UWB Symbol Mapping for Higher Data Rates Without Coding Gain Loss
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Solution Overview
Problem
Current ultra-wideband (UWB) communication systems face limitations in achieving higher data transmission rates without compromising coding gain and introducing complexity in transmitter and receiver operations.
Innovation Solution
A method and apparatus that utilize a symbol mapper to map symbols to either m pulses or (m÷n) pulses of a packet, bypassing convolutional encoders in certain configurations to achieve higher data transmission rates, while maintaining coding gain and reducing power-per-bit consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If puncturing schemes are used to increase data transmission rate, then productivity is improved, but reliability deteriorates due to loss of coding gain
Solution Approach 1:
The patent changes the mapping parameters between symbols and pulses, allowing flexible configuration of pulses per symbol (m) and puncturing factor (n). By adjusting these parameters, the system can achieve higher data rates while maintaining coding gain through optimized pulse allocation and silent chip placement.
Solution Approach 2:
The system dynamically selects between different transmission modes (first mode and second mode) based on channel conditions and rate requirements. The symbol mapper can adaptively choose to map symbols to m pulses or (m÷n) pulses, providing dynamic adjustment of the trade-off between data rate and coding gain.
2Productivity
If more chip periods are allocated to data transmission, then productivity is improved, but device complexity increases due to additional transmitter and receiver operations
Solution Approach 1:
The patent segments the transmission frame into distinct components: active chip periods for data, guard intervals for separation, and strategically placed silent chip periods. This segmentation allows the system to increase data transmission capacity while maintaining manageable complexity through structured organization of transmission elements.
Solution Approach 2:
The system uses periodic patterns of pulse transmission and silent periods within chip periods. This periodic structure simplifies the transmitter and receiver operations by creating predictable, repeating transmission cycles that are easier to process than arbitrary patterns.
3Reliability
If guard intervals are extended to maintain timing synchronization, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent applies guard intervals and silent periods selectively at specific locations within the transmission frame rather than uniformly throughout. By placing silent chip periods strategically between bursts and at specific chip periods, the system maintains timing synchronization only where necessary, minimizing overall time loss while ensuring reliability at critical synchronization points.
Data Source
AI summary
An ultra-wideband (“UWB”) communication system comprising a transmitter and a receiver. In one embodiment, the symbol mapper circuit in the transmitter is adapted, in a first mode, to develop symbols having the number of pulses as currently defined in the 4z Standard; and, in a second mode, to develop symbols having fewer pulses than as currently defined in the 4z Standard. In an optional third mode, each data bit is mapped to a single pulse.