IQ Imbalance Compensation Scheme for MB-OFDM with Transmit Diversity
IQ Imbalance Compensation Scheme for MB-OFDM with Transmit Diversity
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DOI：
10.1109/icu.2006.281565
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Tsuyoshi Ikuno;Y. Sanada
中科院分区：
文献类型：
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作者：
Tsuyoshi Ikuno;Y. Sanada
目前，多带OFDM（MB-OFDM）被认为是UWB的调制方案之一，并被积极研究。为了使MB-OFDM系统得到广泛的支持，有必要为用户提供低成本的接收机。这样的接收机可以通过利用直接转换架构来实现。直接转换架构已经被研究用于无线接收器的成本最小化、小型化和低功耗的目的。然而，当使用直接转换架构时，解调信号的同相分量和正交相位分量之间的平衡丢失。这种现象被称为IQ失衡。IQ不平衡是直接变频接收机的主要问题之一。IQ不平衡导致解调信号中的载波间干扰（ICI）。本文提出了一种利用发射分集进行IQ不平衡补偿的新方案。该方案使系统在实现频率分集的同时，补偿了IQ不平衡的影响。结果表明，该方案的性能优于传统的IQ不平衡补偿方案
Currently, multi-band OFDM (MB-OFDM) is considered as one of the modulation schemes of UWB and is actively investigated. It is necessary to provide low cost receivers for consumers in order to receive wide support for MB-OFDM system. Such receivers can be achieved by utilizing direct conversion architecture. The direct conversion architecture has been investigated for the purpose of cost minimization, miniaturization, and low power consumption of wireless receivers. However, the balance between the in-phase component and the quadrature-phase component of demodulated signals is lost when direct conversion architecture is used. This phenomenon is called IQ imbalance. IQ imbalance is one of the problems for the direct conversion receiver. IQ imbalance causes intercarrier interference (ICI) in the demodulated signals. In this paper, a new scheme of IQ imbalance compensation using transmit diversity is proposed. This scheme enables the system to achieve frequency diversity and compensate the influence of IQ imbalance at the same time. It is shown that the performance of the proposed scheme is better than the conventional IQ imbalance compensation scheme