The wireless local area networks (WLANs) systems are suffering from higher chance of interference due to the contention based transmitting opportunity. In the IEEE 802.11ac and 802.11ax standards, the transmitting bandwidth can be as large as 80 MHz and 160 MHz. Therefore, in case of overlapping basic service set (OBSS) scenario, partial-band interference may be present for wide-band transmission and affects one or more 20-MHz sub-bands. This subband interference can cause severe performance degradation. Moreover, because the OBSS transmissions are not synchronized, interference power may vary through a data packet. In this paper, we design a frequency-domain signal whitening algorithm according to the interference whitening (IW) factors per 20-MHz-sub-band calculated based on a noise-and-interference variance (NIVar). Then we design the method to update the IW factor for each symbol. Simulation results indicate that the packet error rate (PER) is improved by several dBs in high signal to interference ratio (SINR) cases. In low SINR cases, our IW algorithm is removing the high tail of the PER curve and saving the entire transmission.
Interference Whitening per sub-band in WLANs
2020-11-01
1816972 byte
Conference paper
Electronic Resource
English
Business-WLANs entdecken Multimedia
IuD Bahn | 2008
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