In this paper a procedure is given for obtaining the channel impulse response for a rectangular room in terms of image sources. Exact image source strengths are evaluated using the Laplace transform formulation of the Sommerfeld problem. The coherent component of the impulse response is shown to exhibit significant variation is space. The performance of a decision feedback equalizer is examined...

For underwater acoustic channels where multipath spread is measured in tens of symbol intervals at high transmission rates, multichannel equalization required for bandwidth-efficient communications may become prohibitively complex for real-time implementation. To reduce computational complexity of signal processing and improve performance of data detection, receiver structures that are matched ...

To ensure the signal integrity over a lossy channel, an analog equalizer and/or a decision-feedback equalizer (DFE) [2-6] are widely adopted in high-speed data transmission. An adaptive analog equalizer or adaptive DFE is also attractive to compensate the frequency-dependent loss due to the different channel lengths and environment variations. Conventionally, a multiple-tap DFE is adopted to co...

This paper presents a four-level pulse amplitude modulation (PAM-4) receiver that incorporates continuous time linear equalizer, variable gain amplifier, phase interpolator-based clock and data recovery, 4-tap direct decision feedback equalizer (DFE) for moderate channel loss applications in wireline communication. A dynamic current-mode logic comparator (DCMLC) is proposed employed the DFE. Th...

Decision feedback equalizers are widely used non-linear equalizers which are used to reduce the inter symbol interference in the communication systems. Selection of proper weights for forward and feedback filters is very important for the designing of efficient decision feedback equalizers. Performance of the most of existing wireless communication systems degrades under higher PSK (Phase Shift...

A decision-feedback equalizer scheme is derived based on multiple-hyperplane partitioning of signal space for detectingM -ary pulse amplitude modulation symbols transmitted through a noisy intersymbol interference channel. The proposed scheme is based on the fact that the optimal Bayesian decision boundary separating two neighboring signal classes is asymptotically piecewise linear and consists...

This paper considers a decision-feedback-equalizer (DFE)-based soft decision detector as an alternative for the Bahl–Cocke–Jelinek–Raviv (BCJR) front-end for a coded magnetic recording channel. In previous work, a bidirectional-arbitrated DFE (BAD) was shown to perform in between a BCJR detector and a minimum mean-square error DFE. We propose a soft-output BAD (S-BAD) which takes advantage of t...

This paper addresses the problem of equalization space-time codes with transmit diversity. We derive a symbol-by-symbol MAP equalizer/decoder for space-time coded signals over frequency selective channels. We describe a turbo equalization/decoding scheme where the results of the decoding are fed back to the equalizer. Simulation results show an improved equalizer performance due to the feedback.