Digital Synchronization for Interference Cancellation in Receivers
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Solution Overview
Problem
Analog-based synchronization solutions in communication systems introduce clock jitter and errors in signal sampling, and existing interference cancellation methods struggle with synchronization across different clock domains, particularly in full duplex and multi-channel systems.
Innovation Solution
A digital domain synchronization method for receivers, which includes a cancellation signal generator and an equalizing and canceling circuit to perform clock domain conversion, channel equalization, and digital interference cancellation, ensuring that signals and interference signals are synchronized before cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog-based synchronization is used to adjust clock phase and frequency, then synchronization between transmitter and receiver is achieved, but clock jitter is introduced and signal sampling errors increase
Solution Approach 1:
The patent replaces the analog-based synchronization mechanism with a digital domain synchronization mechanism. Instead of using analog phase-locked loops that directly adjust clock sources (which introduce jitter), the invention uses digital signal processing to estimate timing errors and compensate for them in the digital domain, thereby eliminating the introduction of clock jitter while maintaining synchronization accuracy
Solution Approach 2:
The patent introduces a timing error estimator as an intermediary component that measures the timing error between transmitter and receiver clocks without directly adjusting the clock sources. This intermediary allows the system to achieve synchronization through digital compensation rather than direct analog clock adjustment, preventing the introduction of jitter
2Adaptability or versatility
If interference cancellation is performed using cancellers operating in different clock domains, then echo and cross-talk cancellation is enabled, but synchronization errors occur due to clock domain mismatches
Solution Approach 1:
The patent creates a universal digital baseband processing platform that handles multiple functions including synchronization, equalization, and interference cancellation within the same clock domain. By converting all signals to a common digital clock domain, the system achieves multi-functionality without the synchronization errors that would arise from operating different functions in separate clock domains
Solution Approach 2:
The patent merges the synchronization function with the interference cancellation function by operating both in the same digital domain. Instead of having separate analog synchronization circuits and separate interference cancellers operating in different clock domains, the invention combines these functions in a unified digital processing architecture, eliminating clock domain mismatches
Data Source
AI summary
A digitally synchronized receiving device and an associated signal processing method are provided. The digitally synchronized receiving device can receive data transmitted by a transmitter. The transmitter and the receiving device belong to a first clock domain and a second clock domain respectively. The receiving device performs synchronization in a digital manner, so as to deal with the problem of the analog solution in prior arts and the synchronization for interference cancellation.