Joint IterativeTx/Rx MMSE-FDE and ISI Cancellation for Single-Carrier Hybrid ARQ with Chase Combining
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Research Article Joint IterativeTx/Rx MMSE-FDE and ISI Cancellation for Single-Carrier Hybrid ARQ with Chase Combining Kazuki Takeda and Fumiyuki Adachi Department of Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University, 6-6-05, Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan Correspondence should be addressed to Kazuki Takeda, [email protected] Received 15 April 2010; Revised 25 July 2010; Accepted 2 September 2010 Academic Editor: D. D. Falconer Copyright © 2011 K. Takeda and F. Adachi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We propose a joint iterative transmit/receive (Tx/Rx) minimum mean square error (MMSE) frequency-domain equalization (FDE) and intersymbol interference cancellation (ISIC) suitable for single-carrier (SC) hybrid automatic repeat request (HARQ) with chase combining (CC). In the proposed scheme, a one-tap transmit MMSE-FDE and an iterative one-tap receive MMSE-FDE and ISIC are employed. Every time the retransmitted packet is received, a series of receive MMSE-FDE, antenna diversity combining, packet combining, and ISIC is carried out in an iterative manner by using updated receive MMSE-FDE weights in each iteration. The transmit MMSE-FDE weight is determined based on the prediction of the degree of residual ISI after the iteration process in a receiver. We theoretically derive a set of transmit and receive MMSE-FDE weights. We show by computer simulation that joint iterative Tx/Rx MMSE-FDE and ISIC achieves better packet error rate (PER) and higher throughput of SC-HARQ than the conventional Rx MMSE-FDE and ISIC.
1. Introduction The broadband wireless channel comprises many propagation paths having different time delays [1]. The minimum mean square error frequency-domain equalization (MMSEFDE) provides good bit error rate (BER) performance for broadband single-carrier (SC) transmissions in a severe frequency-selective fading channel [2–4]. However, the performance of SC using the MMSE-FDE is still a few dB away from the theoretical lower-bound due to residual intersymbol interference (ISI) after MMSE-FDE. The use of iterative MMSE-FDE and ISI cancellation (ISIC) has been extensively studied [5–10]. In [5–8], iterative receive (Rx) MMSE-FDE and ISIC was proposed. The receive FDE weight is updated based on the MMSE criterion by using the reliability information of data detection at the previous iteration. In [8], channel decoding is incorporated into each iteration process to further improve the performance. In [9, 10], iterative Rx MMSE-FDE and ISIC was proposed for SC-hybrid automatic repeat request (HARQ).
Recently, we took a different approach from the iterative receive processing and proposed a joint transmit/receive (Tx/Rx) MMSE-FDE [11] that exploits the channel state information (CSI) at both the transmitter and the receiver to improve the performance of broadb
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