基于频谱动态分配的带内同频FM数字广播方案  

Scheme for IBOC FM Digital Broadcasting based on Dynamic Spectrum Allocation

作　　者：方伟伟[1] 蔡超时[1] 杨刚[1] 王菲[1] 

机构地区：[1]中国传媒大学,北京100024

出　　处：《广播与电视技术》2014年第2期111-119,共9页Radio & TV Broadcast Engineering

摘　　要：HD Radio标准中使用的"带内同频(IBOC)"技术不要新的频谱资源同时实现数字和模拟音频广播,是调频模拟广播数字化的佳选择。然而HD Radio要至少侧有400kHz的频道间隔,在中国的线城市和主要的欧洲国家很难达到要求,不利于数模同播方案的大范围推广。本文提出种基于频谱动态分配的FM带内同频数字广播方法,其核心是根据同频模拟信号的参数动态调整数字信号的带宽,并引入心理声学模型作为调整的判决依据,使同播的模拟信号音质在不劣于HD FM Radio的条件下拓展了数字信道,为实现300kHz信道间隔的数模同播创造了条件。本文测试了300kHz信道间隔的IBOC系统的射频保护率,讨论了300kHz信道间隔进行带内同频的可行性。HD Radio standard is the best choice for FM analog broadcasting digitalzation, because it realizes synchronously analog and digital broadcasting with in-band on-channel(IBOC) technology. However, HD Radio requires at least 400 kHz channel bandwidth on one side, which is diffi cult to meet in the Chinese metropolis and major European countries. Therefore, HD Radio is not suitable for large-scale promotion of IBOC scheme. This paper presents a spectral dynamic allocation scheme for IBOC FM digital broadcasting. The proposed scheme adjusts dynamically the bandwidth of digital signal according to the real-time parameters of analog signals, and introduces psychoacoustics algorithm as the decision criterion for digital bandwidth, and aims to realize IBOC scheme in 300 kHz channel spacing, under the premise of the quality of analog signals not inferior to the HD FM Radio. At last, this paper describes a test about the RF protection ratio for IBOC system with 300 kHz channel spacing, and discusses the feasibility to realize IBOC technology in 300 kHz channel bandwidth.

关 键 词：HD RADIO 带内同频(IBOC) 频道间隔 非线性 频谱动态分配 心理声学 

分 类 号：TN934.3[电子电信—信号与信息处理]