Segmented Subcarrier Broadcast Using Multiple Antennas
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Solution Overview
Problem
Current wireless communication systems face challenges in broadcasting messages to multiple devices within a coverage area or to devices with unknown locations, as traditional methods either lack beamforming gain or require stringent antenna configuration and calibration.
Innovation Solution
The technique involves segmenting subcarriers of a broadcast message and assigning them to multiple antennas, allowing for simultaneous transmission of spatially separated radio frequency beams without the need for beamforming or complex antenna calibration, using orthogonal frequency division multiple access (OFDMA) techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single antenna is used to broadcast messages, then the radiation pattern spans the entire coverage area, but the broadcast message has significantly less coverage along the radius due to lack of beamforming gain
Solution Approach 1:
The patent segments the broadcast message into multiple parts and transmits each segment through a different antenna. This allows the system to achieve beamforming gain for each directional transmission while collectively covering the entire service area, resolving the contradiction between full-area coverage and beamforming power concentration.
2Area of stationary object
If beam pattern synthesis is used to send broadcast messages, then coverage can be improved, but stringent requirements on antenna array configuration and calibration are imposed
Solution Approach 1:
Instead of using complex beam pattern synthesis, the patent segments the broadcast message and transmits it through multiple antennas independently. This approach achieves coverage improvement without requiring complex antenna array configurations or calibration procedures, thereby reducing device complexity.
Solution Approach 2:
Rather than synthesizing a complex beam pattern across the entire antenna array, the patent inverts the approach by having each antenna transmit a separate segment of the broadcast message. This simplifies the system by eliminating the need for complex beamforming synthesis while achieving similar coverage goals.
3Power
If beamforming is used to transmit messages to particular devices, then received signal power is increased, but the location or spatial signature of the device must be known
Solution Approach 1:
The patent segments the broadcast message and transmits it through multiple antennas without requiring knowledge of the receiving device's location. Each antenna transmits a segment that can be coherently combined at the receiver, achieving high received signal power while maintaining adaptability to unknown device locations.
Data Source
AI summary
Techniques are provided herein to segment subcarriers for broadcast transmission to one or more mobile stations. A broadcast message to be transmitted from a first device is generated. The broadcast message comprises a plurality of symbols and each symbol is to be transmitted at a different one of a plurality of frequency subcarriers. The plurality of subcarriers is divided into groups and each group of subcarriers is assigned to a corresponding one of a plurality of antennas of the first device. The groups of subcarriers are transmitted from corresponding ones of the plurality of antennas.