Communications Blockset Release Notes

Functionality Changes in Specific Blocks

Aside from signal support and naming issues, some blocks have changed the way that they behave:

• The Continuous-Time Eye and Scatter Diagrams and Discrete-Time Eye and Scatter Diagrams blocks process complex signals, whereas their counterparts before Release 12 (called Eye-Diagram Scatter Plot and Sample-Time Eye-Diagram Scatter) processed real vectors that listed in-phase and quadrature components separately.
• The blocks for Reed-Solomon and BCH coding no longer have a second input port for an enabler signal. The change affects the Binary-Input RS Encoder, Binary-Output RS Decoder, Integer-Input RS Encoder, Integer-Output RS Decoder, and BCH Decoder blocks.
• The Scrambler, Descrambler, and PN Sequence Generator blocks no longer have a trigger input. The Scrambler and Descrambler blocks no longer have a state output. The PN Sequence Generator block produces output from the last register in the generator, not the first.
• The Convolutional Encoder and Viterbi Decoder blocks have new interfaces because they can now accept a more general trellis description of a convolutional encoder.
• The Version 1.4 Error Rate Calculation block considers a vector input to be a sample, whereas the current block considers a vector input to be a frame of multiple samples. For vector inputs of length n, a Receive delay parameter value of k in the Version 1.4 block is equivalent to a Receive delay of k*n in the current block.
• The Voltage-Controlled Oscillator block now uses the cosine, not sine, function to produce its waveform. This change affects the phase of the output signal.
• The blocks in the Synchronization library no longer use a Gain at the output parameter. The remaining parameters that define characteristics of the voltage-controlled oscillator have changed slightly. Also, the Baseband PLL and Linearized Baseband PLL blocks now include three output ports instead of one, to match the Phase-Locked Loop and Charge Pump PLL blocks.

New Signal Support

Block Name Changes Since Previous Manual