Direction Division Multiple Access Using Digital DoA Tracking
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Solution Overview
Problem
Existing SDMA systems are complex, expensive, and prone to errors due to the need for beam steering antennas, especially when transceivers are moving, limiting their application in dynamic communication scenarios.
Innovation Solution
Implementing Directional Division Multiple Access (DDMA) using digital signals and a motion model to determine the direction of arrival (DoA) for received signals, allowing transceivers to use omnidirectional antennas for signal acquisition and switch to directional antennas for communication, thereby eliminating the need for complex beam steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam steering antennas are used in SDMA systems, then directional signal transmission and interference suppression are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the mechanical beam steering system with a digital signal processing system. Instead of physically steering antenna beams using complex hardware, the invention uses digital codes and signal processing algorithms to achieve directional communication. This substitution eliminates the need for complex beam steering mechanisms while maintaining the ability to transmit and receive directional signals reliably.
Solution Approach 2:
The patent uses digital codes as virtual representations of directional information. Rather than physically steering beams, the system creates digital copies of directional patterns through coded signals. The receiver uses correlation processing to identify and track these coded signals, effectively copying the directional information in the digital domain without requiring physical beam steering hardware.
2Adaptability or versatility
If beam steering is implemented in SDMA systems, then directional communication capability is improved, but ease of operation deteriorates due to tracking requirements for moving transceivers
Solution Approach 1:
The patent implements a self-tracking mechanism where the receiver automatically acquires and tracks the transmitted code without requiring external beam steering control. The correlation processor continuously monitors incoming signals and automatically locks onto the correct directional code, enabling the system to self-adjust to moving transceivers without complex external control mechanisms.
Solution Approach 2:
The patent uses preliminary code assignment where each transceiver is pre-assigned a unique directional code. This preliminary configuration eliminates the need for real-time beam steering calculations and tracking adjustments. The system is pre-configured to handle directional communication, and the correlation processor automatically matches incoming signals with the pre-assigned codes, simplifying operation during movement.
3Ease of operation
If omnidirectional antennas are used for signal acquisition, then ease of operation is improved, but directionality and signal strength are reduced
Solution Approach 1:
The patent merges the advantages of omnidirectional antennas with digital directional coding. The omnidirectional antenna provides 360-degree signal acquisition capability, while the digital code modulation embeds directional information in the signal. The correlation processor at the receiver extracts this directional information, combining the ease of omnidirectional reception with the precision of directional signaling.
Solution Approach 2:
The patent transitions from spatial dimensionality to temporal/codal dimensionality for achieving directionality. Instead of using physical antenna direction (spatial dimension), the system encodes directional information in the temporal and spectral characteristics of modulated codes. This allows omnidirectional antennas to maintain their spatial coverage while the code dimension provides the necessary directional discrimination.
Data Source
AI summary
A method and apparatus for performing direction division multiple access. In some embodiments, the method includes: performing motion compensated correlation upon a received signal transmitted from a transceiver to generate at least one motion compensated correlation result; identifying a direction of arrival for the received signal using the at least one motion compensated correlation result; and selecting, using the direction of arrival of the received signal, to communicate with the transceiver.