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为解决无线数据广播系统(RDS)数据通信速率较低,难以满足宽带公路数据服务需求的问题,提出在公路调频广播中利用带内同频(IBOC)技术实现宽带数据服务。通过对带内同频的调频/无线数据广播系统(IBOC-FM/RDS)技术的研究,确定了调频多工高速数据广播系统(FMHDS)副载波的频偏范围,然后应用4次环法原理,对载波分量进行恢复和跟踪,并阐述正交相移键控(QPSK)调制和解调过程,最后在Matlab平台上对QPSK进行调制和解调的仿真,计算了在不同信噪比条件下IBOC-QPSK数字传输方式的误码率,通过大量的试验结果表明,在IBOCDAB中QPSK调制具有较高的抗干扰性和传输的可靠性。在公路调频广播中引入IBOC技术使利用调频系统提供宽带数据通信服务成为可能,这将大大提高公路信息服务能力,应用前景广阔。
In order to solve the problem that data communication rate of RDS is low and it is difficult to meet the demand of broadband highway data service, it is proposed to utilize in-band co-frequency (IBOC) technology to realize broadband data service in highway FM broadcasting. Through the research of IBOC-FM / RDS technology in-band with the same frequency, the range of frequency offset of FMHDS subcarrier is determined, and then four times of loop principle , Carrier component recovery and tracking, and describes the quadrature phase shift keying (QPSK) modulation and demodulation process, and finally on the Matlab platform QPSK modulation and demodulation simulation, calculated under different signal-to-noise ratio conditions The bit error rate of IBOC-QPSK digital transmission mode, through a large number of test results, shows that QPSK modulation in IBOCDAB has high anti-interference and transmission reliability. The introduction of IBOC technology in highway FM radio makes it possible to use FM system to provide broadband data communication service, which will greatly improve the highway information service capability and has broad application prospects.