Irfan,
epsilon: Simulates Sampling-Clock-Mismatch. It uses rational-resampling for interpolation/decimation. value=1 means no-mismatch i.e. in-samp-rate=out-samp-rate. value=1.00001 means receiver clock is fast(sample added). value=0.9999 means rcvr clock is slow (sample-skipped). useful for testing Timing-Synch. Algo's
taps: Filter taps to simulate channel-response. Useful for testing Equalization Algo's
frequency offset: Simulates Tx/Rx-Freq Mismatch. Useful for testing Freq-Synch. Algo's
-Adeel