AWGN信道仿真数据量研究

Investigation on Simulation-Number in AWGN Channel

研究了蒙特卡罗仿真原理和仿真结果置信度;结合AWGN(加性白高斯噪声)信道特点,甄选出3个合适的参量,即误码个数、置信概率和仿真结果最大相对误差;提出了AWGN信道下仿真数据量选取的一般性结论,即误码个数正比于置信区间上分位点的平方、反比于最大相对误差的平方.仿真结果验证了所提结论在AWGN信道各种信噪比下均有效;同时对于无线通信或移动通信的时变多径衰落信道,如采用OFDM(正交频分复用)、分集、均衡、交织等技术,能将信道改造为AWGN信道,该结论依然有效.

Investigations on principle of Monte Carlo simulation was made when considering characteristics of AWGN （additive white Gaussian noise） channel and the affects of three suitable parameters： error number, confidence probability and max relative error of simulation result. And common conclusion was reached： error number would present direct ratio to square of confidence upper limit, on the other hand, inverse ratio to square of max relative error. The result of computer simulation demonstrates that the conclusion is effective under conditions of AWGN channel. Under conditions of fading multipath channel, if some techniques such as OFDM （orthogonal frequency division multiplexing）, diversity, equalization, and interleaving were used to turn channel into AWGN channel, the conclusion will be also effective.