UWB-Assisted mmWave Beam Alignment via Multi-Frequency AoA
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Solution Overview
Problem
In mmWave communication, beam alignment is challenging due to the wide beam of a small number of antennas at User Equipment devices, leading to strong attenuation of multipath components, which existing methods struggle to overcome effectively.
Innovation Solution
The use of ultra-wideband (UWB) signals at two or more frequencies to align mmWave beams by computing the angle of arrival spectrum and aligning the mmWave beam based on this spectrum, potentially employing a convolutional neural network for fine-grained angle estimation when confidence thresholds are not met.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small number of antennas are used at the UE device, then device complexity is reduced, but beam alignment accuracy deteriorates because the beam becomes wide
Solution Approach 1:
The patent transitions from spatial domain beam alignment to frequency domain beam alignment by using multiple UWB carrier frequencies. Instead of relying on multiple antennas in space, the system uses multiple frequency components to achieve fine-grained angle estimation, effectively moving the problem from one dimension (spatial) to another (frequency).
Solution Approach 2:
The patent changes the parameter used for beam alignment from spatial configuration (number of antennas) to frequency configuration (number of UWB carrier frequencies). By adjusting frequency parameters rather than hardware configuration, the system achieves high precision with limited antennas.
2Area of stationary object
If beam width is increased to cover more directions, then coverage area is improved, but beam alignment precision deteriorates due to wide beam attenuation
Solution Approach 1:
The patent resolves the coverage-precision tradeoff by introducing frequency dimension. Multiple UWB carrier frequencies provide both broad coverage capability and fine precision through spectral analysis, eliminating the need to compromise between beam width and alignment accuracy in the spatial domain alone.
Solution Approach 2:
The system dynamically adjusts beam alignment based on AoA spectrum analysis from multiple frequencies, allowing adaptive refinement of beam direction rather than relying on fixed wide beams. This dynamic approach maintains coverage while achieving precise alignment.
3Device complexity
If traditional beam alignment methods are used with limited antennas, then device simplicity is maintained, but multipath component attenuation increases
Solution Approach 1:
The patent introduces UWB frequency domain analysis as an intermediary mechanism between the limited antennas and the mmWave beam alignment. This intermediary AoA spectrum computation enables effective multipath component identification and beam alignment without requiring additional antennas, thereby reducing energy loss from misalignment.
Data Source
AI summary
A first device and second device communicate using mmWave communication with antenna alignment based on processing of ultra wide band (UWB) pulses. A limit on angle resolution due to a small number of antennas on either of the devices is relieved by using two or more carrier frequencies in the UWB pulses. A limit on angle resolution is further overcome in some situations by use of a neural network to refine angle estimates. In some situations, received power values are further used to select an angle for beam alignment.