OFDM Reference Signal Arrangement for Throughput
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Solution Overview
Problem
In multiuser MIMO systems, the existing mechanisms lack flexibility in generating reference signals and controlling information, limiting system throughput and increasing control information, especially in multipath environments where spatial multiplexing of layers and users exceeds orthogonal limits.
Innovation Solution
A transmission device that determines whether to arrange 1 or 2 OFDM symbols containing a reference signal at specified positions in each slot, with the option to add additional OFDM symbols, using a pseudorandom number-generated reference signal, to improve system throughput and control information management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of spatially multiplexed layers and users is increased beyond the orthogonal number of reference signals, then system throughput is improved, but control information increases
Solution Approach 1:
The patent applies dynamics by making the reference signal arrangement flexible and adaptive. The system can dynamically select between arranging reference signals in 1 OFDM symbol or 2 OFDM symbols based on transmission conditions, and can additionally arrange OFDM symbols containing reference signals in the same slot when needed. This dynamic adaptability allows the system to support more spatially multiplexed layers and users beyond orthogonal limits while controlling information overhead.
Solution Approach 2:
The patent changes the parameter of reference signal arrangement by allowing variable positioning in time and frequency domains. The information processing unit determines whether to arrange reference signals in 1 or 2 OFDM symbols at specified positions in each slot, and can add additional OFDM symbols containing reference signals. This parameter flexibility enables generation of quasi-orthogonal sequences, increasing the number of multiplexing capabilities without proportionally increasing control information.
2Measurement precision
If reference signals are arranged in more OFDM symbols, then transmission path estimation accuracy is improved, but control information increases
Solution Approach 1:
The patent applies partial or excessive action by allowing the system to arrange reference signals in 1 or 2 OFDM symbols at specified positions, and optionally add additional OFDM symbols containing reference signals in the same slot. The information processing unit determines the appropriate arrangement based on conditions, providing just enough reference signals for accurate transmission path estimation without excessive control information overhead.
Data Source
AI summary
When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit (101) determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit (108) performs multiplexing of a reference signal in accordance with the determination by the information processing unit (101).