G3-PLC是专为智能电网通信设计的电力载波通信标准。由于电力线信道环境恶劣,低信噪比时,G3-PLC通信可靠性难以保证。同时,因前向纠错结构复杂,核心技术正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)运算量大,实现效...G3-PLC是专为智能电网通信设计的电力载波通信标准。由于电力线信道环境恶劣,低信噪比时,G3-PLC通信可靠性难以保证。同时,因前向纠错结构复杂,核心技术正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)运算量大,实现效率较低。针对上述问题,基于嵌入式平台对G3-PLC进行优化,提出RS编码、卷积码、时频联合分段重构编码及循环维纳滤波联合应用的方法来优化系统可靠性,基于状态转移的方法实现OFDM符号准确同步,通过定点化FFT及合理的帧结构设计优化效率。设计的优化方法基于嵌入式平台进行实现及测试,结果表明,在信噪比为-11 dB时,可达10^-4以下的误码率,系统工作稳定,实现效率得到大幅提升。展开更多
The challenges brought by broadband wireless access technologies to cellular mobile communication technologies speed up the study and standardization of 3G evolution technologies that support higher data rates. Both t...The challenges brought by broadband wireless access technologies to cellular mobile communication technologies speed up the study and standardization of 3G evolution technologies that support higher data rates. Both the 3GPP and the 3GPP2 have launched research programs on the study and standardization of the emerging 3G evolution technologies. The Long Term Evolution (LTE) program of 3GPP has made progress in key technical indexes of air interface, wireless network architecture and high-level protocols. At the same time, the Air Interface Evolution (AIE) program of 3GPP2 has made study achievements in the formulation of air interface standards for Layer 2 and upper layers, as well as for the physical layer.展开更多
Only ZTE can deliver end-to-end equipment for all 3G standards-WCDMA, CDMA2000, TD-SCDMA and WiMAX. Our WCDMA solutions are used in 30 countries and regions,
Only ZTE can deliver end-to-end equipment for all 3G standards-WCDMA, CDMA2000, TD-SCDMA and WiMAX. Our WCDMA solutions are used in 30 countries and regions, and our CDMA systems are used by 120 operators in more than...Only ZTE can deliver end-to-end equipment for all 3G standards-WCDMA, CDMA2000, TD-SCDMA and WiMAX. Our WCDMA solutions are used in 30 countries and regions, and our CDMA systems are used by 120 operators in more than 70 countries.展开更多
From the discussion above, the 3G choice of China is difficult to makerapidly because of multiple complicated factors. Either delay or impulsion will be costly. So theChinese government regulators need intensive and c...From the discussion above, the 3G choice of China is difficult to makerapidly because of multiple complicated factors. Either delay or impulsion will be costly. So theChinese government regulators need intensive and careful study on key factors before making a rightdecision. But the following policy trends can be inferred: (1)The regulator will not use the auctionlike Europe to issue 3G licenses; (2)Three 3G standards will co-exist in China mobile market withmultiple 3G services competition; (3)The 3G licenses schedule of China will inevitably be associatedwith the market demand and standard mature.展开更多
文摘G3-PLC是专为智能电网通信设计的电力载波通信标准。由于电力线信道环境恶劣,低信噪比时,G3-PLC通信可靠性难以保证。同时,因前向纠错结构复杂,核心技术正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)运算量大,实现效率较低。针对上述问题,基于嵌入式平台对G3-PLC进行优化,提出RS编码、卷积码、时频联合分段重构编码及循环维纳滤波联合应用的方法来优化系统可靠性,基于状态转移的方法实现OFDM符号准确同步,通过定点化FFT及合理的帧结构设计优化效率。设计的优化方法基于嵌入式平台进行实现及测试,结果表明,在信噪比为-11 dB时,可达10^-4以下的误码率,系统工作稳定,实现效率得到大幅提升。
基金National "863"Program of China (No. 2005AA123410)
文摘The challenges brought by broadband wireless access technologies to cellular mobile communication technologies speed up the study and standardization of 3G evolution technologies that support higher data rates. Both the 3GPP and the 3GPP2 have launched research programs on the study and standardization of the emerging 3G evolution technologies. The Long Term Evolution (LTE) program of 3GPP has made progress in key technical indexes of air interface, wireless network architecture and high-level protocols. At the same time, the Air Interface Evolution (AIE) program of 3GPP2 has made study achievements in the formulation of air interface standards for Layer 2 and upper layers, as well as for the physical layer.
文摘Only ZTE can deliver end-to-end equipment for all 3G standards-WCDMA, CDMA2000, TD-SCDMA and WiMAX. Our WCDMA solutions are used in 30 countries and regions,
文摘Only ZTE can deliver end-to-end equipment for all 3G standards-WCDMA, CDMA2000, TD-SCDMA and WiMAX. Our WCDMA solutions are used in 30 countries and regions, and our CDMA systems are used by 120 operators in more than 70 countries.
文摘From the discussion above, the 3G choice of China is difficult to makerapidly because of multiple complicated factors. Either delay or impulsion will be costly. So theChinese government regulators need intensive and careful study on key factors before making a rightdecision. But the following policy trends can be inferred: (1)The regulator will not use the auctionlike Europe to issue 3G licenses; (2)Three 3G standards will co-exist in China mobile market withmultiple 3G services competition; (3)The 3G licenses schedule of China will inevitably be associatedwith the market demand and standard mature.
