Frame Structure of OFDM Signal and Transport Signal Suitable for Hierarchical Transmission

Abstract

The BST-OFDM (Band Segmented Transmission-OFDM) method is considered for use in a transmission system in Japan, taking into account requirements for terrestrial digital broadcasting, such as providing HDTV services and multimedia services for mobile reception This method makes hierarchical transmission and partial reception possible This paper describes a transport signal which is compliant with MPEG-2 Systems and which is applicable to hierarchical transmission It proposes the following First, the introduction of a frame structure to both an OFDM signal and a transport signal, to assign TS packets to the proper transmission layer Second, the insertion of a number of null packets, to interface a transport signal between a multiplexer and modulator with a single constant clock Third, the introduction of an algorithm for specifying the allocation of the TS packets in a multiplex frame, to regenerate the correct transport stream on the receiver side easily