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

J. Mietzner; P.A. Hoeher

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

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

Author(s): J. Mietzner and P.A. Hoeher
DOI: 10.1049/iet-com:20050185

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Author(s): J. Mietzner ¹ and P.A. Hoeher ²
- Affiliations: 1: Department of Electrical and Computer Engineering, Communication Theory Group, University of British Columbia, Vancouver, Canada
  2: Information and Coding Theory Lab (ICT), Faculty of Engineering, University of Kiel, Germany
Source: Volume 1, Issue 3, June 2007, p. 348 – 353
DOI: 10.1049/iet-com:20050185 , Print ISSN 1751-8628, Online ISSN 1751-8636

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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 mode, 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).

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

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