Overview

Communications System Toolbox enables you to model and visualize noisy SISO and MIMO channels having Rayleigh, Rician, or WINNER II fading profiles. Multiple Doppler spectrum shapes are available. In addition, you can model RF impairments arising from actual hardware implementation. Communications System Toolbox provides quantitative tools for measuring system performance. Use graphical utilities such as constellation and eye diagrams to visualize the effects of various impairments and corrections. Communications System Toolbox includes tools using either MATLAB or Simulink for signal conditioning filtering. This Toolbox includes several functions, objects, and blocks that can help you design and use filters. Other filtering capabilities are in the Signal Processing Toolbox and the DSP System Toolbox. Without propagation delays, both Hilbert filters and raised cosine filters are noncausal. This means that the current output depends on the system's future input. In order to design only realizable filters, the hilbiir function delays the input signal before producing an output. This delay, known as the filter's group delay, is the time between the filter's initial response and its peak response. Some linear modulator blocks provide the capability to visualize a signal constellation right from the block mask. This Constellation Visualization feature allows you to visualize a signal constellation for specific block parameters. In digital communications, an eye diagram provides a visual indication of how noise might impact system performance. Use the EyeScope tool to examine the data that an eye diagram object contains. EyeScope shows both the eye diagram plot and measurement results in a unified, graphical environment. You can import, and compare measurement results for, multiple eye diagram objects. A scatter plot or constellation diagram is used to visualize the constellation of a digitally modulated signal. To produce a scatter plot from a signal, use the scatterplot function or use the comm.ConstellationDiagram System object. A scatter plot or constellation diagram can be useful when comparing system performance to a published standard, such as 3GPP or DVB. Communications System Toolbox software provides a plotting function that helps you visualize the characteristics of a fading channel using a GUI. The Frequency Response plot displays the channel spectrum by taking a discrete Fourier transform of the channel filter coefficients. For the MIMO case, this transform is performed for the specified transmit-receive antenna pair. You can use the Communications System Toolbox, Simulink Coder, and Embedded Coder products together to generate code that you can use to implement your model for a practical application. For instance, you can create an executable from your Simulink model to run on a target chip.

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9781982066826

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