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1992). To this end, the distance between the antenna elements should preferably be larger than the coherence distance of the channel. Selection diversity is an effective way to mitigate multipath fading and is frequently applied in commercial systems. A second non-adaptive combining algorithm is the switched beam algorithm. It employs a beamformer matrix that forms multiple nonadaptive beams and selects the beam -or several beams- with the best signal quality (Butler and Lowe, 1961). Unlike selection diversity, this technique is based on beamforming and it hence requires a small inter- element distance.

It turns out that the gain obtained by selection diversity remains important, even when the correlation becomes very high. Moreover, the extraction of the full diversity order is maintained. Maximum ratio combining A maximum ratio combining (MRC) receiver weighs the signals that it receives at each diversity branch a with the magnitude of the channel response at that branch and then coherently combines the obtained signals. It is the optimal diversity combiner when no interference is present. Note that this optimality comes at the expense of acquiring knowledge of all channel responses.

These channel responses can then be included in Monte-Carlo simulations to assess the performance of a complete communication system in such environment. However, it is also usefull to derive analytical expressions for a system’s performance. For instance, such expressions can be used to speed up simulations by semi-analytical techniques, to provide fundamental performance bounds, to extract key trends, or just to double-check simulation results. To this end, a statistical channel model is needed that accurately describes the characteristics of the indoor propagation channel.

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CCIE Security 1.1 Knet Hires


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