Interval for preventing intersymbol interference

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Reference no: EM13864774

Problem 1:

In a certain wireless channel, the delay spread TD=10µsec and the maximum Doppler spread fd=0.2 kHz. The maximum propagation attenuation is 40dB.

The total power available at the transmitter is 1.08Watt. (Hint: i.e., the minimum received signal power is 0.108 mWatt.) The total bandwidth is 2 MHz For the OFDM receiver, the received noise power density is 0.1µWatts/MHz. The total intercarrier interference power (for all subcarriers combined) is (fdT)2 mWatts where T is the OFDM symbol duration.

a.) What is the minimum guard time interval for preventing intersymbol interference?

b.) What is the maximum data rate (BPSK signaling) where minimum SINR is 40 (in linear scale)?

Problem 2:

Let the original symbol duration T be 0.1msec and the number of subcarrier is 16 (k=0:15). Guard time TG for cyclic prefix is 0.02msec. The combined symbol period Ts becomes 0.12msec. Let the OFDM signal go though a time varying channel with the following 2-path model:

775_original symbol duration.jpg

a.) For f1=200Hz and f2=-200Hz, find the ICIm at the 8th carrier (k=7) for m=0,1,2, ...,6.

b.) For f1=600Hz and f2=-600Hz, find the ICIm at the 8th carrier (k=7) for m=0,1,2, ...,6

Reference no: EM13864774

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