信道间干扰

在每条路径上具有相同的归一化单频率偏移（NSFO）条件下，通过数学技巧推导了由NSFO产生的归一化信道间干扰（ICI）功率（NIP）公式的简单形式。

Normalized interchannel interference ( ICI ) power ( NIP ) caused by normalized single frequency offset ( NSFO ) has been derived to be one third of the square of NSFO by mathematical skills under the condition that each path has the same SFO .

时变信道以及信道冲激响应超过CP会带来子信道间干扰（ICI）和残留码间干扰（ICI），产生误码率平台。

The interchannel interference ( ICI ) and the residual intersymbol interference ( ISI ) could be introduced by time varying channel with channel impulse response that exceeds the length of CP.

该技术以牺牲部分抗符号间干扰（ISI）能力为代价来换取系统抗信道间干扰（ICI）的性能。

More immunity to Inter Channel Interference ( ICI ) can be achieved by sacrificing the partly immunity to ISI in FMT .

与单载波系统相比，OFDM系统存在多个正交子载波，导致同步误差不但会引起符号间干扰，还会引起信道间干扰。

Comparing with single carrier system , OFDM system has a number of orthogonal sub-carriers . Synchronization offset would cause severe Inter-Channel Interference ( ICI ) and Inter-Symbol Interference ( ISI ) .

而且，循环前缀的引入消除了符号间干扰（ISI），避免了信道间干扰（ICI）。

Moreover , serious ISI ( Inter-Symbol Interference ) and ICI ( Inter-Carrier Interference ) can be readily circumvented by introducing CP ( Cyclic Prefix ) .

同步偏差可能对接收信号产生数据相移、数据幅度衰减、数据循环移位、符号间干扰和信道间干扰等不利影响，所以同步技术是OFDM系统能否正常工作的关键因素。

Synchronization errors will introduce some undesirable effects to the system , such as phase shifting , amplitude attenuation , data cyclic shifting , inter-symbol interference and inter-carrier interference , so synchronization technique plays a key role in OFDM system .

OFDM载波频率偏差会带来OFDM的子信道间干扰（ICI），而OFDM数据符号同步的误差将会引入数据符号间干扰（ISI），同时还会对信道估计带来严重的影响。

This will result in the Inter Carrier Interference ( ICI ), and the synchronization error of the OFDM symbols will bring the Inter Symbol Interference ( ISI ) . The channel state estimation will also be affected seriously .

接着分析了保护间隔和循环前缀抗符号间干扰（ISI）和信道间干扰（ICI）的性能。

Then analyzes the performance of overcoming inter symbol interference ( ISI ) and inter channel interference ( ICI ) of the guard interval ( GI ) and the cyclic prefix ( CP ) .

多载波系统对频率偏移比较敏感，频偏会引起信道间干扰，进而使符号同步受到影响。

Multicarrier systems are much more sensitive to frequency offset , which results in inter-carrier interference ( ICI ) and affects symbol synchronization .

它具有频谱利用率高和良好的抗符号间串扰、信道间干扰、脉冲干扰和单频干扰的优良特性，并且易于多速率传输。因此是一种非常有发展的多载波调制技术。

It provides high frequency efficiency , better performance against intersymbol interference , intercarrier interference , tone and impulse interference and can transmit multirate symbols easily .

分集是一种有效的对抗无线移动通信中信号传输的多径衰落和信道间干扰的技术。

Transmissions over wireless channels suffer from multi-path fading and co-channel interference . Diversity has been accepted as an effective technique to combat these deleterious effects .

当车辆速度超过250km/h时，必须对多普勒效应引起的频率偏移进行估计并纠正以消除信道间干扰。

While the speed is over 250 km / h , the frequency offset caused by Doppler effect must be estimated and corrected to delete inter-carrier interference ( ICI ) .

GB/T17148-1997模拟声音节目信号的常规测试信号用于测量节目信道间的干扰

A conventional test signal simulating sound & Programme signals for measuring interference in other channels

引入了干扰因子，对不同信道间的干扰做了定量分析，为建模中的信道间干扰噪声的修改提供了具体参数和理论依据。

The parameter ' interference factor ' is introduced and a quantitative analysis for the interference between different channels is given , which provide theoretical basis for modifying interference noise between channels in modeling .

