The ergodic capacity of device-to-device （D2D） communication underlaying cellular networks is analyzed. First,the D2D communication model is introduced and the interference during uplink period and downlink period i...The ergodic capacity of device-to-device （D2D） communication underlaying cellular networks is analyzed. First,the D2D communication model is introduced and the interference during uplink period and downlink period is analyzed.In a D2D communication system,since it is very difficult to obtain the instantaneous channel state information （CSI）,assume that only the transmitters know the statistical CSI and the channel coefficient follows an independent complex Gaussian distribution.Based on the assumptions,for the uplink period,the signal to interference plus noise ratio （SINR）of the D2D user equipments（DUEs）is expressed. Then the cumulative distribution function （CDF ） and probability distribution function （PDF）formulae of the SINR of the DUEs are presented.Based on the SINR formulae during the uplink period,the ergodic capacity formula of the uplink period is derived. Subsequently, using the same methods,the ergodic capacity formula of the downlink period is derived.The simulation results show that the DUEs can still obtain a high ergodic capacity even in the case of a large number of DUEs.This result can be applied to the design and optimization of D2D communications.展开更多
It is widely believed that cooperative relay technologies can improve the throughput of multicasting in mobile cellular networks significantly, however, the mobility of the relay terrninals may cause frequent relay li...It is widely believed that cooperative relay technologies can improve the throughput of multicasting in mobile cellular networks significantly, however, the mobility of the relay terrninals may cause frequent relay link outage. This paper proposes a stream layered cooperative relay scheme to deal with this problem. In order to study the characteristics of layered relay channels in the scheme, the capacity region is determined based on a single and a multi relay abstract model with streams layering. Besides, to satisfy the cellular network scenario, the results are extended to a wireless Gaussian channel model. The analysis and simulation results show that the scheme guarantees the continuity of the multicast streams, and maintains the high bandwidth of relay channel, with a slight loss on system capacity.展开更多
Y99-61619-1226 0008037时分多址(含4篇文章)=E6(b)-TDMA[会,英]//1998 IEEE 9th International Symposium on Personal.Indoor and Mobile Radio Communications,Vol.3 of3.—1226～1244(HG)本部分4篇论文的题目是:时分多址(TDMA)通信...Y99-61619-1226 0008037时分多址(含4篇文章)=E6(b)-TDMA[会,英]//1998 IEEE 9th International Symposium on Personal.Indoor and Mobile Radio Communications,Vol.3 of3.—1226～1244(HG)本部分4篇论文的题目是:时分多址(TDMA)通信系统中同波道干扰对消的技术评价,蜂窝 TDMA 通信中基于循环平稳高阶统计学的信道跟踪,恒模信号的恒定误报警率 TDMA 突发检测方法,以及应用慢瑞利衰落计数-测量的 TDMA 蜂窝系统容量。展开更多
基金The National Natural Science Foundation of China(No.61301110)Foundation of Shanghai Key Laboratory of Intelligent Information Processing of China(No.IIPL-2014-005)
文摘The ergodic capacity of device-to-device （D2D） communication underlaying cellular networks is analyzed. First,the D2D communication model is introduced and the interference during uplink period and downlink period is analyzed.In a D2D communication system,since it is very difficult to obtain the instantaneous channel state information （CSI）,assume that only the transmitters know the statistical CSI and the channel coefficient follows an independent complex Gaussian distribution.Based on the assumptions,for the uplink period,the signal to interference plus noise ratio （SINR）of the D2D user equipments（DUEs）is expressed. Then the cumulative distribution function （CDF ） and probability distribution function （PDF）formulae of the SINR of the DUEs are presented.Based on the SINR formulae during the uplink period,the ergodic capacity formula of the uplink period is derived. Subsequently, using the same methods,the ergodic capacity formula of the downlink period is derived.The simulation results show that the DUEs can still obtain a high ergodic capacity even in the case of a large number of DUEs.This result can be applied to the design and optimization of D2D communications.
基金Supported by the State Key Program of National Natural Science Foundation of China （No. 60832009）, Natural Science Foundation of Bcijing （No. 4102044）, Innovative Project for Young Researchers in Central Higher Education Institutions, China （No. 2009RC0119） and New Generation of Broadband Wireless Mobile Communication Networks of Major Projects of National Science and Technology （No.2009ZX03003-003-01）.
文摘It is widely believed that cooperative relay technologies can improve the throughput of multicasting in mobile cellular networks significantly, however, the mobility of the relay terrninals may cause frequent relay link outage. This paper proposes a stream layered cooperative relay scheme to deal with this problem. In order to study the characteristics of layered relay channels in the scheme, the capacity region is determined based on a single and a multi relay abstract model with streams layering. Besides, to satisfy the cellular network scenario, the results are extended to a wireless Gaussian channel model. The analysis and simulation results show that the scheme guarantees the continuity of the multicast streams, and maintains the high bandwidth of relay channel, with a slight loss on system capacity.
文摘Y99-61619-1226 0008037时分多址(含4篇文章)=E6(b)-TDMA[会,英]//1998 IEEE 9th International Symposium on Personal.Indoor and Mobile Radio Communications,Vol.3 of3.—1226～1244(HG)本部分4篇论文的题目是:时分多址(TDMA)通信系统中同波道干扰对消的技术评价,蜂窝 TDMA 通信中基于循环平稳高阶统计学的信道跟踪,恒模信号的恒定误报警率 TDMA 突发检测方法,以及应用慢瑞利衰落计数-测量的 TDMA 蜂窝系统容量。
