Indoor Optical Wireless Lan Mac Protocol And Performance Analysis

Indoor wireless optical local area network (WLAN) has advantages of wide bandwidth, strong anti-jamming and good handiness. It is the best resolution for future communications: mobility, personality, and multimedia application, and will have wide applying foreground.How to use the network bandwidth resource fairly and effectively is key to QoS guarantee. So it is of great importance to study MAC protocol.In the paper, diffuse channel characteristics is studied, multiple dispersion and background noise is detailedly analyzed, based on which the network buildup and protocol structure are analyzed.Aiming at the wireless optical channel and operation characteristics, Carrier Sense Multiple Access/Collision Avoidance(CSMA/CA) MAC protocol is put forward taking into account the bit error rate(BER). This paper studies the protocol theory, access mechanism detailedly, and models the throughput performance, simulates and analyzes the performance. The paper analyzes the performance influence factors such as BER, transmit probability, number of the terminals, initial windows, retry limit and so on. This research is a breakthrough for study of relationship of MAC and PHY, and is worthy of reference.Besides, this paper studies the Wireless Optical Code Division Multiple Access (W-OCDMA) technology whereas its anti-jamming, security and asynchronism. Based on the W-OCDMA communication technology, we analyzes OCDMA MAC protocol, studies the protocol theory, access mechanism in detail, and models the throughput performance, simulates and analyzes the performance.A Fast Frequency Hopping(FFH)W-OCDMA system experiment is developed to validate the OCDMA encoder/decoder technologies. At the same time, the factor influencing optical CDMA system is experimented and validated. It lays foundation to study OCDMA communication system further.