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Table 1 Channel structures in different mobile communication systems

From: Variable-step-size based sparse adaptive filtering algorithm for channel estimation in broadband wireless communication systems

Generations of mobile communication systems 2G cellular (IS-95) 3G cellular (WCDMA) 4G/5G cellular (LTE-Advanced~)
Transmission bandwidth 1.23 MHz 10 MHz 20 ~ 100 MHz
Time delay spread (assume) 0.4 μs 0.4 μs 0.4 μs
Sampling channel length 1 8 16 ~ 80
Number of nonzero taps 1 4 6
Channel model Dense Approximate sparse Sparse