A novel frequency domain equalizer for single carrier modulation is presented. It performs as a decision feedback equalizer (DFE) with the feedforward operating in the frequency domain, and a feedback filtering in time domain. The new scheme makes use of a data block transmission format which can be seen as a generalization of the zero padded transmission. Performance comparisons between FD-DFE...

In wireless communication system, a Decision Feedback Equalizer (DFE) to cancel the intersymbol interference (ISI) is required. In this paper, an exact convergence analysis of the (DFE) adapted by the Least Mean Square (LMS) algorithm during the training phase is derived by taking into account the finite alphabet context of data transmission. This allows us to determine the shortest training se...

This paper presents an improved decision feedforward equalizer (DFFE) for high speed receivers in the presence of highly dispersive channels. This decision-aided equalizer technique has been recently proposed for multigigabit communication receivers, where the use of parallel processing is mandatory. Well-known parallel architectures for the typical decision feedback equalizer (DFE) have a comp...

This paper describes a fully-differential 1-Tap decision feedback equalizer (DFE) in 0.18μm SiGe BiCMOS technology. The circuit is capable of equalizing NRZ data up to 40 Gbps. A look-ahead architecture is used with modifications to reduce complexity in the high speed clock distribution. An analog differential voltage controls the tap weights. The design is fabricated in 0.18μm SiGe BiCMOS tech...

Concerning with the system level design of QAM cable receiver chip for cable HDTV DSP-based modem application, a receiver structure with joint Quadrature Amplitude Demodulator is introduced, blind decision feedback equalizer (DFE) loop, variable symbol timing recovery loop, carrier recovery loop and AGC loop. The architecture of blind DFE, with Constant Modulus Algorithm (CMA) initialization bl...

The problem of automatic gain control (AGC) for DFE (decision feedback equalization) read channels is addressed. We analyze an existing AGC algorithm that uses slicer input for deriving the gain error signal and show that it suffers from ambiguity in the control direction of AGC loop due to the presence of feedback equalizer. This could result in slow convergence and possible instability proble...

The emulation of a nonadaptive, binary decision feedback equalizer, operating on a noiseless, finite impulse response channel by a feedforward multilayer processor is considered. This feedforward perceptron equalizer comprises a triangular array of hard-limiting processing elements. The functional similarity between the two systems is exploited to obtain a tight upper bound on the probability o...

A new modified version called decision feedback complex recurrent neural network equalizer (DFCRNNE) is proposed with the study of complex recurrent neural network equalizer (CRNNE). Based on DFCRNNE, a modified real time recurrent learning (CRTRL) algorithm is developed. Simulation results show that DFCRNNE has better performance than CRNNE based on traditional CRTRL algorithm2 in complex nonl...

A new theoretical framework is introduced for analyzing the performance of a finite-length minimum-mean-squareerror decision feedback equalizer (MMSE-DFE) in a multi-input multi-output (MIMO) environment. The framework includes transmit and receive diversity systems as special cases and quantifies the diversity performance improvement as a function of the number of transmit/receive antennas and...