A Single Bit Over a Time Diversity Channel
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چکیده
We have seen that the communication (even with coding) over a slow fading flat wireless channel has very poor reliability. This is because there is a significant probability that the channel is in outage and this event dominates the total error event (which also include the effect of additive noise). The key to improving the reliability of reception (and this is really required for wireless systems to work as desired in practice) is to reduce the chance that the channel is in outage. This is done by communicating over “different” channels and the name of the game is to harness the diversity available in the wireless channel. There are three main types: temporal, frequency and antennas. We will see each one over separate lectures, starting time diversity.
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