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Time And Frequency Allocation Trace For Vector Signal Analyzer

IP.com Disclosure Number: IPCOM000181447D
Publication Date: 2009-Apr-02
Document File: 6 page(s) / 187K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention relates, in general, to analysis of wireless signals. More specifically, the present invention relates to Vector Signal Analyzer (VSA) software used for analyzing wireless signals.

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Time and frequency allocation TRACE

for Vector signal analyzer

Iyappan Ramachandran

Ronald F Van Der Meulen

The present invention relates, in general, to analysis of wireless signals. More specifically, the present invention relates to Vector Signal Analyzer (VSA) software used for analyzing wireless signals.

VSA software is generally used for performing time, frequency, and modulation domain analysis. For example, Agilent’s 89600 VSA software is used for performing such analyses on wireless signals like those based on standards like Long-term Evolution (LTE) or World Interoperability for Microwave Access (WiMAX). The VSA software is capable of measuring various signal properties, such as amplitude, phase, frequency, of complex wireless signals and of performing complex analysis to determine performance metrics such as error vector magnitude (EVM).  In addition to displaying signal performance metrics like EVM on output traces, the software also displays information about allocation of resources among various users (an important characteristic of wireless signals based on standards like LTE and WiMAX) through a demodulation properties window. Hence, it may be checked whether a resource is allocated according to a desired allocation scheme. The demodulation properties window, however, is an input window that is used by a user to enter characteristics of the wireless signals, while the allocations trace is an output result.

The disclosed invention provides a resource allocation trace of wireless channels, i.e., data channels and control channels, provided by various communication standards, presented as an output result. The resource allocation trace depicts time and frequency allocations for various control and data channels. The proposed resource allocation trace is represented in an output window along with other traces such as a constellation diagram trace, an EVM spectrum trace, and a frame summary trace. Various wireless channels are represented on the proposed trace using different colors. The color to channel mapping is represented through the frame summary trace. The frame summary trace, in addition to the color to channel mapping, includes other measurements such as EVM. When a frequency allocation and/or time allocation for a channel needs to be determined, a color that represents the channel is determined from the frame summary trace. Thereafter, the frequency allocation and/or time allocation is determined by analyzing the resource allocation trace. Further, the analysis of the resource allocation trace is facilitated by using a zoom-in option and a marker coupling option provided in the output window. Additionally, the resource allocation trace may be analyzed simultaneously with other traces such as a constellation diagram trace and an EVM spectrum trace.

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