Orthogonal Error Compensation in Communicating Apparatus
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Solution Overview
Problem
Existing techniques for orthogonal modulators and demodulators in DPD systems fail to accurately distinguish and separate errors, leading to increased circuit complexity and inefficiency due to shared feedback systems, which are unable to determine whether errors originate from the modulator or demodulator.
Innovation Solution
A communicating apparatus with a local signal generator, orthogonal modulator, demodulator, compensators, and a compensation controller that uses phase-shifted local signals to calculate set values for correcting modulation and demodulation errors, allowing for separate error correction in each component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a shared feedback system is used for both orthogonal modulator and demodulator, then device complexity is reduced, but error detection precision deteriorates because the system cannot distinguish whether errors originate from the modulator or demodulator
Solution Approach 1:
The patent divides the feedback system into separate feedback paths for the orthogonal modulator and orthogonal demodulator. By segmenting the feedback mechanism, the system can independently detect and identify errors from each component, resolving the ambiguity in error origin while maintaining manageable system complexity through modular architecture
2Measurement precision
If separate feedback systems are provided for orthogonal modulator and demodulator, then error detection precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the feedback systems for the orthogonal modulator and demodulator into a unified feedback path that processes both signals. This merging approach allows the system to maintain separate error detection capabilities while reducing overall circuit complexity through shared processing resources and integrated error analysis mechanisms
Data Source
AI summary
A communicating apparatus includes: a local signal generator, an orthogonal modulator, an orthogonal demodulator, and two orthogonal error compensators. The local signal generator generates a first local signal and a second local signal. The orthogonal modulator modulates an input signal into a modulation signal by using the first local signal. The orthogonal demodulator demodulates the modulation signal into a demodulation signal by using the second local signal. Each of the two orthogonal error compensators corrects orthogonal modulation error generated in the orthogonal modulator and an orthogonal demodulation error generated in the orthogonal demodulator respectively. Set values to be set to the orthogonal error compensators are calculated based on (1) a phase difference between the first local signal and the second local signal, (2) the input signal and (3) the demodulation signal.