Receiver Signal Separation Using Orthogonal Polarization
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Solution Overview
Problem
Current signal processing technologies lack the capability to effectively differentiate and separate received signals from multiple transmit signals with varying relative amplitudes and phase differences, limiting the ability to simulate different polarization states and beamforming configurations at the receiver side without physical measurements for each condition.
Innovation Solution
A method and system that utilize coherent, separable transmit signals with specific separability characteristics, allowing receivers to identify, isolate, and combine received signals to estimate responses as if transmitted with different amplitude and phase settings, enabling simulated beamforming and polarization control through receiver-side signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transmit signals with different amplitudes and phase differences are transmitted, then polarization control and beamforming capabilities are improved, but signal separation and differentiation at the receiver becomes more difficult
Solution Approach 1:
The transmit signals are segmented into orthogonal frequency-division multiplexing (OFDM) subcarriers, where each subcarrier is assigned a specific polarization state. This segmentation allows the receiver to separate signals based on their frequency and polarization characteristics, resolving the contradiction between maintaining multiple polarization states and enabling signal differentiation.
Solution Approach 2:
Orthogonal polarization states serve as an intermediary mechanism to differentiate between multiple transmit signals. By assigning orthogonal polarizations (e.g., horizontal and vertical) to different signals, the system enables the receiver to distinguish and separate signals that would otherwise be difficult to differentiate, thus resolving the signal separation difficulty while maintaining polarization control versatility.
2Measurement precision
If physical transmitter-side adjustments are made for each polarization state and beamforming configuration, then measurement accuracy is improved, but system complexity and measurement time increase
Solution Approach 1:
The system performs preliminary actions by transmitting reference signals with known orthogonal polarization states before actual measurements. This preliminary transmission establishes a baseline channel response that can be used to synthesize receiver responses for any desired polarization state or beamforming configuration through digital signal processing, eliminating the need for physical reconfiguration of the transmitter for each measurement condition.
Solution Approach 2:
Instead of physically reconfiguring the transmitter for each polarization state and beamforming configuration, the system creates virtual copies of the transmitter responses through digital signal processing. By combining the reference signal measurements with desired beamforming weights and polarization states, the system synthesizes equivalent receiver responses without requiring physical transmitter adjustments, thus reducing system complexity while maintaining measurement accuracy.
3Device complexity
If receiver-side signal processing is used to simulate different transmit configurations, then device complexity is reduced, but the ability to differentiate received signals deteriorates
Solution Approach 1:
The received signal is segmented into components corresponding to different orthogonal polarization states using OFDM processing. This segmentation allows the receiver to separately process and differentiate signals that were transmitted with different polarizations, maintaining signal differentiation capability while enabling flexible virtual transmitter configurations through digital signal processing.
Solution Approach 2:
Orthogonal polarization states act as an intermediary that enables both signal differentiation and virtual transmitter configuration. The receiver uses the orthogonal polarization information to separate and identify different transmit signals, while simultaneously allowing digital processing to synthesize responses for any desired transmit configuration, thus resolving the contradiction between reduced device complexity and maintained signal differentiation capability.
Data Source
AI summary
A multi-port transmitter can synthesize and send a first plurality of transmit signals having a separability characteristic which permits them to be differentiated from one another. A receiver can then detect one or more receiver signals which include one or more combinations of received versions of the first plurality of transmit signals. The receiver may use the separability characteristic to determine the received versions of the first plurality of transmit signals from the one or more receiver signals. Then, the receiver may determine an estimated signal corresponding to the estimated receiver response to a second plurality of virtual transmit signals which comprise a combination of the first plurality of transmit signals. Determining the estimated signal may include forming a combination of the received versions of the first plurality of transmit signals.