Adaptive Pilot Pattern Assignment in Multiple Antenna Systems
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Solution Overview
Problem
In multiple antenna systems, existing methods waste radio resources due to the unnecessary use of pilots, as they do not adaptively assign pilots according to the rank of users within a permutation zone, leading to inefficient data transmission.
Innovation Solution
The method involves transmitting data using multiple pilot patterns within a single permutation zone, where the pilot pattern is assigned based on the rank of the user, and upon retransmission requests, adjusting the pilot pattern to a lower rank to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed pilot pattern is used for all users in a permutation zone, then the system is simple to implement, but radio resources are wasted due to unnecessary pilot usage by low-rank users
Solution Approach 1:
The patent applies dynamics by making the pilot pattern adaptive rather than fixed. The pilot pattern is dynamically selected based on the user's rank, allowing the system to adjust pilot usage according to actual channel conditions and user requirements, thereby eliminating unnecessary pilot transmissions for low-rank users while maintaining proper pilot assignment for high-rank users
Solution Approach 2:
The patent implements local quality by applying different pilot patterns to different users within the same permutation zone based on their specific rank requirements. Instead of using a uniform pilot pattern for all users, the system tailors the pilot pattern to each user's local needs, ensuring optimal resource utilization for each user's specific transmission requirements
2Productivity
If multiple pilot patterns are assigned to different users based on rank, then radio resource efficiency improves, but the complexity of pilot pattern management increases
Solution Approach 1:
The patent applies parameter changes by varying the pilot pattern parameters according to the user's rank. The system changes the pilot pattern configuration based on the rank parameter, allowing high-rank users to utilize more pilots for better channel estimation while low-rank users use fewer pilots, thereby optimizing resource efficiency without requiring complex manual management
3Measurement precision
If pilots are increased for high-rank users, then channel estimation accuracy improves, but overall system resource consumption increases
Solution Approach 1:
The patent applies local quality by providing differentiated pilot patterns to different users based on their rank requirements. High-rank users receive pilot patterns with more pilots for accurate channel estimation, while low-rank users receive pilot patterns with fewer pilots. This localized optimization ensures that system resources are consumed only where necessary for maintaining measurement precision
Data Source
AI summary
A method of transmitting data in a multiple antenna system includes transmitting first data through a first pilot pattern zone in which pilots are arranged in a specific pilot pattern in a permutation zone having at least one tile comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols and a plurality of subcarriers, and transmitting second data through a second pilot pattern zone in which pilots are arranged in another pilot pattern different from the pilot pattern of the first pilot pattern zone in the permutation zone. Accordingly, a plurality of pilot patterns can be simultaneously used in one permutation zone, and thus waste of radio resources caused by the use of unnecessary pilots can be reduced by adaptively assigning pilots according to various channel environments and performances of user equipments.