| Autor: |
U. Kiran, K. Rajesh Reddy, Ch. Suresh Kumar, G.Vamshi Krishna |
| Rok vydání: |
2012 |
| Předmět: |
|
| Zdroj: |
International Journal of Communication Networks and Security. :29-33 |
| ISSN: |
2231-1882 |
| Popis: |
A multiple transmit antenna, single receive antenna (per receiver) downlink channel with limited channel feedback is considered. Given a constraint on the total system-wide channel feedback, the following question is considered: is it preferable to get low-rate feedback from a large number of receivers or to receive high-rate/high-quality feedback from a smaller number of (randomly selected) receivers. Acquiring feedback from many users allows multi-user diversity to be exploited, while highrate feedback allows for very precise selection of beamforming directions. It is shown that systems in which a limited number of users feedback high-rate channel information significantly outperform low-rate/many user systems. The marginal benefit of channel feedback is very significant up to the point where the CSI is essentially perfect. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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