Patent ID: 8483189
Filing Date: 2013-07-09
Classification: H04B,H04L,H04N,H04W,Y02D

Abstract:
1. A transmission method of an OFDM signal with a frame structure in which a frame contains an integer number of transport stream packets and each frame contains a specific number of symbols, the transmission method comprising: dividing, in time base, a frame into slots, each slot including a specific number of symbols; transmitting a specific service using at least one of the slots; applying transmission channel coding to each specific service to transmit null packets or Packet Identifier (PID) packets before and after a boundary between slots transmitting different services, each PID packet not being related to the different services; inputting a frame synchronization signal, a symbol synchronization signal, and a FFT sampling clock from an OFDM modulator; specifically positioning null packets in a specific slot and before and after the specific slot based on the input frame synchronization signal, symbol synchronization signal and the FFT sampling clock; and dividing and outputting a transport stream according to the number of transmitted services; wherein a number of null packets or a number of PID packets is equal to or greater than a number of packets in slots used for transmitting services by interleaving, and a plurality of the frames form one superframe and the superframe is divided into slots.