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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

Investigates the influence of stimulated Raman scattering (SRS) on WDM systems with EDFA. The energy in the short-wave channel is transferred to the long-wave channel by reason of SRS. Thus the short-wave channel is attenuated and the long-wave channel amplified, whereas the chief influence is on the former channel. So the error bit ratio of channel 1 is discussed. A theoretical model is presented based on probability and perturbation theory, as well as characteristics of the system for evaluation of...

Investigates the influence of stimulated Raman scattering (SRS) on WDM systems with EDFA. The energy in the short-wave channel is transferred to the long-wave channel by reason of SRS. Thus the short-wave channel is attenuated and the long-wave channel amplified, whereas the chief influence is on the former channel. So the error bit ratio of channel 1 is discussed. A theoretical model is presented based on probability and perturbation theory, as well as characteristics of the system for evaluation of error bit rate degradation. In term of the model, relation figure between EBR and the number of amplifiers, EBR and the interval among channels, EBR and the input optical power, EBR and the number of channels are shown. The paper analyses how SRS limits the input optical power and the number of EDFA, as well as the interval of channels from the relation figures. The results demonstrate that system parameters must be limited in longer-distance wave division multiplex systems with EDFA communication system. Reasonable channel interval and channel capability should be decided integrally considering the error bit rate.

本文研究了受激喇曼散射 (SRS)对有级联掺铒光纤放大器 (EDFA)的波分复用系统若干性能的影响。根据通信系统几率的特性 ,建立了SRS对通信系统误码率影响的理论模型 ,分析了它对输入光功率、信道数、信道间隔以及放大器个数和放大器间距的影响及相应限制。研究表明 ,合理采用较少的放大器数和较小的输入光功率 ,有利于保证系统的性能指标 ,降低系统造价 ,提高系统性价比 ;由最小误码率来综合确定合理的信道间隔和信道容量 ;通过合理的设置放大器及系统参数 ,可以使受激喇曼散射的影响减至最小 ,从而实现性能良好的长距离、大容量通信

 
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