Improving the performance of mobile broadcasting systems using multiple base stations and distributed space-time codes

TitleImproving the performance of mobile broadcasting systems using multiple base stations and distributed space-time codes
Publication TypeJournal Article
Year of Publication2007
AuthorsMietzner, J., and P. A. Hoeher
JournalIET Communications
Volume1
Pagination348–353
ISSN1751-8628
Abstract

Error performance of distributed space-time codes used for mobile broadcasting systems consisting of multiple base stations is analysed. The base stations are assumed to operate in a simulcast anode, that is they simultaneously transmit the same message using the same carrier frequency. Mobile users within the intersection of the coverage areas, thus, enjoy a small probability of shadowing and a high probability of at least one line-of-sight (LOS) link. In effect, the base stations establish a virtual multiple-antenna system. The use of a distributed space-time code offers an additional spatial diversity gain. Considering a single user with a fixed (random) position, the impact of shadowing and LOS components on the error performance of the system is analysed and compared with a conventional multiple-antenna system with co-located transmit antennas. Specifically, the analysis shows that already a single LOS link significantly improves the overall system performance. In the case of shadowing, huge diversity gains are obtained in the distributed system. In a system with co-located transmitters, however, the performance improvements compared with a single-antenna system are rather small, when shadowing is taken into account. Altogether, it can be concluded that systems with distributed transmitters are typically superior to conventional multiple-antenna systems (due to macroscopic diversity), and that distributed space-time codes are superior to conventional simulcasting (due to microscopic diversity).

URLhttp://dx.doi.org/10.1049/iet-com:20050185
DOI10.1049/iet-com:20050185

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