Efficient utilization of wideband spectrum and performance analysis for VHT WLANs

Very high throughput (VHT) WLANs have attracted extensive attentions for achieving transmission rates over 1 GHz for the 5GHz band and support the MU-MIMO transmission mechanism and maximum 160MHz bandwidth, which can be obtained only less than four bands in licensed frequency spectrum, thus the research of the efficient utilization of the spectrum is a significant direction of the WLANs. Therefore, the optimal band selection can be used to primary channel selection in licensed spectrum and the paper gives the performance analysis of throughput gains increased by the diversity gains brought by the selection of frequency bands, and obtains the relations between the throughput gains and the frequency band number under Nakagami channel, which is more practical than the Rayleigh channel in WLAN environments. Finally, the paper verifies the performance analysis through simulations, which present the correctness and efficiency of the scheme proposed.