【摘要】 提出一种上下兼容的中波数字广播系统方案。该方案的数字基带传输方式为COFDM,与DRM和IBOC相同,射频调制仍采用保留载波的双边带调幅,不需要对现有广播发射机进行改动或更换,接收机可沿用目前中波收音机的包络检波或采用相干解调,实现复杂度低,便于形成规模生产。讨论了该方案实现的关键技术,并给出了发展和应用前景。更多还原

【Abstract】 A system of digital AM broadcasting in MW band compatible with traditional analogue AM broadcasting and all digital broadcasting in future is proposed.COFDM technique is adopted for digital base-band transmission in the scheme,which is also used in DRM or IBOC,and the double-sideband AM method in RF is retained.The existing broadcast transmitters need not to be changed or replaced.Receivers that use envelope detection or coher-ent demodulation of single sideband may be mass-produced.The key techniques for implementing the project and the applications of this system are particularly discussed.更多还原