Semi-blind Adaptive Beamforming for High-throughput Quadrature Amplitude Modulation Systems

Semi-blind fast equalization of QAM channels using concurrent gradient-Newton CMA and soft decision-directed scheme

This contribution considers semi-blind adaptive equalization for communication systems that employ high-throughput quadrature amplitude modulation signalling. A minimum number of training symbols, approximately equal to the dimension of the equalizer, are first utilized to provide a rough initial least-squares estimate of the equalizer’s weight vector. A novel gradient-Newton concurrent constan...

Blind Equalization for Fqpsk and Fqam Systems in Multipath Frequency Selective Fading Channels

Blind adaptive equalization with application for Non-Linearly Amplified (NLA) quadrature amplitude modulation (QAM) systems in multipath selective fading channels is presented. With an offset sampling strategy in the receiver, the proposed blind equalization using Constant Modulus Algorithm (CMA) exhibits a fast convergent speed for a family of quadrature modulated systems in NLA and multipath ...

Adaptive Beamforming Assisted Receiver

Adaptive beamforming is capable of separating user signals transmitted on the same carrier frequency, and thus provides a practical means of supporting multiusers in a space-division multipleaccess scenario. Moreover, for the sake of further improving the achievable bandwidth efficiency, highthroughput quadrature amplitude modulation (QAM) schemes have becomes popular in numerous wireless netwo...

Constant modulus algorithm aided soft decision directed scheme for blind space-time equalisation of SIMO channels

This paper investigates a blind space–time equaliser (STE) designed for single-input multiple-output (SIMO) systems that employ high-throughput quadrature amplitude modulation schemes. A constant modulus algorithm (CMA) aided soft decision-directed (SDD) scheme, originally derived for low-complexity blind equalisation of single-input single-output channels, is extended to the SIMO scenario. Sim...

Blind adaptive equalizers for quadrature amplitude modulated communication systems based on convex cost functions