Antenna Alignment via Dual-Mode Link Budget Switching
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Solution Overview
Problem
Existing antenna alignment methods in wireless communication systems face challenges in accurately aligning directional antennas, particularly in millimeter-wave links, due to the narrow angular range for signal detection and high sensitivity to alignment errors, which complicates initial setup and maintenance of communication links.
Innovation Solution
The method involves switching between a normal operational mode and an alignment operational mode, with the latter providing an improved link budget by using a lower symbol rate, fewer constellation symbols, higher pilot symbol density, longer synchronization sequences, and a lower forward error correction code rate, allowing communication via antenna side lobes and enabling reliable signal measurement over a wider angular range for alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If directional antennas are used for millimeter-wave communication, then communication bandwidth and data rate are improved, but antenna alignment becomes highly sensitive and difficult due to narrow angular range
Solution Approach 1:
The patent applies preliminary action by performing antenna alignment using normal operational mode signals before fully establishing millimeter-wave communication. The system first aligns antennas using robust, lower-frequency signals that have wider angular coverage, then transitions to high-data-rate millimeter-wave operation. This preliminary alignment step prevents the narrow beamwidth of directional antennas from causing alignment difficulties during actual high-speed communication.
Solution Approach 2:
The patent uses an intermediary approach by employing dual-mode operation with normal operational mode signals serving as a mediator for alignment. These normal mode signals act as an intermediate step between rough alignment and precise millimeter-wave alignment, providing a bridge that enables easier initial setup before switching to the high-performance but narrow-beam millimeter-wave mode.
2Productivity
If normal operational mode is used for alignment, then communication data rate is maintained, but alignment accuracy is insufficient due to narrow main lobe coverage
Solution Approach 1:
The patent applies dynamics by dynamically switching between normal operational mode and alignment operational mode. The system transitions from normal mode (with narrow main lobe) to alignment mode (with wider effective coverage through side lobe utilization), performs alignment measurements, then returns to normal mode for high-speed communication. This dynamic mode switching enables the system to overcome the limitation of narrow main lobe coverage during alignment while maintaining high data rates during operation.
Solution Approach 2:
The patent changes operational parameters by switching modulation schemes, symbol rates, and signal characteristics between normal and alignment modes. During alignment, the system modifies transmission parameters to enable detection over wider angular ranges, then restores optimal communication parameters for high-speed data transfer. This parameter transformation allows the same antenna system to perform both alignment and high-rate communication effectively.
3Measurement precision
If alignment operational mode with lower symbol rate is used, then alignment measurement precision is improved, but communication productivity decreases
Solution Approach 1:
The patent applies periodic action by alternating between normal operational mode (high data rate) and alignment operational mode (lower symbol rate, higher precision). The system periodically switches to alignment mode to perform measurement and adjustment, then returns to normal mode for high-speed communication. This periodic switching between modes with different performance characteristics allows the system to maintain both high productivity during operation and high measurement precision during alignment phases.
Solution Approach 2:
The patent uses dynamics to transition between operational states with different performance trade-offs. The system dynamically adjusts symbol rate and modulation complexity based on whether it is in alignment phase or communication phase, optimizing performance for the current task while accepting temporary reduction in data rate during alignment measurements.
4Ease of operation
If additional alignment equipment is added, then alignment capability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the existing communication system perform dual functions: normal data communication and alignment measurement. The same transceiver, antenna, and signal processing hardware are used for both high-speed communication and alignment operations, eliminating the need for separate alignment equipment. The system achieves multi-functionality through software-controlled mode switching and signal parameter adjustment.
Solution Approach 2:
The patent implements self-service by enabling the communication system to perform its own alignment using its existing hardware resources. The system uses its own transceiver and antenna to generate and detect alignment signals, eliminating dependence on external alignment equipment. This self-aligned approach reduces device complexity while maintaining alignment capability through intelligent signal processing and mode switching.
Data Source
AI summary
A method for antenna alignment includes defining a first link budget for wireless communication between first and second communication systems via respective first and second antennas in a normal operational mode in which a main lobe of the first antenna points toward the second antenna. The first antenna is aligned to point to the second antenna responsively to an alignment indication provided by communicating between the first and second communication systems in an alignment operational mode having a second link budget greater than the first link budget.