Peak Suppression Information Multiplexing on PDSCH for PAPR Reduction
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Solution Overview
Problem
Wireless communication systems face inefficiencies due to high peak-to-average power ratios (PAPR) in OFDMA signaling, leading to increased power consumption and reduced power amplifier efficiency, especially when using higher-order constellations.
Innovation Solution
The technique involves clipping peak amplitudes of data signals and generating peak suppression information (PSIM) to reduce PAPR, which is then multiplexed with data on a physical downlink shared channel (PDSCH), allowing user equipment (UE) to reconstruct the original signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If peak amplitudes are clipped to reduce PAPR, then power amplifier efficiency is improved, but signal reconstruction accuracy deteriorates
Solution Approach 1:
The patent introduces peak suppression information (PSIM) as an intermediary element that mediates between the clipped signal and the original signal. The PSIM contains metadata about the clipped peaks (position, amplitude, phase) and enables the receiving device to reconstruct the original signal by adding back the suppressed peak information, thus resolving the contradiction between PAPR reduction and signal accuracy
Solution Approach 2:
The patent segments the signal processing into two independent parts: the clipped data signal for transmission and the peak suppression information for reconstruction. This segmentation allows the transmitter to reduce PAPR through clipping while the receiver can separately process the PSIM to restore the original signal characteristics, resolving the accuracy deterioration issue
2Use of energy by stationary object
If peak suppression information is multiplexed with data on PDSCH, then power consumption is reduced, but channel capacity is reduced
Solution Approach 1:
The patent merges the peak suppression information with the data transmission on the same PDSCH channel, combining two functions (data transmission and peak information transmission) into a single channel usage. This eliminates the need for separate signaling channels, reducing overall power consumption while utilizing the existing channel capacity efficiently
Solution Approach 2:
The PDSCH channel is given multi-functionality by simultaneously carrying both data signals and peak suppression information. This universal usage of the channel for multiple purposes reduces the need for additional dedicated channels, thereby reducing power consumption without requiring proportionally more channel resources
3Loss of time
If peak suppression information is transmitted in the same symbol, then latency is reduced, but signal quality deteriorates
Solution Approach 1:
The patent applies local quality by assigning different roles to different resources within the same symbol: some resource elements carry data while others carry peak suppression information. This localized differentiation allows both data and peak information to coexist in the same time slot without mutual interference, maintaining signal quality while minimizing latency
Data Source
AI summary
A base station may multiplex a peak suppression information message (PSIM) on a physical downlink shared channel (PDSCH) with data for efficient implementation of PSIMs for peak to average power ratio (PAPR) reduction. A base station may clip peaks from a signal to be transmitted and capture information of the clipped peaks into a PSIM. The base station may then multiplex the PSIM on the PDSCH such that a receiving device (for example, a user equipment (UE)) may receive the signal and reconstruct the signal (for example, PDSCH data) using the PSIM. According to some aspects, each PDSCH symbol may include a PSIM for a previous PDSCH symbol, or the PSIM may be for the current symbol. Various aspects of the techniques described herein may further provide for PSIM positioning in frequency, PSIM modulation, PSIM channel coding, PSIM multiple-input multiple-output (MIMO) configurations, among other examples.