|Jan30-13, 11:41 PM||#1|
Diversity gain in Wireless Communications
What is meant by achieving "full diversity gain over Rayleigh fading channel"?
|Jan31-13, 09:34 PM||#2|
crixus: you have not provided the context for this quote, the type of system involved, nor even a complete sentence, so my response will be very generic.
A Rayleigh channel is a communications channel (path) consisting of a large number of multipath reflections of random amplitude and phase. Temporal fluctuations in the received signal strength have a Rayleigh statistical distribution. It is seen in an urban area when the transmitter is a cellphone that is moving (walking or traveling in a car), for example.
Diversity is a method to either mitigate or exploit the multipath propagation. The simplest form is switching from an antenna whose signal has temporarily faded to one elsewhere that is receiving a strong signal. There are more sophisticated electronic and signal coding diversity approaches, as you might imagine. In a MIMO system, the independent propagation paths are exploited so that (conceptually, anyway) each carries a different data stream, increasing system capacity and data throughput. Indoor IEEE 802.16 wireless LAN computer routers work this way. The gain obtained in all these cases is called diversity gain.
|Feb1-13, 02:34 AM||#3|
Thanks for replying. In fact I was able to figure out. Like if we have a MISO system with each antenna transmitting same symbol then diversity gain would be 1. However if I have multiple receive antennas then diversity gain would be L = no of independent fading paths. Thus "full diversity gain" is achieved in the latter case.
|Similar Threads for: Diversity gain in Wireless Communications|
|gain bandwidth product of unity gain opamp||Electrical Engineering||10|
|Confusion in Power gain and voltage gain in decibels...||Electrical Engineering||2|
|Ronja - D.I.Y. wireless communications||Computing & Technology||3|
|wireless communications and k factors||Electrical Engineering||1|
|Wireless Communications||Introductory Physics Homework||0|