Design of Nonuniform Filter Bank Transceivers for Frequency Selective Channels
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Research Article Design of Nonuniform Filter Bank Transceivers for Frequency Selective Channels Han-Ting Chiang,1 See-May Phoong,1 and Yuan-Pei Lin2 1 Department
of Electrical Engineering, Graduate Institute of Communication Engineering, National Taiwan University, Taipei 10617, Taiwan 2 Department of Electrical and Control Engineering, National Chiao Tung University, Hsinchu 300, Taiwan Received 14 January 2006; Revised 16 July 2006; Accepted 13 August 2006 Recommended by Soontorn Oraintara In recent years, there has been considerable interest in the theory and design of filter bank transceivers due to their superior frequency response. In many applications, it is desired to have transceivers that can support multiple services with different incoming data rates and different quality-of-service requirements. To meet these requirements, we can either do resource allocation or design transceivers with a nonuniform bandwidth partition. In this paper, we propose a method for the design of nonuniform filter bank transceivers for frequency selective channels. Both frequency response and signal-to-interference ratio (SIR) can be incorporated in the transceiver design. Moreover, the technique can be extended to the case of nonuniform filter bank transceivers with rational sampling factors. Simulation results show that nonuniform filter bank transceivers with good filter responses as well as high SIR can be obtained by the proposed design method. Copyright © 2007 Hindawi Publishing Corporation. All rights reserved.
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INTRODUCTION
The orthogonal frequency division multiplexing (OFDM) system has enjoyed great success in many wideband communication systems due to its ability to combat intersymbol interference (ISI) [1]. It is known that the transmitting and receiving filters of the OFDM transceiver have poor frequency responses. As a result, many subchannels will be affected when there is narrowband interference, and the performance degrades significantly [2]. Many techniques have been proposed to solve this problem. One of the solutions is the filter bank technique. In recent years, there has been considerable interest in the application of filter banks to the design of transceivers with good frequency characteristics [2–10]. Many of these previous studies [3–6] have focused on the design of filter bank transceivers (or transmultiplexers) under the assumption that the transmission channel is an ideal channel that does not create ISI. When the channel is a frequency selective channel, these filter bank transceivers suffer from severe ISI effect [7, 8], and post processing technique is needed at the receiver for channel equalization [4]. Recently the authors in [10] studied the filter bank transceiver for frequency selective channels. The transmitting and receiving filters are optimized for SIR
(signal-to-interference ratio) maximization. Like OFDM systems, simple one-tap equalizers can be employed at the receiver for channel equalization. It has been demonstrated that filter bank transceivers with high SIR and good frequency
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