英语翻译摘要：,如今各种数字通信系统已广泛用于我们的生产生活中.然而数字信号在传输过程中,由于受到干扰的影响,码元波形将

英语翻译
摘要：,如今各种数字通信系统已广泛用于我们的生产生活中.然而数字信号在传输过程中,由于受到干扰的影响,码元波形将变坏.接收端收到后可能发生错误判决.由乘性干扰引起的码间串扰,可以采用均衡的办法纠正.而加性干扰的影响则需要用其它办法解决.在设计数字通信系统时,应该首先从合理选择调制制度、解调方法以及发送功率等方面考虑,使加性干扰不足以影响达到误码率的要求.在仍不能满足要求时,就要考虑差错控制措施了,这就是我们研究差错控制技术的意义所在.差错控制技术作为各数字通信系统的一项关键技术,虽然各种成熟的差错控制技术已广泛应用于各种通信系统.但在通信领域,同欧美等发达国家相比,我国还处在相对落后的地步,所以加快在此领域的研究以是当务之急.而缩短卷积码作为一种优秀的编码方式,有这极其重要的研究价值.因此,本文拟对单独使用缩短卷积码的差错控制系统和既使用缩短卷积码又使用交织技术的差错控制系统进行matlab仿真.用以研究缩短卷积码与交织技术各对差错控制系统的性能影响,得出期对突发错误与随机错误性能改善曲线.为以后其他研究提供借鉴.
关键词：缩短卷积码；交织技术；差错控制；突发错误；随机错误；matlab仿真；

Abstract: various digital communication system, now already is widely used in our production life. However, digital signal in a transmission process, because of the influence of interference, yards yuan waveform will grow worse. After the receiver mistakes can happen sentence. Caused by the code multiplicative interference between crosstalk, can use a balanced way to correct. And the effects of the interference with sex with other solution is needed. In the design of digital communication system, should first from the rational choice modulation system, demodulation method and send power into consideration, make add sexual interference to not affect ber requirements. In still cannot meet the requirements, will consider error-controlling measures, this is we study the meaning of error control technology. Error control technology of the digital communication systems as a key technology, although all sorts of mature error-controlling technology has been widely applied in all kinds of communication system. But in telecommunication field, compared with Europe and America and other developed countries, China is still in relatively backward point in this area, so the speed of study to is a priority. And shortened as a kind of excellent convolution code of coding mode and have this extremely important research value. Therefore, this paper attempts to shorten convolution code used alone the error-controlling system and use both shorten convolution code and use the interwoven technology errors control system of the matlab simulation. With convolution code for studying shorten to mistake the interwoven technology of the control system, it is concluded that the impact on performance of unexpected errors and period of random error performance improvement curve. After provide reference for other research.
Keywords: shorten convolution code; Interwoven technology; Error-controlling; Unexpected error; Random errors; Matlab simulation;
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再答： Abstract:Nowdays various digital communication system is already widely used in our production and life. However, digital signal in the transmission process, as influenceted by interference, the code element waveform will become worse. Receiving end may make mistakes decision after receip of it. Due to intersymbol interference which caused by the code multiplicative interference , it can use a balanced way to correct. But it need other solution for the interference of additive noise.During designing digital communication system,firstly it should choose selective reasonable modulation, demodulation method and transmitted power etc. into consideration, make the additive noise doesn't affect ber. If it still cannot meet the requirements, we will consider error-controlling measures, this is the meaning we study error control technology. Error control technology as a key technology of the digital communication systems, although all sorts of mature error-controlling technology has been widely applied in all kinds of communication system. But in telecommunication field, compared with Europe, America and other developed countries, China is still in relatively backward point in this field, so speed up studying in this field is a urgent affairs. And shortened convolution codeas is a kind of excellent coding mode and have extremely important research value.Therefore, this paper attempts to exclusive use the error-controlling system of the shorten convolution code and use both shorten convolution code and the interwoven technology errors control system of the matlab simulation. To study the effect performance of shorten convolution code and interwoven technology of the control system, it is concluded that the impact on performance of unexpected errors and period of random error performance improvement curve. provided reference for other research in future Keywords: shorten convolution code; Interwoven technology; Error-controlling; Unexpected error; Random errors字数限制