带外辐射

传统的频率调制和相位调制两种数字调制方式都存在频谱利用率低、抗多径衰落能力差、功率谱衰减慢、带外辐射严重等不足。

As the two traditional methods of digital modulation , frequency modulation and phase modulation , have some defects , such as low spectrum utilization rate , poor resistance to multi-path fading , slow power spectrum decaying , serious out-of-band radiation .

文中讨论了使用限幅解决峰均比问题的方法，并针对其存在的带内畸变、带外辐射和计算复杂度等问题进行了改善，对其性能进行了分析。

This paper discusses the methods by amplitude clipping and filtering to reduce PAPR , including the sequence problems : in-band distortion , out-of-band radiation and computational complexity .

可以总结出，这种预失真器可以有效地减小OFDM信号的带外辐射。

It is also concluded that the predistorter can effectively decrease the out of band emission in OFDM signal .

与用于OFDM多载波系统调制的矩形滤波器相比，这种新的滤波器可以使系统有效抵抗频率选择性衰落及移动接收时带来的多普勒扩展效应，并可以有效降低OFDM系统的带外辐射功率。

Compared with the rectangular filters of the OFDM Multi-Carrier Systems , the filter we design can efficiently provide protection against frequency dispersion caused by Doppler spread . The out-of-band emission in wireless OFDM can also be reduced .

系统采用MSK调制方式，该方式具有频带利用率高、带外辐射小的特点，使系统的性能得到很大提高。

The system uses MSK modulation . The advantages of the modulation are high bandwidth efficiency and Small-band radiation . In this way the performance of the system greatly improved .

由于GMSK调制具有信号频谱利用率高、低的误码率、抗干扰能力强、带外辐射小等优点，因此被广泛应用到无线通信中。本文首先介绍了调制解调技术的发展。

Because the GMSK Modulation / Demodulation has better signal spectrum efficiency 、 low Bit Error Rate , stronger anti-interference performance and smaller-band radiation , it is widely applied to wireless communications . First , the thesis describes the development of the modulation / demodulation technology .

通常功率放大器的非线性会导致信号的非线性失真，非线性失真会导致子载波间的交调干扰和带外辐射，破坏子载波间的正交性，从而导致整个系统的性能下降。

Usually the non-linear of the power amplifier will lead to nonlinear distortion , nonlinear distortion will lead to inter-subcarrier interference and cross-band radiation , damage among subcarriers orthogonality , resulting in overall system performance degradation .

它有较好的功率谱特性和较优的误码率性能，其最大的优点是带外辐射小，功率谱旁瓣衰减快，对临近频率的干扰小，适用于工作在VHF/UHF频段的移动通信系统。

It has the good power frequency spectrum characteristic and the superior error rate performance . Its biggest merit is that the belt external radiation is small , the power spectrum side lobe weakens quickly , to approaches the frequency the disturbance to be small .

主要讨论了OFDM系统中抑制其带外功率辐射的算法。

In this paper an algorithm of reducing out-of-band emissions of OFDM based on GI is proposed .

带外噪声对DSDR辐射计灵敏度的影响

Effect on Sensitivity of Direct RF Sampling Digital Microwave Radiometer by Out-Band Noise