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This model built with the Communications Blockset implements the ETSI EN 300 744 terrestrial digital video broadcasting standard, which utilizes 2048 carrier OFDM.
Digital Video Broadcasting-Terrestrial
2k Mode, Nonhierarchical Transmission
BER
Blocks
COMMUNICATION SOURCES
Bernoulli random binary generator Binary vector noise generator Gaussian noise generator
Triggered read from file COMMUNICATION SINKS
Continuous-time eye and scatter diagrams Discrete-time eye and scatter diagrams Error rate calculation
Triggered write to file SOURCE CODING
A-Law compressor and expander µ-Law compressor and expander Differential encode and decode DPCM encode and decode Sampled quantizer encode Enabled quantizer encode Quantizer decode
CHANNEL CODING Block Coding
BCH encoder and decoder Binary cyclic encoder and decoder Binary RS encoder and decoder Binary linear encoder and decoder Hamming encoder and decoder Integer RS encoder and decoder Convolutional Coding
Algebraic interleaver and deinterleaver General block interleaver and deinterleaver Matrix interleaver and deinterleaver
Matrix helical scan interleaver and deinterleaver Random interleaver and deinterleaver
Convolutional Interleaving
Convolutional interleaver and deinterleaver General multiplexed interleaver and deinterleaver Helical interleaver and deinterleaver
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The Communications Blockset library contains 10 sub-libraries, each providing blocks for different aspects of communications system design.
Here the output of the scatter plot block shows the constellation of a noisy 64-QAM signal.
Communications Blockset Library 2.0 Copyright 1996-2000 The MathWorks, Inc.
101 5
MODULATION
Digital Baseband and Passband Amplitude Modulation General QAM modulator and demodulator M-PAM modulator and demodulator
Rectangular QAM modulator and demodulator Phase Modulation
BPSK modulator and demodulator DBPSK modulator and demodulator DQPSK modulator and demodulator M-DPSK modulator and demodulator M-PSK modulator and demodulator OQPSK modulator and demodulator QPSK modulator and demodulator Frequency Modulation
M-FSK modulator and demodulator Continuous Phase Modulation
CPFSK modulator and demodulator CPM modulator and demodulator GMSK modulator and demodulator MSK modulator and demodulator Analog Baseband and Passband
DSB AM modulator and demodulator DSBSC AM modulator and demodulator FM modulator and demodulator PM modulator and demodulator SSB AM modulator and demodulator
CHANNELS
AWGN channel
Binary symmetric channel Multipath Rayleigh fading channel Rician fading channel Puncture and insert zero Scrambler and descrambler UTILITY FUNCTIONS
Bit to integer converter Data mapper
Here a tutorial example shows how you can quickly build a communication system comprising a channel, modulation scheme, and coding.
This BER plot can be calculated by a MATLAB script that runs your simulation many times for different Eb/No values.
The MathWorks
9869v00 10/00USING THE COMMUNICATIONS BLOCKSET WITH OTHER MATHWORKS PRODUCTS
To run the Communications Blockset, the Communications Toolbox, the Signal Processing Toolbox, Simulink and the DSP Blockset must also be installed.
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by allowing you to build and navigate models hierarchically. You can process all the multi-rate digital signals that are typical in communications systems, such as frames, bits and symbols. And you can make use of Simulink’s continuous time features to model analog signals.
Simulink provides the interactive, block diagram simulation environment including model construction, navigation, simulation management and debugging.
It also provides primitive analog and discrete, linear and non-linear building blocks, such as arithmetic, logic and relational operators, subsystems, Laplace transforms, z-transforms, look-up tables, polynomials and switches. You also have the ability to add your own custom C code or M code modules using the Simulink S-function block. ■
MATLAB® With MATLAByou can create scripts to automate the running of your simulation multiple times to calculate bit-error plots. You can also use it for post processing of simulation data as well as numerous ancillary parameter manipula-tion and generamanipula-tion tasks.
Real-Time Workshop For large models or long simulation runs, Real-time Workshop can generate a standalone C executable for running multiple simulations or for co-simulation with low-level EDA tools.
Stateflow® You can also integrate your physical layer design in Simulink and the Communications Blockset with your link-layer design in Stateflow, The MathWorks control logic design product.
The DSP Blockset This provides all the key DSP blocks common in any digital communications system. These blocks include filters, adaptive filters, interpola-tion, signal operations, transforms, vector math, matrix math, linear algebra, and frequency scopes. The Communications Blockset also makes extensive internal use of the DSP Blockset.
The Communication Toolbox This provides a number of support functions for error correction coding including polynomial creation and Galois field computations.
The Communications Blockset also makes extensive internal use of the Communications Toolbox.
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© 2000 by The MathWorks, Inc. MATLAB, Simulink, Stateflow, Handle Graphics, and Real-Time Workshop are registered trademarks, and Target Language Compiler is a trademark of The MathWorks, Inc. Other product or brand names are trademarks or registered trademarks of their respective holders.
The Communications Toolbox is a library of MATLAB®functions that facilitate the design of communication system algorithms and components.
This toolbox builds upon the powerful capabilities of MATLABand the Signal Processing Toolbox by providing functions to model the components of a communications system’s physical layer. These functions can be used to analyze and develop components in products such as cellular handsets and base stations, cordless phones, digital subscriber lines (DSLs), cable and dial-up modems, local area networks (LANs), wireless LANs, and satellite systems. The toolbox also offers a foundation for research and education in communication systems engineering.
For complete end-to-end communication system-level design, The Mathworks also offers the Communications Blockset.
Together with Simulink, this blockset provides a block diagram simulation environment that is ideal for modeling all the analog and multirate digital signals typical in communication systems, such as frames, bits, and symbols.