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"Non-Orthogonal Multiple Access in Multi-Cell Networks: Theory, Performance, and Practical Challenges," (with Wonjae Shin, Mojtaba Vaezi, Byungju Lee, David J. Love and Jungwoo Lee).
The core mechanism of EDCA is carrier sense multiple access with collision avoidance (CSMA/CA), which controls multiple access in a distributed manner.
Most beyond-3G communication systems employ orthogonal multiple access in uplink (SC-FDMA in LTE and OFDMA in WiMAX), and additionally rely on frequency-selective RRM (scheduling) algorithms.
On the other hand, space-division multiple access (SDMA) is a recognized technique to support multiple access in the downlink of a multi-user system.
The task of the scheduler in a cellular network is to organize multiple access in the cell such that system performance is maximized.
These two exploit the flexibility of OFDM to also provide multiple access in time and frequency through orthogonal frequency division multiple access (OFDMA).
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In [14], the authors proposed practical sub-channel and power allocation algorithms for a two-hop DF relay scheme to improve the achievable rate of an orthogonal frequency division multiple access PLC in-home network.
We hope that the papers published in this Special Issue will inspire and promote further research in Multiple Access Communications in Future-Generation Wireless Networks.
In [6], a game theoretic approach in multirate code-division multiple access system, in order to maximize the total system throughput by means of power control is presented.
This phenomenon occurs in all multiple access methods in fading channels and is usually solved at a high level protocol.
The formulation in [1] is extended to broadcast channels in [2,3] and to a multiple access channel in [4].
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