In this article, self-organising interference management for optical wireless networks deployed inside an aircraft cabin is investigated. A user that has received data in a given frame and intends to continue receiving data in the next frame broadcasts a busy burst (BB) in a time-multiplexed BB slot. The tagged access point (AP) intending to reuse a resource reserved in a neighbouring cell must listen to the BB slot. Provided that channel reciprocity holds, the tagged AP infers (prior to transmission) the amount of co-channel interference (CCI) potentially caused towards the victim user in neighbouring cell. This is a vital information for an AP to decide without any central supervision whether to transmit or defer the transmission to another time or frequency slot so as to limit CCI caused to the active link to a threshold value. Simulation results demonstrate that the BB approach significantly improves both fairness and spectral efficiency in the system compared to a static resource partitioning approach.
This paper demonstrates a novel approach for motion classification and analysis using pressure sensors worn by a person. The pressure signal is analysed to search for features corresponding to the motion states, and matched against typical human walking pattern. A prototype system is developed which provides motion classification results in real-time. The motion classification results consists of the number of steps taken by the participant together with the corresponding motion state. The system distinguishes the states associated with a person travelling on a lift, walking on stairs, walking on a flat ground and rest. Data from several participants are collected in a measurement campaign using pressure sensors only, which shows a precision rate of over 90% and a recall rate between 89% and 96%, for the states associated with the movement of participant
In this paper, self-organising interference management for optical wireless networks deployed inside an aircraft cabin is investigated. A user that has successfully received data in a given frame and intends to continue receiving data in the next frame broadcasts a busy burst (BB) in a time-multiplexed BB slot. A neighbouring access point (AP) that intends to reuse the reserved resource listens to the BB slot and infers (prior to transmission) the amount of co-channel interference (CCI) it could cause towards the user that has reserved the resource, provided that channel reciprocity holds. This is a vital information for an AP to decide without any central supervision whether to transmit or to defer the transmission to another time or frequency slot so as to limit CCI caused to the active link to a threshold value. Compared to using static resource partitioning for interference coordination, the proposed approach improves the median system throughput by 17% whilst delivering roughly the same throughput at the cell-edge. Moreover, it is demonstrated that the threshold parameter can be adjusted to tradeoff aggregate system throughput for user throughput at the cell-edge.
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