Adaptive Beamforming for Multi-User Wireless Data Rates
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Solution Overview
Problem
Current WirelessHD technologies face limitations in achieving enhanced wireless speeds and supporting multiple users simultaneously due to constraints in channel quality management and beam steering, particularly in environments with obstacles.
Innovation Solution
The implementation of an adaptive beam-forming system using a transmitter with a phased array antenna and a processor that controls transmission parameters based on feedback from a receiver, allowing for multiple spatial beams and pre-coding of data packets to optimize transmission quality and adapt to changing environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single directional beam is used for transmission, then the data transmission rate is high, but the system cannot support multiple users simultaneously
Solution Approach 1:
The patent segments the transmission beam into multiple spatial beams using beamforming technology. Each spatial beam can be independently directed toward different users or receivers, allowing simultaneous service to multiple users while maintaining high data rates through spatial multiplexing
Solution Approach 2:
The patent introduces spatial dimensionality to the transmission system by utilizing multiple antennas and creating beams in different spatial directions. This transforms a single-dimensional point-to-point link into a multi-dimensional spatial multiplexing system, enabling multiple users to be served simultaneously through spatial separation
2Reliability
If beam steering is implemented to overcome obstacles, then the connection reliability is improved, but the system complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where receivers send channel quality indicators and beam selection feedback to transmitters. This enables adaptive beamforming and automatic beam steering without complex centralized control, improving connection reliability through real-time channel adaptation while managing system complexity through distributed decision-making
Solution Approach 2:
The patent performs preliminary beam training and channel estimation before actual data transmission. This preliminary action establishes optimal beam directions and pre-coding matrices, ensuring reliable connections from the outset and reducing the need for complex real-time adjustments during data transmission
3Adaptability or versatility
If multiple spatial beams are transmitted simultaneously, then multiple users can be supported, but the channel quality management becomes more difficult
Solution Approach 1:
The patent applies local quality optimization by determining separate pre-coding matrices and beamforming weights for each spatial beam and user. This allows channel quality to be optimized independently for each user's specific spatial channel conditions, enabling multi-user support while managing complexity through localized rather than global optimization
Data Source
AI summary
Enhanced wireless speeds are obtained using multiple transmission beams. In one example a transmitter sends data packets through an antenna array using multiple spatial beams and a plurality of analog converters. A receiver receives feedback from a remote station, the feedback including a quality measure of data packets received from the transmitter. A processor to controls transmission parameters of the transmitter using the feedback, the processor having a plurality of states, in a first channel analysis state, the processor determining a beam-forming vector for the antenna array, in a second beam search and training state, the processor determining pre-coding coefficients for the data packets, and in a third high rate transmission state, the processor providing pre-coded data packets to the transmitter for transmission, wherein the processor transitions from the third state to the first state upon receiving a reduced quality measure from the remote station.