Single RF Chain Receiver Orthogonal Beam Multiplexing
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Solution Overview
Problem
Existing multiplexing and diversity reception schemes using a single RF chain suffer from spectrum spreading and adjacent channel interference due to beam pattern switching or rotation within one symbol duration, leading to degraded signal-to-noise ratio (SNR) performance.
Innovation Solution
A receiving device and method that radiates orthogonal beam patterns using a single RF chain, with a beam pattern controller adjusting the beam patterns at the start of each time slot and a signal component extracting unit using a look-up table and correlator to extract signal components, allowing for multiplexing and diversity gains without beam pattern switching or rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam pattern switching or rotation is performed within one symbol duration to achieve multiplexing and diversity reception, then multiplexing gain and diversity gain are obtained, but spectrum spreading occurs causing adjacent channel interference and degraded SNR performance
Solution Approach 1:
The patent segments the beam pattern switching operation by restricting it to occur only at the boundary between symbols (i.e., at the start of each symbol period) rather than continuously within a symbol duration. This temporal segmentation prevents spectrum spreading while still enabling multiple beam patterns to be used across different symbols, thus maintaining multiplexing gain without causing adjacent channel interference.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the beam pattern at the start of each symbol period before the actual signal transmission begins. The beam pattern is set in advance based on code values allocated to different beam patterns, allowing the system to prepare the antenna configuration before the symbol starts, thereby avoiding mid-symbol changes that would cause spectrum spreading.
2Productivity
If beam pattern is switched or rotated within one symbol duration to achieve multiplexing, then multiplexing gain is obtained, but average power of received signal in each beam pattern is reduced degrading SNR
Solution Approach 1:
The patent segments the multiplexing operation across multiple symbol periods rather than within a single symbol. By assigning different beam patterns to different symbol periods and using code values to multiplex signals across time slots, the system maintains sufficient average power in each beam pattern while still achieving multiplexing gain through temporal separation.
Solution Approach 2:
The patent employs periodic action by repeating the beam pattern switching at the boundary of each symbol period rather than continuously within a symbol. This periodic switching at symbol boundaries allows the system to maintain stable beam patterns during each symbol duration, ensuring consistent signal power and SNR performance while still enabling multiplexing across different periods.
Data Source
AI summary
A receiving device and method using a single RF chain includes a reception antenna module radiating a plurality of orthogonal beam patterns to receive a signal, a single RF chain processing a reception signal from the reception antenna module, a signal component extracting unit extracting a reception signal component corresponding to each beam pattern using the reception signal received through the reception antenna module and the single RF chain and a code value previously allocated to the plurality of beam patterns, and a beam pattern controller controlling a beam pattern radiated by the reception antenna module.