Beamforming Calibration for 5G Transceiver Chains
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Solution Overview
Problem
Current 5G NR wireless communication systems face challenges in maintaining accurate beamforming characteristics due to silicon variations and temperature changes, leading to performance degradation across different units and over time.
Innovation Solution
The technology involves determining and adjusting inter-chain gain and phase/delay differences across transceiver chains in a wireless communication device, using calibration methods to baseline differences during production and compensate for time-related changes, thereby mitigating the effects of silicon variations and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beamforming is implemented using multiple transceiver chains, then communication performance is improved, but inter-chain variations due to silicon differences and temperature changes cause beamforming accuracy to degrade
Solution Approach 1:
The system performs preliminary calibration during the manufacturing process to establish baseline gain and phase characteristics for each transceiver chain. This preliminary action creates a reference profile that compensates for silicon variations before the device is deployed, preventing accuracy degradation from occurring in the first place
Solution Approach 2:
The system continuously monitors inter-chain gain and phase differences during operation and dynamically adjusts transceiver chain parameters to maintain beamforming accuracy. This feedback mechanism detects drift caused by temperature changes and compensates in real-time, counteracting the harmful effects of environmental variations
2Manufacturing precision
If transceiver chains are calibrated during production to baseline inter-chain differences, then initial beamforming performance is improved, but time-related changes such as aging and temperature variations cause performance degradation
Solution Approach 1:
The system performs preliminary calibration during the manufacturing process to establish baseline gain and phase characteristics for each transceiver chain. This preliminary action creates a reference profile that compensates for silicon variations before the device is deployed, preventing accuracy degradation from occurring in the first place
Solution Approach 2:
The system dynamically changes operational parameters of transceiver chains based on monitored conditions. By adjusting gain and phase parameters in response to temperature changes and aging effects, the system maintains stable beamforming performance despite drift in physical component characteristics over time
3Adaptability or versatility
If multiple transceiver chains are used to cover wide bandwidth, then system capability is improved, but determining inter-chain differences across frequency becomes more complex
Solution Approach 1:
The system divides the wide bandwidth into multiple frequency sub-bands and performs calibration separately for each sub-band. This segmentation approach breaks down the complex wideband calibration problem into manageable narrowband segments, allowing accurate inter-chain difference determination across the entire bandwidth without overwhelming complexity
Solution Approach 2:
The system performs calibration at discrete frequency points and sub-bands rather than continuously across the entire bandwidth. This partial action approach provides sufficient calibration accuracy for beamforming operations while significantly reducing the complexity and measurement time compared to full continuous-band calibration
Data Source
AI summary
A base station includes an array of transceiver chains, each characterized by a bandwidth and including a transmit chain and a receive chain. The base station determines, at each center frequency and sub-bandwidth covering the bandwidth: a first set of interchain transmit gain and phase/delay differences across transmit chains; and a first set of interchain receive gain and phase/delay differences across the receive chains. The base station then determines, in a same manner as the first determining: a second set of inter-chain transmit differences; and a second set of inter-chain receive differences. The base station adjusts each transmit chain by the difference between the second set of inter-chain transmit differences and the first set of inter-chain transmit differences. The base station adjust each receive chain by the difference between the second set of inter-chain receive differences and the first set of inter-chain receive differences.