| 1. | An interleaver was introduced between the two encoders to scatter bursts of error produced by the inner decoder
两个编码器之间加进去一个交织器用来扩散内码产生的突发错误。 |
| 2. | In addition , reed - solomon ( rs ) coding and interleaving are applied to c orrect long outburst error , so the performance of the system is enhanced once more
Rs编码和交织技术的结合，更能纠正较长的突发错误或多个突发错误，进一步提高了系统的性能。 |
| 3. | However , in actual channels , rs code need be applied in combination with interleaving and scrambling in most cases to deal with sudden errors that break out continuously
而在实际信道中，由于常常要对付连续出错的突发错误，因此rs码常常还要与交织和加扰结合应用。 |
| 4. | Among the linear block codes , rs code is an important one widely used in modern digital communications , which can correct both random and bursty errors with the most powerful error - correcting capability
Rs码是一种典型的纠错码，在线性分组码中，它具有最强的纠错能力，既能纠正随机错误，也能纠正突发错误。 |
| 5. | A cyclic check code used to check and correct the burst error appeared in the transmission procedure of binary information sequence . it is one of the error check codes in common use for computer disc memory
用来检查、纠正二进制信息序列在传输过程中出现的突发错误的一种循环校验码，它是计算机磁盘存储器常用的错误校验码之一。 |
| 6. | Our scheme decreases l - 2db required eb / i0 relative to variable - power fixed rate transmission . we also show that this combined scheme avoid large errors occur . this allows the interleaving depth to be reduced
相对固定速率可变功率的传输方式，我们给出的方案使系统所需信干比eb io降低1 - 2db ，同时避免大块突发错误的产生，降低了交织深度。 |
| 7. | When there are less random errors in the channel , inner code can be utilized to correct them ; when there are lasting accidental errors or too many random errors beyond the inner code ' s capacity ,
当信道产生少量的随机错误时，通过内码就可以纠正。当产生较长的突发错误或随机错误很多，超过内码的纠错能力，则内译码器产生错译，输出的码字有几个错误。 |
| 8. | In the simulation , its redundancy - rate - distortion performance is analyzed firstly , then the performance of error concealment and error resilience , the coding framework proposed in this paper are tested and compared with the mdc based on pct and sdc in error - prone environments , the results testify that not only the proposed mdc scheme has a better robustness but also a higher coding efficiency , which ensures reliable transmission of compressed digital video over networks
在仿真实验中，首先对其冗余率失真进行了分析，然后和基于pct的mdc及传统单描述编码方法在有突发错误及丢包坏境中，对错误隐藏和错误复原等抗误码性能进行了比较，结果表明：本文的多描述编码在易错环境中不仅具有更优良的抗误码性能，而且编码效率较高，能够保证在网络上视频传输的可靠性。 |
| 9. | Shortwave channel is time varying transmission channel . it has dispersion in frequency and time domains . this characteristics hinds the data transmi - ssion at high speed and the correction of received data . in this dissertation i have analyzed the statistic characteristic of shortwa - ve channel , established the model of shortwave channel and simulated the rayl eigh fading distribution . the technology of spreading spetrum has been proved that it has the capability for anti - multipath and discerning multipath
在短波通信中，由于信道的时间色散和频率色散，引起多径展宽和多径衰落，前者限制了数据的传输速率，后者造成短波数据通信中出现突发错误，为了解决多径效应对短波通信的影响，本文所做工作如下：首先详细分析了短波信道的统计特性，建立其数学模型；其次分析了扩频通信的特点，从理论上证明扩频技术不仅具有抗多径干扰能力，而且具有分离多径的能力；介绍了传统的rake分集合并技术的特点。 |
| 10. | Many of communication systems take the convolutional code and viterbi algorithm as the channel coding scheme . the viterbi algorithm decoding is a kind of maximum likelihood decoding , and its performance is good over additive white gaussian noise ( awgn ) channel , but when burst errors occur , the decoding performance may be greatly degraded
维特比译码算法是最大似然译码,在由高斯白噪声引起的随机错误的信道中有良好的性能,但当信道错误集中或为突发错误信道时,维特比译码算法则性能急剧下降。 |
