A simple detect-and-forward scheme in fading channels
IEEE Communications Letters
Single and multiple relay selection schemes and their achievable diversity orders
IEEE Transactions on Wireless Communications
Relay technologies for WiMAX and LTE-advanced mobile systems
IEEE Communications Magazine
Differential modulation for decode-and-forward multiple relay systems
IEEE Transactions on Communications
Distributed Space-Time Coding in Wireless Relay Networks
IEEE Transactions on Wireless Communications
Improving amplify-and-forward relay networks: optimal power allocation versus selection
IEEE Transactions on Wireless Communications
Cooperative communications with relay-selection: when to cooperate and whom to cooperate with?
IEEE Transactions on Wireless Communications
Energy-Efficient Cooperative Relaying over Fading Channels with Simple Relay Selection
IEEE Transactions on Wireless Communications
Spectrally efficient noncoherent communication
IEEE Transactions on Information Theory
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Using Orthogonal and Quasi-Orthogonal Designs in Wireless Relay Networks
IEEE Transactions on Information Theory
Cooperative communication in wireless networks
IEEE Communications Magazine
A simple Cooperative diversity method based on network path selection
IEEE Journal on Selected Areas in Communications
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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 $$M8$$ in Rayleigh fading channels, the DQAM---RS---DetF scheme outperforms the DPSK---RS---DetF scheme.