MU-MIMO Power Loading and MCS Adjustment
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Solution Overview
Problem
Conventional MU-MIMO systems waste transmission power and increase packet error probability due to the need for padding bits to align varying data stream lengths, which also causes interference with other data streams and co-channel networks.
Innovation Solution
Implement power loading and modulation and coding scheme (MCS) adjustments to align data stream terminations with minimal padding, compensating for changes in MCS by adjusting power levels to maintain overall power efficiency and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If padding bits are added to align data stream lengths, then data transmission alignment is improved, but transmission power is wasted and packet error probability increases
Solution Approach 1:
The patent applies parameter changes by adjusting the power allocation for each data stream based on its length and channel conditions. Instead of using fixed power allocation with padding, the system dynamically modifies power parameters to match data stream characteristics, eliminating the need for excessive padding while maintaining alignment.
Solution Approach 2:
The patent implements local quality by applying different power levels to different data streams according to their specific requirements. Each stream receives customized power allocation based on its length, modulation scheme, and channel quality, rather than uniform power distribution, thereby optimizing efficiency for each local data transmission scenario.
2Manufacturing precision
If padding bits are added to align data stream lengths, then data transmission alignment is improved, but interference with other data streams and co-channel networks increases
Solution Approach 1:
The patent changes the power parameter for each data stream to match its specific length and channel conditions. By dynamically adjusting power allocation rather than using fixed padding, the system achieves alignment without transmitting unnecessary padding bits that would create interference with other streams and co-channel networks.
3Loss of energy
If power loading and MCS adjustments are implemented, then power efficiency is improved, but system complexity increases
Solution Approach 1:
The patent employs parameter changes by jointly optimizing power allocation and modulation and coding schemes (MCS) for each data stream. The base station calculates optimal power and MCS combinations based on channel state information, achieving improved power efficiency while managing complexity through algorithmic optimization rather than hardware complexity.
Data Source
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AI summary
Embodiments of a system and method for transmitting data from an access point in a multiple user multiple input multiple output (MU-MIMO) system are provided. A first indication of signal quality (ISQ) is received at the access point from a first station and a second ISQ is received from a second station. The access point sets a first power level and a first modulation and coding scheme (MCS) for transmission of a first aggregated media access control (MAC) protocol data unit (A-MPDU) to the first station as a function of the first ISQ and an amount of payload data corresponding to the first A-MPDU. The access point also sets a second power level and a second MCS for transmission of a second A-MPDU as a function of the second ISQ and an amount of payload data corresponding to the second A-MPDU.