Pragmatic Downlink MIMO Cooperation with Device-to-Device Communication
Device-to-Device Communication MIMO Cooperation Message-Passing Compress-and-Forward;
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Device-to-device (D2D) communication has emerged as a key technology driving for new mobile services such as context-aware advertisement and contents distributions among the devices in proximity. In addition, D2D communication can be employed in a cellular network to improve the network performance by bypassing the traffic data or providing additional cooperative diversity channels. In this thesis, we consider a cellular network with D2D communication enabling downlink receive cooperation to improve the network throughput. The cellular network adopts either in-band overlay D2D using an orthogonal portion of the cellular spectrum for D2D links or out-of-band D2D using an additional spectrum for D2D links. The D2D links are used to relay the received signals each other by employing compress-and-forward (CF) with vector quantization (VQ), so that a virtual multiple input multiple output (MIMO) is formed from a base station (BS) to the paired devices for higher data rates. For the network, we develop a strategy for device pairing and resource sharing among the multiple devices to maximize the network throughput while balancing the desires of the devices for higher rate gains. For this purpose, we formulate the problem as a bargaining network which provides a solution satisfying 'stability' and 'balance' conditions among the devices. We also propose a message-passing (MP) algorithm which provides the solution in a distributed manner at low complexity. The performance of the cellular network with the proposed algorithm is investigated for the clustered devices in proximity. Simulation results show that the proposed algorithm provides the performance close to that achieved with the heuristic full search method. In addition, the proposed network with out-of-band D2D shows a significant throughput gain compared to the conventional network without D2D. The proposed network with inband D2D can improve the network throughput by allocating the cellular spectrum to the cellular and D2D links in an appropriate way. Clearly, the proposed D2D cooperation can be a promising technology for future cellular network to improve the network throughput.