Optimal Chunk Based Resource Allocation For Ofdma Systems With Mulitple Ber Requirements
Download and Read Optimal Chunk Based Resource Allocation For Ofdma Systems With Mulitple Ber Requirements full books in PDF, ePUB, and Kindle. Read online free Optimal Chunk Based Resource Allocation For Ofdma Systems With Mulitple Ber Requirements ebook anywhere anytime directly on your device. We cannot guarantee that every ebooks is available!
Optimal Chunk-based Resource Allocation for OFDMA Systems with Mulitple BER Requirements
Author | : Tianzhou He |
Publisher | : |
Total Pages | : 89 |
Release | : 2014 |
Genre | : Adaptive signal processing |
ISBN | : |
Download Optimal Chunk-based Resource Allocation for OFDMA Systems with Mulitple BER Requirements Book in PDF, Epub and Kindle
In wireless orthogonal frequency division multiple-access (OFDMA) standards, subcarriers are grouped into chunks and a chunk of subcarriers is made as the minimum allocation unit for subcarrier allocation. We investigate the chunk-based resource allocation for OFDMA downlink, where data streams contain packets with diverse bit-errorrate (BER) requirements. Supposing that adaptive transmissions are based on a number of discrete modulation and coding modes, we derive the optimal resource allocation scheme that maximizes the weighted sum of average user rates under the multiple BER and total power constraints. With proper formulation, the relevant optimization problem is cast as an integer linear program (ILP). We can rigorously prove that the zero duality gap holds for the formulated ILP and its dual problem. Furthermore, it is shown that the optimal strategy for this problem can be obtained through Lagrange dual-based gradient iterations with fast convergence and low computational complexity per iteration. Relying on the stochastic optimization tools, we further develop a novel on-line algorithm capable of dynamically learning the underlying channel distribution and asymptotically approaching the optimal strategy without knowledge of intended wireless channels a priori. In addition, we extend the proposed approach to maximizing the a-fair utility functions of average user rates, and show that such a utility maximization can nicely balance the trade-off between the total throughput and fairness among users. Likewise, the optimal solution for the primal problem can be yielded through solving its dual problem. Numerical results are provided to gauge the performance of the proposed schemes and attain our benchmarks, followed by conclusions and later on the discussion of future directions in this field.
Optimal Chunk-based Resource Allocation for OFDMA Systems with Mulitple BER Requirements Related Books
Pages: 89
Pages: 104
Pages: 126
Pages: 374
Pages: 209