Method for equalization of complementary carriers in am compatible digital audio broadcast system

提供了一种对兼容于调幅的数字广播信号进行均衡的方法，该方法包括具有第1频谱的调幅射频信号，调幅射频信号具有被模拟节目信号调制的第1载频，位于包含第1频谱的带宽以内的多组数字调制的载频信号，第1组数字调制的载频信号包括互补的各信号，并且处于第1频谱的范围内，第2和第3组数字调制的载频信号包括非互补的各信号，并且处于第1频谱之外。本方法包括下列各步骤：产生第1信号，它代表了兼容于调幅的数字广播信号的同相分量；产生第2信号，它代表了兼容于调幅的数字广播信号的正交分量；使用第1和第2信号作为实部和虚部输入，进行第1和第2信号的快速傅里叶变换，以产生代表频域数据的多个已变换的信号；通过将所述多个已变换的信号乘以一个均衡矢量，来处理所述多个已变换的信号，所述均衡矢量包括多个均衡器系数；以及通过对非互补的各信号的矢量进行内插，来更新用于互补的各信号的均衡器的各系数。本发明还包括利用上述方法的射频接收机的操作，执行上述方法的装置，以及利用上述方法的射频接收机。 A method is provided for equalizing an amplitude modulated compatible digital broadcasting signal which includes an amplitude modulated radio frequency signal having a first frequency spectrum, the amplitude modulated radio frequency signal having a first carrier modulated by an analog program signal, a plurality of digitally modulated carrier signals positioned within a bandwidth which encompasses the first frequency spectrum, a first group of the digitally modulated carrier signals including complementary signals and lying within the first frequency spectrum, and second and third groups of the digitally modulated carrier signals including non-complementary signals and lying outside of the first frequency spectrum. The method includes the steps of producing a first signal representative of in-phase components of the amplitude modulated compatible digital broadcasting signal; producing a second signal representative of quadrature-phase components of the amplitude modulated compatible digital broadcasting signal; using the first and second signals as the real and imaginary inputs to take the Fast Fourier Transform of the first and second signals to produce a plurality of transformed signals representative of frequency domain data; processing the transformed signals by multiplying the transformed signals by an equalization vector, with the equalization vector comprising a plurality of equalizer coefficients; and updating the equalizer coefficients used for the complementary signals by interpolating coefficients of the vector for the non-complementary signals. The invention also encompasses the operation of radio frequency receivers which utilize the above method, as well as apparatus that performs the above method and radio frequency receivers which utilize the above equalization method.