Frequency Sub-Band Channel Estimation for Coherent Localization
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Solution Overview
Problem
Existing frequency hopping methods in wireless communication networks face challenges in achieving phase coherency of the received signal with minimal effort, which is necessary for accurate localization of user equipment, especially in multipath environments.
Innovation Solution
A method and receiver that estimate the transmission channel across multiple sub-bands to reconstruct a coherent phase basis, compensating for relative phase errors between sub-bands, allowing for a broader bandwidth and improved localization accuracy using time and angle of arrival measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If frequency hopping is used to transmit broadband signals, then bandwidth is increased, but phase coherency between sub-bands deteriorates
Solution Approach 1:
An intermediary phase compensation mechanism is introduced between frequency hops. The system estimates phase errors occurring during frequency transitions and applies compensation to restore phase coherency. This mediator (phase compensation algorithm) allows the system to maintain phase stability while utilizing frequency hopping for bandwidth expansion.
Solution Approach 2:
The system dynamically adjusts phase parameters to compensate for frequency hopping effects. By changing phase correction values based on observed phase errors during frequency transitions, the system maintains coherent phase relationships across different frequency sub-bands while preserving the bandwidth benefits of frequency hopping.
2Measurement precision
If phase coherency is maintained across frequency hops, then localization accuracy is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by using its own transmitted signal as a reference. The known training sequence allows the receiver to self-determine phase errors and automatically compensate for them without requiring external calibration equipment or complex manual adjustments, thereby improving localization accuracy while limiting complexity growth.
Solution Approach 2:
The system uses a known copy of the training sequence as a reference template. By comparing the received signal against this known copy, the system can extract phase error information and apply corrections. This copying approach simplifies the measurement process while maintaining high localization precision.
3Measurement precision
If bandwidth is extended through multiple sub-bands, then localization precision is improved, but phase error compensation becomes more difficult
Solution Approach 1:
The broadband signal is segmented into multiple narrower sub-bands, each experiencing less phase error during frequency hopping. By processing each sub-band separately and then combining results with phase compensation, the system achieves high localization precision across the full bandwidth while managing the complexity of phase error compensation through division of labor.
Data Source
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AI summary
The invention concerns a method for receiving and a receiver configured to receive a radio signal (100) carrying information, the radio signal (100) comprising an overall frequency band (foverall) having a first frequency sub band (101) and a second frequency sub band (102). According to the invention, the receiver is further configured to receive during a first time period (T1) a first portion (111) of the information carried by the radio signal in the first frequency sub band (101), and to receive during a second time period (T2) a second portion (112) of the information carried by the radio signal in the second frequency sub band (102). The receiver is further configured to perform a channel estimation (121) of the first frequency sub band (101) in orderto determine a first phase (131) and to perform a channel estimation (122) of the second frequency sub band (102) in order to determine a second phase (132). According to the invention, the receiver is further configured to determine an overall phase basis (133) of the radio signal using the first and second phases (131, 132).