OFDM认知无线电机会频谱接入干扰抵消带外泄漏In this paper, two novel methods called EAIC (Extended Active Interference Cancellation) and EAIC-H (EAIC-Hybrid) for spectral sculpting of OFDM signal are proposed. In EAIC and EAIC-H, cancellation signals are added to OFDM signal to cancel ...
apsychotherapeutic treatment 精神治疗治疗[translate] aDirect Current sub-carrier ("middle" sub-carrier in the spectrum of an OFDM signal, not being transmitted) Direct current副载波频率(“中间”副载波频率在,不被传送的OFDM信号的光谱)[translate]...
We consider spectrum sensing of OFDM signals in an AWGN channel. For the case of completely known noise and signal powers, we set up a vector-matrix model for an OFDM signal with a cyclic prefix and derive the optimal Neyman-Pearson detector from first principles. The optimal detector exploits...
Vector OFDM (VOFDM) is equivalent to OTFS and is good for time-varying channels. However, due to its vector form, its signal spectrum is not as clear as that of the conventional OFDM. In this paper, we study the discrete spectrum of discrete VOFDM signals. We obtain a linear relationshi...
In this paper, we consider the problem of spectrum sensing in cognitive radio for OFDM signals using correlated pilots. The pilot correlation is exploited to detect the presence of a primary signal based on its cyclostationary properties. The performance of such detector relies on the exact value ...
这两台仪器虽然说一个是量测时域一个是量测频域,但新型态的频谱分析仪或叫做讯号分析仪(Signal Analyzer)骨子里都是量测时域(Time Domain),其实现实的讯号都是所谓的时域讯号,只是高频讯号很难直接量测,所以才会用接收机先降频后在处理,但现在高阶的示波器(Oscilloscope)的取样率(Sampling Rate)与频宽都相当高,已...
A spread-spectrum system is one in which the transmitted signal is spread over a wide frequency band, much wider than the bandwidth required to transmit the message. Such a system would take a baseband voice signal with a bandwidth of a few kilohertz and spread it to a band of many megahe...
A form of this, known as coded OFDM or COFDM, is used for many Wi-Fi applications, such as IEEE Standard 802.11 as well as digital radio (DAB), and it is likely that it will be used for the fourth-generation (4G) mobile standards to provide very high data rates. A COFDM signal ...
Application of the Spread Spectrum Technology in the IS-95 CDMA System; 扩频技术在IS-95CDMA系统中的应用 更多例句>> 6) spread-spectrum technique 扩频技术 1. First, the spread-spectrum technique is introduced to spread watermark signal. 基于扩频技术研究了数字图像水印的相关特性 ,采用直接序列扩...
A Survey of Dynamic Spectrum Access 这是2007年IEEE Signal Process 杂志上的一篇文章。综述DSA的。正如文章最后所说,DSA/OSA(Opportunity Spectrum Access)还处于襁褓期,在技术、政策、经济方面还有很多很有挑战的问题需要解决。而且现在的各种技术实现也都不同。所以文章也是事无巨细地讲解DSA不同方面面临的各种问题...