Communications Blockset Release Notes

Known Software Problems

This section describes known Communications Blockset 2.0 software problems.

Code Generation Limitations

Several blocks are incompatible with Real-Time Workshop. As a result, Real-Time Workshop cannot generate code for models that include these blocks:

• Discrete-Time Eye and Scatter Diagrams block
• Continuous-Time Eye and Scatter Diagrams block
• Voltage-Controlled Oscillator block
• Multipath Rayleigh Fading Channel block
• Rician Fading Channel block
• Blocks in the Analog Passband and Digital Passband sublibraries of the Modulation library
• Blocks in the CPM sublibrary of the Digital Baseband sublibrary of the Modulation library

Furthermore, blocks in the Analog Passband sublibrary of the Modulation library are not compatible with the Simulink Accelerator.

Limited Frame and Matrix Support

The Communications Blockset provides limited support for matrix and frame-based signals. In a future release, more blocks will support multichannel behavior, and more blocks will be optimized for faster frame-based processing. Release 12 strives to be forward-compatible in the sense that future signal support modes should not invalidate current modes and should minimize the difficulty of upgrading from Release 12 to a future release.

As a consequence of this forward-looking view, some blocks now use strict guidelines to determine the kinds of signals that they accept. One consideration is that if a block will ultimately support frame-based multichannel signals, then a sample-based vector input might potentially represent either a frame of data from a single channel or a set of samples from multiple channels. Therefore, even if such a block does not currently provide such comprehensive signal support, it accepts only frame-based vectors, whose interpretation is unambiguous.

Obsolete Blocks from Previous Manual