Transmit Diversity Signal Delay Management
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Solution Overview
Problem
In wireless communication networks, duplicate signals can interfere with each other, leading to performance issues due to the lack of effective methods for managing signal delays.
Innovation Solution
The method involves determining a first transmit signal based on modulation symbols and creating a delayed copy of this signal, which is transmitted from a second antenna, with the delay being less than a maximum value, to reduce interference and improve system performance through transparent transmit diversity techniques like cyclic delay diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplicate signals are transmitted without delay management, then signal transmission can proceed, but interference occurs between duplicate signals leading to performance degradation
Solution Approach 1:
The patent applies preliminary action by introducing a delay to the second transmit signal before transmission. This delay is applied in advance to prevent the duplicate signals from interfering with each other when they arrive at the receiver, thus resolving the interference problem while maintaining transmission reliability
2Reliability
If transmit diversity is implemented to improve link performance, then more power can be transmitted, but the complexity of signal management increases
Solution Approach 1:
The patent applies parameter changes by modifying the time delay parameter of the second transmit signal. By adjusting this delay parameter, the system achieves transmit diversity and improved link performance while keeping the implementation relatively simple, as it primarily involves timing adjustment rather than complex signal processing
3Reliability
If delayed copy signals are transmitted to reduce interference, then signal quality improves, but transmission time increases
Solution Approach 1:
The patent applies partial action by introducing only a partial delay to the second transmit signal, rather than a complete or excessive delay. This partial delay is sufficient to reduce interference between duplicate signals while minimizing the impact on overall transmission time, thus achieving a balance between signal quality and transmission efficiency
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for transmitting signals with delays. One method includes determining, at a user equipment, a first transmit signal based on a set of modulation symbols. The method includes determining a second transmit signal based on the first transmit signal, wherein the second transmit signal is a delayed copy of the first transmit signal that is delayed by a delay, and the delay is less than a maximum value. The method includes transmitting the first transmit signal from a first antenna of the user equipment. The method includes transmitting the second transmit signal from a second antenna of the user equipment.