Wireless Frame Preamble Layout for Low-Complexity Synchronization
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Solution Overview
Problem
Conventional wireless communication preambles in IEEE environments face challenges in enhancing automatic gain control, signal detection, and time and frequency synchronization performances, leading to increased complexity and peak-to-average-power ratio (PAPR), and constraints on synchronization estimation performance.
Innovation Solution
A method and apparatus for generating a frame that includes a modified sequence using a first base sequence for synchronization estimation, assigning it and its complex conjugate or sign-different sequence to the frequency domain, and optionally adding a TD sequence for automatic gain control, to enhance synchronization and data communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional IEEE preamble structure with two OFDM symbols and repetition pattern sequences is used, then time and frequency synchronization can be achieved, but automatic gain control performance and signal detection performance are insufficient
Solution Approach 1:
The preamble is divided into multiple independent sequences (first sequence, second sequence, third sequence) with different functions. The first sequence is optimized for synchronization estimation, while the second and third sequences are designed to enhance automatic gain control and signal detection, allowing each segment to specialize in its specific function without compromising overall performance
Solution Approach 2:
The patent combines multiple sequence types with different properties into a composite preamble structure. By integrating sequences with different characteristics (synchronization-optimized, AGC-optimized, detection-optimized), the preamble achieves multiple functions simultaneously, similar to how composite materials combine different materials to achieve multiple properties
2Reliability
If conventional preamble structures are used, then signal detection can be performed, but reception complexity increases
Solution Approach 1:
The patent extracts the automatic gain control function into a separate dedicated sequence (second sequence) distinct from the synchronization sequence. This separation allows the receiver to process synchronization and AGC independently, reducing the complexity of joint processing while maintaining both functions' effectiveness
3Productivity
If conventional data frame structures are used, then data communication can occur, but data communication efficiency is limited
Solution Approach 1:
The patent merges synchronization sequences and data sequences into a unified frame structure where the same time-frequency resources serve dual purposes. The first time interval contains both synchronization estimation sequences and data transmission, eliminating the need for separate synchronization and data periods, thus improving overall communication efficiency
Data Source
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AI summary
Disclosed is a technique related to a method and apparatus for generating a preamble and a data frame for wireless communication, and to a synchronization estimation method using the preamble. According to the technique, a method for generating a frame for wireless communication is disclosed, wherein the method comprises: a step of generating a modified sequence using a first base sequence for synchronization estimation; and a step of allocating the first base sequence and the modified sequence to the frequency domain of a first timeslot to generate a preamble. The modified sequence includes a complex conjugated sequence of the first base sequence or a sequence having a code different from that of the first base sequence.