Zero DC Component Reference Signal for EDMG Channel Estimation
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Solution Overview
Problem
Current channel estimation methods in IEEE 802.11ad wireless local area networks face challenges in distinguishing between OFDM and SC modes, leading to inefficiencies in channel estimation and beam refinement protocols, particularly due to the presence of a DC component in reference signals.
Innovation Solution
A reference signal configuration method is introduced, where a first part and a second part of equal length are generated, with a sum of their DC components being zero, facilitating DC offset estimation and enabling accurate CFO and channel estimation. This method is integrated into enhanced directional multi-gigabit (EDMG) packets, allowing for flexible configuration of training fields and antenna weight vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the reference signal includes a non-zero DC component, then the reference signal can be generated using conventional methods, but DC offset estimation and correction become necessary, complicating the channel estimation process
Solution Approach 1:
The patent applies preliminary action by designing the reference signal with a zero DC component from the outset, rather than correcting DC offset after generation. The reference signal is constructed by setting the DC subcarrier to zero and using complementary sequences that inherently cancel DC components, eliminating the need for subsequent DC offset estimation and correction steps in the channel estimation process
Solution Approach 2:
The patent converts the potential harm of DC offset by deliberately designing the reference signal to have zero DC component. This design choice transforms what would be a harmful distortion into a beneficial feature that simplifies the overall system by removing the need for DC offset correction mechanisms
2Reliability
If the reference signal has a non-zero DC component, then signal transmission is maintained, but channel estimation accuracy is degraded due to DC offset interference
Solution Approach 1:
The patent eliminates DC offset interference in advance by designing the reference signal with zero DC component through complementary sequences and zeroing the DC subcarrier, ensuring that channel estimation is performed on a signal free from DC distortion without requiring post-processing correction
3Device complexity
If the reference signal includes DC component, then the signal structure is simpler, but additional processing steps are required for DC offset estimation and correction
Solution Approach 1:
The patent extracts and removes the DC component from the reference signal by setting the DC subcarrier to zero and using complementary sequences that cancel DC components. This extraction eliminates the source of DC offset interference, allowing channel estimation to proceed without additional DC correction processing steps
Data Source
AI summary
The present application discloses a reference signal configuration method, including: generating a reference signal, where the reference signal includes a first part and a second part, the first part and the second part have a same length, and a sum of a DC component of the first part and a DC component of the second part is zero; generating an enhanced directional multi-gigabit EDMG packet including the reference signal; and sending the EDMG packet. Embodiments of the present application further provide a reference signal configuration apparatus. According to the embodiments of the present application, a reference signal with a zero DC component can be obtained, thereby facilitating channel estimation that is based on CE.