Name
Abstract | ||
|---|---|---|
In this paper, a downlink communication system, in which a Base Station (BS) equipped with M antennas communicates with N users each equipped with K receive antennas is considered. We study the minimum required amount of feedback at the BS, in order to achieve the maximum sum-rate capacity. First, we define the amount of feedback as the average number of users who send information to the BS. In the asymptotic case of N -> infinity, we show that with finite amount of feedback, it is not possible to achieve the maximum sum-rate. Indeed, in order to reduce the gap between the achieve sum-rate and the optimum value to zero, a minimum feedback of In In In N is asymptotically necessary. Then, we consider a practical scenario, in which the amount of feedback is defined as the average number of bits which is sent to the BS. We show that to achieve the maximum sum-rate, infinite amount of feedback is required. Moreover, the minimum amount of feedback, in order to reduce the gap to the optimum sum-rate to zero, scales as Theta (ln ln ln N), which is achievable by the random beam-forming scheme proposed in [12]. |
Year | DOI | Venue |
|---|---|---|
2007 | 10.1109/ISIT.2006.262038 | 2006 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY, VOLS 1-6, PROCEEDINGS |
Keywords | Field | DocType |
feedback,degradation,channel capacity,broadcasting,base station,communication system,downlink,signal to noise ratio,mimo,throughput,transmitters | Broadcasting,Base station,Computer science,Control theory,Signal-to-noise ratio,MIMO,Communications system,Throughput,Channel capacity,Telecommunications link | Journal |
Volume | Citations | PageRank |
abs/cs/070 | 11 | 0.81 |
References | Authors | |
21 | 2 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Alireza Bayesteh | 1 | 337 | 24.21 |
| Amir K. Khandani | 2 | 674 | 75.15 |