Antenna Selection Using Predicted Packet Error Rate
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Solution Overview
Problem
Conventional antenna selection methods in wireless communication are inefficient due to high time and power consumption, and are unable to quickly adapt to changes in signal quality, especially in orthogonal frequency division multiplexing (OFDM) architectures and wireless fading channels.
Innovation Solution
A method and system for link quality metric-based antenna selection that uses a predicted packet error rate (PER) and packet error history to switch between multiple antennas, leveraging a control signal to trigger antenna changes and compute effective mutual information and signal-to-noise ratio for optimal antenna selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal strength of preamble is used to select antenna, then receive reliability is improved, but time consumption and power dissipation increase significantly
Solution Approach 1:
The system performs preliminary actions by measuring signal strength of preamble symbols before the actual data packet reception. This allows the receiver to determine the best antenna in advance and switch to it before data transmission begins, avoiding the need to sequentially test all antennas during data reception and significantly reducing time consumption while maintaining reliability
Solution Approach 2:
The antenna selection process is segmented into two independent phases: preamble phase (for measuring signal strength) and data packet phase (for actual reception). By separating these phases, the system can efficiently select the best antenna using preamble measurements without having to sequentially evaluate all antennas during the more time-critical data reception period
2Reliability
If sequential switching through multiple antennas is performed to determine packet reliability, then receive reliability is improved, but hardware constraints in OFDM architectures prevent this approach
Solution Approach 1:
The system performs preliminary antenna measurement using preamble symbols before data reception begins. This allows the receiver to identify the best antenna in advance and switch to it before the time-critical data packet arrives, eliminating the need for sequential switching during data reception and working around OFDM hardware constraints
Solution Approach 2:
The system dynamically switches to the best antenna based on preamble measurements before data reception starts. This dynamic selection allows the receiver to adapt to different antenna conditions without requiring complex sequential switching hardware, as the decision is made in advance when the receiver is in a more flexible state
3Measurement precision
If long-term packet error rate evaluation is used to select antenna, then measurement precision is improved, but reaction speed to rapidly occurring changes becomes too slow
Solution Approach 1:
The system performs preliminary antenna evaluation using preamble symbols before data reception. This preliminary action provides immediate feedback on antenna quality without requiring long-term averaging, allowing the system to quickly react to changing channel conditions while maintaining measurement precision through the use of multiple preamble symbols for statistical evaluation
Data Source
AI summary
A method and system for link quality metric based antenna selection for transceiver are disclosed. In one embodiment, a method for selecting an antenna from multiple antennas associated with a receiver, includes receiving multi-carrier modulated signals via a currently active antenna of the receiver, and estimating a predicted packet error rate (PER) associated with a current receive path of the receiver. The current receive path is used to process the multi-carrier modulated signals. The method further includes selecting a next antenna from the multiple antennas for forming a next receive path of the receiver based on the predicted PER and a packet error history associated with at least one previous receive path.