是一种信道存在符号间干扰（ISI）的接收性能的最佳补偿方法。

The algorithm is a best means for compensating the performance of the channel with ISI .

OVSF码的可变长性质可以满足不同速率的多媒体业务要求，其正交性可减少信道间的相互干扰。

OVSF code to meet the different nature of variable rate multi-media business requirements , their orthogonal can reduce inter-channel interference .

由于传统的Rake接收技术无法消除多径干扰，而EV-DO前向链路中的高阶调制信号经过信道后码间干扰尤其严重，限制了Rake接收机性能的进一步提高。

As is known , the traditional Rake receiver could not eliminate the multi-path interference , the high-level modulation signal also suffers from ISI through multi-path channel which limits the improvement of receiver performance .

这两种方案都可以在未知多径信道和帧间干扰存在的情况下实现。

Both the schemes can counteract the effects of inter-frame interference ( IFI ) and unknown multipath channels .

为了克服频率选择性信道中符号间干扰带来的影响，研究了单载波频域均衡系统中的信道估计技术。

In order to improve reduce the effect of inter symbol interference , channel estimation was studied in SC-FDE systems .

随着水声通信应用领域的不断扩展，实现数据的高速传输和克服水声信道的码间干扰，成为水声通信技术研究的重点。

Along with the application field of underwater acoustic ( UWA ), communication has expanded . How to realize the data transmission with high speed and to overcome intersymbol interference introduced by channel multipath propagation is very important .

该算法解决了由于PN序列自相关特性不理想而引入的信道脉冲响应抽头间干扰。

The algorithm successfully resolves the inter-tap interference of channel impulse response caused by the imperfection of the PN sequence autocorrelation property .

基于均方误差（MSE）准则，分析线性均衡器在补偿有符号间串扰（ISI）信道中的码间干扰时的性能状况。

The performance in which the channel with ISI is compensated by equalization approaches is analyzed .

无线通信中的多径效应会引起信道失真导致码间干扰（ISI）。

There exists multipath effect in the wireless communication systems , which causes channel distortion and intersymbol interference .

它能够抑制无线信道中的码间干扰（ISI）和频率选择性多径衰落，使之成为未来的通信标准之一。

Its ability to suppress Intersymbol Interference ( ISI ) and frequency selective fading as a result of multipath fading in the radio channel has made it a very strong candidate for future communication standards .

与单载波传输方案相比，正交频分复用（OFDM）能更有效地对付多径衰落信道引入的符号间干扰（ISI）；由于采用单抽头的信道均衡器，所以接收机相对简单，有利于硬件实现。

In comparison to single-carrier transmission , Orthogonal frequency division multiplexing ( OFDM ) is quite effective to eliminate inter-symbol interference ( ISI ) caused by channel multipath fading hostility , while providing high transmission data rate with high spectral efficiency .

利用基于LMS算法的分数间隔均衡抑制由多径衰落信道引起的码间干扰并且利用最大似然算法对解调后的码元进行检测。

The proposed FSE based on the least mean square ( LMS ) algorithm can mitigate the detrimental effects of the inter-symbol interference ( ISI ) caused by the multipath fading channel . The demodulated symbols are detected by the maximum likelihood ( ML ) algorithm .

在短波信道中，码间干扰是由于多途传播产生的影响通信的主要干扰。

ISI caused by multipath is the major obstacle in shortwave channel .

首先，本文阐述了测井电缆信道传输中码间干扰的产生，然后介绍了电缆的特性并给出了电缆信道模型，最后对电缆信道传输进行了分析。

First of all , it elaborates the reasons of ISI in the cable transmission . Then , introduces characteristics and model of the cable channels .

提出了信道编码的符号间干扰传输的最佳检测译码算法，即在接收信号检测和信道译码之间采用最大后验概率准则下的软入软出迭代检测译码。

The optimal algorithm of the coded ISI system is proposed that is iteratively soft-in soft-out joint detection and decoding under maximum a posterior ( MAP ) criterion .

分析了短波信道特性和码间干扰产生的原因，以奈奎斯特定理为基础分析了时域均衡的原理。

The characteristics of shortwave and the reasons of intersymbol interference are studied . Based on the Nyquist theorem , the time domain equalization is described in details .