Communications Blockset Release Notes

Known Software Problems

This section describes known Communications Blockset 2.0.1 software problems.

Code Generation Limitations

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

• Continuous-Time Eye and Scatter Diagrams block
• Multipath Rayleigh Fading Channel block
• Rician Fading Channel block
• Triggered Read from File block
• Triggered Write to File block
• Voltage-Controlled Oscillator 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

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 12.1 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 12.1 to a future release.

As a consequence of this 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.

Upgrading from an Earlier Release

Communications Blockset 2.0 Release Notes