The IEEE 802.11ax amendment has defined compression schemes to transmit orthogonal pilots in order to reduce the overhead to acquire the channel state information (CSI) necessary to the operation of multiple-input multiple-output (MIMO) transceivers. This paper analyzes the effects of high-efficiency long training fields (HE-LTF) transmission modes on the performance of 802.11ax MIMO transceivers impaired with hardware impairments (carrier frequency offset, in-phase and quadrature imbalance and phase noise). We have concluded that it is necessary to develop smart algorithms to define on-flight the optimal HE-LTF transmission mode since the use of compression techniques, besides reducing the training overhead, it can also improve the system performance in some configurations due to denoising effects of the linear interpolation procedure.
IEEE 802.11ax: Analyses of MIMO Channel Sounding Modes with Hardware Impairments
2019-09-01
528126 byte
Conference paper
Electronic Resource
English