Parallel architectures for decision-directed adaptive recursive least-squares (RLS) equalizers based on a QR-decomposition (QRD) using square-root free Givens-rotations are derived that allow very high throughput for broadband applications. We apply an algorithmic optimization that leads to the use of additional fast adder trees together with a re-timing of the required arithmetic components to...

Constellation design has been previously addressed by assuming that there is a linear equalizer at the receiver side. However, the widely linear equalizer is well known to outperform the linear one with no significant complexity increase; we derive optimum and suboptimum techniques for constellation design in presence of such an equalizer. The proposed techniques adapt the circularity propertie...

To improve the elliptic filters step response, group delay equalizers are often cascaded with the filters. This paper describes the design of switched-current (SI) group delay equalizer using wave synthesis technique. This design is based on a new all-pass circuit, where the poles are generated using wave structures. Simulation results are included demonstrating that the 3 rd-order SI group del...

This paper investigates the subject of turbo equalizations in which a receiver combines the equalization and decoding process in an iterative fashion. In order to save in complexity, a linear equalizer with two inputs, one for the received signal and one for the extrinsic information, replaces the aposteriori probability (APP) processor used for the equalization. The equalizer tap gains are det...

It is proposed that a dynamic Bayesian network (DBN) is used to perform turbo equalization in a system transmitting information over a Rayleigh fading multipath channel. The DBN turbo equalizer (DBN-TE) is modeled on a single directed acyclic graph by relaxing the Markov assumption and allowing weak connections to past and future states. Its complexity is exponential in encoder constraint lengt...

| In this paper, a novel noncoherent linear equalization scheme is introduced and analyzed. The proposed scheme is not only applicable for M{ ary di erential phase{shift keying (MDPSK) but also for M{ary di erential amplitude/phase{shift keying (MDAPSK) and minimizes the variance of intersymbol interference (ISI) in the equalizer output signal. The optimum equalizer coeÆcients may be calculated...

This paper proposes a new spatio-temporal equalization method using a cascade configuration of an adaptive antenna array and a DFE (Decision Feedback Equalizer). The spatio-temporal equalizer with the cascade configuration can be realized in low computational complexity, however, the error performance surface becomes a fourth-order function of the weights, and possibly has two minima. In order ...

Recent studies show that equalizers with different equalization delays achieve different performances. The best performed equalizer is not necessarily the one with 0-delay, and often not the case when the channel is non-minimum-phase. In this paper, a blind channel equalization algorithm is presented, by which equalizers with all possible equalization delays can be calculated simultaneously fro...

Adaptive equalizer is important in transmission of wireless communication. The equalizer using least mean square (LMS) algorithm is adopted. Simulation results show that step size influences the algorithm convergence and stability, which will significantly affect the performance of adaptive equalizer. The requirement of step for convergence speed, time-varying tracking accuracy and convergence ...

AhtractIn this work, an extended class-IV partial response (EPR4) equalizer for a digital recording channel is replaced by a nonlinear equalizer which is based on a neural network. It is shown that such a scheme has several decibels of signal-to-noise ratio gain compared to linear equalization, when the channel is corrupted by transition noise and media nonlinearity. An error confinement approa...