qpsk: need urgent help please.

[shubhs9]

qpsk: need help please.

hello,

In my code for qpsk i have passed the input signal through an fir filter having 6 coefficients.. the i/p signal was convolved with h. this leads to degradation of the signal.

Now i have been asked to remove the effect of this channel on the performance.

Suppose someone gave you the channel coefficients(in this case i know), how would i be able to remove the effect?

could someone please help me.

i was thinking of using z transforms but i dunno how to implement it..

please help me out.

regards,
shubrodeep

 

[zorro]

qpsk: need help please.

Hi shubrodeep,

You need an equalizer able to remove the intersymbol interference created by the filter.
The equalizer makes the folded spectrum (aproximately) uniform in amplitude and phase. Look at texts on digital communications, especially these terms: "intersymbol interference", "Nyquist criterion", "equalization",
Regards

Z

 

[shubhs9]

hey thanks a lot...