5th International ICST Conference on Wireless Internet

Research Article

Relay-assisted MIMO transmission with three-phase scheduling in cognitive radio networks

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  • @INPROCEEDINGS{10.4108/ICST.WICON2010.8620,
        author={Sen Shao and Qingmin Meng and Wenhui Zong and Wei-ping Zhu},
        title={Relay-assisted MIMO transmission with three-phase scheduling in cognitive radio networks},
        proceedings={5th International ICST Conference on Wireless Internet},
        publisher={IEEE},
        proceedings_a={WICON},
        year={2010},
        month={4},
        keywords={Cognitive radio MIMO Relays Silicon compounds},
        doi={10.4108/ICST.WICON2010.8620}
    }
    
  • Sen Shao
    Qingmin Meng
    Wenhui Zong
    Wei-ping Zhu
    Year: 2010
    Relay-assisted MIMO transmission with three-phase scheduling in cognitive radio networks
    WICON
    IEEE
    DOI: 10.4108/ICST.WICON2010.8620
Sen Shao1, Qingmin Meng1,2, Wenhui Zong1, Wei-ping Zhu1,3
  • 1: Institute of Signal and Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China
  • 2: National Mobile Communications Research Lab, Southeast University, Nanjing, 210096, China
  • 3: Centre for Signal Processing and Communications, Dept. of Electrical and Computer Engineering, Concordia University, Montreal, Quebec, Canada, H3G 1M8

Abstract

In this paper, we investigate a joint scheduling and transmitting scheme in cognitive radio networks. Three phases are considered in the proposed scheme(named scheme 1): l)in the first phase, N_t primary users(PUs) in the high-rate region are chosen to implement communication with primary base station (PBS); 2)in the second phase, PBS will support simultaneously the fixed relay station(RS) and the selected PUs in the high-rate region based on certain beamforming(BF); 3)in the third phase, selected PUs in the low-rate region and selected cognitive users(CUs) in the cognitive region are supported by RS. In particular, during the phases above, all selected users send back their channel covariance matrices to PBS or RS on the purpose of lowering the feedback and implementing certain BE Furthermore, a frame structure used for the joint scheduling and transmitting scheme is presented and the performance of scheme 1 with imperfect channel covariance matrix feedback is evaluated to compare with that of scheme 1 with perfect feedback. From the simulation results, the proposed scheme(scheme 1) can significantly improve the throughput of the network over the basic system(named scheme 2) without spectral sharing.