零中频太赫兹通信I/Q不平衡数字补偿算法

Digital compensation algorithm for I/Q imbalance in zero intermediate frequency terahertz communication

摘要:

为满足传输速率不断提高的要求，未来的通信技术自然会向更高的载波频率发展，太赫兹通信技术成为其实现的一种可能。针对太赫兹通信系统零中频在大带宽背景下存在的I/Q不平衡问题，构建了太赫兹零中频架构下的I/Q不平衡损伤模型，完成了对应窄带和宽带场景下的算法推导和补偿架构设计；针对宽带场景，通过改进代价函数提升算法性能。仿真结果表明，提出算法相较于统计量的算法，均方误差(MSE)提升15 dB。在220 GHz零中频通信系统实验中，提出的窄带算法MSE提升了7 dB，宽带算法在此基础上提升了1 dB。

Abstract:

In order to meet the requirement of increasing transmission rate, the future communication technology will naturally develop to a higher carrier frequency, and terahertz communication technology becomes a possibility. Aiming at the I/Q imbalance problem in terahertz communication system under the background of large bandwidth, an I/Q imbalance damage model is constructed under terahertz zero-intermediate frequency architecture. The algorithm derivation and compensation architecture design are completed in corresponding narrowband and broadband scenarios, and the algorithm performance is improved by improving the cost function for broadband scenarios. The simulation results show that the Mean-Square Error(MSE) of the proposed algorithm is improved by 15 dB compared with that of the statistical algorithm. In the experiment of 220 GHz zero intermediate frequency communication system, the MSE of narrowband algorithm proposed in this paper is improved by 7 dB, and that of the broadband algorithm is improved by 1 dB.