Name
Abstract | ||
|---|---|---|
This paper considers broadcast channels with L antennas at the base station and m single-antenna users, where L and m are typically of the same order. We assume that only partial channel state information is available at the base station through a finite rate feedback. Our key observation is that the optimal number of on-users (users turned on), say s, is a function of signal-to-noise ratio (SNR) and feedback rate. In support of this, an asymptotic analysis is employed where L, m and the feedback rate approach infinity linearly. We derive the asymptotic optimal feedback strategy as well as a realistic criterion to decide which users should be turned on. The corresponding asymptotic throughput per antenna, which we define as the spatial efficiency, turns out to be a function of the number of on-users s, and therefore s must be chosen appropriately. Based on the asymptotics, a scheme is developed for systems with finite many antennas and users. Compared with other studies in which s is presumed constant, our scheme achieves a significant gain. Furthermore, our analysis and scheme are valid for heterogeneous systems where different users may have different path loss coefficients and feedback rates. |
Year | DOI | Venue |
|---|---|---|
2008 | 10.1109/JSAC.2008.081018 | IEEE Journal on Selected Areas in Communications |
Keywords | DocType | Volume |
l antenna,finite rate feedback,index terms— broadcast channel,feedback rate approach infinity,asymptotic analysis,spatial efficiency,feedback rate,m single-antenna user,different user,multi-antenna broadcast channel,asymptotic optimal feedback strategy,base station,different path loss coefficient,throughput,broadcasting,feedback,interference,transmitters,base stations,channel state information,signal to noise ratio | Journal | abs/0805.1442 |
Issue | ISSN | Citations |
8 | 0733-8716 | 11 |
PageRank | References | Authors |
0.68 | 7 | 4 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Wei Dai | 1 | 1390 | 91.40 |
| Youjian Liu | 2 | 605 | 49.82 |
| brian rider | 3 | 111 | 4.55 |
| Wen Gao | 4 | 11374 | 741.77 |