Table 1 Channel structures in different mobile 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 |