A Differential ML Combiner for Differential Amplify-and-Forward System in Time-Selective Fading Channels

We propose a new differential maximum-likelihood (DML) combiner for noncoherent detection of the differential amplify-and-forward (D-AF) relaying system in the time-selective channel. The weights are computed based on both the average channel quality and the correlation coefficient of the direct and...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on vehicular technology 2016-12, Vol.65 (12), p.10157-10163
Main Authors: Lou, Yi, Ma, Yong-Kui, Yu, Qi-Yue, Zhao, Hong-Lin, Xiang, Wei
Format: Article
Language:English
Subjects:
Amplify and forward (AF)
Bit error rate
Channel estimation
Channels
Computer simulation
Correlation
Correlation coefficients
differential modulation
Diversity reception
Fading channels
noncoherent detection
performance analysis
Relaying
Relays
Selective fading
Signal to noise ratio
time-varying channels
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We propose a new differential maximum-likelihood (DML) combiner for noncoherent detection of the differential amplify-and-forward (D-AF) relaying system in the time-selective channel. The weights are computed based on both the average channel quality and the correlation coefficient of the direct and relay channels. Moreover, we derive a closed-form approximate expression for the average bit error rate (BER), which is applicable to any single-relay D-AF system with fixed weights. Both theoretical and simulated results are presented to show that the time-selective nature of the underlying channels tends to reduce the diversity gains at the low-signal-to-noise-ratio (SNR) region, resulting in an asymptotic BER floor at the high-SNR region. Moreover, the proposed DML combiner is capable of providing significant BER improvements compared with the conventional differential detection (CDD) and selection-combining (SC) schemes.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2016.2535299