ViaSat has filed a patent for methods, systems, and devices that cancel interference of high-power input signals in the analog domain. The patent describes a method of interference cancellation that involves receiving an analog signal with a signal of interest and interfering signals, determining an update to a reference signal based on the high-power interfering signal, generating a modified reference signal, and generating an interference-canceled signal. The patent aims to improve signal quality in the presence of high-power interference. GlobalData’s report on ViaSat gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on ViaSat, satellite communication systems was a key innovation area identified from patents. ViaSat's grant share as of September 2023 was 53%. Grant share is based on the ratio of number of grants to total number of patents.

Interference cancellation method for high-power signals in analog domain

Source: United States Patent and Trademark Office (USPTO). Credit: ViaSat Inc

A recently filed patent (Publication Number: US20230318647A1) describes a method and device for interference cancellation in wireless communication systems. The method involves receiving an analog signal through an antenna, which includes a signal of interest and one or more interfering signals. One of the interfering signals is a high-power interfering signal with a signal power greater than 15 dBm. The method then determines an update to at least one parameter of a reference signal corresponding to the high-power interfering signal. This update is determined by minimizing a cost function that measures the difference between the reference signal and the high-power interfering signal. The parameters that can be updated include gain, phase, or delay. Based on the updated parameters, a modified reference signal is generated and coupled with the analog signal to generate an interference-canceled signal that includes the signal of interest.

The method also includes performing amplification and filtering operations on the interference-canceled signal to generate an amplified and filtered interference-canceled signal. This amplified and filtered signal is then subjected to a digital interference cancellation operation to mitigate the effects of each of the interfering signals. The interference cancellation process can be performed iteratively multiple times.

The patent also describes a device for interference cancellation that includes a high-power analog interference canceller, a radio-frequency stage, and a digital interference canceller. The high-power analog interference canceller receives the analog signal comprising the signal of interest and the interfering signals, and outputs an interference-canceled signal. The radio-frequency stage amplifies and filters the interference-canceled signal, while the digital interference canceller performs a digital interference cancellation operation on the amplified and filtered signal.

Additionally, an apparatus for interference cancellation is described, which includes an antenna and a processor. The antenna receives the analog signal, and the processor determines the update to the parameters of the reference signal based on the high-power interfering signal. The processor generates a modified reference signal and couples it with the analog signal to generate an interference-canceled signal.

Overall, this patent presents a method and device for interference cancellation in wireless communication systems, which can help improve the quality and reliability of wireless transmissions by mitigating the effects of interfering signals.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.