Adaptive MIMO Transmission Scheme for Low-PAR Wireless Links
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Solution Overview
Problem
In wireless communication systems with multiple antennas, the high peak-to-average power ratio (PAR) of transmitted signals increases power consumption and reduces amplifier efficiency, especially in environments with obstacles that create correlated sub-channels, affecting data throughput and reliability.
Innovation Solution
A data transmission method that selects between transmitting different data from each antenna independently or the same data with controlled direction based on communication link quality and antenna correlation, using MIMO schemes like information MIMO and spatial beamforming to maintain low PAR and enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waterfilling transmission scheme is used to transmit more data into high-quality sub-channels, then data throughput is improved, but peak-to-average power ratio increases and power consumption increases
Solution Approach 1:
The patent applies dynamics by making the transmission scheme adaptive and changeable based on channel conditions. The system dynamically selects between different transmission schemes (waterfilling, equal power, beamforming) according to the quality of sub-channels and correlation characteristics, rather than using a fixed scheme. This allows the system to optimize performance for varying environmental conditions.
Solution Approach 2:
The patent changes the transmission parameters (power allocation, beamforming weights) based on channel correlation characteristics. When sub-channels are highly correlated, the system switches to beamforming with specific power allocation rather than waterfilling, thereby changing the operational parameters to maintain low PAR while adapting to the correlated channel conditions.
2Productivity
If signals are summed for transmission into multiple sub-channels, then data throughput is improved, but peak-to-average power ratio increases and amplifier efficiency reduces
Solution Approach 1:
The patent applies local quality by treating different sub-channel conditions differently. When sub-channels are highly correlated, the system uses beamforming to focus energy in specific directions rather than distributing power uniformly or using waterfilling. This localized approach to power allocation and signal transmission maintains amplifier efficiency while still achieving good throughput in correlated channel conditions.
3Productivity
If multiple antennas are used for MIMO communication, then spectral efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the MIMO transmission into different schemes based on channel conditions. Instead of using a complex fixed MIMO scheme, the system segments the transmission approach into simpler alternatives (waterfilling, equal power, beamforming) and selects the appropriate segment based on channel correlation characteristics, thereby reducing overall system complexity while maintaining spectral efficiency.
Data Source
AI summary
The invention provides a data transmission solution in a telecommunication system. According to the invention, a data transmission scheme is selected for a first transceiver unit, which comprises a plurality of transmit antennas, on the basis of the quality of a communication link and transmit antenna correlation information associated with the first transceiver unit, from a list including at least the following data transmission schemes: transmitting different data from each antenna of the first transceiver unit, the data transmitted from one antenna being independent of the data transmitted from another antenna; and transmitting the same data from each antenna of the first transceiver unit and controlling the direction of the transmitted data according to the properties of a radio channel. The selection of the data transmission scheme is carried out during an active communication link between the first and a second transceiver unit.