Residual self‐interference suppression guided resource allocation for full‐duplex orthogonal frequency division multiple access system

IET Communications(2020)

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In a wideband full‐duplex system, the residual self‐interference (SI) channel exhibits significant frequency selective fading characteristics after radio frequency SI cancellation. Resource allocation using the difference between the signal channel and the residual SI channel is a new method of suppressing residual SI and increasing system capacity. In this work, the residual SI channel and the user uplink channel are modelled as multi‐path frequency selective fading channels that satisfy the Rayleigh distribution. To improve system capacity, the authors propose to allocate the spectrum resource avoiding occupation of subcarriers with high residual SI, while guaranteeing a fair subcarrier assignment (SA) and power allocation (PA). A sum rate of uplink maximisation is formulated, and an algorithmic solution is developed to effectively conduct SA and PA. Numerical results demonstrate the effectiveness of the scheme in increasing system capacity and suppressing residual SI.
fading channels,frequency division multiple access,radiofrequency interference,radio transceivers,resource allocation,OFDM modulation,interference suppression,residual SI channel,user uplink channel,multipath frequency selective fading channels,high residual SI,power allocation,residual self‐interference suppression guided resource allocation,full‐duplex orthogonal frequency division multiple access system,wideband full‐duplex system,radio frequency SI cancellation,signal channel,residual self‐interference channel,uplink maximisatio sum rate,fair subcarrier assignmen
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