Digital TV Receiver Beam-Forming for Multi-Path Noise Reduction
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Solution Overview
Problem
Conventional digital TV receivers experience signal noise due to multi-path effects from buildings, walls, and clouds, which degrade the quality of received digital TV signals.
Innovation Solution
A digital TV receiver employing beam-forming devices and channel estimation to select and enhance the main path signal, combining it with demodulated signals to remove multi-path interference, using space diversity and adaptive weight control to improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional digital TV receivers are used, then the receiver structure is simple, but multi-path signal noise degrades signal quality
Solution Approach 1:
The receiver divides the received signal into multiple paths and processes each path separately through individual beam-formers, then combines the processed signals. This segmentation allows targeted suppression of multi-path noise while maintaining manageable complexity through modular architecture.
Solution Approach 2:
The patent introduces channel estimators and equalizers as intermediary components between the antenna array and the signal output. These intermediaries estimate the channel characteristics and compensate for multi-path effects, effectively reducing signal noise without requiring complete redesign of the entire receiver system.
2Reliability
If beam-forming and channel estimation are implemented, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent employs adaptive beam-forming where the weights of the beam-formers are dynamically adjusted based on channel estimation results. This dynamic adaptation allows the system to optimize signal reception quality for varying channel conditions without requiring a fixed complex structure for all possible scenarios.
Solution Approach 2:
The system implements feedback through channel estimators that continuously monitor the received signals and provide information to the beam-formers and equalizers. This feedback mechanism enables the receivers to automatically adjust their parameters to maintain optimal signal-to-noise ratio, improving reliability without requiring manual intervention or overly complex fixed structures.
3Object-affected harmful factors
If multiple antennas and beam-formers are used, then multi-path interference is reduced, but processing time increases
Solution Approach 1:
The patent performs channel estimation using training sequences embedded in the transmitted signal before processing the actual data. This preliminary action allows the system to pre-compute channel characteristics and configure the beam-formers and equalizers in advance, reducing the processing time required for the main data transmission without compromising multi-path interference reduction.
Data Source
AI summary
A receiver that receives radio signals, and a method for the same. The radio signals may be received by a plurality of antennas and then demodulated by respective converter devices, an estimated channel device estimates a channel for at least one antenna and at least one beam-forming device performs beam-forming on a selected main path signal from among the demodulated incident data signals. The output signals from the at least one beam-forming device are combined. The method of receiving the incident data signals may be accomplished by using space diversity.