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Joint TX/RX IQ Mismatch Compensation Based on a Low-IF Internal Feedback Architecture

机译：基于低中频内部反馈架构的联合TX / RX IQ不匹配补偿

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摘要

Modern radios use in-phase (I) and quadrature-phase (Q) channels for transmission and reception. However, IQ matching for high image rejection ratio is difficult and costly to realize by pure analog circuit techniques. Therefore, digital-assisted IQ compensation is required. This paper presents a novel joint TX/RX IQ compensation (JTRC) algorithm for low-IF feedback architecture. Conventional approaches are based on time-domain processing of test tones or frequency-domain processing of pilots in orthogonal frequency-division multiplexing (OFDM) systems. In contrast, JTRC employs time-domain blind source separation (BSS) for both OFDM and non-OFDM based systems without placing a specific requirement on the type of test signal. For example, JTRC supports both tones and modulated signals. Moreover, JTRC can be performed in the background during normal transmission mode using the actual transmitted signal. Unlike other BSS approaches that can only compensate for RX IQ mismatches while assuming a matched transmitter, JTRC can jointly compensate for both TX and RX IQ mismatches. We present an in-depth analysis that validates the JTRC algorithm and show simulation results that demonstrate its effectiveness.
机译：现代无线电使用同相（I）和正交相（Q）信道进行发送和接收。然而，通过纯模拟电路技术来实现高镜像抑制比的IQ匹配既困难又昂贵。因此，需要数字辅助的IQ补偿。本文提出了一种用于低中频反馈架构的新型联合TX / RX IQ补偿（JTRC）算法。常规方法是基于正交频分复用（OFDM）系统中测试音的时域处理或导频的频域处理。相反，JTRC对基于OFDM和非OFDM的系统都采用时域盲源分离（BSS），而对测试信号的类型没有特殊要求。例如，JTRC支持音频和调制信号。此外，在正常传输模式下，可以使用实际传输的信号在后台执行JTRC。与其他BSS方法不同，后者只能在假设匹配的发射机的情况下补偿RX IQ不匹配，而JTRC可以共同补偿TX和RX IQ不匹配。我们提供了一个深入的分析，可以验证JTRC算法并显示仿真结果来证明其有效性。

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