PPDU Golay Sequences for Low-Interference Channel Estimation
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Solution Overview
Problem
Existing communication technologies using high-frequency signals, such as 60 GHz, face challenges in improving sequence sending efficiency for channel estimation and target sensing, leading to interference and reduced pulse sensing time.
Innovation Solution
The implementation of Golay complementary sequences in PPDU to reduce cross-correlation energy between sequences, allowing for multiple sequences to be sent within one period, enhancing channel estimation and target sensing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sequences are sent within one period to improve channel estimation efficiency, then sequence sending efficiency is improved, but cross-correlation interference between sequences increases
Solution Approach 1:
The patent applies parameter changes by modifying the sequence design parameters to achieve zero cross-correlation. Specifically, it uses Golay complementary sequences with specific autocorrelation and cross-correlation properties, where the cross-correlation energy between different sequences is zero within the Golay complementary sequence length range. This parameter optimization allows multiple sequences to be transmitted simultaneously without interference, resolving the contradiction between sending efficiency and interference.
2Loss of time
If more sequences are transmitted per period to reduce pulse sensing time, then pulse sensing time is reduced, but sequence complexity and processing difficulty increase
Solution Approach 1:
The patent applies segmentation by dividing the transmission into multiple space-time streams, each carrying a separate sequence. The first field of the PPDU is segmented to carry M sequences corresponding to M space-time streams, with one sequence per stream. This segmentation allows parallel transmission of multiple sequences without increasing processing complexity, as each sequence can be independently processed at the receiver.
Solution Approach 2:
The patent changes the sequence parameters to Golay complementary sequences, which have optimal autocorrelation and cross-correlation properties. These sequences maintain low complexity while enabling multiple sequences to be transmitted per period, thus reducing pulse sensing time without significantly increasing processing difficulty.
3Measurement precision
If high-frequency signals are used to improve distance resolution and bandwidth, then transmission bandwidth and distance resolution are improved, but sensitivity to moving targets and interference increase
Solution Approach 1:
The patent applies parameter changes by using Golay complementary sequences with zero cross-correlation energy within the Golay complementary sequence length range. This parameter optimization eliminates interference between multiple sequences transmitted simultaneously, allowing high-frequency signals to maintain their advantages in bandwidth and distance resolution while reducing interference through proper sequence design.
Data Source
AI summary
This application discloses a signal processing method and an apparatus. The method includes: A transmit device generates a PPDU, and sends the PPDU; and a receive device receives the PPDU, and processes M sequences carried in the PPDU. The PPDU shown in this application includes a first field, the first field is used for carrying M sequences, the M sequences correspond to M space-time streams, one sequence corresponds to one space-time stream, and M is a positive integer. According to the method provided in this application, sequence sending efficiency can be effectively improved.