Feedback Allocation for OFDMA Systems With Slow Frequency-Domain Scheduling

被引:1
|
作者
Ganapathy, Harish [1 ]
Banerjee, Siddhartha [1 ]
Dimitrov, Nedialko B. [2 ]
Caramanis, Constantine [1 ]
机构
[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 USA
[2] USN, Postgrad Sch, Dept Operat Res, Monterey, CA 93943 USA
关键词
Convex relaxations; limited feedback; multi-user feedback allocation; random vector quantization; sub-modular functions; throughput-optimal; uplink feedback; LIMITED FEEDBACK; RESOURCE-ALLOCATION; FAST ALGORITHMS; SUM RATE; PERFORMANCE; THROUGHPUT; OPTIMALITY; POLICIES; SCHEMES;
D O I
10.1109/TSP.2012.2218243
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We study the problem of allocating limited feedback resources across multiple users in an orthogonal-frequency-division-multiple-access downlink system with slow frequency-domain scheduling. Many flavors of slow frequency-domain scheduling (e. g., persistent scheduling, semi-persistent scheduling), that adapt user-sub-band assignments on a slower time-scale, are being considered in standards such as 3GPP Long-Term Evolution. In this paper, we develop a feedback allocation algorithm that operates in conjunction with any arbitrary slow frequency-domain scheduler with the goal of improving the throughput of the system. Given a user-sub-band assignment chosen by the scheduler, the feedback allocation algorithm involves solving a weighted sum-rate maximization at each (slow) scheduling instant. We first develop an optimal dynamic-programming-based algorithm to solve the feedback allocation problem with pseudo-polynomial complexity in the number of users and in the total feedback bit budget. We then propose two approximation algorithms with complexity further reduced, for scenarios where the problem exhibits additional structure.
引用
收藏
页码:6630 / 6640
页数:11
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