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    First, we found the original HEC of ATM can not satisfy the QoS of multimedia service by investigating the original error control scheme in the case of high error bit ratio.
    首先,对标准ATM的差错控制机制在高误码率信道条件下的信元丢失情况进行了研究,发现单靠标准ATM中的头差错控制(HEC)机制,难以满足多媒体业务对信元丢失率的要求。
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The error bit ratio in AGWN channel is analysed for different correlative characteristics of PN codes in the tamed spread spectrum system in this paper. The results indicate thatPN code correlative characteristics influence the performences of tamed spread spectrum systems.

本文分析了在不同伪随机码相关特性的情况下,软扩频系统在加性高斯白噪声信道中的误比特性能,结果表明软扩频系统中所用伪随机码的相关特性直接影响到系统的性能.

This paper introduces the principle and coding of tamed spread spectrum system, the error bit ratios of tamed spread spectrum systems and general direct sequence spread spectrum systems are analyzed and compared. The result proves that the error bit ability of the system can be raised when the tamed spread spectrum is adopted.

介绍了软扩频系统的基本原理和编码 ,实现框图 ,分析比较了软扩频系统和一般直扩频系统在给定的加性高斯白噪声信道条件下的误比特性能。结果表明 ,软扩频技术的应用 ,可以有效地提高整个系统的误比特性能

There are many subchannels in the Orthegonal Frequency Division Multiplexing(OFDM).Based on the central limit theorem,the noise components of every subchannels receiver output can be shown to be the complex Gaussian with the zero mena.The error bit ratio(BER) performance formula for the block precoded OFDM system with zero forcing and squared error(MMSE) receivers in Rayleigh Raying channels is deduced in this paper.It is convenient to compare the BER performance of the different OFDM systems by...

There are many subchannels in the Orthegonal Frequency Division Multiplexing(OFDM).Based on the central limit theorem,the noise components of every subchannels receiver output can be shown to be the complex Gaussian with the zero mena.The error bit ratio(BER) performance formula for the block precoded OFDM system with zero forcing and squared error(MMSE) receivers in Rayleigh Raying channels is deduced in this paper.It is convenient to compare the BER performance of the different OFDM systems by the formula calculation.What is more,the actual BER obtained by the Monte Carlo simulation is identical with the BER by use of the formula.

推导了在瑞利衰落信道下的分组预编码正交频分多址调制系统,接收机采用迫零均衡和最小均方误差均衡的系统误码率公式.采用公式计算的方法可很方便地比较各种正交频分多址解调方案的误码特性.同时,通过计算机Monte Carlo方法模拟得到的误码率特性与公式法得到的误码率特性相吻合.

 
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