Dynamic spectrum access method based on HD Radio system

Abstract

The invention discloses a dynamic spectrum access method based on an HD Radio system. The HD Radio system achieves the aim of in-band common-frequency transmission of analog signals and digital signals. According to the in-band common-frequency transmission mode, the digital signals are fixedly arranged at the position deviating from the carrier frequency by 130-200KHZ and are coupled with the FM analog signals through a fixed combination mode; however, as the spectral bandwidth of the FM analog signals changes along with program signals, the bandwidth is large in change range. An ITU-R BS. 1387-1 psychological acoustics model serves as a support, the access position of a spectrum of the digital signals is changed dynamically on the time dimension, the analog audio quality after signal modulation is analyzed, the bandwidth which can be saved by signal transmission on the premise of not affecting the quality of audio signals is counted and obtained, and supporting is provided for improving the transmission capacity of the digital signals in the HD Radio system.

Description

technical field [0001] The invention relates to a wireless communication system, in particular to a dynamic frequency spectrum access method for an in-band co-frequency system. Background technique [0002] In the mixed mode of HD-Radio broadcasting, a fixed combination method is used to perform In-Band On-Channel (IBOC) transmission of analog and digital signal spectrums. However, since the spectral bandwidth of the FM analog signal varies with the program signal, the bandwidth varies widely. With a high probability of time, the bandwidth of the analog FM signal is much smaller than the boundary bandwidth of the analog and digital signal spectrum specified in the mixed mode. In this case, the real-time variation of the bandwidth of the analog signal results in a large amount of vacant spectrum. At the same time, since the spectral bandwidth occupied by the analog signal changes in real time, while the digital signal spectrum is fixed at the same spectral position, the aud...

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Problems solved by technology

[0010] However, since the spectral bandwidth of the FM analog signal changes with the program signal (such as frequency, amplitude), under a large time probability, the bandwidth of the analog FM signal is much smaller than the boundary bandwidth of the analog and digital signal spectrum specified in the standard

In this case, the real-time variation of the bandwidth of the analog signal not only results in a large amount of empty spectrum, but also results in a large variation in the audio quality heard by the human ear over time

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