Wireless Receiver Interleaver Synchronization Without Preamble
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Solution Overview
Problem
Conventional wireless receiving apparatuses face difficulties in demodulating data signals when reception starts without a preamble signal, as they struggle to determine the initial position and size of interleaver blocks, leading to inadequate demodulation processes.
Innovation Solution
A wireless receiving apparatus and method that includes a correlation value calculation module and an interleaver information determination module, which calculate correlation values between received signals and reference signals to determine the initial position and size of interleaver blocks, even in the absence of a preamble signal, by using Walsh-Hadamard sequences and threshold values based on data rate modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reception starts without a preamble signal, then the receiving apparatus can begin processing data, but the initial position and size of interleaver blocks cannot be determined, leading to inadequate demodulation
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correlation values between known signals and received signals at various possible positions. These pre-computed correlation values are stored in a lookup table, allowing the receiving apparatus to quickly determine interleaver block positions without requiring a preamble signal, thus resolving the contradiction between fast reception processing and accurate position determination
Solution Approach 2:
The patent replaces the conventional mechanical approach of sequential signal processing with a computational substitution using correlation calculations. By substituting the traditional preamble-based synchronization mechanism with correlation value computation and comparison, the system can determine interleaver block positions accurately without requiring preamble signals, enabling both fast processing and precise measurement
2Device complexity
If conventional demodulation methods are used without preamble signals, then processing can be simplified, but demodulation accuracy deteriorates due to inability to determine interleaver parameters
Solution Approach 1:
The patent applies self-service by enabling the receiving apparatus to determine its own synchronization parameters (interleaver block initial position and size) autonomously through correlation calculations. The system uses embedded known signals and pre-stored correlation values to self-determine timing and parameters without external assistance or preamble signals, maintaining both simplicity and reliability
Solution Approach 2:
The patent uses preliminary action by pre-computing and storing correlation values for all possible known signal positions and interleaver configurations. This pre-prepared reference data allows the receiving apparatus to quickly and reliably determine demodulation parameters without complex real-time calculations, maintaining low device complexity while ensuring high demodulation reliability
Data Source
AI summary
According to one embodiment, a wireless receiving apparatus includes a calculation module, a first determination module and a second determination module. The second determination module determines a length of interleaver blocks by determining whether or not a maximum value of second correlation value sequence is not less than a second threshold value within a first period, the second correlation value sequence being generated by combining third correlation values being between the receiving signal and each of reference signals, and to determine an initial position of the interleaver blocks based on a position of the maximum value.