Radio Resource Allocation for Multicarrier-Low Density Spreading Multiple Access
Al-Imari, M, Imran, M and Xiao, P (2016) Radio Resource Allocation for Multicarrier-Low Density Spreading Multiple Access IEEE Transactions on Vehicular Technology.
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Multicarrier-low density spreading multiple access (MC-LDSMA) is a promising multiple access technique that enables near optimum multiuser detection. In MC-LDSMA, each user’s symbol spread on a small set of subcarriers, and each subcarrier is shared by multiple users. The unique structure of MC-LDSMA makes the radio resource allocation more challenging comparing to some well-known multiple access techniques. In this paper, we study the radio resource allocation for single-cell MC-LDSMA system. Firstly, we consider the single-user case, and derive the optimal power allocation and subcarriers partitioning schemes. Then, by capitalizing on the optimal power allocation of the Gaussian multiple access channel, we provide an optimal solution for MC-LDSMA that maximizes the users’ weighted sum-rate under relaxed constraints. Due to the prohibitive complexity of the optimal solution, suboptimal algorithms are proposed based on the guidelines inferred by the optimal solution. The performance of the proposed algorithms and the effect of subcarrier loading and spreading are evaluated through Monte Carlo simulations. Numerical results show that the proposed algorithms significantly outperform conventional static resource allocation, and MC-LDSMA can improve the system performance in terms of spectral efficiency and fairness in comparison with OFDMA.
|Subjects :||Electronic Engineering|
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering|
|Date :||9 June 2016|
|Identification Number :||10.1109/TVT.2016.2579168|
|Copyright Disclaimer :||Copyright 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.|
|Related URLs :|
|Depositing User :||Symplectic Elements|
|Date Deposited :||13 Jun 2016 09:23|
|Last Modified :||14 Jun 2016 11:49|
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