Version 4.1 (R2008b) Communications Blockset Software :: Communications Blockset Release Notes (Communications Blockset)

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Version 4.1 (R2008b) Communications Blockset Software

This table summarizes what is new in Version 4.1 (R2008b):

New Features and Changes	Version Compatibility Considerations	Fixed Bugs and Known Problems	Related Documentation at Web Site
Yes Details below	No	Bug Reports Includes fixes.	Printable Release Notes: PDF Current product documentation

New features and changes introduced in this version are

Providing Polyphase Decimation in the Raised Cosine Receive Filter Block

Polyphase decimation improves the filter efficiency in terms of simulation speed and quality of code generation.

The block uses FIR decimation under the mask if Offset sample is set to zero offset or Framing is set to Maintain input frame size.

The block uses Digital filter under the mask when Framing is set to Maintain input frame rate and Offset sample is set to a non–zero number.

Initialization Enhancements to BCH blocks

The BCH Encoder and Decoder block masks now contain the Disable generator polynomial checking option.

Each time a model initializes, the BCH Encoder or Decoder block performs a polynomial check. Selecting Disable generator polynomial checking disables the polynomial check. For larger codes, disabling the check speeds up the simulation process.

Refer to the BCH Encoder or BCH Decoder help page for more information.

New Doppler Spectrum Capabilities for Rayleigh and Rician Fading Channels

In addition to Jakes Doppler spectrum (which previous software versions support), the Multipath Rayleigh Fading Channel block and Multipath Rician Fading Channel block now support the following Doppler spectrum shapes per path:

Jakes restricted
Jakes asymmetrical
Flat
Rounded
Gaussian
Bigaussian

Additionally, you can now specify different Doppler spectrum shapes for each path in the model.

For more information, refer to the Multipath Rayleigh Fading Channel block and Multipath Rician Fading Channel block help pages.

Per Path Specification For Rician Channels

The Multipath Rician Fading Channel block now contains vector Rician, K-Factor, and doppler shift parameters, allowing the different Rician paths to be faded using different parameters.

Previously, only the first path in a multipath channel had Rician attributes. With this upgrade you can specify Rician attributes for each path in the channel.

Code Generation Support for Signals Greater than 32 Bits

C code generation and the Simulink Accelerator and Rapid Accelerator modes are now supported for fixed-point and integer word lengths up to 128 bits. In other words, you can now generate code for anything you can simulate using Communications Blockset™ blocks.

Convolutional Encoder Changes

The Convolutional Encoder block contains two new parameters: Output final state and Specify initial state via input port.

Output final state is available for all operation modes except Terminate trellis by appending bits . When you select Output final state, the output signal specifies the output state for the block.

Specify initial state via input port is only available in Truncated operation mode. When you select Specify initial state via input port the input signal specifies the starting state for every frame in the block.

New Data Support Table

The Communications Blockset Data Type Support Table is now available through the Simulink model Help menu. The table provides information about data type support and code generation coverage for all Communications Blockset blocks. To access the table, select Help > Block Support Table > Communications Blockset or Help > Block Support Table > All Tables.