Faster than Nyquist signaling increases the spectral efficiency of pulse amplitude modulation by accepting intersymbol interference, where an equalizer is needed at receiver. Since complexity optimal exponentially with number interfering symbols, practical truncated equalizers assume shorter memory. The power resulting residual interference depends on transmit filter and limits performance equa...

This study presents a tap-leakage adjustment algorithm to control the tap drifting problem in an adaptive echo canceller. A nonrecursive transversal filter structure and stochastic gradient adaptation algorithm are first studied. On the basis of these studies, the effect of tap drift when the input spectrum does not cover the full band is presented. The tap-leakage algorithm, which has been use...

The “sum of power of two (SPT)” is an effective format to represent multipliers in a digital filter which reduces the complexity of multiplication to a few shift and add operations. The canonic SPT is a special sparse SPT representation that guarantees occurrence of at least one zero between every two nonzero SPT bits. This paper presents a novel algorithm for bit serial addition of two numbers...

In this paper two new adaptive equalizers are proposed which belong to the quasi-Newton (QN) algorithmic family. The first algorithm is a Linear Equalizer (LE) and the second one is a Decision Feedback Equalizer (DFE). In the LE case the involved inverse Hessian matrix is approximated by a proper expansion consisting of powers of a Toeplitz matrix. Due to this formulation the algorithm can be e...

In this paper, we describe adaptive methods for estimating FIR zero-forcing blind equalizers with arbitrary delay directly from the linear predictions of the observations. While most current methods require inversion or singular value decomposition (SVD) of the correlation matrix, our methods need only to solve two linear prediction problems. They can be implemented as RLS or LMS algorithms to ...

Recently, the authors developed a new synthesis technique for the design of higher-order Bode-type variable-amplitude (VA) wavedigital (WD) equalizers. The salient feature of the resulting VA WD equalizers is that they permit the continuous variation of the WD equalizer transfer function from a shaping transfer function to its inverse by changing the value of a single variable digital multiplie...

In this paper, we propose a low complexity architecture for turbo equalizers. Turbo equalizers jointly equalize and decode the received signal by exchanging soft information iteratively. The proposed architecture employs early termination of the iterative process when it does not impact the bit-error rate PER). Early termination enables the powering down parts of the soft-input soft-output (SIS...

In digital communication system, symbols are generated in a source and transmitted over a channel to a receiver. Noise gets added during the transition of symbols over the channel from source to the destination. In practice the symbols are corrupted with nonlinear distortion, Inter Symbol Interference (ISI) and noise. One possibility to reduce the effect of this problem is to use a channel equa...

Since the introduction of adaptive equalizers in digital communication systems by Lucky [1], much progress has been made. Due to their particular constraints many new and different concepts in the wireless domain have been proposed. The wireless channel is typically time and frequency dispersive, making it difficult to use standard equalizer techniques. Also, due to its time varying nature, lon...

Data-intensive applications such as video streaming, cloud computing, and virtual presence devices require data to be transmitted among chips, modules, and chassis via serial copper channels at tens of giga-bit-per-second (Gbps), as shown in Table 1. The data rate of these links is limited by inter-symbol interference (ISI) arising from channel impairment such as finite bandwidth, reflection, a...