Uplink Power Selection for Low-Resolution Massive MIMO Receivers
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Solution Overview
Problem
The power consumption and complexity of analog-to-digital/digital-to-analog converters (ADC/DAC) in massive MIMO systems scale linearly and exponentially with sampling rate and quantization bits, limiting the efficiency of beyond-5G systems operating in sub-THz bands, especially for low-resolution ADCs/DACs.
Innovation Solution
A client device and network node device implement a mechanism to adjust uplink transmission power levels using signal sequences, allowing efficient transmission with low-resolution ADCs/DACs by optimizing signal-to-noise ratio (SNR) through proactive power ramping and phase/amplitude estimation, without requiring hardware modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low-resolution ADCs/DACs are adopted to reduce power consumption and complexity, then hardware power consumption and complexity are reduced, but signal-to-noise ratio and transmission quality deteriorate
Solution Approach 1:
The system performs preliminary power ramping by transmitting multiple signal sequences with progressively increasing power levels before actual data transmission. This allows the receiver to identify the optimal power level in advance, ensuring that the selected power level provides sufficient signal-to-noise ratio for reliable reception while avoiding excessive power consumption that would worsen the contradiction.
Solution Approach 2:
The system implements feedback mechanisms where the receiver measures the quality of received signal sequences at different power levels and provides feedback to the transmitter. Based on this feedback, the transmitter selects the appropriate power level that achieves the required signal-to-noise ratio with minimum power, thus resolving the contradiction between power consumption and transmission quality.
2Device complexity
If low-resolution ADCs/DACs are adopted to reduce hardware complexity, then device complexity is reduced, but transmission reliability and quality of service deteriorate
Solution Approach 1:
The system performs preliminary measurements and optimizations before actual transmission by testing multiple signal sequences with different power levels. This preliminary action allows the system to establish optimal transmission parameters that compensate for the limitations of low-resolution ADCs/DACs, ensuring transmission reliability is maintained despite reduced hardware complexity.
Solution Approach 2:
The system dynamically adjusts transmission parameters including power level, signal sequence selection, and modulation schemes based on channel conditions and receiver feedback. These parameter changes enable the system to optimize transmission quality for each specific scenario, compensating for the fixed limitations of low-resolution converters and maintaining reliability without increasing hardware complexity.
3Reliability
If signal sequences are transmitted with different power levels to optimize SNR, then transmission quality is improved, but transmission time and overhead increase
Solution Approach 1:
The system transmits a limited set of predefined signal sequences with different power levels rather than exhaustively testing all possible power levels. This partial action approach finds a satisfactory solution within a reasonable time frame, balancing transmission quality optimization with time constraints, avoiding excessive transmission time while still achieving adequate signal-to-noise ratio.
Data Source
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AI summary
According to an example embodiment, a client device is configured to: obtain a signal sequence configuration defining a plurality of signal sequences, wherein each signal sequence in the plurality of signal sequences corresponds to an uplink transmission power level in a plurality of uplink transmission power levels; transmit the plurality of signal sequences according to the signal sequence configuration to a network node device; receive, from the network node device, an indication about an uplink transmission power level out of the plurality of uplink transmission power levels to be used for uplink transmission; and perform an uplink transmission using the indicated uplink transmission power level to the network node device.