数字集群系统电路级失真及其数字纠正的仿真

Simulation of Circuit Level Distortions and Digital Compensation in Digital Trunked Systems

在设计低功率数字集群通信终端时,电路级失真效应是一个不容忽视的问题。以基于π/4-DQPSK调制方式的TETRA数字集群系统为例,首先通过理论分析对电路级失真效应建模,定量研究了增益和相位不平衡对系统误码性能的影响。然后基于Gram-Schmidt准则提出了针对电路级失真的数字纠正措施。仿真结果表明,该措施能有效消除系统中的电路级失真。

The effect of circuit level distortions is an important issue in the design of low power terminals in digital trunked systems. Taking TETRA systems using π/4-DQPSK as an example, the circuit level distortions were modeled based on theoretical analysis, and their effects on system BER performance were quantitatively studied. Then a method was proposed based on Gram-Schmidt rule to compensate these distortions digitally. The simulation results reveal that the circuit level distortions can be compensated effectively.