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Abstract
Relay nodes are the main players of cooperative networks that used to improve the system performance and to offer virtual multiple antennas for limited antenna devices in a multi-user environment. However, employing relaying strategies requires considerable resources at the relay side and places a large burden on the relay helping node especially when considering the power consumption. Partial detection at the relay is one strategy that reduces the computational load and power consumption. In this paper, we propose a new 2-D Adaptive K-Best Sphere Decoder (2-D AKBSD) for partial detection to be used MISO relays in cooperative networks. Simulation results show that 2-D AKBSD is capable of improving the system performance and also reduces its complexity.
Highlights
Cooperative networks enhance the performance of the communication system by increasing the transmission data rate making use of the cooperative diversity property
The relay consumed power is increased causing a problem in many cases, e.g. an idle mobile MIMO user may not choose to operate as a relay in Decode and Forward” (DF) mode due to its limited battery power
For conventional Full Detect and Forward (FDF), both R and D nodes performs full detection of all the symbols using regular K-Best Sphere Decoder (KBSD) while for Partial Detection (PD), the R node applies the 2-D AKBSD to detect part of the transmitted symbols, this part is determined based on the S-R link capacity, and inТ2, R transmits the detected signals to the D node which uses 2-D AKBSD with horizontal adaptation only to retrieve the original signals
Summary
Cooperative networks enhance the performance of the communication system by increasing the transmission data rate making use of the cooperative diversity property It removes the need for installing multiple antennas at the network nodes which may be in many cases impractical due to size, hardware complexity and/or power limitations [1]-[6]. Partial Detection (PD) at the relay can reduce the complexity of the decoding by detecting only part of the received signal, depending on its available resources, forwarding it. The destination combines both the source signal and the partial relay signal to recover the transmitted signal [8].
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