Abstract
In this paper, a simple and practical system based on a switched diversity scheme with adaptive modulation is presented. This system provides a reduced number of channel estimation while offering the optimum spectral efficiency given by a selection diversity system. In addition, the switching threshold is easily manipulated so as to make an efficient use of the trade-off between spectral efficiency and channel estimation overhead. An extension of switched diversity into a multiuser scheduling is later also considered. This switch-based multiuser access scheme results in a lower average feedback load than that for the optimal selection-based multiuser scheme. Numerical results show that we can obtain a trade-off between spectral efficiency and the feedback load by choosing the switching threshold appropriately.
| Original language | English |
|---|---|
| Article number | 4657324 |
| Pages (from-to) | 3780-3790 |
| Number of pages | 11 |
| Journal | IEEE Transactions on Wireless Communications |
| Volume | 7 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2008 Oct |
Bibliographical note
Funding Information:Manuscript received March 14, 2007; revised June 23, 2007; accepted July 2, 2007. The associate editor coordinating the review of this paper and approving it for publication was X. Xia. This work was supported by the center for Broadband OFDM Mobile Access (BrOMA) at POSTECH through the ITRC program of the Korean MIC, supervised by IITA (IITA-2005-C1090-0502-0008). This paper was presented in part at IEEE International Symposium on Information Theory, Nice, France, June 2007 and Signal Processing on Wireless Communications Workshop, London, U.K., June 2007.
Keywords
- Adaptive modulation
- Multiuser diversity
- Switch-based multiuser scheduling
- Switched diversity
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics