MIMO ARQ Antenna Group Prioritization by Bit Error Rate
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Solution Overview
Problem
In multiple input multiple output (MIMO) systems, existing ARQ methods face challenges in reducing retransmission data errors and times due to the complexity of managing retransmissions across multiple antennas with varying bit error rates.
Innovation Solution
An apparatus and method that prioritize antenna groups based on ascending bit error rates, sequentially retransmitting data using the antenna group with the highest priority first within a reordering threshold range to minimize retransmission errors and times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ARQ retransmission is performed in MIMO system without antenna group prioritization, then retransmission reliability is maintained, but retransmission time and data error rate increase
Solution Approach 1:
The patent changes the parameter of antenna selection by introducing prioritization based on bit error rate metrics. The transmitting end identifies multiple antenna groups capable of retransmission and prioritizes them according to their BER characteristics, selecting the highest priority antenna group for actual retransmission. This parameter-based selection optimizes the trade-off between reliability and time by choosing the most reliable antenna group available.
2Device complexity
If antenna groups are selected randomly for retransmission, then system complexity is reduced, but retransmission data error rate increases
Solution Approach 1:
The patent introduces a prioritization parameter based on bit error rate to guide antenna group selection. Instead of random selection, the system evaluates each antenna group's BER performance and assigns priorities accordingly. The transmitting end selects the highest priority antenna group for retransmission, ensuring optimal data accuracy while maintaining manageable system complexity through automated prioritization logic.
3Productivity
If all antenna groups are used for simultaneous retransmission, then retransmission speed increases, but data error rate increases due to suboptimal antenna selection
Solution Approach 1:
The patent applies local quality optimization by evaluating and prioritizing individual antenna groups based on their specific bit error rate characteristics. Instead of treating all antenna groups uniformly or using simultaneous retransmission, the system identifies the locally optimal antenna group (highest priority) for each retransmission operation. This ensures that each retransmission uses the most suitable antenna group for the current channel conditions.
Solution Approach 2:
The system changes the selection parameter from uniform/random selection to prioritized selection based on BER metrics. By introducing prioritization levels for different antenna groups, the system can select the optimal antenna group for each retransmission attempt, balancing speed and quality by avoiding unnecessary retransmissions through poor antenna selection.
Data Source
AI summary
Provided are an apparatus and method for processing an ARQ in a MIMO system. The apparatus includes a storing unit for storing reordering thresholds of each receiving terminal and retransmission data; a priority managing unit for assigning a priority to a plurality of antenna groups in ascending order of a bit error rate of a wireless channel of each antenna group and managing the plurality of antenna groups based on the priorities; a data transmitting unit for transmitting retransmission data; and a controlling unit for controlling the data transmitting unit to transmit retransmission data within a range not exceeding a reordering threshold of a corresponding receiving terminal sequentially using an antenna group having the highest priority first.