ETSI EN 303 883 Short Range Devices Using Ultra Wide Band

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Summary of ETSI EN 303 883 RF Wireless Compliance Testing

This ETSI intentional radiator testing procedure evaluates the measurement techniques and procedures for Ultra Wide Band (UWB) signal formats. This is done to comply with the given transmission limits given in the current regulation.

The UWB technologies used for these applications are broken down into two main groups: 

1. Impulse-derived technologies.
2. Frequency modulated/carried-based.

Generally, combinations of these systems are possible.

Impulse Derived (Carrier-less)

Impulse-derived UWB technology consists of a series of impulses. These are created from a pulsar oscillator or a dc voltage step. The rise time from these can be modified to provide the maximum useful number of spectral emission frequencies. This derived impulse is then modified by the use of filters to locate the resulting waveform. The filter can be a stand-alone filter or incorporated into an antenna design to reduce emission outside the designated frequency range.

Modulation techniques include pulse positioning in time, pulse suppression, or other techniques to convey information. This technology is suitable for direct and non-direct line of sight communications.

Simple short pulses whereby one can modify/modulate by:

• A pulse from/pulse shape
• Pulse duration
• Pulse trains (i.e. number of pulses per burst)
• Pulse amplitude
• Pulse positioning/spacing, time/pulse hopping
• Direct sequence

Frequency Modulated/Carrier-Based

Under this category, the following systems can be covered:

• Phase shift keying
• Frequency hopping/stepping
• Frequency Modulated Continuous Wave (FMCW), can also be intermittent
• Orthogonal Frequency Division Multiplex (OFDM) and similar
• Random pseudo-noise generation, dithering, or international pre-programmed direct sequencing

Combinations may also be applied.

Scope of ETSI EN 303 833 Testing Requirements

The test modulation used should be representative of the normal use of the equipment. This may result in the highest mean transmit power spectral density which would be available in normal operation.

The highest mean transmit power spectral density is also likely to be affected by frame/package length, inter-packet gaps, normal and burst modes. The manufacturer needs to declare this information to lead to the highest mean spectral density.

Equipment should be capable of continuous RF transmission. This is done to minimize the test time required to determine the highest levels of emission from the device. For transmitters that have multi-modulation schemes incorporated, the manufacturer should declare the modulation scheme to be used for each test.

ETSI EN 303 883 Wireless RF Laboratory Testing Conditions

Testing is performed under normal testing conditions. These conditions include having reliable power sources for stand-alone equipment and normal temperature and humidity conditions.

If a power source is used, it is applied as close to the battery terminals as possible. During tests, its voltages are maintained within a tolerance of ±1% relative to the voltage at the beginning of each test.

Normal temperature and humidity conditions must be any convenient combination of temperature and humidity within specified limits. These limits include 15-35 degrees Celsius and 20% to 75% relative humidity

Expert EMC ETSI EN 303 883 Compliance Services

In addition to ETSI 303 883 testing, Keystone has a full scope of expertise including multiple transmitters, pre-approved radio modules, and licensed exempt radios. Our team strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling.

If you are ready to start your RF compliance wireless testing, please request a quote. For more information on why so many companies partner with Keystone Compliance, contact us.