A new and efficient class of nonlinear equalizers is developed for intersymbol interference (ISI) channels. These “iterated-decision equalizers” use an optimized multipass algorithm to successively cancel ISI from a block of received data and generate symbol decisions whose reliability increases monotonically with each iteration. These equalizers have an effective complexity comparable to the d...

This paper presents performance analysis of an adaptive Volterra/Hybrid equalizer in a nonlinear magneto-optic data storage channel. In a data storage system, nonlinear intersymbol interference (ISI) is one of the limiting factors for high storage density. Volterra and Hybrid (combination of linear and Volterra) equalizers are proposed and developed for compensation of nonlinear ISI. The use of...

In this paper we evaluate the performance of several Space-Time Coded GSM radio interfaces with channels measured in a tunnel of the Metro of Paris using a radiating system comprising of four transmitting and four receiving antennas. We first consider space-time equalization techniques that only account for the noise and the Intersymbol Interference (ISI) induced by the modulation and then anal...

A novel adaptive nonlinear equalizer for fast timevarying multipath channels that combines the channel-estimation and data-detection tasks is presented. The a posteriori probabilities (APP’s) of the states of the intersymbol interference (ISI) channel are recursively computed from the received data by a symbol-by-symbol (SbS) detector [7] and are then employed by a Kalman-type nonlinear channel...

An ultra-high data rate time reversal (TR) multiple-input multiple-output (MIMO) ultra-wideband (UWB) communication system with space-time precoding is proposed. When the symbol duration is set to approach the duration of UWBmonocycles, the data rate is close to the limit, resulting in the severe intersymbol interference (ISI). The zero-forcing (ZF) criterion-based spacetime precoding presented...

This paper proposes a frequency domain nulling filter and Turbo equalizer to suppress interference in the uplink of one-cell reuse single-carrier time division multiple access (TDMA) systems. In the proposed system, the desired signal in a reference cell is interfered by interference signals including adjacent-channel interference (ACI), co-channel interference (CCI), and intersymbol interferen...

Partial-Response Maximum-Likelihood (PRML) coding techniques overcome problems associated with intersymbol interference (ISI) on the premise that, once this interference is known, its effect can be removed. A core part of the analogue front-end of a PRML read channel, and the subject of this paper, is a continuous-time low-pass filter which carries out both pulse-shaping and noise-filtering. Th...

Orthogonal frequency division multiplexing (OFDM) technique is being applied extensively to high data rate digital transmission as it is a bandwidth efficient modulation scheme. In OFDM system, intersymbol interference (ISI) and intercarrier interference (ICI) occur due to synchronization errors. Fast, simple and robust synchronization algorithms are necessary for OFDM systems. In OFDM downlink...

This paper analyzes the error performance of multiple-input multiple-output (MIMO) systems in frequencyselective Rayleigh fading channels. A zero-forcing (ZF) receiver is applied to separate transmitted data streams for each resolvable multipath component. The decision for each symbol of a transmitted data stream is based on combining L zero-forced multipath components carrying information of t...

A space-time (ST) receiver is proposed for combating the cochannel interference (CCI) and intersymbol interference (ISI) in a frequency-selective multipath environment. The scheme involves two stages. First, a set of adaptive beamformers pointed at a prescribed angular sector in space is constructed on an oversampled antenna array, each providing effective suppression of CCI and reception of de...