Transmitting Device Signal Interference Cancellation Feedback
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Solution Overview
Problem
Existing wireless communication systems face significant challenges in effectively reducing signal interference between signals of different communication standards, with conventional methods offering poor performance or high costs.
Innovation Solution
A communication device and method that includes a transmitting circuit for processing baseband signals, a feedback circuit for generating error signals from leakage signals, and a control circuit to generate input signals, utilizing a modified NLMS filter algorithm to eliminate interference between signals of different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If digital pre-distortion or expensive filters are used to reduce signal interference, then signal interference is reduced, but cost increases or performance is poor
Solution Approach 1:
The patent implements a feedback mechanism where the output signal from the second transmitting circuit is fed back to the control circuit. The control circuit processes this feedback signal along with the original baseband signal to generate a corrected input signal for the second transmitting circuit. This closed-loop feedback system enables automatic interference cancellation without requiring expensive external filters or pre-distortion hardware, thus reducing cost while maintaining interference reduction performance.
Solution Approach 2:
The control circuit acts as an intermediary between the transmitting circuits and the feedback signal. It processes the feedback signal containing interference information and generates correction signals that are injected back into the transmission path. This intermediary processing enables sophisticated interference cancellation using simple, low-cost circuitry rather than expensive dedicated filter hardware.
2Productivity
If multiple signals of different frequencies are transmitted simultaneously, then transmission capacity is improved, but signal interference increases
Solution Approach 1:
The feedback circuit continuously monitors the output signal and feeds back interference information to the control circuit. The control circuit uses this feedback to dynamically adjust and cancel interference caused by simultaneous multi-frequency transmissions. This enables the system to maintain high transmission capacity while actively suppressing interference through real-time signal processing rather than requiring frequency separation or time division.
Solution Approach 2:
The control circuit dynamically changes the parameters of the correction signal based on the feedback received. By adjusting the amplitude, phase, and frequency characteristics of the cancellation signal in real-time, the system can effectively counteract interference from multiple simultaneous transmissions across different frequency bands, maintaining both high capacity and low interference.
Data Source
AI summary
A transmitting device, for handling signal interference, comprises a first transmitting circuit, for processing a first plurality of baseband signals, to generate a first plurality of radio frequency signals; a second transmitting circuit, for processing a second plurality of baseband signals and a plurality of input signals, to generate a second plurality of radio frequency signals; a feedback circuit, coupled to the second transmitting circuit, for processing the second plurality of radio frequency signals and a plurality of leakage signals, to generate a plurality of error signals; and a control circuit, coupled to the first transmitting circuit, the second transmitting circuit and the feedback circuit, for generating the plurality of input signals according to the first plurality of baseband signals and the plurality of error signals.