Analog Domain Interference Cancellation for Wireless Receivers
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Solution Overview
Problem
Existing wireless communication devices struggle to effectively cancel co-channel and adjacent-channel interference in the analog domain, leading to increased baseline noise, signal saturation, and compromised signal quality.
Innovation Solution
A method and device that introduce co-channel and/or adjacent-channel signals as reference signals in the analog domain to recover interference signals, which are then canceled directly in the radio frequency analog domain, improving signal quality received by the receiving antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signal processing is used to cancel echoes, then echo cancellation is achieved, but signal baseline noise increases and signal quality is compromised
Solution Approach 1:
The patent replaces digital signal processing operations with analog domain processing. Specifically, it uses analog echo cancellation by directly processing RF signals in the analog domain through a radio frequency analog signal processing circuit, avoiding the need for digital-to-analog conversion and subsequent analog processing that introduces noise and signal degradation.
Solution Approach 2:
The patent introduces an analog domain signal processing circuit as an intermediary between the receiving antenna and the analog-to-digital converter. This intermediary circuit performs echo cancellation in the analog domain before signals are digitized, preventing interference from entering the digital processing chain and thereby avoiding noise introduction.
2Reliability
If digital-to-analog conversion and frequency conversion operations are performed, then analog signals are obtained for echo cancellation, but signal quality is compromised and amplitudes are compressed
Solution Approach 1:
The patent eliminates the need for digital-to-analog conversion and frequency conversion operations by performing echo cancellation directly in the analog domain. The radio frequency analog signal processing circuit processes RF signals without requiring conversion to digital domain and back, thereby avoiding signal quality degradation and amplitude compression associated with these conversion operations.
3Reliability
If reference signals are processed in digital domain, then echo signals can be generated, but delay, phase, and amplitude differences cannot be compensated
Solution Approach 1:
The patent performs echo cancellation operations in the analog domain where delay, phase, and amplitude adjustments can be made directly to RF signals. The radio frequency analog signal processing circuit can compensate for these parameters in the analog domain, providing more accurate compensation compared to digital domain processing.
4Productivity
If receiving equipment processes strong interference signals, then co-channel and adjacent channel signals are received, but equipment saturation occurs and signal reception becomes impossible
Solution Approach 1:
The patent applies preliminary anti-action by canceling echo and interference signals in the analog domain before they can saturate the receiving equipment. The radio frequency analog signal processing circuit performs subtraction of interference signals from received signals, preventing strong interference from overwhelming the analog-to-digital converter and subsequent processing stages.
Solution Approach 2:
The patent introduces an analog domain signal processing circuit as an intermediary between the receiving antenna and the analog-to-digital converter. This intermediary performs interference cancellation before signals enter the digital processing chain, preventing equipment saturation while maintaining the ability to receive weak desired signals.
Data Source
AI summary
A method and device for eliminating co-frequency and adjacent frequency interference in an analog domain, in the case that a wireless communication device with a receiving antenna, that is, a transmitting point of a master device, detects and judges the presence of co-frequency and/or adjacent frequency interference signal sources on site, collects the reference signals of the same frequency and/or adjacent frequency from the interference signal sources by means of cable direct connection or adding an antenna, and obtains the analog signals of the same frequency and/or adjacent frequency interference after interference signal recovery processing, then, in the analog domain, the received signal received by the receiving antenna of the master device is directly subtracted from the interference analog signal of the same frequency and/or adjacent frequency to complete the analog interference cancellation process, so as to obtain the interference canceled RF analog signal.