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Design of the cognitive radio with partial channel state information at the transmitter

机译:发射机具有部分信道状态信息的认知无线电的设计

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In this paper, we present the cognitive radio system design with partial channel state information known at the transmitter (CSIT). We replace the dirty paper coding (DPC) used in the cognitive radio with full CSIT by the linear assignment Gel'fand-Pinsker coding (LA-GPC), which can utilize the limited knowledge of the channel more efficiently. Based on the achievable rate derived from the LA-GPC, two optimization problems under the fast and slow fading channels are formulated. We then derive semi-analytical solutions to the relaying ratios and precoding coefficients of these two problems. Simulation results show that the proposed semi-analytical solutions perform close to the optimal solutions found by brute-force search, and outperform the systems base on naive DPC. Asymptotic analysis also shows that these solutions converge to the optimal ones solved with full CSIT when the K-factor of Rician channels approaches infinity.
机译:在本文中,我们介绍了认知无线电系统设计,其中包含发射机(CSIT)已知的部分信道状态信息。我们将线性分配Gel'fand-Pinsker编码(LA-GPC)替换为完全CSIT中用于认知无线电的脏纸编码(DPC),可以更有效地利用信道的有限知识。基于LA-GPC的可达到速率,提出了快衰落信道和慢衰落信道下的两个优化问题。然后,我们得出这两个问题的中继率和预编码系数的半解析解。仿真结果表明,所提出的半解析解的性能接近于蛮力搜索找到的最优解,并且优于基于原始DPC的系统。渐近分析还表明,当Rician通道的K因子接近无穷大时,这些解收敛到采用完全CSIT求解的最优解。

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