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“电视地面传输”这一古老的技术亟待在数字浪潮的洗礼中再铸辉煌。本文提出的“同步多载波扩频(Synchronized Multi-CarrierCDMA)”技术,其中用多载波技术OFDM克服多径效应和建立单频网(SFN)体制(分布化)。采用时——频并行扩频技术(CDMA)带来的快速OFDM符号同步克服在遮蔽间穿行接收的信号重入/再同步困难,采用周期连续导频技术解决高速移动时的多普勒频移跟踪问题和运动衰落(面向移动接收)。采用系统传输流的定秒精确同步技术解决在建立蜂窝单频网(Cellular SFN)传输体制(基站化)的困难,用以解决城市楼群遮蔽的覆盖问题,并为数据回传(双向化)所需的同步、定时、定位提供技术手段。分布化、基站化、双向化——面向移动接收的数字电视地面传输必将创造其辉煌的未来。
The old technology of “TV terrestrial transmission” needs to be rebuilt in the baptism of the digital wave. The “Synchronized Multi-Carrier CDMA” technique proposed in this paper uses multi-carrier OFDM technology to overcome multipath effects and establish a single frequency network (SFN) architecture (distribution). Fast OFDM Symbol Synchronization with Time-Frequency Parallel Spread Spectrum Technology (CDMA) Overcomes Difficulties in Re-entry / Resynchronization of Signals Receiving Between Shades, Using Periodic Continuous-Pilot Technique to Solve Doppler Shift at High Speed Tracking issues and movement decline (for mobile reception). The use of fixed-second precise synchronization of system transport streams solves the difficulty of establishing a Cellular SFN transmission system (base stationization) to solve the problem of coverage of urban buildings and provides data backtracking (bidirectional) The required synchronization, timing, positioning to provide technical means. Distributed, Base Station, Bi-Directional - Digital terrestrial transmission for mobile reception is bound to create its glorious future.