Radio Message Transmission via Simultaneous Forwarding
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Solution Overview
Problem
In radio communication systems, message forwarding through repeaters often results in poor quality due to distance and channel interference, and existing methods do not effectively utilize channel reciprocity to improve signal quality at the receiver.
Innovation Solution
A method where a transmitter sends a message simultaneously to both the receiver and a forwarding station, with channel estimation and processing to ensure high-quality signal delivery, utilizing channel reciprocity for predistortion and reducing destructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a repeater is used to forward messages over long distances, then the communication range is extended, but the signal quality deteriorates due to distance and channel interference
Solution Approach 1:
The patent combines the direct transmission path (transmitter to receiver) with the relay transmission path (transmitter to repeater to receiver) into a unified MIMO system. Both paths transmit the same message simultaneously, and the receiver combines the signals from both paths, effectively merging two transmission channels to improve signal quality while extending communication range.
Solution Approach 2:
The transmitter sends identical copies of the message through two different paths: one directly to the receiver and another through the repeater. The receiver receives both copies and combines them using MIMO techniques, leveraging the redundancy to combat channel interference and improve reliability.
2Reliability
If channel estimation is performed at the receiver for repeater forwarding, then signal quality can be optimized, but the system complexity and processing requirements increase
Solution Approach 1:
The transmitter performs channel estimation and predistortion processing itself, using the known channel characteristics and the principle of channel reciprocity. This shifts the processing burden from the receiver to the transmitter, simplifying the receiver's task while maintaining optimal signal quality through sophisticated preprocessing at the transmitter side.
Solution Approach 2:
The transmitter performs channel estimation and predistortion in advance before transmission. By pre-processing the signals with predistortion based on estimated channel conditions, the transmitter compensates for expected channel effects beforehand, reducing the need for complex real-time processing at the receiver.
3Reliability
If simultaneous transmission from transmitter and repeater is implemented, then signal redundancy and quality improve, but destructive interference between signals may occur
Solution Approach 1:
The transmitter applies predistortion to the signals before transmission, pre-compensating for the channel effects and potential interference. By inverting the expected channel response in advance, the signals are pre-adjusted to counteract the harmful interference that would otherwise occur during simultaneous transmission through different paths.
Data Source
AI summary
A method transmits a message by radio from a transmitter to a receiver. In a first step, the transmitter transmits the message to a forwarding station. In a second step, the message is subsequently transmitted at the same time from the transmitter and the forwarding station to the receiver. A transmitter carries out the method.