System and method for providing terrestrial digital broadcasting service using single frequency network

A terrestrial digital broadcasting method using a single frequency network, comprising the steps of:

• a) inserting a field synchronization header to transport stream (TS) transmitted to a plurality of transmitting stations in a predetermined data field period N in a broadcasting station, wherein N is a natural number;
• b) detecting the field synchronization header and synchronizing starting points of the TS inputted to each transmitting station in the plurality of transmitting stations;
• c) synchronizing the TS outputted to receiving stations by generating initialization symbols of a predetermined length every predetermined data field period M with respect to the inputted signal, and M is a natural number,
• wherein the initialization symbols are generated by performing switching to input values stored in a memory of a trellis coded modulation (TCM) encoder, the TCM encoder including a first feedback loop to initialize a memory of the TCM encoder after receiving the input values stored in the memory of the TCM encoder from the performed switching, and input values stored in a memory of a precoder instead of the inputted signal, the precoder including a second feedback loop to initialize a memory of the precoder after receiving the input values stored in the memory of the precoder from the performed switching, and
• when the memory of the precoder is initialized by the second feedback loop, two initialization symbols are generated in every predetermined data field period M;
• and
• d) broadcasting the synchronized TS to the receiving stations.

A trellis encoder, comprising:

• a precoder which includes one memory;
• a trellis coded modulation (TCM) encoder which includes two memories;
• where the trellis encoder is configured to generate initialization symbols of a predetermined length in a predetermined data field period M and synchronize a transport stream outputted to receiving stations, where M is a natural number, wherein the trellis encoder includes:
• a first switching unit for initializing output values of the trellis coded modulation (TCM) encoder and the memory of the TCM encoder performing switching to values stored in the memory of the TCM encoder instead of input signals to the TCM encoder every M period, wherein the TCM encoder includes a first feedback loop to initialize the memory of the TCM encoder after receiving the values stored in the memory of the TCM encoder from the first switching unit;
• a second switching unit for initializing output values of the precoder and the memory of the precoder by performing switching to values stored in the memory of the precoder instead of input signals to the precoder every M period, wherein the precoder includes a second feedback loop to initialize the memory of the precoder after receiving the values stored in the memory of the precoder from the second switching unit;
• and
• wherein when the memory of the precoder is initialized by the second feedback loop, the trellis encoder generates two initialization symbols in the predetermined data field period M.

A trellis encoder initialization method, comprising:

• creating a first feedback loop in a precoder by switching a content of a memory of the precoder to an input of the precoder where the feedback loop is created to initialize memory of the precoder after receiving values stored in the memory of the precoder from a first switching unit;
• and
• creating a second feedback loop in a trellis coded modulation (TCM) encoder by switching the content of the memory of the TCM encoder to an input of the TCM encoder where the second feedback loop is created to initialize memory of the TCM encoder after receiving values stored in the memory of the TCM encoder from a second switching unit;
• and
• wherein when memory of the precoder is initialized by the first feedback loop, the TCM encoder generates two initialization symbols in a predetermined data field period.

A digital broadcasting system including a switchable trellis encoder, the encoder comprising:

• a precoder which includes one memory;
• a trellis coded modulation (TCM) encoder which includes two memories;
• where the trellis encoder is configured to generate initialization symbols of a predetermined length in a predetermined data field period M and synchronize a
• transport stream outputted to receiving stations, and M is a natural number, wherein the trellis encoder includes:
• a first switching unit for initializing output values of the trellis coded modulation (TCM) encoder and the memory of the TCM encoder performing switching to values stored in the memory of the TCM encoder instead of input signals to the TCM encoder every M period, wherein the TCM encoder includes a first feedback loop to initialize the memory of the TCM encoder after receiving the values stored in the memory of the TCM encoder from the first switching unit;
• a second switching unit for initializing output values of the precoder and the memory of the precoder by performing switching to values stored in the memory of the precoder instead of input signals to the precoder every M period, wherein the precoder includes a second feedback loop to initialize the memory of the precoder after receiving the values stored in the memory of the precoder from the second switching unit;
• and
• wherein when the memory of the precoder is initialized by the second feedback loop, the trellis encoder generates two initialization symbols in the predetermined data field period M.