Abstract
Device-to-device (D2D) communication is a technique for direct communication between devices without going through a base station or other infrastructure. D2D communication technology has the advantages of improving spectrum efficiency and reducing transmission delay and transmission power. In D2D communication systems, orthogonal frequency-division multiple access (OFDMA) is widely used to maintain similarities with cellular communication systems and to secure transmission distance. OFDMA allows flexible and efficient use of frequency resources by allocating sub-channels independent to each user. In this paper, we consider a D2D overlay system that uses different sub-channels for cellular and D2D communications. In theory, the signals on different sub-channels of an OFDMA system are orthogonal and not interfered with each other. However, in a D2D communication system, which operates in a distributed manner, there is non-negligible interference from other sub-channels because of in-band emissions. In this paper, we address the performance degradation resulting from the interference from other sub-channels for OFDMA-based D2D group-casting systems. We consider three different scenarios of D2D relay, and we find the relay position that minimizes the outage probability. The simulation and analytical results show that the optimal location of a relay can be considerably different according to the source location and the target scenario.
Highlights
There is growing interest in device-to-device (D2D) communication technologies capable of directly transmitting data between devices without going through a base station or other infrastructure [1,2,3,4,5,6]
We considered a circular cell with radius 100 m and assumed 25 sub-channels: one was the target sub-channel, and the other 24 sub-channels produced the other-channel interferences to the target sub-channel
In the target sub-channel, there was one D2D group with 30 receivers randomly distributed in a uniform distribution over a circular area of radius 30 m
Summary
There is growing interest in device-to-device (D2D) communication technologies capable of directly transmitting data between devices without going through a base station or other infrastructure [1,2,3,4,5,6]. We consider a D2D overlay system that uses different sub-channels for cellular and D2D communications. This work deals with the interference from other sub-channels in OFDMA-based D2D systems This journal article extends the conference paper [31] by considering several different scenarios of D2D configurations, while the preliminary version of this paper focused on a single limited scenario with limited assumptions. In OFDMA-based D2D systems, transmission through a relay should consider the interference from other sub-channels, but most studies do not take care of the interference. We consider relay positions in a D2D group to minimize the outage probability from the interference from other sub-channels while ignoring other performance-degradation effects such as collisions, fading, or co-channel interference.
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