Spatial Filtering via Angle Deviation Estimation
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Solution Overview
Problem
In direct communication systems between portable terminals, existing beamforming technologies require a large number of antennas to narrow the beam width, making it difficult to mount multiple antennas in portable devices, leading to increased space occupation and inefficient communication due to the need for prior recognition of terminal information, which is inconvenient and time-consuming.
Innovation Solution
An apparatus and method for spatial filtering using spatial random jitter beamforming (SRJBF) that estimates the angle of deviation between terminals, allowing for the identification of target terminals in a specific direction without increasing the number of antennas, by processing signals with a radio frequency processor, synchronization processor, received signal processor, and angle estimator to demodulate user-defined and SRJBF sequences, thereby reducing the search range and communication overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of antennas is increased to narrow the beam width, then the spatial resolving power is improved, but the space occupied by the antennas increases making it difficult to mount in portable terminals
Solution Approach 1:
The patent changes the operational parameters of the existing antenna system by implementing spatial random jitter beamforming, which dynamically adjusts beamforming weights and introduces temporal jitter to the beamforming process. This allows the system to achieve narrower effective beam widths and improved spatial resolution without adding physical antennas, thereby resolving the contradiction between spatial resolving power and antenna space occupation
Solution Approach 2:
The patent introduces dynamic beamforming techniques where the beamforming weights are continuously adjusted and jittered in time. This dynamic approach allows the system to achieve finer angular resolution through temporal variations in beam patterns rather than relying solely on static antenna spacing, thus improving spatial resolving power without increasing the physical antenna array size
2Productivity
If beamforming technology is used to limit connectable terminals to specific directions, then the search range is reduced and connection efficiency is improved, but the device complexity increases due to the need for multiple antennas
Solution Approach 1:
The patent modifies the beamforming parameters by introducing spatial random jitter, which varies the beamforming weights dynamically. This allows the system to maintain directional selectivity and connection efficiency while using a fixed, smaller number of antennas, thereby improving productivity without proportionally increasing device complexity
Solution Approach 2:
The patent implements periodic jittering of beamforming weights where the beam pattern is intentionally modulated in a periodic or pseudo-random manner. This periodic action enables the system to scan and identify terminals in specific directions over time, maintaining connection efficiency while avoiding the need for complex static multi-antenna configurations
Data Source
AI summary
An apparatus for spatial filtering receives a signal transmitted from a first terminal and detects a synchronization start point in time from a transmission frame included in the signal. The apparatus for spatial filtering demodulates a user-defined sequence included in the transmission frame and the at least one SRJBF sequence when the synchronization start point in time is detected, and then estimates a relative angle based on the demodulated user-defined sequence and SRJBF sequence.