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Version 4.2 (R2009a) Communications Blockset Software

This table summarizes what is new in Version 4.2 (R2009a):

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.	Printable Release Notes: PDF Current product documentation

New features and changes introduced in this version are

• Orthogonal STBC Capability

• Constellation Visualization for Linear Modulator Blocks

• New Rounding Modes for M-PAM, R-QAM, and OQPSK Demodulator blocks

• Support for Convergent Rounding, Simplest Rounding, and MATLAB-Style Rounding Modes

• Fading Channel Blocks Now Support Bell-shaped Doppler spectrum

• DPSK Modulator Baseband Block Enhancements

Orthogonal STBC Capability

Communications Blockset now includes Orthogonal Space-Time Block Coding (OSTBC) Combiner and Encoder blocks. Space-time block coding is an accepted multiple-input multiple-output (MIMO) technology adopted by standards for both indoor and outdoor environments. The addition of these blocks allows you to model systems for emerging MIMO standards. For more information, see the OSTBC Combiner and OSTBC Encoder help pages.

Constellation Visualization for Linear Modulator Blocks

The linear modulator blocks now provide the capability to visualize a signal constellation from the block mask dialog. The following blocks support constellation visualization:

• BPSK Modulator Baseband

• General QAM Modulator Baseband

• M-PAM Modulator Baseband

• M-PSK Modulator Baseband

• QPSK Modulator Baseband

• Rectangular QAM Modulator Baseband

New Rounding Modes for M-PAM, R-QAM, and OQPSK Demodulator blocks

The Rounding mode parameter on the M-PAM, R-QAM, and OQPSK modulator blocks now have two additional options, Zero and Ceiling.

• Ceiling rounds the result of a calculation to the closest representable number in the direction of positive infinity.

• Zero rounds the result of a calculation to the closest representable number in the direction of zero.

Support for Convergent Rounding, Simplest Rounding, and MATLAB-Style Rounding Modes

Communications filter blocks, digital baseband amplitude modulation, and digital baseband phase modulation blocks now support convergent rounding mode and simple rounding mode.

• Gaussian Filter

• General QAM Demodulator Baseband

• Ideal Rectangular Pulse Filter

• Integrate and Dump

• M-PAM Demodulator Baseband

• OQPSK Demodulator Baseband

• Raised Cosine Transmit Filter

• Raised Cosine Receive Filter

• Rectangular QAM Demodulator Baseband

• Windowed Integrator

Fading Channel Blocks Now Support Bell-shaped Doppler spectrum

The Multipath Rayleigh Fading Channel block and the Multipath Rician Fading Channel block now support bell-shaped Doppler spectrum.

DPSK Modulator Baseband Block Enhancements

Compatibility Considerations

When selecting Single as the Output Data Type for the M-DPSK Modulator Baseband, DBPSK Modulator Baseband, or DQPSK Modulator Baseband, the block produces an output value that varies slightly from previous releases.

Version 4.3 (R2009b) Communications Blockset Software

Version 4.1 (R2008b) Communications Blockset Software

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