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
Bandwidth efficient OFDM transmitter diversity techniques
King F. Lee,Douglas B. Williams +1 more
TL;DR: In this article, bandwidth efficient space-time and space-frequency block-coded OFDM transmitter diversity techniques are proposed that exploit spatial diversity to eliminate the need for a cyclic prefix.
Proceedings ArticleDOI
An efficient implementation for MMSE based MIMO time domain equalizer
Li Youming,Amir Leshem +1 more
TL;DR: This work proposes a simple implementation of time domain equalizer for MIMO channels, also based on the MMSE criterion, and demonstrates the efficiency of the proposed approach on measured channels, where the NEXT channels are simultaneously shortened with the direct channels.
Proceedings ArticleDOI
Energy efficiency of OFDM systems using shorten-and-forward in outdoor-to-indoor relaying scenarios with short guard intervals
TL;DR: This paper proposes the use of a channel shortener at the relay node and shows that this will dramatically improve system performance in cases of both shorter guard interval and large delay spreads.
Proceedings ArticleDOI
A cyclic prefix based adaptive channel estimation algorithm for multicarrier systems
TL;DR: An adaptive channel estimation algorithm that exploits cyclic prefix from its data detection part and employs systolic block Householder transformation recursive least squares (SBHT-RLS) algorithm for channel tracking in multicarrier systems is presented.
Proceedings ArticleDOI
Equalization and block-synchronization for OFDM signals
TL;DR: In this paper, blind algorithms based on a deterministic framework are proposed for equalization of finite-memory linear time-invariant channels carrying OFDM signals and it is shown that equalizers termed "synchronizer-equalizers" can be estimated blindly and always result in block-synchronized output, thus making separate synchronization unnecessary.
References
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