摘要
相比于地面无线信道,矿井巷道无线信道多径衰落更加严重,严重影响了煤矿井下无线通信系统的性能。高效综合地利用煤矿井下通信系统的空间、时间和频率等各种资源,可以使煤矿井下无线通信系统的无线覆盖性能、容量和速率等得到显著地提高。在煤矿井下无线传输信道与带状受限空间结构的条件下,提出了在上行链路中采用协作分集的多载波码分多址(MC-CDMA)无线传输方案。设计了方案的时频编码协作协议,推导了方案的信道容量公式,并对误比特率进行了蒙特卡洛仿真。理论分析和仿真结果表明,采用所提出的矿井巷道时频编码协作MC-CDMA无线传输方案和时频编码协作协议,通过信道状况较好与较差用户间的协作,显著提高了系统中信道状况较差用户的信道容量和误码率性能,从而增强了井下无线通信系统信道容量的鲁棒性和通信的可靠性,使井下无线通信系统的性能得到显著改善。
In underground mine tunnels,multipath fading is much more severe than that in the terrestrial wireless channels,which would do harm to the performance of underground wireless communication. However,if the abundant resources such as space,time and frequency could be utilized efficiently and synthetically,the performance of underground wireless communication such as overlay,capacity and data rate could be improved significantly. Under the condition of wireless transmission channel and the confined space structure of underground coal mine,an uplink wireless transmission schemes which combines multiple carrier-code division multiple access（ MC-CDMA） with cooperative diversity was proposed. The coded time-frequency cooperative protocol was designed,the channel capacity was derived and the bit error rate（ BER） was simulated by Monte Carlo method for the proposed wireless scheme. Theoretical analysis and simulation results show that the channel capacity and BER performance for the mobile user with poor channel condition are improved significantly by the cooperation between the mobile user with poor channel condition and the mobile user with better channel condition. By this way,the robustness of the channel capacity and the reliability of underground wireless communication are both enhanced obviously which certainly will improve the global performance of underground wireless communication system.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第6期1177-1183,共7页
Journal of China Coal Society
基金
国家"十二五"科技支撑计划资助项目(2013BAK06B03)
国家自然科学基金资助项目(51274018)
关键词
矿井安全
矿井巷道
编码协作
多载波码分多址
时频编码
mining safety
mine tunnels
coded cooperation
multiple carrier-code division multiple access（MC-CD-MA）
time-frequency coding
