典型频域扩频多载波CDMA调制在矿井巷道信道下的性能分析  

Performance analysis of typical frequency domain spreading multicarrier CDMA modulation in mine tunnel

作　　者：杨维[1,2] 周青青[1,2] 

机构地区：[1]北京交通大学轨道交通控制与安全国家重点实验室,北京100044 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤炭学报》2010年第5期865-870,共6页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(50534060);国家高科技发展计划(863)资助项目(2007AA06Z106);煤炭资源与安全开采国家重点实验室(中国矿业大学)开放课题资助项目(2007-06)

摘　　要：基于所建立的Nakagami分布矿井巷道宽带统计分段信道模型,仿真分析了典型频域扩频多载波码分多址接入(MC-CDMA)调制技术在矿井巷道中的宽带无线通信性能。依据在空直巷道和弯曲巷道中无线信号传输的均方根时延扩展情况,设计了MC-CDMA系统参数所需要满足的约束条件以使各子载波信号经历非频率选择性衰落。仿真研究了在矿井空直巷道和弯曲巷道条件下,载波频率为1.8GHz和2.4GHz的矿井典型MC-CDMA调制在脉冲干扰和多普勒频移下的误码率性能。仿真结果表明:在矿井空直巷道下即使存在脉冲干扰或多普勒频移,当信噪比超过一个较小的值,矿井典型MC-CDMA系统仍有较好的误码率性能;在矿井弯曲巷道下无论是否存在多普勒频移或脉冲干扰,要保持矿井典型MC-CDMA系统有可接受的误码率性能,信噪比需要保持一个较大的值。The bit error rate （BER） performance of a typical frequency domain spreading multicarrier CDMA （MCCDMA） modulation in mine tunnel was analyzed based on the established multi-section Nakagami distribution statistical channel model of mine tunnel for wideband radio wave. According to the different root-mean-square （RMS） time delay of wideband radio wave along empty-straight or embranchment mine tunnel,the main parameter restriction condition of MC-CDMA was given so that any sub-carrier experiences frequency-unselective fading channel. Under the circumstances of straight or embranchment mine tunnel the BER performance of a typical MC-CDMA system at 1. 8 GHz and 2. 4 GHz was simulated either at the influence of Doppler frequency offset or impulse interference. Simulation results indicate that the BER performance of the typical MC-CDMA is well in the empty-straight mine tunnel at a lower signal-to-noise （SNR） even though Doppler frequency offset or impulse interference exists. However,a larger SNR is needed for an accepted BER performance in the embranchment mine tunnel whether Doppler frequency offset or impulse interference exists or not.

关 键 词：矿井巷道 典型MC-CDMA调制 Nakagami分布 误码率 

分 类 号：TD655[矿业工程—矿山机电]