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Channel modeling for wireless communication

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vreg

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Hi,

I have heard that the first step in setting up any form of communication system is modeling of the channel that you are using...

Can someone explain what exactly is channel modeling and how is it done.

Also what are TAPS?
 

greygoo2012

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Hi,

I have heard that the first step in setting up any form of communication system is modeling of the channel that you are using...

Can someone explain what exactly is channel modeling and how is it done.

Also what are TAPS?

Channel is the medium through which signals propagate from a transmitter to a receiver. If there is an ideal channel, the receiver receives the exact same signal that the transmitter transmits. However, no channel is ideal. Channel characteristics change with time and/or frequency. Rarely, channels might also be constant over time and frequency. Either way, there is some attenuation/delay introduced by the channel. Modelling the channel is to find out how much attenuation and delay has been introduced by the channel on the signal.

Taps are used in modelling an LTI channel as a filter. The number of taps and the weight of each tap typically indicates how much delay and attenuation is introduced by the channel, respectively. The number of taps also depends on the sampling frequency of the transceiver system.

For a good tutorial, you could look at these lecture notes - https://users.ece.gatech.edu/stuber/4601/2014fall-lectures.html
 
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