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Wireless in Washington...and the surrounding Portland area
Signals Research Group, LLC, Sep 2009, Pages: 54
This is an individual issue from Signals Ahead, which can be viewed by following the link below.
In this issue of Signals Ahead the publisher provides what they believe is by far the most comprehensive independent performance benchmark assessment of a commercial Mobile WiMAX network. To put things into perspective, the publisher's results and analysis are based on 46 unique test scenarios during which the publisher transferred 46.3GB of data over the course of a four-day period. Most of the publisher's testing took place in vehicular or pedestrian modes, meaning that they were able to cover nearly 420 miles of Clearwire's network in Portland, Oregon while operating up to four concurrent WiMAX solutions, many of which are not yet commercially available.
For this endeavor, Rohde&Schwarz (R&S), a leading test equipment manufacturer, provided its TSMW Universal Radio Network Analyzer and ROMES drive test software to help collect the data. With its sophisticated suite of tools, the publisher was able to capture and analyze critical information about the overall RF environment in the network, which they could not have otherwise possibly captured.
Given the highly differentiated information that the publisher provides, this report is critical reading for:
- Spectrum holders who have yet to deploy a broadband wireless network
- Mobile operators who must compete with a Mobile WiMAX operator
- Organizations that want to understand how the critical building blocks of LTE (e.g., OFDMA and MIMO) actually behave in a real-world, commercial network
- WiMAX operators who want insight into how their network could perform
- WiMAX infrastructure, device and chipset suppliers who are looking for competitive intelligence
- Financial institutions who are making short-term or strategic investment decisions
- Government regulators who are responsible for spectrum or broadband service policies
- Anyone with a passion for wireless
This 54-page report is critical reading for the following reasons:
The Data. In order to be as objective as possible, the publisher publishes results for virtually all of the tests that they conducted. Key Performance Indicators (KPIs) that the publisher provides, and which could not be obtained without the tools that the publisher had at their disposal, include average DL and UL throughput, RSSI and CINR values, uplink transmit power, availability of higher order modulation schemes and the presence of MIMO Matrix A/B, not to mention indications of whether or not co-channel and/or inter-symbol interference (ISI) exists. The publisher also analyzes the distribution of recorded DL/UL data rates and provide plots of throughput versus CINR for additional insight.
The Devices. The publishertested five WiMAX devices - 3 USB dongles and 2 notebook/netbook computers with an embedded module. Many of the devices/chipsets were and currently are pre-commercial solutions or they have just been released into the market. While not a focus of the publisher's study, the publisher compares and contrast how the results vary across device/chipset platforms.
The Plots. For many of the test scenarios the publisher uses the geo-coded information to plot some of the most important KPIs using Google Earth, thus providing a rich and powerful means of examining the results while showing with precise detail where they were actually obtained in the network.
The Analysis. Although not every operator or supplier is committed to a WiMAX strategy, they must inevitably compete in a market where the technology exists. While the results in this issue are specific to Clearwire's network in Portland, Oregon the publisher's analysis of these results is applicable to operators around the world, and it provides some keen insight into how OFDMA-based technologies (e.g., LTE) behave in a real-world network.
This report preview contains three figures from the actual report. The first figure shows where we were conducting the tests and the speed we were driving or walking while conducting the tests. In the report we use a similar approach to plot many of the more interesting KPIs pertaining to network performance for a number of the test scenarios.
The next two figures illustrate another method that we use to illustrate some of the KPIs in the report, although for obvious reasons we have obscured the actual KPIs, not to mention altered the results to make the information the figures contain meaningless. These figures are followed by the report’s Table of Contents, List of Tables, and List of Figures.
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