两跳中继OFDMA蜂窝网络下行链路呼叫阻塞率分析  

Analysis of Call Blocking Probability in Downlink of Two-Hop-Relay OFDMA Cellular Networks

作　　者：鲁蔚锋[1,2,3] 杨绿溪[1] 吴蒙[3] 

机构地区：[1]东南大学信息与工程学院,江苏南京210096 [2]南京邮电大学计算机学院,江苏南京210023 [3]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,江苏南京210023

出　　处：《电子学报》2016年第2期340-347,共8页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61372101;No.61201176;No.61271018;No.61201160);国家科技重大专项(No.2012ZX03004-005-003);教育部博士点基金(No.20100092110010);江苏省科技计划(No.BK20131377);江苏省高校优秀中青年教师和校长境外研修计划

摘　　要：本文首先提出了一种分析OFDMA蜂窝网络下行链路呼叫阻塞率的方法,在此基础上进一步分析了加入两跳中继的OFDMA蜂窝网络呼叫阻塞率.OFDMA蜂窝网络的每个呼叫接入都需要随机数量的子载波来满足用户传输速率的需求,传统GSM及CDMA网络的容量分析方法不能应用到OFDMA网络系统中.本文根据用户对子载波的需求量,把接入用户分成不同的服务类型,以多维马尔可夫链为数学模型分别分析传统和两跳中继OFDMA蜂窝网络下行链路呼叫阻塞率,最终通过数值计算分析各种参数对系统性能的影响,数值分析结果表明加入中继后的两跳中继OFDMA蜂窝网络下行链路容量比传统网络有显著的提升.In this paper,a novel approach is presented to evaluate the call blocking probability in downlink of cellular Orthogonal Frequency Division Multiple Access（ OFDMA） networks. Based on this analysis,call blocking probability in downlink of two-hop-relay OFDMA cellular networks is evaluated. Capacity analysis of traditional cellular networks like GSMand CDMA cellular networks cannot be applied to OFDMA cellular networks because for the latter every incoming call requires a random number of sub-carriers. In this paper,incoming calls are divided into classes according to their requirement for sub-carrier. Then,the traditional and relay OFDMA cellular network are modeled as the multi-dimensional Markov chain and their call blocking probability in downlink are evaluated. Finally,through numerical calculation,the impact of the various parameters on the performance is analyzed. This analysis shows that the capacity of OFDMA cellular networks which added relays has been greatly improved.

关 键 词：正交频分多址接入 两跳中继 下行链路 呼叫阻塞率 马尔可夫链 

分 类 号：TN929.5[电子电信—通信与信息系统]