Digital code transmission with medium wave AM radio transmitter

Eleventh Annual International Phoenix Conference on Computers and Communication [1992 Conference Proceedings] Pub Date : 1992-04-01 DOI:10.1109/PCCC.1992.200564

K. Wakai, J. Li, T. Komastu, H. Ikeda, J.I. Satoh

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引用次数: 2

Abstract

The authors describe a new system for multiplexing digital codes onto the AM radio signal at medium wave frequency, and also analyze the interference of the digital codes with the AM radio signal. This type of phase shift keying (PSK) system was actualized by using the phase modulation of a narrowband phase shift. The phase modulation of the narrowband phase shift suppressed the required spectrum band energy under 10 dB compared with that in the normal BPSK the QPSK system and the interference of the PSK signal with the AM signal was improved by approximately 15 dB compared with that in the normal BPSK or QPSK system. The experimental results agree with the results of the computer simulation. Up to 99% of the transmitted signal energy was designed to fall into a bandwidth of +or-7.5 kHz around a center frequency of 1 MHz when the system was operated at a data rate of 1200 b/s or 2400 b/s, when the total angle of phase shift was 90 degrees in 2 phi PSK and when the total angle of phase shift was 150 degrees at 4 phi PSK.<>

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用中波调幅无线电发射机进行数字编码传输

介绍了一种中波调幅无线电信号的数字码复用系统，并分析了数字码对调幅无线电信号的干扰。这种类型的相移键控(PSK)系统采用窄带相移的相位调制实现。窄带相移的相位调制将QPSK系统所需的频谱带能量抑制在10 dB以下，PSK信号与调幅信号的干扰比普通BPSK或QPSK系统改善了约15 dB。实验结果与计算机模拟结果相吻合。当系统以1200 b/s或2400 b/s的数据速率运行时，当2 phi PSK的总相移角为90度，当4 phi PSK的总相移角为150度时，高达99%的传输信号能量落在1 MHz中心频率附近+或7.5 kHz的带宽上。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Eleventh Annual International Phoenix Conference on Computers and Communication [1992 Conference Proceedings]

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