Wireless Lighting Transmitter Signal Interference Reduction
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Solution Overview
Problem
The efficiency and responsiveness of wireless lighting control systems in commercial and industrial settings drop dramatically when many lights operate on a secure network, due to interference and difficulty in accessing and cabling existing lighting systems, especially in hard-to-reach locations like warehouse ceilings.
Innovation Solution
A wireless lighting system comprising a transmitter with a presence detector, memory, and radio transmitter that repeats signals with a random interval to reduce interference, and a receiver that learns typical usage patterns to adjust light duration and ignores conflicting 'OFF' signals, allowing lights to stay on as long as any valid activation remains, with optional retransmission and override features for improved coverage and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wireless lighting control system is implemented in commercial and industrial premises, then the complexity of installation and cabling is reduced, but the efficiency and responsiveness of the system drops dramatically when many lights operate on a secure network due to signal interference
Solution Approach 1:
The transmitter repeats the wireless signal at intervals to ensure reliable delivery through interfered channels. The receiver is configured to respond to repeated signals within a specified time window, maintaining system responsiveness despite signal interference in dense wireless environments.
Solution Approach 2:
The system implements acknowledgment feedback where receivers confirm receipt of signals to the transmitter. This feedback mechanism ensures reliable communication over the wireless medium by allowing the transmitter to verify successful signal delivery and retransmit if necessary, maintaining efficiency despite interference.
2Ease of operation
If a wireless lighting control system is implemented in hard-to-reach locations like warehouse ceilings, then cabling difficulty is reduced, but signal interference increases and system responsiveness decreases
Solution Approach 1:
The transmitter repeats the wireless signal multiple times at defined intervals. This periodic transmission increases the probability that at least one signal copy will be successfully received despite interference from wireless devices commonly found in warehouse environments, thereby improving signal reliability without requiring physical cabling.
Solution Approach 2:
The system anticipates potential signal loss by implementing redundant signal transmissions before the communication window closes. The receiver is pre-configured to accept repeated signals within a specified time window, cushioning against the effects of interference before it can cause complete communication failure.
3Adaptability or versatility
If multiple transmitters share a common network to control many lights, then system coverage is improved, but interference increases and efficiency drops
Solution Approach 1:
The system segments the wireless communication by assigning unique identifiers to each transmitter-receiver pair. This segmentation allows multiple transmitters to operate on the same network without complete interference, as receivers can distinguish and respond to signals from their designated transmitters, maintaining system efficiency while providing broad coverage.
Solution Approach 2:
Acknowledgment feedback mechanisms allow receivers to confirm signal receipt to specific transmitters. This feedback enables efficient coordination among multiple transmitters sharing the network, reducing redundant transmissions and energy waste while maintaining comprehensive system coverage through selective communication.
Data Source
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AI summary
A transmitter for a wireless lighting system comprises an input for receiving an activation signal from a presence detector or alternatively from a light sensor, a memory arranged in operation to store a transmitter ID, and a radio transmitter; and in response to a first activation signal from the presence detector, the transmitter is arranged in operation to transmit a wireless signal comprising the transmitter ID and data indicating a length of time T for which a recipient light should turn on in response to the wireless signal, or alternatively in response to a signal from the light detector indicating sufficient light from another source, that a recipient light should remain off. Meanwhile, a receiver for the wireless lighting system comprises an output for sending a control signal to a light, a memory arranged in operation to store one or more transmitter IDs of transmitters with which the receiver has been associated, a timer and a radio receiver; and in response to receiving a wireless signal comprising a transmitter ID and data indicating a length of time T, the receiver is operable to compare the received transmitter ID with the or each stored transmitter ID, and in the event of a match is operable to output one or more control signals to indicate that a light should turn on for the indicated length of time T, optionally unless it has received a signal to remain off due to the presence of sufficient light.