低频信道调制方案研究  

Research of Modulation Scheme for Low Frequency Channel

作　　者：高振威[1] 陈惠民[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《无线电通信技术》2009年第2期21-23,共3页Radio Communications Technology

摘　　要：低频信道是功率受限型信道。低频信道具有噪声大、频带窄、辐射效率低的特点,因此,低频通信的实施难度极大。对比分析了在低频信道条件下的几种编码调制方式的性能优劣,进而提出了一种将卷积编码和CPFSK相结合的解决方案。该方案具有功率利用率高、频率利用率高、相位连续、包络恒定、复杂度低等优点。从理论分析和计算机仿真结果可以看出,该低频信道编码调制方案经济可行、性能良好。In order to adapt to the characteristics of high channel noise, narrow bandwidth, low signal radiation efficiency in LF communication, this thesis presents a modulation scheme which combines convolutional encoding and CPFSK modulation. The scheme has the advantages of high utilization ratio of power, high utilization ratio of frequency, continuous phase, constant envelope and low complexity. From the computer simulation results, the scheme shows excellent performance in the low-frequency channel.

关 键 词：LF 低频信道 卷积码 CPM CPFSK 

分 类 号：TN76[电子电信—电路与系统]