The presence of potentially interfering signals is a fact of life in all radio communications, whether that communication is occurring over licensed spectrum or over license-exempt spectrum. In addition to installation techniques such as antenna selection and positioning that are used to mitigate the effects of interference, Exalt offers a range of features and capabilities that serve to minimize the likelihood that other RF signals will interfere with the reliable operation of a microwave path.
High interference rejection (all Exalt radios)
Interference rejection, typically expressed in terms of carrier-to-interference ratio (C/I), is a measure of how close in strength an interfering signal can be to the received signal before the received signal experiences errors. Lower C/I ratios are better, as it means that the interfering signal can “get closer” to the received signal without causing a problem.
Exalt license-exempt radios are characterized by C/I ratios that are typically 15 - 30 dB lower than those of competing radios, meaning that Exalt radios are 10x to 1000x inherently more resistant to interfering signals.
Exalt vs. competitors’ interference rejection characteristics
Built-in spectrum analyzer (included with all license-exempt radios)
Although a spectrum analyzer does not itself eliminate or reduce interference, its availability as part of the radio enables installers to immediately identify available spectrum, dramatically speeding deployment time. Many organizations do own stand-alone spectrum analyzers however, in practice, that equipment is not always available or accessible. With an embedded spectrum analyzer, installers and technicians always have a tool at hand to characterize the environment during troubleshooting.
Exalt built-in spectrum analyzer screen shot
Selectable channel bandwidth
Once the built-in spectrum analyzer has been used to characterize the available spectrum for a license-exempt deployment, Exalt makes it easy for technicians to select a channel bandwidth that meets both the capacity requirements and the available spectrum constraints by offering users the ability to either:
- Select a narrow channel, in the case of hostile RF environments, reducing the likelihood of encountering interference and conserving valuable spectrum or longer paths; or
- Select a wide channel, as available spectrum allows, enabling even better throughput performance.
Most other high performance radios simply don’t offer this level of flexibility and instead are limited to fixed channel bandwidths.
1 MHz tuning resolution
Exalt’s 1 MHz tuning resolution feature opens up the band to tens or even hundreds of center frequencies. Whereas most competing products are limited to a number of pre-defined channel locations, Exalt radios provide radio operators with fine, granular control of the operating center frequency, greatly increasing their ability to find and operate in a “clean” channel.
Configuration window showing 1 MHz tuning resolution