|
For Full-Text PDF, please login, if you are a member of IEICE,
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
|
Stochastic Method of Determining Substream Modulation Levels for MIMO Eigenbeam Space Division Multiplexing
Satoshi TAKAHASHI Chang-Jun AHN Hiroshi HARADA
Publication
IEICE TRANSACTIONS on Communications
Vol.E89-B
No.1
pp.142-149 Publication Date: 2006/01/01 Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.1.142 Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: mobile radio propagation, adaptive modulation, multipath environments, ray tracing, MIMO, E-SDM,
Full Text: PDF(464.2KB)>>
Summary:
Multiple-input multiple-output (MIMO) eigenbeam space division multiplexing that uses adaptive modulations for substreams is a promising technology for improving transmission capacity. A fundamental drawback of this approach is that the modulation levels determined from the carrier-to-noise ratio at each substream are sometimes overly optimistic so the use of these modulation levels results in transmission errors and diminished transmission performance. A novel method of determining substream modulation levels is proposed that alleviates this degradation. In the proposed method, the expected bit error rates for possible modulations of each substream are calculated from delay profiles. Simulation results indicate that transmission capacity is improved by 30% using the new method compared with the conventional method.
|
|
|