Pseudo Propagation Path Characteristics for Multiplexing
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Solution Overview
Problem
The spectral efficiency of resource blocks in OFDMA systems, which is crucial for fourth-generation mobile communication, cannot be improved due to limitations in multiplexing and propagation path characteristics, leading to reduced communication capacity and quality.
Innovation Solution
A transmission/reception method and system that generates pseudo propagation path characteristics with low mutual correlation, allowing for the transmission of multiple independent data streams over a single wireless propagation path, enabling efficient multiplexing and improved spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple data streams are transmitted over a single wireless propagation path, then spectral efficiency and transmission rate are improved, but interference between data streams increases and mutual correlation affects signal separation
Solution Approach 1:
The patent uses pseudo propagation path characteristics as an intermediary to enable separation of multiple data streams. By generating artificial propagation path characteristics with low mutual correlation and using them as reference signals, the receiver can distinguish and separate simultaneously transmitted data streams without direct interference, thus improving transmission rate while controlling interference.
Solution Approach 2:
The patent changes the parameter of propagation path characteristics by generating multiple sets with different correlation properties. By adjusting the mutual correlation parameter of pseudo propagation paths and selecting combinations with low correlation, the system optimizes the balance between transmission capacity and signal separability, resolving the contradiction between high transmission rate and low interference.
2Reliability
If OFDMA resource blocks are used for communication, then frequency selective multipath fading is mitigated, but spectral efficiency cannot be improved due to multiplexing limitations
Solution Approach 1:
The patent transitions from traditional single-dimension OFDMA multiplexing to multi-dimensional multiplexing by introducing pseudo propagation path characteristics as an additional dimension. This allows multiple data streams to be multiplexed not only in frequency and time domains but also in the propagation path characteristic domain, thereby improving spectral efficiency while maintaining the reliability benefits of OFDMA against frequency selective fading.
Data Source
AI summary
The present invention is a transmission/reception method in which a reception device measures propagation path characteristics of a communication propagation path, a transmission device generates, based on a measurement result of the propagation path characteristics, a plurality of pseudo propagation path characteristics having propagation path characteristics similar to the propagation path characteristics so as to have low mutual correlation, the transmission device generates a data group including a plurality of parallel and independent data in the same number as the plurality of pseudo propagation path characteristics in a baseband on a transmitting side, obtains a transmission signal by synthesizing a plurality of superimposed data generated by superimposing the pseudo propagation path characteristics on the data one by one, and transmits a plurality of pseudo propagation path characteristic information relating to the plurality of pseudo propagation path characteristics and the transmission signal, and the reception device receives the plurality of pseudo propagation path characteristic information transmitted antecedently from the transmission device and a communication signal transmitted subsequently, and individually extracts the plurality of data from the communication signal based on the plurality of pseudo propagation path characteristic information.