陈-Mobius多路载波数字通信系统及性能仿真

Chen-Mobius Multi-carriers Digital Communication System and Its Performance Simulation

将几种常用数字波形的陈-Mobius逆变换作为多路载波数字通信系统数字输入信号的编码波形函数族,由其对二进制输入信号进行调制后直接叠加在一起在一个物理信道上进行传输;在接收端,用与各调制编码波形对应的正交的数字波形对各路信号进行同步相干解调,从而构成新的相干调制解调系统;而调制编码波形与解调波形函数族这两个函数族内部本身却是非正交的;而后应用MATALAB平台对这种新型多路载波数字通信系统进行性能仿真,在大量仿真平均的基础上,绘出了使用各函数族的系统的位错率对信噪比曲线,并与传统的相干调制解调系统的仿真结果相比较;结果表明,该系统具有更优异的抗强噪声与干扰的性能,可实现多路载波数字通信的直接叠加,节约系统的初始投资与运行费用。

The Chen - Mobius inverse transform function set of the digital waveform was used as the code waveform function set of the input digital signal in the multi - carriers digital communication system and the input binary digital signals modulated by each carrier were directly added together and transmitted through a physical channel. At the receiving end, the digital waveforms respectively orthogonal to the corresponding code waveforms were used to coherently demodulate the signals on each cartier. These two orthogonal function sets constitute a new coherent modem system ; but inside each function set the members of which are non - orthogonal each other. Then the new type multi - carriers digital communication system performance was simulated by the MATALAB platform, and on the average of the plenty simulation results the bit -error rate to S/N curves of our new system using five function set were plotted out and compared with the simulation result of the traditional system. The results of the comparison show that the new system has much more excellent performances to resist the strong noise and interference and the directly added multi -carriers digital communication could be realized and the system initial investment and the operation cost could be greatly saved.