改进MC-CDMA调制在矿井巷道信道下的性能分析  

Performance analysis of modified MC-CDMA modulation used in mine tunnel

作　　者：杨维[1,2] 周青青[1,2] 张玉[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]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《中国矿业大学学报》2011年第2期221-226,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(50534060);国家高技术研究发展计划(863)项目(2007AA06Z106)

摘　　要：基于典型频域扩频多载波码分多址接入(MC-CDMA)调制技术,分析了改进的MC-CD-MA调制在矿井巷道信道下的宽带无线通信性能,设计了改进的MC-CDMA系统参数,使各子载波信号在矿井巷道中经历的是非频率选择性衰落;改进的MC-CDMA系统用户的原始数据速率分别取10Mb/s和20Mb/s,中心载波频率分别为1.8和2.4GHz.结果表明:在矿井巷道信道下,相比于脉冲干扰和多普勒频移改进的MC-CDMA系统的用户数和用户的原始数据速率对系统的误码率(BER)性能影响更大。当小区用户数超过10个,改进矿井MC-CDMA系统的信噪比超过20dB,一般将出现BER性能的"地板效应".The bit error rate（BER） performance of a modified frequency domain spreading multicarrier CDMA（MC-CDMA） modulation used in mine tunnel was analyzed based on the typical MC-CDMA.The main system parameters of the modified MC-CDMA were also given so that any sub-carrier experiences frequency-unselective fading channel in main tunnel.In the simulation,the data rates of users were assumed to be 10 Mb/s and 20 Mb/s,and the central carrier frequencies were assumed to be 1.8 GHz and 2.4 GHz,respectively.The results show that the number and data rates of users generally affect the BER performance more than that of the impulse interference or Doppler frequency offset.When the number of users is more than ten in an area,the error floor of BER performance will generally occur at 20 dB signal-noise-ratio（SNR） for the modified MC-CDMA.

关 键 词：矿井巷道 改进MC-CDMA调制 误码率 

分 类 号：TD263[矿业工程—矿井建设]