Fundamentals for a Pragmatic MIMO Performance Evaluation
نویسنده
چکیده
The user’s experience of a mobile communication system entirely depends on the performance of the bidirectional radio link between the base station (BS) and the handset. Each mobile network operator creates a system of linked BSs located to provide coverage of as large a physical area as possible. While the BS will typically be equipped with a relatively large high-gain antenna and a transmitter cable for delivering some tens of watts of radio frequency (RF) power, the handset relies on an antenna whose dimensions are severely constrained by those of the handset in which it is fitted, with typical maximum effective radiated power of 1 watt. With this said, the communication link quality, and hence the user’s experience, can mainly get as good as the handset antenna performance. Multiple Input Multiple Output (MIMO) has promised the potential for improved data rates and signal quality (Foschini, 1998). The promised improvement in the system’s performance comes at the expense of added challenges, especially from the perspective of handset antenna design. An important aspect in the process of designing a multi-antenna handset is the proper evaluation of its performance. Although the antenna itself can be seen as a deterministic element, its performance becomes random once operated in a realistic, random, environment and in the presence of the operating user. The key questions in ensuring performance are: What are the parameters that need attention when designing the multi-antenna system and how should the evaluation of this system be done? In this chapter the author discusses some aspects that are fundamental for a pragmatic evaluation of multi-antenna system. This becomes especially important to realize at the early stages of a design process when the multi-antenna system is evaluated entirely or partially through simulations.
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