Transmission Apparatus PA Capability Signal Allocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in LTE-A, the use of multiple power amplifiers (PAs) with different capacities leads to distortion due to nonlinearity when switching between transmission modes or allocating signals with different peak powers without considering PA capabilities, resulting in degraded transmission performance.
Innovation Solution
A transmission apparatus with multiple PAs and antennas determines the transmission signal based on each PA's capability, allocating signals with different Peak to Average Power Ratios (PAPR) characteristics to optimize power usage, allowing for discrete or contiguous band allocation and pre-coding to improve transmission efficiency without considering back-off, thereby reducing distortion and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signals with different peak powers are transmitted without considering PA capabilities, then transmission flexibility is improved, but distortion occurs due to PA nonlinearity and transmission performance degrades
Solution Approach 1:
The patent applies local quality by assigning different transmission characteristics to different PAs based on their individual capabilities. Specifically, the PA with higher capacity transmits signals with higher peak power (such as Clustered DFT-S-OFDM signals), while the PA with lower capacity transmits signals with lower peak power (such as DFT-S-OFDM signals). This localized optimization of signal characteristics to match each PA's capabilities eliminates distortion from nonlinearity while preserving transmission flexibility.
Solution Approach 2:
The patent changes the transmission parameters (signal type, peak power level, modulation scheme) based on the PA's capacity parameter. By dynamically selecting which signals to transmit through which PA according to their peak power requirements and the PA's 1dB compression point, the system optimizes both reliability and adaptability without requiring back-off operation.
2Reliability
If back-off is applied to avoid PA nonlinearity, then distortion is reduced, but transmission power is reduced and efficiency decreases
Solution Approach 1:
The patent performs preliminary action by determining the capability of each PA in advance (such as the 1dB compression point) and pre-planning the signal allocation before transmission. This allows the system to directly transmit signals at optimal power levels without requiring back-off, thereby maintaining both signal quality and transmission efficiency simultaneously.
3Adaptability or versatility
If multiple PAs with different capacities are used, then power flexibility is improved, but complexity of PA configuration and signal allocation increases
Solution Approach 1:
The patent applies self-service by enabling each PA to autonomously determine its own signal allocation based on its inherent capability characteristics. The system automatically matches signals to PAs according to their peak power requirements and capabilities without requiring complex external control or coordination, thereby reducing configuration complexity while maintaining power flexibility.
Data Source
AI summary
A mobile station apparatus includes a plurality of PAs (Power Amplifiers) and a plurality of antennas and transmission performances thereof is to be improved when transmission signals having peak powers different from one another are transmitted through the use of the respective antennas. A transmission apparatus includes a plurality of PAs and a plurality of antennas and transmits a signal having a high peak power, by means of determining a transmission signal to be transmitted through the use of each of the PAs based on the capability of each of the PAs, converting the transmission signal into a frequency signal by time-frequency conversion, dividing the frequency signal into a plurality of clusters, and allocating the clusters to bands non-contiguously. Furthermore, the transmission apparatus transmits a signal having a low peak power by means of allocating the frequency signal to continuous bands.