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Wireless Personal Communications
Erschienen in: Wireless Personal Communications 2/2013

01.09.2013

Differential Quadrature Amplitude Modulation and Relay Selection with Detect-and-Forward Cooperative Relaying

verfasst von: Yang Gao, Jianhua Ge, Weijie Cong

Erschienen in: Wireless Personal Communications | Ausgabe 2/2013

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Abstract

In this paper, we consider a cooperative communication system with differential modulation and relay-selection (DM–RS) in multi-relay networks, where the best relay is selected to forward the source node’s signal to the destination node with detect-and-forward (DetF) protocol. Unlike the conventional DM–RS–DetF scheme using phase shift keying (PSK), we propose a DM–RS–DetF scheme with quadrature amplitude modulation (QAM). Since the differential PSK scheme cannot be applied to the QAM constellations directly, we firstly develop the modulation and demodulation methods for the differential QAM scheme. Then, we derive a closed-form approximation and an upper bound of the symbol error rate for the DQAM–RS–DetF scheme over independent Rayleigh fading channels, by using the approximated signal-to-noise ratio of the equivalent relay link. Simulations results verify the validity of the analytical results and further show that when the modulation order \(M>8\) in Rayleigh fading channels, the DQAM–RS–DetF scheme outperforms the DPSK–RS–DetF scheme.
Vorheriger Artikel A Queuing Theory-Enabled Dynamic Bandwidth Allocation Algorithm for a Wired-Wireless Converged Network
Nächster Artikel Resource Allocation for Real Time Services in LTE Networks: Resource Allocation Using Cooperative Game Theory and Virtual Token Mechanism

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Fußnoten
1
In [16], the proposed MLC is given by Eq. (8), i.e., \({{z}_{m}}\left( n \right) \approx y_{{ SD}}^{\text{* }}\left( n-1 \right) {{y}_{{ SD}}}\left( n \right) \text{+ }\frac{{{\gamma }_{eq}}}{{{\gamma }_{{ RD}}}}y_{{ RD}}^{\text{* }}\left( n-1 \right) {{y}_{{ RD}}}\left( n \right) \). If we consider a noise free situation, combining Eqs. (1), (2) and (5) in [16], we can obtain \({{z}_{m}}\left( n \right) \approx {{\mu }_{{ SD}}}d\left( n \right) +{{\mu }_{eq}}\tilde{d}\left( n \right) \), where \({{\mu }_{{ SD}}}={{\left| {{h}_{{ SD}}} \right| }^{2}}, {{\mu }_{eq}}=\min \{ {{\left| {{h}_{{ SR}}} \right| }^{2}}, {{\left| {{h}_{{ RD}}} \right| }^{2}} \}\). This is the MLC we used in this paper.
 
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Metadaten
Titel
Differential Quadrature Amplitude Modulation and Relay Selection with Detect-and-Forward Cooperative Relaying
verfasst von
Yang Gao
Jianhua Ge
Weijie Cong
Publikationsdatum
01.09.2013
Verlag
Springer US
Erschienen in
Wireless Personal Communications / Ausgabe 2/2013
Print ISSN: 0929-6212
Elektronische ISSN: 1572-834X
DOI
https://doi.org/10.1007/s11277-013-1085-0

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