UWB Symbol Mapping for Higher Data Rate Without Coding Gain Loss
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Solution Overview
Problem
Existing ultra-wideband (UWB) communication systems have limitations in achieving higher data transmission rates efficiently, leading to suboptimal performance compared to best prior art techniques.
Innovation Solution
The proposed method involves an improved symbol mapper in UWB communication systems that maps each symbol to either m pulses or (m+n) pulses, where n is a power of 2, to increase data transmission rates without compromising coding gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If puncturing is applied to increase bit rate, then data transmission rate is improved, but coding gain is significantly lost
Solution Approach 1:
The invention segments the data transmission process into multiple parallel streams by dividing the coded bits into different groups that can be independently mapped to pulses. This segmentation allows the system to achieve higher data rates through parallel transmission while maintaining the full coding gain of the original convolutional code, avoiding the need for puncturing that would compromise coding performance.
2Productivity
If more chip periods are used per symbol frame, then data transmission rate is limited, but increasing chip periods would improve transmission rate
Solution Approach 1:
The invention introduces dynamic pulse mapping where the number of pulses per symbol is variable rather than fixed. By dynamically adjusting the mapping between coded bits and pulses based on channel conditions and data rate requirements, the system can achieve higher effective data rates without increasing the fixed chip period duration, thus resolving the contradiction between transmission rate and time duration.
3Productivity
If traditional symbol mapping is used, then coding gain is maintained, but data transmission rate is suboptimal
Solution Approach 1:
The invention performs preliminary organization of coded bits into structured groups before the pulse mapping stage. By pre-arranging the coded bit sequences in a systematic pattern that aligns with the available pulse positions, the mapping process becomes more efficient and achieves higher data rates without requiring complex real-time decision-making, thus improving productivity while keeping device complexity manageable.
Data Source
AI summary
An ultra-wideband (UWB) communication system comprising a transmitter and a receiver is disclosed. In one embodiment, a 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.