Space-Time Coding (Vucetic/Space-Time Coding) || Space-Time Coding Performance Analysis and Code Design

✍ Scribed by Vucetic, Branka; Yuan, Jinhong

• Publisher: John Wiley & Sons, Ltd
• Year: 2005
• Tongue: English
• Weight: 264 KB
• Edition: 1
• Category: Article
• ISBN: 0470847573
• DOI: 10.1002/047001413x.ch2

✦ Synopsis

In a cellular mobile radio environment, the surrounding objects, such as houses, building or trees, act as reflectors of radio waves. These obstacles produce reflected waves with attenuated amplitudes and phases. If a modulated signal is transmitted, multiple reflected waves of the transmitted signal will arrive at the receiving antenna from different directions with different propagation delays. These reflected waves are called multipath waves [47]. Due to the different arrival angles and times, the multipath waves at the receiver site have different phases. When they are collected by the receiver antenna at any point in space, they may combine either in a constructive or a destructive way, depending on the random phases. The sum of these multipath components forms a spatially varying standing wave field. The mobile unit moving through the multipath field will receive a signal which can vary widely in amplitude and phase. When the mobile unit is stationary, the amplitude variations in the received signal are due to the movement of surrounding objects in the radio channel. The amplitude fluctuation of the received signal is called signal fading. It is caused by the time-variant multipath characteristics of the channel.