MATLAB Block Use in VSS
This application note discusses problem solving in wireless communications systems, such as how a given impairment (e.g. noise, fading) affects the performance (e.g. BER versus Eb/No) of your communications system. The method used combines the power of Visual System Simulator (VSS) and MATLAB1 into a co-simulation environment that accommodates both dataflow block diagrams (VSS) and text-based procedures in MATLAB, the language of technical computing.

Modulated Signals
This example shows how you can apply modulated signals to nonlinear circuits using harmonic balance simulation. Standard modulation signals are included for QPSK, BPSK, and several other common formats including application specific files for GSM, IS95, IS136, 802.11x and other standards... 

Pulsed RF
This example shows how the use Microwave Office (MWO) to simulate a modulated input using using Harmonic Balance. This example is a pulsed RF example where the RF is at 500 MHz, and the RF is being pulsed with a 10 Hz square wave. 

RF Inspector Double Conversion
This example illustrates the new capabilities of Visual Systems Simulator (VSS) to analyze spur generation in systems. RF Inspector, a component of VSS is used for this analysis. This new technology for VSS is most important when dealing with complex systems making use of multiple conversions.

Signal and Noise Scaling for Link Error Analysis in VSS
This document describes the signal power and noise scaling conventions used in the Visual System Simulator (VSS). In this note, we discuss the fundamental signal representation used in VSS. In addition, the signal and noise power relationships in an end-to-end communication link simulation are described. Both concepts are comprehensively illustrated with two simulation examples. In order to make this note somewhat self-contained, some elementary background from statistics is presented.

Simulation of Convolutional Codes in VSS
This document describes the modeling and simulation of short constraint length convolutional codes used in conjunction with Viterbi decoding in the Visual System Simulator (VSS). After a brief review of the history and application of convolutional codes, a detailed description of VSS models for encoding/decoding of these codes is presented. Step-by-step examples illustrate how to construct simulations and analyze results.

Two Amplifiers in a Chain
This example illustrates the various methods available in both Microwave Office (MWO) and Visual Systems Simulator (VSS) to perform a two-tone analysis on cascaded RF blocks. In this case, two amplifiers are included in a chain with a filter and two lossy elements. The graphs compare the simulation results from harmonic balance (MWO), complex envelope (VSS), and the new RF Inspector (VSS).

WCDMA Reference Design
Freescale Reference Design for WCDMA Base Station. This example uses both the Visual System Simulator and the Circuit Simulator (either MWO or AO) so you can view single tone and modulated signal results of this amplifier.