Array Size Invariant Beamforming for Low PAPR Transmission
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Solution Overview
Problem
Existing beamforming solutions for single-carrier signals in large antenna arrays face challenges in maintaining low Peak to Average Power Ratio (PAPR) when transmitting multiple signals, leading to inefficient power amplification and reduced output power.
Innovation Solution
The method involves using array size invariant beamforming to transmit two signals in orthogonal wide beams, where each signal is transmitted using non-overlapping sub-arrays of antenna elements, thereby avoiding signal superposition and maintaining low PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If amplitude tapering is applied to create wide beams using all antenna elements, then the beam width is improved, but the power amplifier efficiency deteriorates due to reduced output power
Solution Approach 1:
The antenna array is divided into multiple sub-arrays, each responsible for forming a specific beam. This segmentation allows different sub-arrays to operate independently with full power amplification, avoiding the need for amplitude tapering across the entire array while still achieving wide beam coverage through coordinated operation of multiple sub-arrays.
2Power
If a subset of antenna elements is used to create wide beams with phase shifts only, then the power amplifier efficiency is improved, but the device complexity increases due to need for multiple precoders
Solution Approach 1:
Multiple sub-arrays are merged to form a complete wide beam system. Each sub-array uses simple phase shift precoding, but their combined operation achieves the wide beam effect that would otherwise require complex amplitude tapering, thus maintaining power amplifier efficiency while reducing individual precoder complexity.
3Area of stationary object
If multiple signals are transmitted using overlapping sub-arrays, then the signal coverage is improved, but the PAPR increases leading to power back-off
Solution Approach 1:
The antenna array is segmented into non-overlapping sub-arrays for transmitting different signals. This segmentation prevents signal superposition at any given spatial location, thereby maintaining low PAPR for each transmitted signal while still achieving comprehensive coverage through the combined radiation patterns of multiple sub-arrays.
Data Source
AI summary
Methods for transmitting a first signal x1 and a second signal x2 using a first array of antenna elements of a polarization A and a second array of antenna elements of a substantially orthogonal polarization B. The methods include transmitting x1 in a first beam generated with array size invariant beamforming, using a sub-array A1 of antenna elements from the first array and applying a first precoding matrix, and using a sub-array B1 of antenna elements from the second array and applying a second precoding matrix. The methods also include transmitting x2 in a second beam generated with array size invariant beamforming, using a sub-array A2 of antenna elements from the first array and applying a third precoding matrix, and using a sub-array B2 of antenna elements from the second array and applying a fourth precoding matrix. The sub-arrays within a polarization are typically non-overlapping.