DC Offset Compensation in Millimeter-Wave Transmitters
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Solution Overview
Problem
Existing wireless communication technologies face challenges in rapidly compensating for short-term direct-current offsets and low-frequency components caused by alternating-current coupling, which affect data transmission accuracy, especially in high-speed millimeter-wave communication systems.
Innovation Solution
A transmitting device and receiving device configuration that includes a model storage unit for storing a change model of signal reference levels, a compensation calculating unit to calculate offset compensation values, and an output waveform changing unit to adjust the signal waveform based on these values, allowing for rapid compensation of direct-current offsets at the receiving end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If alternating-current coupling is used to connect digital and analog processing units, then stable operation is achieved by absorbing bias voltage differences, but short-term direct-current offsets and low-frequency components occur causing data transmission errors
Solution Approach 1:
The patent applies preliminary action by performing DC offset compensation at the transmitting end before signal transmission. The transmitting device calculates compensation values based on transmitted data and adds them to pre-compensate for DC offsets, preventing the offsets from causing errors at the receiving end. This proactive approach resolves the contradiction by maintaining stable alternating-current coupling operation while eliminating its harmful effects on data accuracy.
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that mediates between the alternating-current coupling's stability benefit and its DC offset harm. By inserting a compensation calculation and application stage in the transmitting device, the system allows alternating-current coupling to maintain stable operation while the intermediary compensation values neutralize the resulting DC offsets, thus resolving the contradiction between stability and reliability.
2Object-generated harmful factors
If data encoding technique is used to eliminate bit bias, then direct-current offset components are reduced, but encoding efficiency decreases due to insertion of additional bits
Solution Approach 1:
The patent uses copying by creating compensation values that replicate the DC offset effects and then subtracting them from the transmitted signal. Instead of modifying the data encoding to prevent DC offsets (which would reduce efficiency), the system copies the offset characteristics and removes them through subtraction, thereby eliminating DC offset components without sacrificing encoding efficiency.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the signal parameters through addition of compensation values. Rather than changing the encoding scheme to eliminate DC offsets (which would reduce efficiency), the system changes the signal parameters by adding calculated compensation values, thereby reducing DC offset components while maintaining original encoding efficiency.
3Object-generated harmful factors
If scrambler is used to disperse bits uniformly, then bit bias is reduced, but direct-current offset components still occur during short periods causing error rate deterioration
Solution Approach 1:
The patent implements feedback by using the transmitted data itself to generate compensation values that are fed back into the transmission process. The transmitting device calculates compensation values based on the actual transmitted data sequence and applies them in real-time, creating a feedback loop that continuously counteracts DC offset components. This resolves the contradiction by maintaining the scrambler's bit dispersal benefit while using feedback to eliminate the resulting DC offset errors.
Solution Approach 2:
The patent applies preliminary anti-action by calculating and applying compensation values that counteract DC offset components before they can cause errors. The system performs preliminary calculation of compensation values based on transmitted data and adds them in advance, creating an anti-action that prevents the harmful DC offset effects from manifesting, thus resolving the contradiction between bit dispersion and error prevention.
4Speed
If high data rate millimeter-wave communication is implemented, then communication speed increases, but the impact of direct-current offset components on multilevel amplitude decisions becomes significant
Solution Approach 1:
The patent applies preliminary action by compensating for DC offsets at the transmitting end before high-speed transmission. The transmitting device calculates and adds compensation values to counteract DC offsets that would otherwise significantly impact multilevel amplitude decisions at high data rates. This preliminary compensation enables high-speed millimeter-wave communication while maintaining amplitude decision accuracy.
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that mediates between the high data rate requirement and the amplitude decision accuracy. By inserting compensation calculation and application stages as intermediaries in the transmission path, the system allows high-speed communication to proceed while the intermediary compensation values protect the multilevel amplitude decisions from DC offset interference, resolving the contradiction between speed and precision.
Data Source
AI summary
A transmitting device, a receiving device, a circuit device, and a communication method and program. The transmitting device including: a model storage unit for storing a change model for a reference level of a signal on the receiving device end due to coupling between the transmitting device and a receiving device; a compensation calculating unit for calculating a compensation value for offsetting a change in the reference level of the signal constituting a symbol sequence; and an output waveform changing unit for changing an output waveform of the signal constituting the symbol sequence on the basis of the compensation value for the change in the reference level.