Radio Frequency Interference (RFI) in Wireless Communications Training

Radio Frequency Interference (RFI) in Wireless Communications Training


Radio Frequency Interference (RFI) in Wireless Communications Training Course Description

RFI is experienced in all radio communication systems, on the ground, in the air and on the sea, and in space. This Radio Frequency Interference (RFI) in Wireless Communications Training will address all principal uses of radio and wireless and how RFI can be assessed and resolved. The approach is based on solid technical methodologies that have been applied over the years yet considers systems in use today and on the near-term horizon. The objective is to allow the widest variety of radiocommunication applications to operate and co-exist, providing for effective methods of identifying and resolving RFI before, during and after it appears.

Radio Frequency Interference (RFI) in Wireless Communications TrainingRelated Courses:

Duration:3 days

Skills Gained:

The objective of this three-day course is to increase knowledge in the area of RFI and EMI compatibility as well as the risk of potential interference among various wireless systems. The interference cases would result from the operation of one system as against others (e.g., radar affecting land mobile radio, and vice versa; satellite communications affecting terrestrial microwave, and vice versa). It is assumed that all operating equipment has been designed and tested to satisfy common technical requirements, such as FCC consumer certification and MIL STD 461F. As a consequence, RFI is that experienced primarily through the antennas used in communications. The instruction will be conducted in the classroom by Bruce Elbert using PowerPoint slides, Excel Spreadsheets, and link calculation tools such as HD Path and SatMaster. The overall context is spectrum and frequency management to enhance knowledge in identifying and mitigating potential interference threats among various systems. Attendees are expected to have a technical background with prior exposure to wireless systems and equipment.

Customize It:

With onsite Training, courses can be scheduled on a date that is convenient for you, and because they can be scheduled at your location, you don’t incur travel costs and students won’t be away from home. Onsite classes can also be tailored to meet your needs. You might shorten a 5-day class into a 3-day class, or combine portions of several related courses into a single course, or have the instructor vary the emphasis of topics depending on your staff’s and site’s requirements.

Course Content:

Key concepts of evaluating radio frequency interference:

Elements of a wireless or radio communication system – land-based point-to-point and wireless/cellular, space-based systems
Types of electromagnetic interference – natural and man-made (unintentional and intentional)
Interference sources – conducted and radiated, radar signals, RF intermodulation (IM)
Levels of RFI – permissible, accepted, harmful

Signals, Bandwidth and Threshold Conditions

Modulation – analog and digital
Source encoding and error correcting codes
Adaptation to link conditions
Spread spectrum
Eb/N0, protection ratio (C/I)
Computing minimum acceptable signal (dBm at receiver input)

Spectrum Allocations and Potential for Sharing with Acceptable Interference

Current frequency allocations for government and non-government use (1 MHz through 100 GHz)
ITU designated bands for sharing as Primary and Secondary services
Sharing criteria – as mandated, as negotiated

Link Budget equations

Line-of-sight propagation, range equation, power flux density
Evaluating antenna properties and coupling factors
Calculating C/I from antenna characteristics – homogeneous and heterogeneous cases

RFI on Obstructed Paths

Path profiles and obstructions
Diffraction and smooth earth losses
Path analysis tools – HD Path

Atmospheric losses and fading

Constituents of the atmosphere
Tropospheric losses
Near-line-of-sight paths; Ricean fading model
Obstructed paths (in building and concrete canyons); Rayleigh fading

Interference analysis examples between various systems

Service performance in the presence of interference, interference control through design and coordination
Radars vs. land mobile and LTE systems
WiFi and Bluetooth
Satellite communications vs. terrestrial microwave systems

Frequency reuse and signal propagation

Cross polarization on the same path
Angle separation through antenna beam selection
Cellular pattern layout – seven and four color reuse patterns
Non-steady state propagation – scatter, rain-induced interference, ionospheric conditions

How to identify, prevent, and fix common RFI problems

Identifying interference in the real world – detection, location, resolution
Physical separation, orbit separation
Site and terrain shielding
Interference suppression – filtering, analog and digital processing techniques

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Time Frame: 0-3 Months4-12 Months

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