TDMA Transceiver Guard-Time Reduction via Offset Synchronization
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Solution Overview
Problem
In TDMA schemes, delays and channel bandwidth inefficiencies arise due to varying transmission paths, clock jitter, and the use of serialisers/deserialisers, leading to longer guard-times and reduced data transmission granularity.
Innovation Solution
A method that involves determining an offset time between the sender and receiver clocks, allowing for fine control of guard-times by synchronizing data transmission within time-slots, and using barrel-shifting to align word boundaries, enabling data transmission even when the time remaining is not sufficient for complete word transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard-times are inserted to avoid overlap between consecutive time-slots in TDMA scheme, then collision between senders is avoided, but channel bandwidth is lost because the channel may not be used during guard-times
Solution Approach 1:
The patent dynamically adjusts the guard-time parameter based on actual transmission conditions. By monitoring the arrival time of data packets at the receiver and calculating the actual guard-time needed, the system optimizes the guard-time duration to be just sufficient to prevent collisions while minimizing bandwidth waste. This is achieved through the receiver determining offset times and communicating them back to senders, allowing precise control of guard-time intervals.
2Productivity
If serialisers/deserialisers are used to transform parallel data stream to serial data stream at high baud rate, then processing of high transmission protocol layers can be performed at lower baud rate, but transmission time shows coarse granularity because transmission may only be interrupted when all input bits have been sent
Solution Approach 1:
The patent segments the data transmission into smaller units that can be controlled at finer time intervals. Instead of treating entire words as atomic transmission units, the system divides transmission into smaller controllable segments, allowing interruption and resumption at more granular time points. This is achieved by implementing fine-grained control mechanisms that can stop and restart transmission within word boundaries, enabling more precise control over transmission timing and reducing idle time.
3Productivity
If increasing transmission data rate is implemented to accommodate more subscribers, then high baud rates up to tens of gigabits per second are achieved, but circuit design becomes difficult and power consumption increases
Solution Approach 1:
The patent transitions from time-domain optimization to a combined time-frequency domain approach. By implementing offset time communication and fine-grained control mechanisms, the system achieves efficient spectrum utilization without requiring proportionally higher transmission rates. This dimensional shift allows the system to accommodate more subscribers through better resource allocation and coordination rather than simply increasing baud rate, thereby reducing the complexity and power consumption associated with ultra-high-speed circuits.
Data Source
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AI summary
A method of transmitting and receiving serial data over a communication link such as an optical fibre in a time-division multiple access (TDMA) scheme and a transceiver using said method of transmitting and receiving data. On the receiver side, an offset time between reception time of a synchronisation signal and a word boundary is determined and transmitted to the sender. The sender receives parallel input data and is adapted to send the parallel input data over a serial link. In order to reduce guard-times between timeslots, the sender is muted at a last word transmission end time, the last word transmission end time being a word transmission time minus the offset time after a start time of the last word transmission.