Journal ArticleDOI
Impulse response shortening for discrete multitone transceivers
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TLDR
Various methods of determining the coefficients for this time-domain finite impulse response (FIR) filter are explored and an optimal shortening and a least-squares approach are developed for shortening the channel's impulse response.Abstract:
In discrete multitone (DMT) transceivers an intelligent guard time sequence, called a cyclic prefix (CP), is inserted between symbols to ensure that samples from one symbol do not interfere with the samples of another symbol. The length of the CP is determined by the length of the impulse response of the effective physical channel. Using a long CP reduces the throughput of the transceiver, To avoid using a long CP, a short time-domain finite impulse response (FIR) filter is used to shorten the effective channels impulse response. This paper explores various methods of determining the coefficients for this time-domain filter. An optimal shortening and a least-squares (LS) approach are developed for shortening the channel's impulse response. To provide a computationally efficient algorithm a variation of the LS approach is explored. In full-duplex transceivers the length of the effective echo path impacts the computational requirements of the transceiver. A new paradigm of joint shortening is introduced and three methods are developed to jointly shorten the channel and the echo impulse responses in order to reduce the length of the CP and reduce computational requirements for the echo canceller.read more
Citations
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Proceedings ArticleDOI
Semi-Blind Time Domain Equalization for MIMO-OFDM Systems
Shaodan Ma,Tung-Sang Ng +1 more
TL;DR: Computer simulations show that the proposed semi-blind time domain equalization technique outperforms the existing ones and it is robust against the number of shifts in excess of the cyclic prefix length.
Proceedings ArticleDOI
A modified elgen approach method for the design of channel shortening equalizers in discrete multi-tone systems
TL;DR: A modified version of the Eigen approach is proposed with the aim of achieving higher bit rates with the aims of combating ISIACI and reviewing the MMSE TEQ design method.
Proceedings ArticleDOI
Channel shortening through bit error rate minimization for UWB systems
TL;DR: A TEQ design which minimizes the bit error rate (BER) of the system to perform efficient channel shortening in UWB systems is presented and it is shown that the proposed algorithm maintains a lower BER along with efficiently shortening the channel.
Proceedings Article
Blind adaptive equalization of OFDM transmission with insufficient cyclic prefix
Taewoo Han,Xiaohua Li +1 more
TL;DR: In this article, a new blind equalization method with both batch and adaptive algorithms developed for OFDM systems with insufficient cyclic prefix is presented, which can either reduce block size for low complexity or enhance bandwidth efficiency.
Proceedings ArticleDOI
Channel shortening in OFDM system with controlled TIR quality
TL;DR: This paper proposes non-blind shortening techniques with controlled target impulse response (TIR) quality that are computationally cheaper and lead to better BER performance in OFDM systems.
References
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