物理学报Issue(12)：1-6,6.DOI:10.7498/aps.64.120701
X射线通信系统的误码率分析∗
Bit error rate analysis of X-ray communication system
摘要
Abstract
X-ray communication, which was firstly introduced by Keithe Gendreau in 2007, is potential to compete with conventional communication methods, such as microwave and laser communication, against space surroundings. As a result, a great deal of time and effort has been devoted to making the initial idea into reality in recent years. Eventually, the X-ray communication demonstration system based on the grid-controlled X-ray source and microchannel plate detector can deliver both audio and video information in a 6-meter vacuum tunnel. The point is how to evaluate this space X-ray demonstration system in a typical experimental way. The method is to design a specific board to measure the relationship between bit-error-rate and emitting power against various communicating distances. In addition, the data should be compared with the calculation and simulation results to estimate the referred theoretical model. The concept of using X-ray as signal carriers is confirmed by our first generation X-ray communication demonstration system. Specifically, the method is to use grid-controlled emission source as a transceiver while implementing the photon counting detector which can be regarded as an important orientation of future deep-space X-ray communication applications. As the key specification of any given communication system, bit-error-rate level should be informed first. In addition, the theoretical analysis by using Poisson noise model also has been implemented to support this novel communication concept. Previous experimental results indicated that the X-ray audio demonstration system requires a 10−4 bit-error-rate level with 25 kbps communication rate. The system bit-error-rate based on on-off keying (OOK) modulation is calculated and measured, which corresponds to the theoretical calculation commendably. Another point that should be taken into consideration is the emitting energy, which is the main restriction of current X-ray communication system. The designed experiment shows that the detected X-ray energy is 7 × 10−5 mW/m2. This relatively low power level not only restricts the bit rate of transceiver, but also increases the error fraction to some extent. Obviously, OOK modulation can meet the high communication rate and relatively low bit-error-rate requirement of current audio demo system. Current restriction has been pointed out and the potential improvement is also presented.关键词
X射线通信/泊松噪声模型/误码率/单光子探测器Key words
X-ray communication/Poisson noise model/bit error rate/photon counting detector引用本文复制引用
王律强,苏桐,赵宝升,盛立志,刘永安,刘舵..X射线通信系统的误码率分析∗[J].物理学报,2015,(12):1-6,6.基金项目
国家自然科学基金(批准号:11103069,61471357)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.11103069,61471357) （批准号:11103069,61471357）
