Precoding: Difference between revisions

Revision as of 15:00, 15 April 2015

Revision as of 18:50, 29 April 2015

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==Precoding in Simple Words ==

Precoding is a technique which exploits transmit diversity by weighting information stream, i.e. the transmitter send the coded information to the receiver in order to the pre-knowledge of the channel. The receiver is a simple detector, such as matched filter, and does not have to know the channel side information. This technique will reduce the corrupted effect of communication channel.

For example you are sending information, s

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The received signal at receiver front-end will be, r=sh+n;

The receiver will have to know the information about h and n. It will supresssuppress the effect of n by increasing SNR but what about h? It need information about the channel, h and this will increase the complexity. The receiver, mobile units, have to be simple for many reasons like cost, size of mobile unit. So, the transmitter, base station, will do the hard work and predicts the channel.

Let call the predicted channel, h_est