Fingerprint-Based Beam Interference Cancellation in Millimeter Wave Systems
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Solution Overview
Problem
Millimeter wave massive MIMO systems face challenges in hardware complexity and high power consumption due to the need for multiple RF chains, and existing beam selection methods suffer from high overhead and interference issues, particularly in 5G networks aiming for high data transfer rates and reliability.
Innovation Solution
A fingerprint-based beam interference cancellation system that constructs databases using location information and reference signal reception power to select and align beams, canceling intra-group and inter-group interference, thereby reducing the number of RF chains required and improving data transfer rates and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exhaustive beam search is used to select the best beam, then transmission speed and energy efficiency are maximized, but hardware complexity and power consumption increase due to requiring multiple RF chains
Solution Approach 1:
The patent segments the beam selection process into two phases: an exhaustive beam search phase to identify candidate beams, and a fingerprint-based interference cancellation phase to select the final beam. This segmentation allows the system to benefit from exhaustive search without requiring all beams to be simultaneously active, thus reducing the number of RF chains needed at any given time.
Solution Approach 2:
The patent performs preliminary beam search and fingerprint database construction before actual data transmission. By pre-identifying the best beams and storing their interference characteristics in a fingerprint database, the system avoids the need for complex real-time interference management during transmission, reducing hardware complexity while maintaining high transmission speed.
2Productivity
If exhaustive beam search is used to select the best beam, then transmission speed and energy efficiency are maximized, but power consumption increases due to requiring multiple RF chains
Solution Approach 1:
The patent segments the beam selection process into an offline exhaustive search phase and an online fingerprint-based selection phase. During offline processing, multiple beams are evaluated to build the fingerprint database. During online operation, only the selected best beam is activated, significantly reducing power consumption compared to keeping multiple RF chains active simultaneously.
Solution Approach 2:
The patent performs preliminary beam evaluation and fingerprint database construction before actual transmission. This allows the system to identify the optimal beam in advance, enabling single-beam transmission that consumes less power while maintaining high transmission speed during data transfer.
3Measurement precision
If beam selection is based on complete channel state information estimation, then accurate beam selection is achieved, but overhead increases due to sequential transmission of all beams
Solution Approach 1:
The patent performs preliminary exhaustive beam search and channel state information estimation offline to construct the fingerprint database. By completing the time-consuming measurements in advance, the system avoids sequential beam transmission overhead during actual data transfer, achieving both accurate beam selection and reduced latency.
Solution Approach 2:
The patent creates a fingerprint database that copies and stores the interference characteristics of all beams during offline processing. This database serves as a reference for rapid beam selection online, eliminating the need to re-transmit all beams sequentially during data transfer, thus reducing overhead while maintaining selection accuracy.
4Device complexity
If the same beam is selected by different RF chains to reduce hardware complexity, then hardware cost and power consumption are reduced, but interference is generated between multiuser terminals
Solution Approach 1:
The patent converts the harmful effect of beam interference into a useful characteristic by using it as a fingerprint to identify and cancel interference. The fingerprint database stores interference patterns caused by beam reuse, which are then used in the online phase to selectively cancel intra-group and inter-group interference, allowing beam reuse without harmful interference.
Solution Approach 2:
The patent introduces an interference cancellation mechanism as an intermediary between beam selection and data transmission. The fingerprint-based interference cancellation process acts as a mediator that identifies interference from reused beams and cancels it before data transmission, enabling hardware complexity reduction through beam reuse while eliminating the resulting interference.
Data Source
AI summary
A fingerprint-based beam interference cancellation system and a method thereof are proposed. A communication part receives location information and reference signal reception power which is strength of a received signal provided from each user terminal in response to a reference signal, a fingerprint DB construction part constructs a fingerprint database by receiving the reference signal reception power and the location information, a group-based fingerprint DB construction part constructs a group-based fingerprint database by grouping user terminals, aligning the remaining beams, generating group fingerprint data with the aligned beams, and using the generated group fingerprint data, a first beam interference cancellation part generates a beam set for each group from which beam interference within the group is cancelled, and a second beam interference cancellation part removes beams redundant between the groups and cancels intra-group and inter-group beam interference in millimeter wave communication, thereby improving reliability and data transfer rate.