Wire Harness Antenna Diversity for Compact Wireless Terminals
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Solution Overview
Problem
Existing wireless communication systems inside vehicles face challenges in maintaining consistent reception strength and improving communication quality due to the limitations of wideband communication methods, which often result in large-sized wireless terminals when using diversity techniques like space, polarization, or directional diversity.
Innovation Solution
A wire harness with strategically placed antennas, including a first antenna in the wireless terminal and additional antennas along the electric wires, with intervals equal to or longer than 0.3λ, enabling diversity MIMO/SDMA systems without increasing the wireless terminal's size, by adopting narrowband wireless communication and utilizing space, polarization, or directional diversity schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If space diversity scheme is adopted with multiple antennas, then reception strength variation is restrained and communication quality is improved, but wireless terminal size increases
Solution Approach 1:
The patent divides the antenna system into two separate locations: antennas in the wireless terminal and antennas in the base station. This segmentation allows the wireless terminal to use a single antenna while the base station employs multiple antennas, achieving diversity effects without increasing terminal size.
Solution Approach 2:
The patent extends the antenna array from the terminal side to the base station side, utilizing the spatial dimension at the base station to achieve diversity. By placing multiple antennas at the base station with appropriate spacing, the system achieves space diversity without requiring multiple antennas in the compact terminal.
2Reliability
If polarization diversity scheme is adopted with multiple antennas, then reception strength variation is restrained and communication quality is improved, but wireless terminal size increases
Solution Approach 1:
The patent segments the polarization diversity function between the terminal and base station. The terminal uses a single antenna, while the base station employs multiple antennas with different polarization orientations, achieving polarization diversity without increasing terminal complexity or size.
Solution Approach 2:
The base station antenna system is designed to perform multiple functions: it provides both the primary reception function and the polarization diversity function simultaneously. By making the base station antenna system multi-functional, the patent eliminates the need for the terminal to carry multiple specialized antennas.
3Reliability
If directional diversity scheme with adaptive array antennas is adopted, then reception strength variation is restrained and communication quality is improved, but wireless terminal size increases
Solution Approach 1:
The patent divides the directional diversity and adaptive array processing functions from the terminal to the base station. The terminal simply transmits and receives signals, while the base station performs beamforming and adaptive array processing using multiple antennas, achieving directional diversity without increasing terminal size.
Solution Approach 2:
The base station acts as an intermediary that performs complex signal processing functions. By placing the adaptive array processing capability at the base station rather than the terminal, the system achieves directional diversity effects while keeping the terminal compact and simple.
Data Source
AI summary
A wire harness includes plural electric wires provided with a connecting unit at an end portion of the plural electric wires, a first antenna connected to the connecting unit and installed in a wireless terminal, and a second antenna connected to at least one of the plural electric wires. An interval between the first antenna and the second antenna is equal to or longer than 0.3.lamda..