Dynamic Uplink Control via Segmented Transmit Chains
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Solution Overview
Problem
Conventional RF communication systems face challenges in extending bandwidth for digital pre-distortion due to sampling rate limitations and high digital power consumption, leading to reduced performance with wide bandwidth signals and stringent linearity requirements, which result in power back-offs and limited power capability.
Innovation Solution
The system partitions a radio frequency signal into multiple components amplified by separate power amplifiers and transmitted via separate antennas, allowing for relaxed baseband modulation sampling rates and enhanced RF front-end linearity, thereby managing intermodulation distortion and achieving higher transmit power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transmit chain is used for both LTE and 5G signals, then device complexity is reduced, but intermodulation distortion increases and power capability is limited
Solution Approach 1:
The patent divides the transmit system into separate transmit chains for LTE and 5G signals. Each transmit chain includes its own power amplifier and antenna, allowing independent operation and eliminating intermodulation distortion between the two signal types while maintaining manageable device complexity through modular architecture.
2Object-generated harmful factors
If transmissions of LTE and 5G signals are staggered over time, then intermodulation distortion is reduced, but transmission efficiency decreases
Solution Approach 1:
By implementing separate transmit chains, the patent enables simultaneous transmission of LTE and 5G signals without time staggering, thereby maintaining transmission efficiency while eliminating intermodulation distortion through physical separation of the signal paths.
3Power
If multiple power amplifiers are used for separate antennas, then output power capability is increased, but device complexity increases
Solution Approach 1:
The patent implements separate power amplifiers for LTE and 5G transmit chains, enabling independent power control and higher output power capability for each signal type. The modular design with dedicated power amplifiers for each antenna path manages complexity through standardized, interchangeable components.
4Manufacturing precision
If digital pre-distortion is applied to wide bandwidth signals, then linearity is improved, but sampling rate requirements increase and power consumption increases
Solution Approach 1:
The patent segments the signal transmission into separate analog paths with dedicated power amplifiers for LTE and 5G signals, reducing the bandwidth requirements for digital pre-distortion. This segmentation allows lower sampling rates and reduced digital power consumption while maintaining adequate linearity through analog signal conditioning.
Data Source
AI summary
Apparatus and methods for dynamic control of single switched uplink versus multi uplink are provided. In certain embodiments, a mobile device includes a front end system including a first transmit chain and a second transmit chain. The mobile device further includes a transceiver that transmits a first type of RF signal and a second type of RF signal by way of the front end system. The transceiver is operable in a first mode in which transmissions of the first type of RF signal and the second type of RF signal are staggered, and a second mode in which transmissions of the first type of RF signal and the second type of RF signal at least partially overlap in time. The transceiver includes a transmit control circuit that operates the transceiver in the first mode or the second mode based on comparing a transmit parameter to a threshold.