Signal Reception Method Using Weighting Coefficients for Transmitter Identification
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Solution Overview
Problem
In wireless transmission systems with multiple transmitters broadcasting the same data synchronously at the same frequency, receivers struggle to identify the specific transmitter, leading to complications in design and functionality, particularly in shadow zones where additional non-SFN signals are required to provide identification information.
Innovation Solution
A method where transmitters in subsets apply different complex weighting coefficients to their signals over specific time intervals, allowing receivers to determine the contribution and position of each subset or transmitter, enabling identification and improving signal reception by varying the weighting coefficients to optimize signal mixing and power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple transmitters transmit synchronously at the same frequency using SFN technique, then broadcast coverage is improved and shadow zones are covered, but the receiver cannot identify the specific transmitter
Solution Approach 1:
The patent applies periodic action by assigning different complex weighting coefficients to transmitters in different time intervals. Each transmitter transmits the same data signal but with time-varying weighting coefficients that create distinct signal patterns. The receiver uses these periodic variations to identify which transmitters are active and their locations, while maintaining the SFN benefit of continuous coverage.
2Loss of information
If an additional non-SFN signal is transmitted to provide transmitter identification, then transmitter identification is enabled, but the design complexity of transmitters and receivers increases
Solution Approach 1:
The patent merges the data transmission function with the identification function by encoding transmitter identification information within the same data signal through complex weighting coefficients. Instead of transmitting separate identification signals, the system combines identification data with the main broadcast data, allowing receivers to identify transmitters while processing the regular data signal, thus avoiding additional hardware complexity.
Solution Approach 2:
The patent changes the parameters of the transmitted signal by applying complex weighting coefficients that vary over time. These parameter changes encode transmitter identification information within the signal characteristics themselves, allowing the receiver to extract identification data from the signal parameters without requiring separate identification channels or additional signal processing hardware.
3Measurement precision
If different complex weighting coefficients are applied to different transmitter subsets over time intervals, then transmitter identification and differentiation are enabled, but the signal processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-assigning different complex weighting coefficients to different transmitters before transmission. The weighting patterns are predetermined and known to both transmitters and receivers, allowing the receiver to use these known patterns to identify transmitters through correlation or matching processes, rather than requiring complex real-time analysis of signal characteristics.
Data Source
AI summary
The invention relates to a method for the reception of a signal by a receiver, a received signal comprising a combination of signals transmitted by a plurality of transmitters synchronously, at a same frequency and representative of the same data encoded with a same first encoder. In order to identify simply a transmitter, the method comprises: - reception (61) of two signals each weighted with a different weighting coefficient and depending on the transmitter, one of the two coefficients taking two different values for two time intervals, the ratios of coefficients for each of the temporal intervals being different, and - determination (62) of a parameter specific to one of the two subsets from the signal received and an information representative of the associated coefficients and time intervals. The invention also relates to the corresponding method for transmitting.