Distributed space-time coding for regenerative relay networks

Cooperation among mobile users (MUs) in a wireless network can be very useful to reduce the total radiated power necessary to insure the delivery of the information with the desired quality of service. A systematic framework for achieving such a gain consists in making the cooperating nodes act as t...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 4; no. 5; pp. 2387 - 2399
Main Authors: Scutari, G., Barbarossa, S.
Format: Journal Article
Language:English
Published: Piscataway, NJ IEEE 01.09.2005
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Antenna arrays
Antennas
Applied sciences
Bit error rate
Coding
Cooperation
Cooperative communications
Detectors
distributed space-time coding (DSTC)
Exact sciences and technology
Operation, maintenance, reliability
Phase detection
Power system relaying
Quality of service
Radiocommunications
Regenerative
Relay
relay networks
Relays
Resource management
Strategy
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Transmitting antennas
Wireless communication
Wireless networks
distributed space[ time coding (DSTC)
Space-time codes
Relay
Bit error rate
Wireless telecommunication
Resource allocation
System design
relay networks
Decoding
Binary phase shift keying
Information delivery
Regenerative process
Cooperative communications
Transmitting antenna
Maximum likelihood
Resource management
Radiated power
Antenna array
Service quality
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Description
Summary:Cooperation among mobile users (MUs) in a wireless network can be very useful to reduce the total radiated power necessary to insure the delivery of the information with the desired quality of service. A systematic framework for achieving such a gain consists in making the cooperating nodes act as the antennas of a virtual transmit array, operating according to a distributed space-time coding (DSTC) strategy. However, cooperation implies the allocation of dedicated resources, typically power and time slots, for the exchange of data between source and intermediate nodes (relays). It is then necessary to design the system properly to make possible a final net gain, taking into account all resources involved in the communication. In this paper, we consider regenerative relays and we analyze the effect of intermediate decision errors at the relay nodes. We derive the optimal maximum-likelihood (ML) detector, at the final destination, in case of binary phase-shift keying (BPSK) transmission, and a suboptimal scalar detector, whose bit-error rate (BER) is expressed in (approximate) closed form. Since with DSTC the transmit antennas are not colocated, we show how to allocate the power among source and relay terminals in order to minimize the average BER at the final destination. Finally, we compare alternative cooperation and decoding strategies.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2005.853883