Multipath occurs when a radio signal is split into two or more signals causing the receiving antenna to receive multiple copies of the same signal. The radio signal can be split by obstacles such as walls, chairs, tables and other objects. As the signal bounces off an object it causes a longer path to the receiver. Some signals may bounce off several objects before reaching the receiver. The longer this path, the greater the amount of delay.
As radio signals are delayed they reach the receiving antenna at different times, sometimes overlapping. The receiver becomes confused by the signals and is unable to interpret them correctly which causes data errors requiring retransmission of the signal. Performance can be significantly reduced by the delayed signals and retransmissions.
This applies to: