Phase Noise Pre-Compensation in Wireless Systems
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Solution Overview
Problem
Conventional phase noise compensation in wireless systems, especially in MIMO-OFDM systems operating at high carrier frequencies, is complex and requires estimation from reference signals, which is inefficient and requires extensive circuitry across multiple wireless stations.
Innovation Solution
Implementing phase noise pre-compensation at one wireless station by using a phase noise management resource that receives and processes phase noise information to adjust signals, thereby alleviating the need for phase noise adjustment at the receiving station, using a predictor and coefficient generator to derive and apply phase noise adjustment information to sub-carrier frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phase noise compensation is implemented at both transmitting and receiving stations, then phase noise compensation accuracy is improved, but device complexity and circuitry requirements increase
Solution Approach 1:
The patent applies preliminary action by performing phase noise compensation at the transmitting station before signal transmission, rather than compensating at the receiving station after reception. The transmitting station estimates phase noise using reference signals and applies compensation to transmitted signals, thereby eliminating the need for complex phase noise estimation and compensation circuitry at the receiving station while maintaining compensation accuracy.
2Measurement precision
If phase noise estimation is performed using reference signals at the receiving station, then phase noise compensation is achieved, but processing time and computational complexity increase
Solution Approach 1:
The patent moves the phase noise estimation and compensation process to the transmitting station, which performs estimation using reference signals and applies compensation before signal transmission. This eliminates the need for time-consuming phase noise estimation at the receiving station, thereby reducing processing time and computational complexity while maintaining estimation accuracy.
Solution Approach 2:
The patent implements feedback by having the transmitting station continuously estimate phase noise using reference signals and adjust compensation based on the estimated phase noise characteristics. This feedback mechanism enables accurate phase noise compensation without requiring complex real-time estimation at the receiving station, thus reducing processing time.
3Reliability
If phase noise compensation is implemented at both ends of the communication link, then compensation reliability is improved, but the number of wireless stations requiring circuitry increases
Solution Approach 1:
The patent applies preliminary action by implementing phase noise compensation at the transmitting station before signal transmission. The transmitting station estimates phase noise using reference signals and applies compensation to transmitted signals, thereby achieving reliable compensation without requiring the receiving station to implement complex compensation circuitry. This reduces the number of wireless stations that need sophisticated circuitry while maintaining compensation reliability.
Data Source
AI summary
According to one configuration, a system includes a first wireless station in communication with a second wireless station. A phase noise predictor model such as associated with the first wireless station receives phase noise information. The phase noise information captures an estimate of: i) first phase noise associated with a first wireless station, and ii) second phase noise associated with a second wireless station. Based on the received phase noise information, the predictor produces phase noise adjustment information. The predictor applies the phase noise adjustment information to adjust (compensate) a signal of the first wireless station. Adjustment of the signal results in phase noise adjustment with respect to both the first phase noise associated with the first wireless station and the second phase noise associated with the second wireless station.