Optimal structural pattern of dvb-t modulator

FIELD: information technologies.

SUBSTANCE: method is realised using the following facilities, where a DVB-T modulator comprises serially joined units, an interface, a randomiser, a Reed-Solomon encoder, a convolution interleaver, a convolution coder, a bit interleaver, a symbol interleaver, a QAM shaper, a calculator of reverse quick Fourier transform (RQFT calculator), a digital to analogue converter (DAC), a high-frequency unit (HF unit) and a shaper of pilot signals at the inlet of the QAM shaper, and also the following units are additionally introduced: a unit of packets breakdown, receiving information from the interface and sending it to the randomiser and a control unit, a register receiving signals from the randomiser and sending a signal to the Reed-Solomon coder and the convolution interleaver, the control unit receiving information from the unit of packets breakdown, and outlets are connected to all modulator units.

EFFECT: reduced requirements to a computing device due to optimisation of processes of synchronising operation of all units in whole, using less efficient computing devices.

1 dwg

 

The invention relates to techniques for television and sound broadcasting and is intended for use in digital radio and digital television.

The invention relates to techniques for television and sound broadcasting and can be used at the location of the receiver in a moving transport in urban apartments with dense development, megalocephaly, as well as in areas with difficult terrain, where in these conditions, the TV used on today's systems cannot provide satisfactory reception quality.

The known method of television broadcast EN 2219676 C2, which includes blocks of signal compression, multiplexing receiving compressed information signal TV, omegaseamaster channel coding, modulation carrier using orthogonal frequency division channels (OCRC), adding the phase increments of the random variable that is assigned from a set of pre-known random variables, and radiation.

The closest in technical essence to the claimed technical solution is the way digital television broadcasting standard DVB-T (Digital Video Broadcasting (DVB)). Personnel structure, channel coding and modulation for digital terrestrial television. European standard (Telecommunications series). ETSI. EN 300 44 v 1.6.1 (2009-01), including a serially connected blocks interface, randomization, encoder reed-Solomon, convolutional interleaver, convolutional encoder, bit interleaver, symbol interleaver, the CAM driver, the transmitter inverse fast Fourier transform (computer OBPF), digital to analog Converter (DAC), high-frequency unit (RF unit), a former pilot signals at the input of the driver CAM.

The disadvantage of this method is that each of the blocks of the modulator independently finds in the input clock parcel, which leads to the complexity of the algorithms used in all blocks of the modulator and, consequently, their higher frequencies, causing an increasing requirement for a computing device.

The present invention is the creation of a DVB-T modulator, which will decrease the demands on the computing device by finding sync bursts in a single unit process optimization and synchronization of all units as a whole and, as a consequence, the use of less high-speed computing devices.

The technical result achieved by the invention is to increase the efficiency of formation of the digital signal and reducing the performance requirements of the computing device.

p> The invention consists in that in the DVB-T modulator, containing blocks of the interface, randomization, encoder reed-Solomon, convolutional interleaver, convolutional encoder, bit interleaver, symbol interleaver, the CAM driver, the transmitter inverse fast Fourier transform (computer OBPF), digital to analog Converter (DAC), high-frequency unit (RF unit), a former pilot signals at the input of the driver CAM, inputs of block partitioning packages, register and control unit. The input block is split packages connected to the output interface, and an output unit connected to randomization and the control unit. The input register is connected to the output of the block randomization, and outputs connected to the blocks of the encoder reed-Solomon and the convolutional interleaver. A control unit connected to the output of block partitioning packets, and outputs connected to all of the blocks of the modulator.

1 shows a DVB-T modulator.

DVB-T modulator contains connected in series interface 1, the block partitioning packages 2, randomization 3, register 4, the encoder reed-Solomon 5, convolutional interleaver 6, convolutional encoder 7, the bit interleaver 8, symbol interleaver 9, the driver CAM 10, the transmitter inverse fast Fourier transform (OBPF) 12, a digital-to-analogue Converter (DAC) 13, an RF unit 14, the former pilot-C the signals at the input of the driver CAM 10, and the control unit 15, which receives information from block partitioning packages 2 and has connections with all the blocks of the modulator.

The work of the DVB-T modulator is as follows. The input signal is supplied to the interface unit 1, then at block partitioning packages 2, where the input sequence is a synchronization information, which is received in the control unit 15, and are formed of a group of packages for the correct operation of all other blocks of the modulator. The control unit 15 receives the synchronization information and organizes synchronous operation of all the blocks of the modulator, thereby reducing the overall load on each block separately.

After passing randomization 3 information entered in the register 4, in which the recording is made at time tRASand reading is a block encoder reed-Solomon 5 for time tcode. Since tRAS>tcodeand start recording and reading are the same, the block encoder reed-Solomon 5 manages to get stored in the register information before it is overwritten with new information coming from randomization 3.

Encoder reed-Solomon 5 does not modify the input information, and only adds to the end of the sequence of test bytes. In this invention with the register 4 is also fed to the convolutional interleaver 6 for time is I t lane. Since tRAS>tlane>tcodeand start recording and reading are the same, the block convolution of the interleaver 6 manages to get stored in the register 4 information before it is overwritten with new information coming from randomization 3, and begins processing the information received before the end of the work block encoder reed-Solomon 5, and when the block encoder reed-Solomon 5 will be ready to give the test sequence of bytes, block convolution of the interleaver 6 takes this information and puts it in specific places its output information sequence.

Block breaker 2 is responsible for the initial search, synchronization information in the input stream and passes it on one common to all the control unit 15, and forms a bundle of packages for operation of the modulator. The control unit 15 receives the signal of the beginning of the next package (groups of packets) of data and provides synchronous operation of all the blocks of the modulator in accordance with the algorithms of each block separately.

In addition, the control unit 15 sets the parameters necessary for operation of block algorithms needed in this particular case.

Thus, in the proposed device are reduced requirements for the performance of each block separately because OTS is dtvia search synchronizing information of each block, which in turn affects the overall performance required for the implementation of a computing device. Use case 4 allows you to increase the performance of the proposed DVB-T modulator due to parallel processing of information in the programmable logic integrated circuit. Due to the synchronous operation of all units, clocked by a common control unit 15, significantly reduced the requirements for a computing device.

DVB-T modulator contains blocks connected in series interface, randomization, encoder reed-Solomon, convolutional interleaver, convolutional encoder, bit interleaver, symbol interleaver, the CAM driver, the transmitter inverse fast transform, Fourier (computer OBPF), digital to analog Converter (DAC), high-frequency unit (RF unit), a former pilot signals at the input of the driver CAM, characterized in that the structural scheme introduced: block partitioning packages, register and control unit and the input block is split packages connected to the output interface, and outputs the block partitioning packages connected to randomization and the control unit, in addition, the input register is connected to the output of the block randomization and outputs is connected to the blocks of the encoder reed-Solomon and the convolutional interleaver, the input control unit connected to the yhou block partitioning packages and outputs is connected to all of the blocks of the modulator.



 

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