Wireless Frame Synchronization With Dual Differential Correlators
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Solution Overview
Problem
Wireless communication devices face challenges in correctly detecting preamble training sequences for synchronization due to low transmit power levels, leading to increased power consumption and communication delays from excessive retransmissions, especially in battery-powered devices with weak carrier-to-noise ratios.
Innovation Solution
Implementing a dual correlator structure with two differential demodulators and correlators to enhance the detection of wireless symbol sequences by performing correlation calculations on both single and twice differentially demodulated symbol sequences, improving signal detection in noisy environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low transmit power levels are used, then power consumption is reduced, but detection accuracy of preamble training sequences deteriorates
Solution Approach 1:
The patent combines multiple correlation operations (first correlator operating on directly received symbols and second correlator operating on conjugated symbols) to detect the training sequence. This merging of detection paths enhances detection accuracy while maintaining low transmit power levels, as the combined correlation results provide more reliable detection despite the reduced signal power.
Solution Approach 2:
The system uses correlation results from both correlators to make detection decisions. The feedback mechanism compares the correlation outputs and uses this information to determine whether the training sequence has been successfully detected, thereby maintaining detection accuracy even when transmit power is reduced.
2Use of energy by moving object
If low transmit power levels are used, then power consumption is reduced, but retransmission frequency increases
Solution Approach 1:
By merging the detection capabilities of two correlators, the system achieves more reliable training sequence detection at low power levels. This reduces the probability of detection failures that would trigger retransmissions, thereby improving communication efficiency without increasing power consumption.
Solution Approach 2:
The dual correlator structure provides a cushion against detection failures before they occur. By having redundant correlation paths ready in advance, the system can withstand the challenges of low power transmission without resulting in retransmissions, thus maintaining productivity while consuming less energy.
3Measurement precision
If dual correlator structure is implemented, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The dual correlator structure uses the same basic correlation operation for both detection paths, making the additional complexity reusable and systematic rather than ad hoc. The second correlator processes conjugated symbols but uses the same correlation algorithm, allowing the system to achieve enhanced detection accuracy through a structured, multi-functional approach that minimizes redundant complexity.
Data Source
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AI summary
One example discloses a first wireless device, including: a receiver configured to receive a symbol sequence in a wireless communication frame transmitted from a second wireless device; a first demodulator configured to generate a first differential symbol sequence by differentiating the received symbol sequence; a first correlator configured to compare the first differential symbol sequence to a first differential sync word; wherein the first correlator is configured to generate a first match signal if the first differential symbol sequence substantially matches the first differential sync word; a second demodulator configured to generate a second differential symbol sequence by differentiating the first differential symbol sequence; a second correlator configured to compare the second differential symbol sequence to a second differential sync word; wherein the second correlator is configured to generate a second match signal if the second differential symbol sequence substantially matches the second differential sync word.