Wireless Transmitting Device Antenna Delay Diversity
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Solution Overview
Problem
Conventional wireless transmission methods require adjusting spread coefficients and coding coefficients in error correcting coding to achieve frequency diversity effects, which can be challenging, especially when propagation paths have varying delay times and frequency variations.
Innovation Solution
A wireless transmission device that delays transmission signals by a specific time (n-1)T for each antenna, allowing for appropriate setting of delay times based on whether frequency diversity or multiuser diversity transmission is required, thereby producing frequency and multiuser diversity effects without adjusting spread or coding coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spread coefficients and coding coefficients are adjusted to achieve frequency diversity effects, then reception quality improves, but system complexity and control difficulty increase
Solution Approach 1:
The patent changes the parameter from coefficient adjustment to delay time adjustment. By controlling the delay time T between antenna elements, the system achieves frequency diversity effects through a single parameter (delay time) rather than multiple parameters (spread coefficients and coding coefficients), thereby simplifying control while maintaining reception quality.
2Reliability
If delay time is increased to produce frequency diversity effects, then reception power improves, but transmission timing synchronization becomes more difficult
Solution Approach 1:
The patent implements dynamic delay time adjustment where the delay time T is adaptively controlled based on the specific transmission scenario (frequency diversity vs. multiuser diversity). This allows the system to optimize reception power by setting appropriate delay times while managing timing synchronization requirements dynamically rather than using fixed delays.
Data Source
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Figure 2A~2B
Figure 3A~3C
AI summary
A wireless transmission device of the present invention includes n (where n is an integer of two or more) transmission antennas and a delay imparting section for delaying transmission signals supplied to the n transmission antennas by a maximum delay time (n-1)T or less based on a delay time T dependent upon a communication signal, which indicates whether to transmit the transmission signals by way of frequency diversity or multiuser diversity.