Antenna Diversity Control Circuit Sub-Symbol Correlation
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Solution Overview
Problem
In radio systems with antenna diversity, selecting the optimal antenna at runtime without prior knowledge leads to signal impairments, computation complexity, and poor system performance due to limited preamble detection time, resulting in false detects and reduced receive sensitivity.
Innovation Solution
An apparatus with an antenna switch, RF circuit, and antenna diversity control circuit that processes sub-symbol portions of RF signals from multiple antennas to dynamically select the best antenna based on correlation results and signal strength, allowing for efficient and fast antenna switching during packet communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If periodic antenna switching is performed to detect preambles on multiple antennas, then antenna diversity selection capability is improved, but the selection period is limited and receive sensitivity deteriorates
Solution Approach 1:
The system performs preliminary correlation of sub-symbol portions from multiple antennas during the preamble period before final antenna selection. This preliminary processing allows the system to pre-evaluate multiple antennas and prepare selection decisions, enabling faster switching and reducing the impact on the selection period and receive sensitivity.
Solution Approach 2:
The patent segments the symbol into sub-symbol portions and processes them separately from multiple antennas. By dividing the processing into sub-symbol segments, the system can efficiently correlate and evaluate multiple antennas without requiring the full symbol period, thus improving antenna diversity capability while minimizing impact on receive sensitivity.
2Measurement precision
If the selection period is extended to improve antenna selection accuracy, then measurement precision is improved, but packets may be missed if they appear during switching periods
Solution Approach 1:
The system performs preliminary correlation processing on sub-symbol portions from multiple antennas during the preamble period. This preliminary action allows accurate antenna evaluation to be completed before the data portion arrives, ensuring that antenna selection is made in advance without extending the critical packet reception window.
Solution Approach 2:
The patent enables rapid antenna selection by processing only sub-symbol portions rather than full symbols. This rushing through the essential correlation operation on reduced data allows accurate selection to be made quickly, preventing packet loss during switching periods.
3Productivity
If faster antenna switching is performed to reduce packet loss, then productivity is improved, but false detects increase due to reduced detection time
Solution Approach 1:
The patent segments the detection process to operate on sub-symbol portions rather than full symbols. This segmentation enables faster processing and switching while maintaining detection accuracy by focusing correlation operations on the essential preamble sub-symbol portions, reducing false detects even at higher switching speeds.
4Reliability
If manual antenna selection is performed to achieve optimal performance, then system performance is improved, but device complexity increases
Solution Approach 1:
The system performs self-service antenna selection by automatically correlating sub-symbol portions from multiple antennas and making selection decisions based on correlation results. This self-service mechanism achieves optimal performance comparable to manual selection without requiring external intervention, maintaining high system performance while avoiding the complexity of manual configuration systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances antenna selection precision, minimizes transient impacts, and improves system performance by enabling correct decisions in antenna diversity algorithms, leading to better receive sensitivity and reduced packet loss.
Implementation Method 1
at least one mixer to downconvert the first and second RF signals to first and second baseband signals
Implementation Method 2
a correlator to correlate the sub-symbol portions of the first plurality of symbols with a preamble value to output a first correlator result and correlate the sub-symbol portions of the second plurality of symbols with the preamble value to output a second correlator result
Data Source
AI summary
In one embodiment, an apparatus includes: an antenna switch to receive a first radio frequency (RF) signal from a first antenna and a second RF signal from a second antenna and controllable to output a selected one of the first and second RF signals; an RF circuit to receive and process the first and second RF signals; at least one mixer to downconvert the first and second RF signals to first and second baseband signals; and an antenna diversity control circuit to receive sub-symbol portions of a first plurality of symbols of the first baseband signal and sub-symbol portions of a second plurality of symbols of the second baseband signal, and control the antenna switch to output one of the first and second RF signals, based at least in part on one or more of the sub-symbol portions of the first and second pluralities of symbols.