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Hi
In most case, Time varing channels, is modeled with low pass FIR filter with time varing coefficients. so shape and cutoff frequency of channel are time varing. it is useful in equlization.
Time varying channel is often characterized by its Doppler spectrum. Intuitively, the higher the Doppler shift (caused by higher mobility), the faster channel changes.
However, time varying nature of channel, characterized by Doppler spectrum, does not lend itself to analysis. A good simplified model is finite state Markov channel (FSMC). FSMC is widely used in acadimia.
A good survey of FSMC can be found in Goldsmith's book, Section 3.2.4.
**broken link removed**
can you help me , i intend to simulate a PSD estimator using the "basis expansion model" .please send me some matlab codes which tells how basis expansion model actually works i would be very grateful.
I only know that the FIR is changing continuously over the time. But I need more obvious explanation about its difference with non time varying channel. Could someone help me?
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