Full Diversity Blind Signal Designs for Unique Identification of Frequency Selective Channels

TL;DR

This paper introduces novel phase shift keying (PSK) decomposition techniques and a blind signal design method that enables unique, full-diversity identification of frequency selective channels using minimal received signals in noise-free environments.

Contribution

It develops new closed-form PSK decomposition methods and a simple blind signal design technique for frequency selective channel identification.

Findings

Enables blind, unique channel identification with only two received blocks.

Achieves non-coherent full diversity in noisy environments.

Provides closed-form solutions for signals and channel coefficients.

Abstract

In this paper, we develop two kinds of novel closed-form decompositions on phase shift keying (PSK) constellations by exploiting linear congruence equation theory: the one for factorizing a $pq$-PSK constellation into a product of a $p$-PSK constellation and a $q$-PSK constellation, and the other for decomposing a specific complex number into a difference of a $p$-PSK constellation and a $q$-PSK constellation. With this, we propose a simple signal design technique to blindly and uniquely identify frequency selective channels with zero-padded block transmission under noise-free environments by only using the first two block received signal vectors. Furthermore, a closed-form solution to determine the transmitted signals and the channel coefficients is obtained. In the Gaussian noise and Rayleigh fading environment, we prove that the newly proposed signaling scheme enables non-coherent full diversity for the Generalized Likelihood Ratio Test (GLRT) receiver.