Exploiting interference alignment for sum rate enhancement in D2D-enabled cellular networks

Spectrally-efficient and low-latency support of local media services is expected to be provided by enabling underlay direct Device-to-Device (D2D) communication mode in future cellular networks. Interference Alignment (IA) can enhance the capacity of a wireless network by providing more degrees of f...

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Bibliographic Details
Main Authors: Elkotby, H. E., Elsayed, K. M. F., Ismail, M. H.
Format: Conference Proceeding
Language:English
Subjects:
Bit error rate
Clustering algorithms
D2D
Interference
Interference Alignment
Receivers
Resource management
Throughput
Transmitters
Vectors
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Summary:Spectrally-efficient and low-latency support of local media services is expected to be provided by enabling underlay direct Device-to-Device (D2D) communication mode in future cellular networks. Interference Alignment (IA) can enhance the capacity of a wireless network by providing more degrees of freedom. In this paper, we propose using IA techniques in a D2D underlay network to enhance spectral efficiency. We compare IA transmission and traditional point-to-point (P2P) transmission from the Bit-Error-Rate (BER) and sum-rate points of view. Furthermore, we propose three grouping schemes for the D2D users into groups of 3-pairs such that IA can be applied using a limited number of signal extensions. Results demonstrate that although traditional P2P transmission can achieve better BER performance; IA transmission is still able to achieve gains in the sum rate. Also, system simulations show that the cell total D2D sum rate can be improved using IA. A gain of up to 31.8% is shown to be attainable at a reasonable transmit signal power level.
ISSN:1525-3511
1558-2612
DOI:10.1109/WCNC.2012.6214042