Antenna Transmit Power Control for Massive Connectivity
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting massive connectivity and achieving high spectral efficiency due to the increasing density of devices, particularly in 6G cellular systems where channel similarity can lead to interference and decoding failures.
Innovation Solution
The system controls the transmit power of multiple antennas to create power-level disparity between signals, allowing for efficient decoding even when channels are similar. This is achieved by adjusting symbol amplitudes and using power scaling coefficients, enabling open-loop transmission without instantaneous channel knowledge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices transmit using the same physical resources in high-density scenarios, then spectral efficiency and connectivity capacity are improved, but channel similarity causes interference and decoding failures
Solution Approach 1:
The patent applies parameter changes by introducing power scaling coefficients that modify the transmit power levels of different antennas. This creates power-level disparity in the received signals, which is a key parameter change that enables the receiver to distinguish between signals from different devices even when their channels are similar, thus resolving the interference problem while maintaining high spectral efficiency
Solution Approach 2:
The patent employs asymmetry by deliberately creating asymmetric power distribution across multiple transmit antennas. Instead of equal power transmission, the system uses different power scaling coefficients for different antennas, creating an asymmetric power profile that provides the receiver with additional information to differentiate between devices and improve decoding reliability in high-density scenarios
2Quantity of substance
If traditional multiple access schemes are used to support massive connectivity, then device density is increased, but signaling overhead increases and resource allocation becomes complex
Solution Approach 1:
The patent merges multiple access functions into a unified power-domain separation mechanism. By combining power control with multiple antenna transmission, the system creates a compact solution that supports massive connectivity without requiring complex separate resource allocation mechanisms for each device, thus reducing overall system complexity while increasing connection density
3Reliability
If power control is implemented to create power-level disparity, then decoding performance is improved, but transmit power management complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring power scaling coefficients for different antennas before transmission occurs. These coefficients are determined in advance based on device characteristics and channel conditions, allowing the transmitter to simply apply the pre-determined power levels during transmission without requiring complex real-time power control calculations, thus improving decoding performance while limiting the increase in control complexity
Data Source
AI summary
In one embodiment, a method includes accessing a sequence of symbols, generating a signal from the symbols by mapping a first symbol to a first antenna and a second antenna, determining a first transmit power for the first symbol in the first antenna based on a first power scaling coefficient and a second transmit power for the first symbol in the second antenna based on a second power scaling coefficient, mapping a second symbol to the first antenna and the second antenna, determining a third transmit power for the second symbol in the first antenna based on a third power scaling coefficient and a fourth transmit power for the second symbol in the second antenna based on a fourth power scaling coefficient, wherein the first, second, third, and fourth transmit power is different from each other, and transmitting the generated signal by the first antenna and the second antenna.