This paper introduces a novel blind adaptive multiple-input decision-feedback equalizer (MI-DFE) which is basically characterized by its ability to self-optimize its configuration, in terms of both structure and criteria, according to the severity of the transmission medium. In the first running mode, the novel equalizer is recursive, linear and “blindly” adapted by criteria leading to a soluti...

We describe and evaluate an algorithm for determining decision-feedback equalizer (DFE) coefficient placements from an estimated channel response. Efficient tap placement is desirable to minimize equalizer computation in multichannel, underwater acoustic environments due to long, potentially sparse channel responses lasting hundreds of symbols or more. Although our algorithm relies on heuristic...

In this paper, trellis-coded M-ary CPFSK with noncoherent envelope detection and adaptive channel equalization are investigated to improve the bit error rate (BER) performance of microcellular digital wireless communications systems. For the same spectral efficiency, the trellis-coded modulation (TCM) schemes studied outperform minimum shift keying (MSK) with noncoherent or differentially coher...

We systematically analyze the biased and unbiased minimum mean square error (MMSE) equalizers of finite as well as infinite length, with and without decision feedback sections. New closed-form expressions of optimum equalizer weights, the MMSE, and symbol error probabilities (SEP), solely in terms of channel response parameters and noise power, are derived for the above receivers. These new exp...

We present a computationally efficient soft-output equalizer for communication over dispersive channels. The proposed equalizer has a forward and backward recursion structure similar to the classic BCJR MAP algorithm, but its complexity is reduced by constructing a reduced-state trellis, as in the decision feedback sequence estimator (DFSE). We are able to achieve consistent state definitions b...

In this paper, we proposed a novel receiver algorithm for coherent underwater acoustic communications. The proposed receiver is composed of three parts: (1) Doppler tracking and correction, (2) Time reversal channel estimation and combining, and (3) Joint iterative equalization and decoding (JIED). To reduce computational complexity and optimize the equalization algorithm, Time reversal (TR) ch...

This paper investigates the application of the multilayer perceptron structure to the packet-wise adaptive decision feedback equalization of a Mary QAM signal through a TDMA indoor radio channel in the presence of intersymbol interference (ISI) and additive Gaussian noise. Since the multilayer neural networks are capable of producing complex decision regions with arbitrarily nonlinear boundarie...

Polynomial cancellation coded orthogonal frequency division multiplexing with overlapping symbol periods (Overlap PCC-OFDM) is a modulation technique that is less sensitive to frequency errors and more robust against multipath distortion than OFDM. A cyclic prefix is no longer needed. However, fading is still a problem and will cause bit errors. Error propagation will occur as decision feedback...

of the Thesis An Area Efficient 4Gb/s 3-Tap Decision Feedback Equalizer with Current-Integrating Summer by Chen Zhang Master of Science in Electrical and Computer Engineering Northeastern University, April 2016 Prof. Yong-Bin Kim, Adviser As the requirement of wire line applications increases, the demand for higher data transmission bandwidth is continuously exploding. While the on-chip speed h...

The bidirectional decision feedback equalizer (DFE) performs two equalizations, one on the received signal and one on its timereversed version. In this paper, we apply the bidirectional DFE to wireless transmissions on rapidly time-varying dispersive channels and we propose an efficient implementation obtained by implementing the feedforward filter in the frequency domain. The feedback filter i...