Abstract
Direct conversion transceivers are the preferred choice for the RF front-end in modern communication devices. They are simple and cheap to implement but for the case of sensitive multicarrier systems these devices may not maintain the required level of performance as regards image rejection (IR), carrier frequency offset (CFO) and direct current offset. In the presence of this non-ideal behaviour it is not possible to achieve a high signal to interference ratio (SIR). This situation necessitates the use of DSP schemes to efficiently mitigate these effects and also to relax the stringent requirements on transceiver design. In this paper we study the design of a receiver architecture which can jointly estimate the channel impulse response (CIR) as well as transmit and receive (Tx/Rx) IQ imbalance. We have proposed a simple system model for two-step iterative channel and IQ imbalance estimation using long training sequences (LTS) which are already a part of WLAN standards. In summary the proposed scheme provides an excellent low complexity solution for joint channel and Tx/Rx IQ imbalance parameter estimation.
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