sons, Ltd.</P>
Butterfly Log-MAP Decoding Algorithm
Hou, Jia,Lee, Moon Ho,Kim, Chang Joo The Korea Institute of Information and Commucation 2004 Journal of communications and networks Vol.6 No.3
In this paper, a butterfly Log-MAP decoding algorithm for turbo code is proposed. Different from the conventional turbo decoder, we derived a generalized formula to calculate the log-likelihood ratio (LLR) and drew a modified butterfly states diagram in 8-states systematic turbo coded system. By comparing the complexity of conventional implementations, the proposed algorithm can efficiently reduce both the computations and work units without bit error ratio (BER) performance degradation.
Enhancing data throughput and lower correlations quasi orthogonal functions for 3G CDMA systems
Hou, Jia,Lee, Moon Ho John Wiley Sons, Ltd. 2006 International journal of communication systems Vol.19 No.8
<P>The forward link of the 3G code-division multiple-access (CDMA) system may become limited under the increasing of the number of users. The conventional channelization code, Walsh code, has not enough sizes for much possible users, therefore, the quasi orthogonal function (QOF), which can process optimal cross-correlation with Walsh code, is considered.</P><P>To obtain lower correlations and better performance in 3G CDMA system, we investigate a quasi orthogonal function on Jacket matrices in this paper. Secondly, to simplify the detector and improve the bit error rate (BER) performance, we provide a novel detection scheme for QOF CDMA system. Finally, we give a brief discussion about a simple recursive generation of the bent sequences for QOF mask function. Copyright © 2005 John Wiley & Sons, Ltd.</P>