Learn more about Communications Blockset

Version 3.1 (R14SP2) Communications Blockset Software

This table summarizes what's new in Version 3.1 (R14SP2):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	Yes Summary	Bug Reports Includes fixes.	No

New features and changes introduced in this version are

• Channel Visualization Added to Multipath Rayleigh Fading Channel Block

• Multipath Rayleigh Fading Channel Block Performance Improvement

• 26 Blocks Generate Embeddable Real-Time Workshop C-code

• C Data Type Support for 26 Blocks

• Some Blocks Now Work in a Triggered Subsystem

• New Gardner Symbol Timing Recovery Demo

• commdigbbndam2 and commdigbbndpm2 Libraries Updated

• Improvements and Changes to the Multipath Rayleigh Fading Channel Block

• Discrete-Time VCO Block

• Voltage Controlled Oscillator Block Renamed to Continuous-Time VCO

• CPM Modulator Baseband and GMSK Modulator Baseband Blocks

Channel Visualization Added to Multipath Rayleigh Fading Channel Block

Added a channel visualization option to the Multipath Rayleigh Fading Channel block, which allows for use of the new channel visualization tool.

Multipath Rayleigh Fading Channel Block Performance Improvement

Increased the signal processing speed for the Multipath Rayleigh Fading Channel block by a factor of 2 to 10.

26 Blocks Generate Embeddable Real-Time Workshop C-code

In this release, the following blocks are now inlined, and will produce optimized embeddable Real-Time Workshop C-code. See for details.

• AWGN Channel and Multipath Rayleigh Fading Channel blocks in the Channels library

• Integrate and Dump block in the Communications Filters library

• Error Rate Calculation block in the Communications Sinks library

• Poisson Integer Generator block in the Random Data Sources sublibrary

• Kasami Sequence Generator and PN Sequence Generator blocks in the Sequence Generators sublibrary

• Convolutional Encoder and Viterbi Decoder blocks in the Convolutional Coding sublibrary

• Binary-Input RS Encoder, Integer-Input RS Encoder, Binary-Output RS Decoder, and Integer-Output RS Decoder blocks in the Block Coding sublibrary

• All blocks in the Block Interleaving sublibrary

• All blocks in the Convolutional Interleaving sublibrary

• All blocks in the Digital Baseband Amplitude Modulation sublibrary

• All blocks in the Digital Baseband Frequency Modulation sublibrary

• All blocks in the Digital Baseband Phase Modulation sublibrary

• Interlacer, Deinterlacer, Puncture, Insert Zero, and Derepeat blocks in the Sequence Operations library

• Bit-to-Integer Converter and Integer-to-Bit Converter blocks in the Utilities library

C Data Type Support for 26 Blocks

Added Native C data type support for the same 26 S-functions listed above. Updated six complete demos to include this new support.

Some Blocks Now Work in a Triggered Subsystem

Updated the following blocks so that they will now work in a triggered subsystem:

• Integrate and Dump block in the Communications Filters library

• Error Rate Calculation block in the Communications Sinks library

• All blocks in the Random Data Sources sublibrary

• All blocks in the Noise Generators sublibrary

• All blocks in the Sequence Generators sublibrary

• All blocks in the Block Coding sublibrary

• Convolutional Encoder and Viterbi Decoder blocks in the Convolutional Coding sublibrary

• Helical Interleaver and Helical Deinterleaver blocks in the Convolutional Interleaving sublibrary

• All blocks in the Digital Baseband Amplitude Modulation sublibrary

• All blocks in the Digital Baseband Phase Modulation sublibrary except for the OQPSK Modulator Baseband and OQPSK Demodulator Baseband blocks

• Interlacer, Deinterlacer, and Derepeat blocks in the Sequence Operations library

Note that triggered subsystems do not support multirate operation, so any mode of the above blocks that requires multirate operation will not work.

New Gardner Symbol Timing Recovery Demo

A new demo, gardner_intdelay, illustrates Gardner symbol timing recovery for a symbol frequency offset.

commdigbbndam2 and commdigbbndpm2 Libraries Updated

Compatibility Considerations

The libraries commdigbbndam2 and commdigbbndpm2 have been updated to commdigbbndam3 and commdigbbndpm3, respectively. The modulators and demodulators in these new libraries do not have the Samples per symbol parameter.

Improvements and Changes to the Multipath Rayleigh Fading Channel Block

The Multipath Rayleigh Fading Channel block is now two to five times faster.

It now has options to output complex path gains and channel filter delay data.

Compatibility Considerations

It now accepts arbitrarily small Doppler (but not zero) and inherits sample time instead of setting it.

It now only accepts frame-based input, and thus does not support sample-based input. To work around this, use the frame conversion block of the Signal Processing blockset to reformat the signal. Note that the Rician Fading Channel block remains the same.

It now outputs the same waveform as the toolbox Rayleigh fading channel, and will therefore be a different waveform when compared to the same block in the previous version. Note that the statistical characteristics of the waveform should be identical to those of the previous version's block output.

Discrete-Time VCO Block

Compatibility Considerations

Changes are made to the Discrete-Time VCO block so that the phase accumulator wraps around and the block does not use a clock. The block does not allow continuous-time inputs.

Voltage Controlled Oscillator Block Renamed to Continuous-Time VCO

Compatibility Considerations

The Voltage Controlled Oscillator block was renamed to be consistent with the Discrete-Time VCO block.

CPM Modulator Baseband and GMSK Modulator Baseband Blocks

Compatibility Considerations

For the CPM Modulator Baseband block, the number of input symbols must be a factor of the length of the symbol prehistory parameter. This is true for cases when the input frame has fewer symbols than the length of the Symbol prehistory parameter. The block will now error out if this condition is not met. This also applies to the GMSK Modulator Baseband block, because it depends on the CPM Modulator Baseband block.

Version 3.2 (R14SP3) Communications Blockset Software

Version 3.0.1 (R14SP1) Communications Blockset Software

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