Single-Frequency Sequence for 60 GHz Signal Capturing
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Solution Overview
Problem
Existing 60 GHz millimeter wave communication standards fail to effectively capture physical layer signals due to non-ideal radio frequency components, such as nonlinear impacts and IQ imbalance, leading to deteriorated detection performance under channel multipath and large frequency offsets.
Innovation Solution
A method and system that construct a signal frame with a single-frequency sequence, enabling frequency domain capturing and including preset symbols for frequency offset and IQ imbalance estimation and compensation, which improves robustness and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Golay sequences (Ga128) are used for frame capturing in existing 60 GHz standards, then the capturing method can be implemented, but the detection performance significantly deteriorates under channel multipath and large frequency offsets
Solution Approach 1:
The patent changes the sequence design parameters by using a specific phase rotation pattern (e^(-jπ/4)) on Golay sequences to create a new sequence structure that maintains correlation properties while being robust to frequency offset and multipath effects
Solution Approach 2:
The patent combines multiple Golay sequences (Ga128 and Gb128) with specific phase rotations to form a composite sequence structure that leverages the complementary properties of both sequences to resist multipath and frequency offset effects
2Reliability
If differential coherence method is used for frame capturing, then capturing can be performed under large carrier frequency offset, but the capturing performance is affected due to rotation phases being different under large frequency offset
Solution Approach 1:
The patent employs a feedback mechanism where the receiver estimates frequency offset based on the known sequence structure, then uses this estimation to compensate for phase rotations in subsequent processing, iteratively improving capturing accuracy
3Reliability
If blind estimation-based solutions are used for nonlinear impact and IQ imbalance, then some compensation can be achieved, but the receiver becomes too complex and lacks feasibility for 60 GHz system
Solution Approach 1:
The patent performs IQ imbalance and nonlinear compensation in advance during the training phase using the known sequence structure, so that the main data reception can proceed with simpler processing, reducing overall receiver complexity while maintaining compensation capability
4Reliability
If multiple correlation method is used to resist carrier phase offset, then phase offset resistance is achieved, but correlation value is greatly affected under large frequency offset
Solution Approach 1:
The patent modifies the correlation method by incorporating frequency offset compensation parameters into the correlation process, adjusting the correlation calculation to account for expected frequency offsets and maintain accuracy under large frequency conditions
Data Source
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AI summary
Embodiments of the present invention disclose a method, an apparatus and a system for sending a physical layer signal, where the method for sending a physical layer signal includes: constructing a signal frame of a physical layer signal, where the signal frame includes a single-frequency sequence, the single-frequency sequence is used to enable a receiving apparatus to capture the signal frame in a frequency domain according to the single-frequency sequence, and the single-frequency sequence includes a plurality of single-frequency preset symbols; and sending the physical layer signal based on the signal frame. Applying the present invention can facilitate capturing the signal frame in a frequency domain by a receive end, and therefore, not only impact caused by frequency offset is overcome, but also multipath energy may be used effectively to improve performance of capturing.