WDCT Frame Structure Bit Width Reduction for Wireless Data Transmission
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Solution Overview
Problem
Conventional WDCT wireless communication systems have limited data carrying capacity, restricting their use in applications requiring higher bandwidth, such as multimedia, due to their raw data transmission rate of 32 kilobits per second, which is inadequate for modern RF environments with increased interference.
Innovation Solution
The system enhances data transmission by reducing the bit width to 0.86 μs, allowing for multiple redundant voice and non-voice data fields within standard-duration transmission slots, incorporating forward error correction, and employing an enhanced double extended slot structure to transmit data packets three times, thereby increasing the data transmission rate and resilience against interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional WDCT frame structure is used, then voice communication quality is maintained, but data transmission rate is limited to 32 kbps
Solution Approach 1:
The transmission slot is segmented into multiple sub-slots, allowing voice data to be transmitted across different segments while maintaining quality. This segmentation enables parallel data transmission paths that increase overall throughput without compromising voice communication reliability.
Solution Approach 2:
The patent introduces an additional time dimension by transmitting data across multiple frames and slots. Instead of relying on a single transmission path, data is distributed across multiple temporal dimensions, effectively increasing the data transmission rate while maintaining voice quality through redundant transmission paths.
2Productivity
If bit width is reduced to 0.86 μs, then data transmission rate increases, but frame structure complexity increases
Solution Approach 1:
The patent changes the bit width parameter from conventional values to 0.86 μs, which directly increases the data transmission rate. This parameter change is implemented within the existing TDMA framework, allowing higher throughput while managing complexity through systematic reconfiguration of frame and slot parameters.
Solution Approach 2:
The enhanced frame structure is designed to be multi-functional, supporting both voice and data transmissions simultaneously. The same frame structure accommodates different data types and transmission rates, reducing the need for separate specialized structures and thereby managing complexity while maintaining high productivity.
3Reliability
If multiple redundant data fields are added, then resilience against interference improves, but bandwidth utilization decreases
Solution Approach 1:
Redundant data fields are transmitted in advance across multiple frames and slots before the receiver needs them for error correction. This preliminary transmission of redundant information ensures that if interference occurs, the receiver already has backup data available, improving resilience without requiring retransmissions that would waste bandwidth.
Solution Approach 2:
The patent uses copying by transmitting multiple identical copies of data across different frames and slots. These copies serve as redundancy against interference, and the copying is efficiently implemented within the TDMA structure to maintain good bandwidth utilization while significantly improving reliability.
4Reliability
If forward error correction is incorporated, then transmission reliability improves, but data field duration increases
Solution Approach 1:
Forward error correction is implemented by segmenting the data field into smaller units distributed across multiple slots and frames. This segmentation allows error correction to be applied to individual segments rather than requiring the entire data field to be transmitted continuously, thereby improving reliability without proportionally increasing the total duration.
Solution Approach 2:
The patent maintains continuity of useful action by overlapping error correction transmissions with data transmissions across multiple frames. Instead of adding sequential error correction steps that would extend total duration, the error correction is integrated into the continuous transmission flow, improving reliability while minimizing additional time overhead.
Data Source
AI summary
A system and method for improved data transmission in a WDCT frame structure. A transmission slot in a WDCT frame of conventional size is configured for transmission of data bits having substantially smaller data bit width than used in conventional WDCT frames. A user data field is configured to transmit a larger data payload by including more bits within the user data field. In one implementation, the user data field is configured for transmission of multiple copies of a voice data packet at the same rate as single data packets are transmitted in a conventional WDCT frame structure. In another implementation, a non-voice data transmission rate is increased by more than a factor of two over conventional WDCT frame structure.