Compressive Sensing Based Bayesian Sparse Channel Estimation for OFDM Communication Systems: High Performance and Low Complexity

Table 1

Channel structures in different mobile communication systems.

Generations of mobile communication systems [21]	2G cellular	3G cellular	4G/5G cellular
	(IS-95)	(WCDMA)	(LTE-Advanced~)
Transmission bandwidth	1.23 MHz	10 MHz	20 MHz~100 MHz
Time-delay spread (for example)	0.5 𝜇𝑠	0.5 𝜇𝑠	0.5 𝜇𝑠
Sampling channel length	1	10	20~100
Number of nonzero taps	1	4	2~10
Channel structure model	Dense	Approximate sparse	Sparse