We provide a general overview of the recent development on the constrained group decoder (CGD) for interference channels.We first consider the CGD for a simple system of interference channels with no feedback from the receivers to the transmitters,where the transmitters employ fixed-rate channel codes and modulation schemes.We provide simulation results to show that, compared with the interference suppression scheme that maximizes the signal-to-interference-plus-noise ratio(SINR) at the receiver and the one that minimizes the interference leakage to the signal subspace (i.e., interference alignment),the group decoder offers an signal-to-noise ratio (SNR) gain of around $5$dBat the outage probability $3imes10^{-2}$ and bit error rate (BER) $2imes10^{-3}$.We then discuss the application of the CGD to more sophisticated systems that allow feedback from receivers to transmitters.More specifically, we review the recently developed practical coding schemes for the constrained partial group decoder (CPGD)and the group decoder for the multi-relay-assisted interference channels.Compared with the interference alignment approach, the group decoding paradigm not only provides substantial performance gains,but also eliminates the need of feeding back the channel state information of all users to the transmitters,thus significantly reducing the system signaling overhead
In this study, the authors propose a transceiver system for large-scale multiple-input-multiple-output (MIMO) (LSM) wireless communications. The authors present the main challenges facing such LSM system, also, they find solutions for those problems. The transmitters in this proposed downlink system uses a simple fair user scheduling based on limited-feedback algorithm with basic random precodeing algorithm. On the other side, receivers employ constrained partial group decoder to detect their desired signals. Simulation is used to evaluate sum-rate performance of this LSM downlink system against the total number of users and signal-to-noise ratio, using different number of scheduled users and with various group sizes of jointly decoded users. Numerical results interestingly show an encouraging performance for the proposed transceiver system in this study to be considered as a candidate scheme for LSM communication systems.
This paper presented the possibility of performance improvement of blind adaptive beamforming algorithms using a new proposed pre-filtering technique. We will introduce the idea of this technique with the necessary mathematical derivation. Simulation results of this technique show that there is a significant improvement in beam pattern characteristics with increasing in Signal-toInterference Ratio (SIR) level over conventional blind algorithms. 12
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