Single carrier frequency division multiple access (SCFDMA) is one well-known scheme, which has recently become a preferred choice for uplink channels. Due to the usage of single carrier, the performance of SC-FDMA systems degrades in deep frequency selective fading channels. In this paper, we propose a structure of equalizer based on frequency domain decision feedback which could be used for mu...

Underwater wireless communication is quickly becoming a necessity for applications in ocean science, defense, and homeland security. Acoustics remains the only practical means of accomplishing long-range communication in the ocean. The acoustic communication channel is fraught with difficulties including limited available bandwidth, long delay-spread, time-variability, and Doppler spreading. Th...

A 125 MHz digital equalizer has been designed based on a 0.25 μm CMOS standard cell library. Partially conforming to the Gigabit Ethernet 1000Base-T standard, the equalizer includes a 16-tap feed-forward adaptive FIR filters accepting 8-bit input, and a 16-tap decision-feedback adaptive FIR filters producing 5-level output symbols. The modified Booth encoding and Wallace tree compression scheme...

We propose a computationally e cient version of the Decision Feedback Equalizer (DFE) and compare its performance with the conventional DFE. The proposed equalizer requires fewer taps than the conventional one. This reduces the computational load proportionally and leads to faster adaptation. Identical performance of the two structures in terms of probability of error is also demonstrated using...

A new and efficient class of nonlinear receivers is introduced for digital communication systems. These “iterated-decision” receivers use optimized multipass algorithms to successively cancel interference from a block of received data and generate symbol decisions whose reliability increases monotonically with each iteration. Two variants of such receivers are discussed: the iterated-decision e...

This paper presents the theoretical aspects of a methodology for the design of robust orthogonal adaptive decision feedback equalizers. The dispersive transmission channel is assumed to have a transfer function type of description with small uncertainties in the parameters. A decision feedback equalizer is designed minimizing a mean square error objective function that takes into account the un...

This paper presents a comparative analysis of various linear and nonlinear equalizers for a high density optical channel. Since the read-out process is nonlinear, a suitable model basedon the Volterra series has been adopted. In this work, we compare the performance and complexity of equalizers designed for linear and nonlinear channels. Specifically, Adaptive Minimum Mean Square Error (MSE), A...

Supplementing their traditional view as a signalling or coding method, this paper elaborates a reception perspective of partial response techniques. It treats the data equalization problem that arises when an a priori selected partial response is secluded from a noisy dispersive communication channel and the equalization effort is exclusively directed to its remainder. For a given subdivision o...

− This paper introduces an algorithm for blind adaptation of decision feedback equalizers (DFE), which is applied for equalization in the passband domain. The transmission scheme, which is assumed to be unknown at the receiver side, can either be carrierless amplitude/phase (CAP) modulation or quadrature amplitude modulation (QAM). As the input signal of the passband equalizer is real-valued, t...