共查询到19条相似文献,搜索用时 193 毫秒
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功放的非线性会带来调制信号的性能恶化,基于simulink建模,对比仿真了恒包络调制MSK和非恒包络调制BPSK,在功放线性和非线性区域时的误码性能,以及在带宽受限条件下,相邻信道干扰对信号误码性能影响.仿真结果表明,功放饱和对非恒包络调制信号影响更大,尤其是信道间隔较小的情况下,非恒包络调制信号的误码性能恶化严重.该研究为数字通信系统的工程设计提供了一种可借鉴分析方法. 相似文献
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QAM调制由于高频谱效率得到了广泛应用,但由于QAM信号的功率峰均比较高,功率放大器的非线性会导致解调性能的下降。针对功放非线性对QAM解调性能的影响,传统方法采用仿真实验的方法来获得,而文中推导了高斯信道下功率放大器的非线性对QAM解调误码率影响的闭合表达式,可求出非线性功放在不同静态工作点对应的误码率。仿真结果验证了理论分析的正确性。 相似文献
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本论文通过MATLAB仿真设计程序,实现信号的2PSK调制解调的程序仿真。误码率是衡量一个数字通信系统性能的重要指标,预测对比各个解调方式的误码率结果,包括相干ASK、非相干ASK、相干FSK以及非相干FSK与PSK,结果表明在抗加性高斯白噪声方面,2PSK性能最好,2FSK次之,2ASK最差。 相似文献
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本文通过将Proteus虚拟仿真软件引入数字通信课堂教学,对Proteus虚拟仿真软件在数字通信课堂教学中进行尝试性的应用,并对Proteus虚拟仿真软件在课堂教学中的作用做进一步的分析和研究。 相似文献
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论文首先介绍了高速调制解调器中正交调制器载波I/Q支路幅相失配的模型,然后在此模型上推导了TCM-8PSK信号误比特率性能公式,最后运用Matlab中的动态仿真工具Simulink仿真验证了推导结果。推导与仿真结果都表明,在载波I/Q幅相失配条件下TCM-8PSK信号的误比特率性能下降了。 相似文献
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Ilia Iofedov Igor Gutman Dov Wulich 《International Journal of Wireless Information Networks》2013,20(3):204-214
A communication system with nonlinear Power Amplifier (PA) is considered. The PA nonlinearity forces the designer of communication system to choose proper Back-Off, which influences three major parameters of the communication system: (i) power efficiency, (ii) Adjacent Channel Power Ratio (ACPR), and (iii) bit rate expressed by Mutual Information (MI). Having these three parameters, we propose to evaluate the performance of a communication system with nonlinear PA using the fact that ACPR is dictated by the regulator/communication standard. In what follows we propose to find power efficiency and MI as a function of ACPR. To illustrate the usefulness of the proposed method, the Solid State Power Amplifier (SSPA), and two linearized versions of SSPA are considered. The first version is a perfectly linearized PA using pre-distortion resulting with Soft Envelope Limiter (SEL), and the second is the Feed-Forward (FF) architecture based on SSPA. For each of the PAs ACPR, power efficiency and MI are found. While the analysis of SSPA and SEL is mainly based on the existing literature, the analysis of FF may be considered as a new contribution. From the results of the analysis it is concluded that linearization improves the overall performance of communication system. It is also shown that the pre-distortion method (SEL) shows better performance than FF. 相似文献
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1引言1982年CD开创了数字音响时代,1997年问世的DVD开创了数字视听时代,无线电转播的数字电视(DTV)在英、美等国也早已在1998年底先后播出,并且数字电影院也开始在美国、中国出现。在数字科技日新月异的进展中,所有家用音响组合和视听组合也将进一步向数字化方向发展,大势所趋,不可阻挡。虽然仍有人认为传统的模拟音响产品具有高音质的声音,例如60年代盘式录音机所录制的原声带至今依然比CD录音更要传真,70年代的LP唱片以顶级的音响设备播放时,其音质仍然可能与目前的数字音响匹敌。但是这些高质量的模拟… 相似文献
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通过对数字音频功率放大器的技术分析,探讨了相关产品的应用及推广价值,阐述了数字音频功率放大器产品的市场应用前景。 相似文献
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手机的使用越来越广泛,但是手机的待机时间的要求也越来越高.延长待机时间的方法有两种,一是增加电池的容量、二是减少手机的耗电.射频模块的耗电占手机的很大一部分.射频模块低功耗就越来越受大家的关注.本文主要就手机2G 功率放大器的降低功耗提供一个改进方法. 相似文献
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《Signal Processing, IEEE Transactions on》2006,54(11):4343-4351
A probabilistic approach to compensate the nonlinear distortion caused by a high power amplifier (HPA) in a communication system is proposed here. This is a nonparametric method that involves estimating two probabilistic cumulative distribution functions without any explicit parameter estimation as in the conventional compensation techniques. It is shown analytically that the maximum compensation error of the proposed method is bounded and small. An adaptive implementation is developed. Experiments are setup to collect the HPA data. Real data analysis shows that the proposed predistorter has an improved performance compared to the conventional polynomial and neural network predistortion techniques. 相似文献