MIMO Spatial Layer Decorrelation for PAPR Reduction
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Solution Overview
Problem
In wireless communication systems employing MIMO techniques, the peak-to-average power ratio (PAPR) of transmission signals is increased due to correlated signals across multiple spatial layers, leading to inefficient power amplification and potential distortion.
Innovation Solution
The system performs a decorrelation operation across spatial layers by applying unique phase rotation configurations to each spatial layer, ensuring orthogonality and reducing correlation between signals, thereby minimizing PAPR and enhancing power amplifier efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing MIMO is used to increase data throughput, then productivity is improved, but the peak-to-average power ratio increases causing harmful effects
Solution Approach 1:
The patent applies phase rotation transformations to the precoding matrix parameters, specifically rotating the phase of complex-valued precoding coefficients by an angle φ. This parameter transformation changes the signal characteristics across spatial layers, reducing the peak-to-average power ratio while preserving the data throughput benefits of spatial multiplexing MIMO.
2Device complexity
If correlated signals are transmitted across spatial layers to simplify transmission, then device complexity is reduced, but power amplifier efficiency deteriorates due to increased PAPR
Solution Approach 1:
The patent modifies the phase parameters of the precoding matrix by applying a rotation angle φ to the complex-valued coefficients. This parameter change decorrelates the signals across spatial layers, reducing constructive superposition and thereby lowering the peak-to-average power ratio, which improves power amplifier efficiency without significantly increasing device complexity.
Data Source
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AI summary
This document discloses s solution for improving transmission characteristics of a communication signal transmitted from a transmitter. According to an aspect, a method comprises: arranging, in a transmitter, information to be transmitted to a receiver, to a plurality of spatial layers where each spatial layer is associated with a unique precod-ing configuration amongst the plurality of spatial layers, wherein the information comprises at least one signal that is identical in a plurality of the plurality of spatial layers; per-forming, in the transmitter, a decorrelation operation across the plurality of spatial layers such that the at least one signal in one of the plurality of spatial layers becomes decorrelated with the at least one signal in another one of the plurality of spatial layers; and causing, in the transmitter, transmission of a transmission signal comprising the information in the plurality of spatial layers to the receiver.