Reconfigurable Multi-Antenna Beam Patterns for Unicast and SFN
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Solution Overview
Problem
Current antenna systems in cellular wireless networks lack the ability to be reconfigurable and adjustable to meet the diverse requirements of different transmission types, such as unicast and broadcast, which affects network performance.
Innovation Solution
A multiple-antenna system that can be controlled and reconfigured to produce various radiation beam patterns by managing the signal distribution network, including shaping azimuth patterns and activating specific antenna elements, allowing for different types of transmissions, such as unicast and broadcast, within the same network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed antenna system is used, then the system structure is simple, but it cannot meet the diverse requirements of different transmission types (unicast, broadcast, etc.)
Solution Approach 1:
The antenna system employs dynamic reconfiguration capabilities where antenna elements can be selectively activated or deactivated based on transmission requirements. The system transitions from a static fixed configuration to a dynamic adjustable configuration, allowing the same physical antenna structure to adapt its radiation pattern and coverage area for different transmission types such as unicast and broadcast operations
Solution Approach 2:
The antenna system is designed to perform multiple functions using a single unified structure. By implementing controllable signal distribution networks and adjustable beamforming capabilities, the same antenna array can serve different transmission purposes (unicast to specific users, broadcast to all users, sector-specific transmissions) without requiring separate dedicated antenna systems for each function
2Adaptability or versatility
If the antenna system is made reconfigurable to meet diverse transmission requirements, then adaptability improves, but system complexity increases
Solution Approach 1:
The antenna system is divided into multiple independent controllable elements or sub-arrays. Each antenna element or group of elements can be independently controlled through signal distribution networks, allowing selective activation and individual beamforming. This segmentation enables the complex reconfiguration task to be broken down into manageable independent control units rather than controlling the entire antenna system as a single entity
Solution Approach 2:
The system achieves reconfigurability by changing operational parameters such as signal phase, amplitude, and distribution patterns across different antenna elements. By adjusting these parameters dynamically, the antenna system can transform its radiation characteristics to match different transmission requirements without physical reconfiguration, thereby managing complexity through software-controlled parameter adjustment rather than mechanical changes
3Productivity
If different radiation patterns are generated for different applications, then transmission efficiency improves, but control complexity increases
Solution Approach 1:
Different radiation patterns are generated by changing the phase and amplitude parameters of signals fed to individual antenna elements. The system employs beamforming techniques where parameter adjustments create constructive and destructive interference patterns in space, forming directed beams for unicast transmissions or broader patterns for broadcast. This parameter-based control achieves multiple radiation patterns from a single antenna configuration, improving transmission efficiency while managing control complexity through digital signal processing
Data Source
AI summary
A reception method and apparatus for use in a multi-cell orthogonal frequency division multiple access (OFDMA) wireless system. In a unicast receive mode during a first receive time period, a first group of orthogonal frequency division multiplexing (OFDM) symbols is received by a mobile device from multiple of a plurality of antennas at a serving base station. In a single-frequency-network (SFN) receive mode during a second receive time period, a second group of OFDM symbols is received by the mobile device from one of a plurality of antennas at the serving base station. The transition between the first receive time period and the second receive time period occurs during a cyclic prefix or a cyclic postfix between OFDM symbols, and the plurality of antennas produce a first beam pattern during the unicast receive mode and a second beam pattern during the SFN receive mode.