Baoyu Zheng

Nanjing University of Posts and Telecommunications, Nan-ching, Jiangsu Sheng, China

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Publications (5)1.41 Total impact

  • XiaoRong Xu, JianWu Zhang, BaoYu Zheng
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    ABSTRACT: In cognitive radio network (CRN) where primary user (PU) and secondary user (SU) wish to communicate with their corresponding receivers simultaneously over frequency selective fading channels, the interference between PU and SU should be eliminated in order to realize spectrum sharing. Precoder division multiple access (PDMA) that implements Vandermonde precoder in cognitive orthogonal frequency division multiplexing (OFDM) is proposed, which benefits from the frequency selectivity of the cognitive channel to form a frequency beam-former. Vandermonde precoder enables SUs to achieve higher bit rate with optimal power allocation strategy under the condition of PU interference constraint. Numerical and simulation results are presented to prove theoretical derivations. It is shown that, achievable bit rates (ABR) of SU could be achieved with optimal power allocation scheme in CRN. Meanwhile, it is also verified that, with Vandermonde precoder to form PDMA, SU’s signal-to-noise ratio (SNR) and the target rate of PU could impact the ABR of SU significantly in CRN.
    Sciece China. Information Sciences 01/2011; 54:1471-1480. · 0.71 Impact Factor
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    Xiaorong Xu, Baoyu Zheng
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    ABSTRACT: A novel multi-relay cooperative communication strategy based on Jackson queuing model is proposed, which is implemented via a cross-layer design between the physical (PHY) layer and the medium access control (MAC) layer. In the PHY layer, we focus mainly on system outage performance by analyzing in detail the relationship between the SNR threshold and the outage probabilities. While in the MAC layer, system model is treated as a Jackson queuing network, and the queue discipline for each node is assumed to be GI/M/1 model. System throughput and delay performance for the proposed strategy are also illustrated. Simulation results of the proposed cross-layer scheme are presented to validate our theoretical derivations. It is revealed that, the number of cooperative nodes influences system outage performance at high spectral efficiency regimes in the PHY layer while the proposed strategy provides a better throughput and delay performance than conventional schemes in the MAC layer.
    Sciece China. Information Sciences 01/2010; 53:842-853. · 0.71 Impact Factor
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    ABSTRACT: Efficient anti-jamming rateless coding based on cognitive Orthogonal Frequency Division Multiplexing (OFDM) modulation in Cognitive Radio Network (CRN) is mainly discussed. Rateless coding with small redundancy and low complexity is presented, and the optimal design methods of building rateless codes are also proposed. In CRN, anti-jamming rateless coding could recover the lost packets in parallel channels of cognitive OFDM, thus it protects Secondary Users (SUs) from the interference by Primary Users (PUs) efficiently. Frame Error Rate (FER) and throughput performance of SU employing anti-jamming rateless coding are analyzed in detail. Performance comparison between rateless coding and piecewise coding are also presented. It is shown that, anti-jamming rateless coding provides low FER and Word Error Rate (WER) performance with uniform sub-channel selection. Meanwhile, it is also verified that, in higher jamming rate and longer code redundancy scenario, rateless coding method could achieve better FER and throughput performance than another anti-jamming coding schemes. Key wordsAnti-jamming rateless coding–Cognitive Orthogonal Frequency Division Multiplexing (OFDM)–Frame Error Rate (FER)–Word Error Rate (WER)–Throughput performance
    Journal of Electronics (China) 01/2010; 27(6):781-789.
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    ABSTRACT: This paper researches a new unifying model of Multi-user Communication System based on Perfect-Reconstruction Quadrature Mirror Filters (PR-QMF). Software Radio (SR) Technology is applied in this paper in order to develop the Smart Mobile Phone. The hardware evaluation board of Smart Mobile Phone is constructed by S3C2410 processor and M23 Base Band/Radio Frequency (RF) processor, while its software platform is designed by Embedded Linux and Qt/Embedded. The Smart Phone supports Speech Service, Short Message Service (SMS), Image Service, and Network Service, etc. The features and difficulties in the Research and Development (R&D) of Smart Phone's hardware and software are presented in detail in this paper. In the end, the TDMA multiple access is implemented on this unifying model of Multi-user Communication by means of the Smart Mobile Phone evaluation board, which provides a perfect example for the further research.
    Wireless, Mobile and Sensor Networks, 2007. (CCWMSN07). IET Conference on; 01/2008
  • Xiaorong Xu, Baoyu Zheng, Jianwu Zhang
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    ABSTRACT: Dual-hop cooperative Multiple-Input Multiple-Output (MIMO) network with multi-relay cooperative communication is introduced. Power allocation problem with Amplify-and-Forward (AF) and Selective Decode-and-Forward (SDF) strategies in multi-node scenario are formulated and solved respectively. Optimal power allocation schemes that maximize system capacity with AF strategy are presented. In addition, optimal power allocation methods that minimize asymptotic Symbol Error Rate (SER) with SDF cooperative protocol in multi-node scenario are also proposed. Furthermore, performance comparisons are provided in terms of system capacity and approximate SER. Numerical and simulation results confirm our theoretical analysis. It is revealed that, maximum system capacity could be obtained when powers are allocated optimally with AF protocol, while minimization of system’s SER could also be achieved with optimum power allocation in SDF strategy. In multi-node scenario, those optimal power allocation algorithms are superior to conventional equal power allocation schemes. Key wordsDual-hop cooperative Multiple-Input Multiple-Output (MIMO) network-Optimal power allocation-Amplify-and-Forward (AF)-Selective Decode-and-Forward (SDF)-System capacity-Asymptotic Symbol Error Rate (SER) CLC indexTN929.5
    Journal of Electronics (China) 27(3):328-339.