OFDMA Wireless Communication Directivity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio communication systems face challenges in improving data transmission efficiency when multiple radio communication devices are present, particularly in extending communication distances and managing data transmission rates effectively.
Innovation Solution
The implementation of a radio communication method using orthogonal frequency division multiple access (OFDMA) scheme, where multiple reference signals are transmitted and received with directivity control, allowing for improved data transmission rates by optimizing beamforming and directivity control between radio communication apparatuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmission beamforming and reception beamforming are determined through sector sweep signals, then communication distance is extended, but data transmission efficiency of the entire communication system deteriorates
Solution Approach 1:
The patent applies preliminary action by having the first radio communication device determine transmission beamforming and reception beamforming methods in advance during a beam training phase before actual data transmission begins. This allows the second device to efficiently transmit reference signals with predetermined directivity control, extending communication distance while maintaining data transmission efficiency through pre-configured beamforming parameters.
2Adaptability or versatility
If multiple radio communication devices are present in the system, then communication coverage is improved, but managing data transmission rates effectively becomes more difficult
Solution Approach 1:
The patent implements feedback by having the second radio communication device transmit reference signals that include feedback information on the directivity corresponding to the first reference signals received from the first device. This feedback mechanism enables the first device to adjust its transmission parameters based on the second device's received signal quality, effectively managing data transmission rates in multi-device environments while expanding communication coverage.
Data Source
AI summary
This wireless communication system comprises: a first wireless communication device that transmits a plurality of first reference signals having controlled directivity by the orthogonal frequency division multiple access (OFDMA) method in a first period; and a second wireless communication device that transmits a plurality of second reference signals having controlled directivity to the first wireless communication device in a second period, the second reference signals including information relating to directivity and corresponding any one or more of the first reference signals received from the first wireless communication device.