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2006 the IET International Conference on Wireless Mobile & multimedia Networks

作者： Xiaobin Li College of Information Engineering Shenzhen University Shenzhen Guangdong 518060 P. R. China

＜正＞Arming at the problem of multi-user interference existing in optical code division multiple access （CDMA） system, a novel scheme of suppressing multi-user interference in optical CDMA is presented. It can avoid the case no optical pulse existing while bit 0 is transmitted by adopting a spread spectrum code and its shift as address codes of bit 0 and bit 1, respectively, peak value decision instead of threshold decision is used in receiver to further reduce multi-user interference. The fundamental of it is set forth, optimal optical orthogonal codes are applied as address codes;bit error probability of novel system is derived and analyzed with APD as photo detector. Simulations based on the expression are done. The results show that bit error performance of the novel system can be several orders better than that of conventional system.

关键词： optical fiber communication code division multiple address (CDMA) multi-user interference optical orthogonal codes

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Method of interference cancellation based on space-time code in MIMO interference channels

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The Journal of China Universities of Posts and Telecommunications 2015年第1期22卷 1-5页

作者： Tian Xinji Lu Jing School of Computer Science and Technology Henan Polytechnic University

The authors in this article investigated how to cancel multi-user interference with low feedback amount over 3-user multiple input multiple output （MIMO） interference channel using space-time code and precoders. Space-time block code with coding rate 2 was designed, also zero vectors were introduced into each codeword. The multi-user interference is mitigated by pre-coding at the transmitters and nonlinear operation and unidirectional cooperation link at the receivers. Compared with the existing scheme for the same scene, the proposed scheme greatly reduces feedback amount and improves the sum degrees of freedom （DOF）. Simulation demonstrates the validity of the proposed scheme.

关键词： MIMO interference channel space-time code pre-coding multi-user interference feedback amount DOF

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From frequency domain to time domain:performance analysis on cyclic prefixed multi-user single-carrier transmission

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Science China(Information Sciences) 2016年第8期59卷 144-152页

作者： Wei PENG Qing F.ZHOU An HUANG Shaodan MA School of Electronics Information and Communications Huazhong University of Science and Technology School of Computer and Information Hefei University of Technology Faculty of Science and Technology University of Macau

This paper analyzes the performance of cyclic prefixed single-carrier transmission under multiuser interference(MUI). For multi-user receivers using single carrier frequency domain adaptive antenna array,we derive the signal to interference plus noise ratio by analyzing the time domain estimated signal after the transformation from frequency domain to time domain. By assuming the MUI follows the Gaussian distribution,we can derive the analytical expression for the bit error rate(BER) performance. The analytical result is verified by the numerical results generated by Monte Carlo method. It is concluded from the analytical results that if the number of receive antennas goes to infinity as assumed in massive multiple input multiple output(MIMO)system, the BER performance will be determined by two ratios: signal to noise ratio as well as the Nr to U ratio, where Nr is the number of receive antennas and U is the number of users.

关键词： single-carrier transmission multi-user interference frequency domain processing MIMO SCFDAAA

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Improved space-time processing for X channel using precoders

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The Journal of China Universities of Posts and Telecommunications 2014年第5期21卷 31-36页

作者： TIAN Xin-ji LI Ya School of Computer Science and Technology Henan Polytechnic University

The article investigates how to send perfect space-time codes with low feedback amount and symbol-by-symbol decoding for X channel using precoders. It is assumed that two users are introduced with two antennas and two receivers. Each user employs a rate-2 space-time block code and follows certain rule when sending codewords. The multi-user interference is eliminated by pre-coding at the transmitter and linear processing at the receiver. Compared with the existing scheme for the same scene, the proposed scheme greatly reduces feedback amount and improves the transmission efficiency, while keeping the same decoding complexity. Simulations demonstrate the validity of the proposed scheme.

关键词： X channel space-time code pre-coding multi-user interference feedback amount transmission efficiency

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Joint multi-user space time block coding and beamforming via convolutional weighting

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High Technology Letters 2006年第2期12卷 119-123页

作者：邢志强 Zhou Tingxian Meng Weixiao Communication Research Center Harbin Institute of Technology Harbin 150001 P. R. China

A convolutional weighting （CW） scheme applied to a half-wavelength spacing array was proposed for multi-user system to joint STBC （space time block ceding） and beam forming （BF）. The transmitting beam is equivalent to the product of two sub-beams. One is used to realize interference suppression, while the other is employed to form a couple of uncorrelated channels from base station （BS） to the desited user （to meet the requirement of STBC） and to maximize SINR （signal-to-interference-plus noise ratio） at the desired receiver. As an optimum combination of STBC and beam forming, the proposed scheme can achieve both full diversity order of STBC and array gain of BF. Meanwhile, it can also effec- tively restrain multi-user interference by nulling. Simulation results show that the proposed scheme can significantly improve the BER （Bit Error Rate） performance and enhance system capacity as compared with the conventional eigen-beamforming （EBF） technique applied to a half-wavelength spacing array.

关键词： space time block ceding beam forming convolutional weighting multi-user interference

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