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  bit error rates
For a given quantization level, the Bit Error Rates are examined by considering the influence of the code structure, the block size, and the number of decoding steps.
      
However, propagation impairments can cause severe degradation in bit error rates (BER) for coherent detection.
      
We again find that the framed referential coding scheme exhibits good performance that can lead to significant header compression and packet drop savings for reasonable bit error rates.
      
The performance of BPSK, QPSK, and 16QAM modulation formats are compared and analytical and simulation results are presented in terms of the bit error rates (BER) for these different modulation formats.
      
The bit error rates (BER) of the decorrelating, parallel interference canceler (PIC) and groupwise serial interference canceler (GSIC) with either PIC or decorrelator within the group are compared.
      
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A software method for accomplishing the encoding, decoding and interleaving of BCH cude is studied from the point of view of engineering.The sottware realises the complicated error-correcting algorithm by the design of a simple program,and the bit-error-rate of 10~(-3)can be decreased to 10~(-7). This methed is suitable to the satellite data-bruadcasting communicatiuns,etc.

从工程观点研究了实现抗突发差错的BCH编码、译码及其交织技术的一种软件方法。这种方法把复杂的纠错算法用简单的程序设计予以实现,可使误码率由10 ̄(-3)降至10 ̄(-7)。这种方法适用于卫星数据广播通信等等各个方面。

Based on the models of the components in optical communication systems,this paper developed an application simulation software.An experiment platform for system performance evaluation and research is built.The simulation program can also display signal waveforms,generate eye diagrams and give the bit error rate.Some obtained results showed close agreement between the simulation and actual performance.

本文根据数字光纤通信系统各部分的数学模型进行编程,实现了从电发端到电收端整个系统的特性仿真,建立了一个可用于评估光纤通信系统性能及开展理论研究的实验平台,能够显示信号波形、性能眼图,给出系统的误码率等。运用该仿真软件对已有系统进行了性能测试与评估,仿真结果与实际性能相符合。

interweave is a very important component of Turbo - code. By using proper interweaves, we can increase free space of output sequence when we don' t change code of input sequence. This leads to Turbo - code has a excellent performance. On this paper, Block interweaves algorthms are studied. By using computer, we simulate decode performance of Turbo- code when we use two different block as well as short divide- group sequence. At last, we obtain a graph of signal - to- noise bit- error- rate.

交织器是Turbo码中一个比较重要的部分。通过适当的交织器,可以在不改变Turbo码输入序列码重的情况下增加输出序列的自由距。这也正是Turbo码具有良好性能的来源。本文重点对块交织算法进行了一些探讨。并在两种不同块交织方式、短分组序列的情况下,用计算机Turbo码译码性能进行了仿真,模拟出信噪比-误比特率曲线。

 
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