Wireless Transmitter Diversity Scheme Selection Based on Peak Power
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Solution Overview
Problem
In the uplink of LTE wireless communication systems, existing transmission diversity schemes face challenges in managing peak power, leading to distortion and inefficiencies, particularly for mobile stations that require high transmission power, especially at the cell edge.
Innovation Solution
A wireless communication system with multiple transmitting antennas that dynamically selects between different transmission diversity schemes based on transmission power, using indices like cubic metric (CM) and peak-to-average power ratio (PAPR), to switch between high and low peak power schemes, optimizing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission diversity schemes with high peak power are used, then transmission diversity performance is improved, but peak power distortion occurs and transmission efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the transmission diversity scheme selectable based on transmission power conditions. The system can switch between different transmission diversity schemes (e.g., SFBC, CDD) depending on the peak power characteristics, allowing optimal performance while avoiding distortion when peak power is high.
Solution Approach 2:
The patent changes the parameter of transmission diversity scheme selection based on transmission power conditions. By monitoring peak power levels and selecting appropriate schemes accordingly, the system adapts to different transmission scenarios to balance diversity performance with power distortion avoidance.
2Productivity
If transmission diversity schemes are used to improve transmission efficiency, then power consumption is reduced, but peak power management becomes more complex
Solution Approach 1:
The patent implements feedback mechanisms where the transmission device monitors transmission power conditions and uses this information to select appropriate transmission diversity schemes. This feedback loop enables automatic adaptation to power conditions, managing complexity through intelligent control rather than manual configuration.
Solution Approach 2:
The patent makes the transmission device multi-functional by enabling it to handle multiple transmission diversity schemes and power conditions through a single unified system. The device can operate with different schemes (SFBC, CDD) and adapt to various power scenarios, reducing overall system complexity through versatility.
3Ease of manufacture
If fixed transmission diversity schemes are used, then implementation is simple, but adaptability to different transmission power conditions is poor
Solution Approach 1:
The patent transitions from static to dynamic operation by enabling the transmission diversity scheme to be selected based on real-time transmission power conditions. This dynamic adaptation maintains implementation simplicity while significantly improving adaptability to different power scenarios.
Solution Approach 2:
The patent changes the operational parameters by making transmission diversity scheme selection dependent on transmission power conditions. This parameter-based adaptation allows the system to maintain simplicity in implementation while achieving high adaptability through condition-based scheme selection.
Data Source
AI summary
A mobile station transmitting transmission signals using one of a plurality of transmission schemes which includes at least a first transmission scheme and a second transmission scheme, where in a case that the used transmission scheme is the first transmission scheme, the transmission signals are applied by an open loop (OL) in which precoding information is not fed back and in a case that the used transmission scheme is the second transmission scheme, the transmission signals are applied by a closed loop (CL) for which a precoding matrix indicator (PMI) is fed back from the mobile station. The first peak-to-average power ratio (PAPR) characteristics of the first transmission scheme differs from the second PAPR characteristics of the second transmission scheme.