Implicit Beamforming Calibration via Explicit Sounding
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Solution Overview
Problem
Existing methods for calibrating implicit beamforming in wireless communication systems require specialized equipment and hardware, are time-consuming, and need to be repeated when conditions change, limiting their practicality and flexibility.
Innovation Solution
A method using an explicit beamforming system to calibrate an implicit beamforming device without specialized equipment or additional hardware, by sending a sounding packet to compute and load compensation parameters, enabling implicit beamforming even in devices that do not support explicit beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If specialized calibrated equipment is used to calibrate transmit and receive paths, then calibration accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The system uses its own internal resources (sound card, processing unit, existing transmit/receive paths) to perform calibration without external specialized equipment. The beamforming device calibrates itself by generating test signals, capturing them through its own receive path, and computing compensation parameters internally.
Solution Approach 2:
The sound card and processing unit perform multiple functions: they serve as both the calibration equipment and the beamforming device. The same hardware components used for normal wireless communication are utilized for calibration, eliminating the need for separate specialized calibration equipment.
2Measurement precision
If calibration is performed using traditional methods with specialized equipment, then compensation parameters are accurately determined, but calibration time increases
Solution Approach 1:
The calibration process is accelerated by using the device's own fast digital signal processing capabilities to generate, capture, and analyze test signals. The method skips the time-consuming steps of external equipment setup and signal transmission by performing all calibration operations internally and rapidly.
3Productivity
If calibration is done during manufacture assuming stability, then initial setup time is reduced, but adaptability to changing conditions decreases
Solution Approach 1:
The calibration system transitions from a static, one-time calibration approach to a dynamic, on-demand calibration capability. The device can perform calibration at any time during its operational lifetime, adapting to changes in environmental conditions, hardware aging, or other factors that may affect calibration accuracy.
4Adaptability or versatility
If additional hardware is added to loop transmit signal back to receiver, then calibration capability is improved, but device complexity increases
Solution Approach 1:
The invention extracts the calibration functionality from the normal communication path and implements it using existing internal resources. Instead of adding a physical hardware loopback connection, the method uses software-controlled signal routing through the device's existing sound card and processing unit to achieve the same calibration effect without additional hardware.
Data Source
AI summary
A first embodiment is a method of calibrating an implicit beamforming wireless system wherein the implicit wireless system comprises a beamformer and a beamformee. The method comprises associating the beamformer with the beamformee, sending a sounding packet from the beamformer to the beamformee, receiving a sounding response at the beamformer wherein the sounding response contains explicit channel state information as estimated by beamformee, computing implicit channel state information at the beamformer based on transmissions from the beamformee, passing explicit and implicit channel state information into the beamformer, computing a set of compensation parameters and loading the set of compensation parameters into the beamformer thereby enabling the beamformer to implicitly beamform to a device that does not support explicit beamforming.