MIMO Communication Apparatus Channel Variation Adaptation
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Solution Overview
Problem
In wireless communication systems using MIMO transmission, the selection of communication methods based on temporal transmission characteristics can lead to unsuitable communication speeds and reduced throughput, especially in environments with significant multi-path phasing or when devices are moving rapidly, as existing techniques do not adequately account for variations in transmission characteristics over time.
Innovation Solution
A communication method that involves acquiring and calculating the variation of transmission characteristics across multiple channels using MIMO channel estimation, determining whether to apply space time block coding (STBC) based on these variations, and adjusting the transmission rate accordingly to ensure optimal communication speed and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If communication method is decided based on temporal transmission characteristic, then communication reliability is improved, but communication speed lowers and throughput drops
Solution Approach 1:
The patent applies dynamics by making the communication method selection adaptive rather than static. The determination unit dynamically adjusts between STBC and non-STBC communication methods based on real-time channel variation calculations. This dynamic adaptation allows the system to maintain high throughput in stable channels while ensuring reliability in rapidly changing channels, resolving the contradiction between reliability and throughput.
Solution Approach 2:
The patent changes the parameter used for decision-making from instantaneous transmission characteristic to calculated channel variation. By computing the variation of transmission characteristics over multiple time points and comparing it against a threshold, the system selects appropriate communication parameters (STBC or non-STBC). This parameter transformation enables optimal balance between reliability and throughput based on actual channel conditions.
2Reliability
If STBC is applied to ensure reliable data transfer, then communication reliability is improved, but communication speed lowers
Solution Approach 1:
The patent applies local quality by selectively applying STBC only to specific data transmissions where it is actually needed. The determination unit evaluates channel variation for each communication decision, applying STBC locally to packets sent during high-variation periods while using faster non-STBC methods during stable periods. This localized application of error correction ensures reliability when necessary without permanently sacrificing communication speed.
Solution Approach 2:
The patent uses partial action by applying STBC encoding only partially - specifically when channel variation exceeds the threshold - rather than continuously. This selective application provides sufficient error protection during problematic channel conditions while avoiding the speed penalty during stable conditions, optimizing the trade-off between reliability and speed.
3Adaptability or versatility
If communication method switches based on instantaneous transmission characteristic, then adaptation to channel conditions is improved, but system stability worsens
Solution Approach 1:
The patent applies preliminary action by calculating channel variation over multiple time points before making a communication method decision. Instead of reacting to instantaneous conditions, the system预先 computes the variation metric and compares it against a threshold before selecting STBC or non-STBC. This preliminary calculation smooths out transient fluctuations and prevents premature switching, improving system stability while maintaining adaptability to genuine channel changes.
Solution Approach 2:
The patent provides beforehand cushioning by using a threshold-based decision mechanism that cushions against premature communication method switching. The threshold acts as a buffer that absorbs transient channel variations, preventing unnecessary switches between STBC and non-STBC modes. This cushioning effect stabilizes the communication method selection while still allowing adaptation to sustained channel condition changes.
Data Source
AI summary
When communication apparatuses each having a plurality of antennas perform a data communication using a plurality of transmission channels formed by space division multiplexing, whether or not to perform a highly reliable communication is determined based on the variation of a transmission characteristic in the plurality of transmission channels.