Drm Digital Broadcasting System Of Applied Research

This paper mainly research update an analogue broadcasting transmitter to a DRM ( Digital Radio Mondiale ) digital broadcasting system,without posses a new frenquency in middle wave,and need not equip a new transmitter too.The trasmitter could trasmit digital program while the analogue program.Since the first broadcast station in the world built in America in Dec. 1920, radio was wildly used in all over the world.With several decades's development,the trasmitter and receiver with electronic vacuum become to all solid trasmitter and highly integrated receiver.Media technology has developded on a new level today. The impact of new media make traditionly broadcast incline to eclipse.Audience can't enough to the AM radio with monotony.DRM has become to a international standard of AM broadcast.It modulate by COFDM(Coded Orthogonal Frequency Division Multiplex) technology.With that ,the timbre of radio .The system can transmit low bit rat signal .It saves frequency resource and reduces emission power.DRM broadcasting must substitute analog broadcasting in recently future.But,analog broadcasting transmitter in broadcast station in our country can not be fill with the require of DRM broadcasting system.In order to carry out simulcast,we must update the analog broadcasting transmitter.This paper carefully investigating the key technology of OFDM,and discuss DRM signal transfers and anti-jamming in middle wave channel particularly. This paper researched synchronization arithmetic which filled with DRM charactar during receiveing.The thesis particularl discussed the demand of DRM signal on AM transmitter and their periphery equipment .That need to amend some part of original AM transmitter. The thesis also calculated the power distribution during simulcast. So that ,the broadcast parameter could accord with the first standard which issued by the State Administration...