OFDMA Subchannel Transmission Rate Control via Channel Estimation
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Solution Overview
Problem
In orthogonal frequency division multiple access (OFDMA) systems, setting a proper transmission rate for subchannels with insufficient retry data or no retry data is challenging, as existing methods rely on analyzing data from few subchannels, leading to inadequate rate setting for those without sufficient data.
Innovation Solution
A wireless communication system and method that utilize a lookup table to correlate transmission rates with channel indicators, where the processor selects a reference channel indicator based on differences between subchannel estimated values and sets the transmission rate for subchannels with insufficient data by referencing the lookup table, leveraging channel characteristics from subchannels with sufficient data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission rate is set based on retry data analysis from subchannels, then transmission rate accuracy is improved for subchannels with sufficient data, but transmission rate setting becomes inadequate for subchannels with insufficient or no retry data
Solution Approach 1:
The patent introduces channel estimated values as an intermediary parameter to bridge the gap between subchannels with sufficient retry data and those without. By using channel estimation techniques, the system can infer transmission rate information for subchannels lacking retry data, thereby extending the applicability of rate setting across all subchannels while maintaining accuracy.
Solution Approach 2:
The patent copies channel characteristics and transmission rate patterns from subchannels with sufficient retry data to subchannels with insufficient data. By analyzing retry data from one or more subchannels and applying the derived transmission rate settings to other subchannels, the system effectively replicates successful rate adaptation strategies across the entire set of subchannels.
2Device complexity
If retry data from few subchannels is used for analysis, then data processing complexity is reduced, but transmission rate setting becomes inadequate for subchannels without sufficient data
Solution Approach 1:
The patent creates a universal transmission rate setting mechanism that can handle both subchannels with sufficient retry data and those without. By establishing a lookup table that maps channel conditions to transmission rates, the system achieves multi-functionality: it can directly use retry data when available and fall back to channel estimation when data is insufficient, ensuring reliable rate setting across all scenarios without significantly increasing processing complexity.
3Productivity
If transmission rate is optimized for subchannels with sufficient retry data, then overall transmission performance is improved, but subchannels with insufficient data cannot benefit from proper rate setting
Solution Approach 1:
The patent implements a feedback mechanism where transmission rate settings are continuously refined based on retry data from subchannels. The system monitors transmission outcomes and uses this feedback to update the lookup table and channel estimates, ensuring that all subchannels progressively benefit from optimized rate settings even if they initially had insufficient data.
Data Source
AI summary
A wireless communication system includes a transceiver circuit, a memory circuit, and a processor circuit. The transceiver circuit transmits data through subchannels that includes a first subchannel and a second subchannel. The memory circuit stores a lookup table that indicates corresponding relations between transmission rates and channel indicators. The processor circuit selects a first channel indicator from the lookup table according to a first transmission rate of the first subchannel during a statistics interval, determines a difference between the first channel estimated value of the first subchannel and a second channel estimated value of the second subchannel, determines a reference channel indicator according to the difference and the first channel indicator, and selects a corresponding transmission rate from the lookup table according to the reference channel indicator, in order to set a transmission rate of the transceiver circuit over the second subchannel to be the corresponding transmission rate.