Multi-Channel Preamble Reception Using Correlation-Based Channel Staying
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Solution Overview
Problem
Existing wireless communication devices supporting multiple IEEE 802.15.4-based protocols face challenges in simultaneously joining networks operating on different channels due to hardware limitations and channel switching times exceeding 16 μs, leading to connection errors and increased hardware costs.
Innovation Solution
A wireless communication device employs time-division multiplexing to alternately switch between channels for preamble detection, using an MAC circuit to control channel switching and a baseband circuit to calculate correlations, allowing for efficient PHY layer packet reception without significant hardware increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RF circuit switches channels to monitor packets in multiple networks, then the device can join multiple networks on different channels, but the channel switching time exceeds 16 μs causing preamble detection failures
Solution Approach 1:
The device performs preliminary actions by staying on the current channel for one additional symbol period after detecting a preamble to receive and correlate another preamble symbol, confirming packet continuity before switching channels. This preliminary confirmation prevents premature channel switching that would cause preamble detection failures.
Solution Approach 2:
The invention dynamically adjusts channel monitoring behavior based on real-time correlation results. When correlation exceeds the threshold, the device continues monitoring on the current channel; otherwise, it switches channels. This dynamic adaptation resolves the contradiction between joining multiple networks and maintaining reliable detection.
2Reliability
If the device stays on one channel for extended periods to complete packet reception, then packet reception reliability improves, but the ability to monitor multiple channels decreases
Solution Approach 1:
The invention uses feedback from correlation calculations to determine whether to stay on the current channel or switch to another channel. The correlation result serves as feedback indicating packet continuity, enabling the device to make informed decisions about channel monitoring duration and multi-channel switching timing.
Solution Approach 2:
By performing preliminary correlation checks on additional preamble symbols before committing to extended channel staying, the device ensures reliable packet reception while maintaining the flexibility to switch channels when appropriate. This preliminary verification enables balanced multi-channel monitoring.
3Adaptability or versatility
If the RF circuit switches channels more frequently to monitor multiple networks, then multi-network support improves, but hardware costs increase
Solution Approach 1:
The device implements periodic channel monitoring by alternating between staying on the current channel and switching to other channels based on packet detection needs. This periodic action pattern enables single hardware to support multiple protocols effectively, avoiding the need for multiple simultaneous RF circuits.
Solution Approach 2:
The invention makes a single RF circuit universal by enabling it to handle multiple IEEE 802.15.4-based protocols through intelligent channel switching and correlation-based packet detection. This multi-functionality approach avoids increasing hardware complexity while maintaining broad protocol support.
Data Source
AI summary
A wireless communication device includes an MAC circuit, an RF circuit, and a baseband circuit. The MAC circuit is configured to simultaneously join or create networks that work on a first channel and a second channel, respectively. The RF circuit is configured to switch to the first channel according to a control of the MAC circuit. The baseband circuit is configured to stay on the first channel for a first symbol period to perform a preamble detection. If a preamble of a PHY layer packet is detected during the first symbol period, the baseband circuit further stays on the first channel for a second symbol period to continue receiving the preamble, and calculates the correlation between the data received respectively during the first symbol period and the second symbol period, and determines whether to stay on the first channel to continue receiving the PHY layer packet accordingly.