US 8,428,160 B2 · Multi-carrier digital mobile multimedia broadcast system and the digital information transmission method thereof

Abstract

The present invention discloses a multi-carrier digital multimedia broadcast system and the digital information transmission method thereof. After RS encoding and byte interleaving, LDPC encoding, bit interleaving and constellation mapping to an upper layer of data streams in turn, the obtained data symbol is multiplexed with scattered pilots and continual pilots which include the system information to form an OFDM frequency domain symbol and scrambled; an OFDM time domain symbol is generated by IFFT transforming, and after inserted with the frame head to build a time slot, it is connected to form a signal frame of the physical layer; the signal frame of the physical layer is transmitted after being low-pass filtered and orthogonal upconverted. The system and method thereof provide wireless broadcast with high quality such as audio, video and multimedia data and the like for mobile, fixed and portable receivers, and can use the satellite transmission and terrestrial transmission method for transmitting. The method utilizes the LDPC OFDM scheme, and the system applies the microwave and large scale integrated circuit technologies while fulfills the needs for low cast and high performance.

Claims47

Dependent claims

A multi-carrier digital mobile multimedia broadcast system comprising a transmitter and a receiver, the transmitter comprising:

a RS encoding and byte interleaving module for RS encoding and byte interleaving an upper layer data stream based on a physical logical channel;
a LDPC encoder for LDPC encoding the data outputted from the RS encoding and byte interleaving module to obtain bit data;
a bit interleaver for bit interleaving the bit data outputted from the LDPC encoder;
a constellation mapping module, in which the data outputted from the bit interleaver is constellation mapped;
a frequency-domain symbol generator for multiplexing together a discrete pilot, a continuous pilot containing system information and data symbol being constellation mapped to form an OFDM frequency-domain symbol;
a scrambler for scrambling the OFDM frequency-domain symbol using pseudo-random sequence;
an IFFT transformer for performing IFFT transformation to the frequency-domain symbol outputted from the scrambler to generate an OFDM time-domain symbol;
and
a time-domain framing device for adding a beacon in formt of the OFDM time-domain symbol to form a time slot and concatenating the time slots to form a physical signal frame, the beacon comprising a transmitter identification signal and synchronous sequences, the transmitter identification signal being obtained by performing BPSK mapping, IFFT transforming and circular extending with the frequency-domain random sequence in turn.

6 more elements

A digital information transmission method for a multi-carrier digital mobile multimedia broadcast system, comprising following steps:

RS encoding and byte interleaving an upper layer data stream with a RS encoding and byte interleaving module based on a physical logical channel, in which row numbers of module is determined by a byte interleaving mode and a LDPC code rate;
LDPC encoding the byte interleaved data by a LDPC encoder to obtain bit data;
bit interleaving the LDPC encoded bit data by a bit interleaver;
constellation mapping the bit interleaved data by a constellation mapping module;
multiplexing together discrete pilots, continuous pilots containing system information and data symbols being constellation mapped by a frequency-domain symbol generator to form an OFDM frequency-domain symbol;
scrambling the multiplexed OFDM frequency-domain symbol with a scrambler using a pseudo-random sequence;
performing IFFT transformation to the scrambled frequency-domain symbol to generate an OFDM time-domain symbol by an IFFT transformer;
concatenating the times slots which are formed by inserting a beacon to the time-domain OFDM symbol with a time-domain framing device to form a physical signal frame, the beacon comprising a transmitter identification signal and synchronous sequences;
and
transmitting the physical signal frame after low-pass filtering and orthogonal up-converting.

7 more elements

Dependencies are inferred from the claim text.

Multi-carrier digital mobile multimedia broadcast system and the digital information transmission method thereof

Life of this patent

Multi-carrier digital mobile multimedia broadcast system and the digital information transmission method thereof

Life of this patent

Abstract

Claims47