RF Circuit SRS Amplification for DL-MIMO Leakage Compensation
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Solution Overview
Problem
Conventional technologies experience deteriorated communication quality in downlink Multiple Input Multiple Output (DL-MIMO) due to signal distortion from uplink communication in another band.
Innovation Solution
A radio frequency circuit with separate power amplifiers and low-noise amplifiers for each antenna connection terminal, amplifying sounding reference signals based on signal-to-noise ratio deterioration caused by signal distortion in other bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If downlink MIMO and uplink communication in another band are simultaneously used, then communication systems can support multi-band and multi-mode operations, but communication quality of DL-MIMO deteriorates due to signal distortion from uplink signals leaking through the same antenna connection terminal
Solution Approach 1:
The patent segments the power amplification function by providing separate power amplifiers for different bands. Specifically, a first power amplifier is dedicated to amplifying downlink MIMO signals in the first band, while a second power amplifier handles uplink signals in the second band. This segmentation prevents signal mixing and distortion that would occur with a shared amplifier, thereby maintaining DL-MIMO communication quality while supporting multi-band operations.
Solution Approach 2:
The patent applies local quality by configuring power amplifiers with band-specific characteristics optimized for their respective frequency ranges. The first power amplifier is designed with parameters optimized for the first band (downlink MIMO), while the second power amplifier is optimized for the second band (uplink). This ensures that each signal path has the appropriate amplification characteristics for its intended function, preventing interference and maintaining signal integrity across both bands.
2Reliability
If separate power amplifiers are provided for each antenna connection terminal, then signal distortion is reduced and DL-MIMO performance is improved, but device complexity increases
Solution Approach 1:
The patent achieves universality by designing power amplifiers that can handle multiple functions through selective activation. Each power amplifier is capable of operating in different modes depending on the communication scenario. For example, the first power amplifier can handle both downlink MIMO transmission and uplink transmission in the first band when needed, while the second power amplifier similarly provides multi-band support. This reduces the total number of amplifiers required compared to having dedicated amplifiers for every possible function.
Solution Approach 2:
The patent implements dynamic operation where power amplifiers can switch between different operating states based on communication requirements. The system dynamically selects which power amplifier to use and at what power level depending on whether downlink MIMO, uplink, or both are active simultaneously. This dynamic adaptability allows the system to maintain high signal quality while optimizing the use of available amplification resources, thereby reducing overall device complexity.
Data Source
AI summary
A radio frequency circuit that supports simultaneous communication using downlink MIMO in a first band and uplink communication in a second band includes first and second power amplifiers connected to first and second antenna terminals, respectively. When a first SRS in the first band is output through the first antenna terminal, the first power amplifier amplifies the first SRS, according to a first deterioration amount of a signal-to-noise ratio in the first band due to distortion of a transmission signal in the second band having leaked in through the first antenna terminal, and when a second SRS in the first band is output through the second antenna terminal, the second power amplifier amplifies the second SRS, according to a second deterioration amount of the signal-to-noise ratio in the first band due to distortion of the transmission signal in the second band having leaked in through the second antenna terminal.