Equalization of Linear Time-Dispersive Intra- and Interbuilding Radio DataChannels

摘要

The concept of the wireless in-building communication systems has introduced a'new' medium, namely the indoor radio propagation channel, which can be used for interconnecting terminals and computers in Local Area Networks. Experimental studies have shown that indoor radiowave propagation can be characterized by large propagation losses, multipath, slow time variations, and fading. Some computer applications require very high signaling rates. When the data rate is increased, the multipath propagation in the indoor channel causes intersymbol interference in the detection process, thus adversely affecting the system performance. A common approach to combat multipath fading, and hence intersymbol interference, is to use and adaptive equalizer. This thesis considers a 4-Quadrature Amplitude Modulation communication system with Least Mean Square symbol-spaced linear and Least Mean Square fractionally-spaced decision-feedback adaptive equalizer at the receiver.