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Turbo Code Simulation in W-CDMA System 被引量:2
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作者 蒋朱成 尤肖虎 《Journal of Southeast University(English Edition)》 EI CAS 2000年第2期20-25,共6页
Turbo code has drawn more and more attractions for high data rate transmission these years especially in W CDMA and CDMA2000 of the third generation mobile communications systems. In this paper, the simulation perfor... Turbo code has drawn more and more attractions for high data rate transmission these years especially in W CDMA and CDMA2000 of the third generation mobile communications systems. In this paper, the simulation performance of turbo code under Rayleigh fading channel and additive white Gaussian channels are depicted. Comparison with the performance of convolutional code are made respect to different parameters, such as pilot length, interleaver size, frame length, mobile velocity and data rate, etc. Faithful results are drawn out. 展开更多
关键词 w CDMA error correcting code turbo code PILOT
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改革《地面气象要素上传数据(Z)文件》W1W2的探讨
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作者 茅圣仁 许文进 +3 位作者 林永强 吴丽琼 姚新锋 王万宣 《贵州气象》 2014年第2期52-53,共2页
气象台站的《地面气象要素上传数据(Z)文件》中2个过去天气码W1W2,既不能完善地反映测站过去天气时段所出现的天气现象又编码复杂。为了解决此问题,探索用4个过去天气码W1W2W3W4按逆时间顺序编码。当有5个或5个以上过去天气码W码可供选... 气象台站的《地面气象要素上传数据(Z)文件》中2个过去天气码W1W2,既不能完善地反映测站过去天气时段所出现的天气现象又编码复杂。为了解决此问题,探索用4个过去天气码W1W2W3W4按逆时间顺序编码。当有5个或5个以上过去天气码W码可供选报时,留4个W大码参加W1W2W3W4选报;有4个W码可供选报4时,用这4个W码参加W1W2W3W4选报;有3或2个W码可供选报时,根据天气现象是否开始出现在过去1 h之前参加W1W2W3W4选报;有一个W码可供选报时,根据该天气现象是否持续占满过去1 h之前的整个时段参加W1W2W3W4选报。W1W2W3W4的优点有编报简单,减少编报出错几率,比W1W2多一倍的码,能更全面地反映测站的天气情况。建议改革W1W2为W1W2W3W4,提高地面气象测报质量。 展开更多
关键词 w1w2二 w1w2w3w4四
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调频高速数据广播
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作者 王亚伦 《广播电视信息》 1998年第5期27-28,共2页
本广介绍一种“W码”的数据信号处理新技术。“W码”具有传输速率高、抗干扰能力强、解码电路简单的特点。“W码”技术可应用于调频SCA信道的数据广播,也可在播出非立体声节目时,在L-R信道进行数据广播,该系统与现有调频广播系统完全兼容。
关键词 调频 调频数据广播 w码
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Deterministic quantum communication using the symmetric W state 被引量:9
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作者 TSAI Chia-Wei HWANG Tzonelih 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第10期1903-1908,共6页
This study proposes a new coding function for the symmetric W state. Based on the new coding function, a theoretical protocol of deterministic quanama communication (DQC) is proposed. The sender can use the proposed... This study proposes a new coding function for the symmetric W state. Based on the new coding function, a theoretical protocol of deterministic quanama communication (DQC) is proposed. The sender can use the proposed coding function to encode his/her message, and the receiver can perform the imperfect Bell measurement to obtain the sender's message. In comparison to the existing DQC protocols that also use the W class state, the proposed protocol is more efficient and also more practical within today's technology. Moreover, the security of this protocol is analyzed to show that any eavesdropper will be detected with a very high probability under both the ideal and the noisy quantum channel. 展开更多
关键词 deterministic quantum communication symmetric w state imperfect Bell measurement
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