UWB Transceiver Code Segmentation for Interference Reduction
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Solution Overview
Problem
Current ultra-wideband (UWB) communication systems have limited channel capacity and number of independent channels, leading to potential interference and inefficiencies in co-located networks.
Innovation Solution
The method involves selecting unique pCodes, comprising predefined modulation codes and spreading factors, for each UWB transceiver network, allowing for simultaneous operation and switching between different pCodes to create unique symbol lengths, thereby increasing channel capacity and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multiple UWB transceiver networks operate in the same location using conventional codes, then network coverage is provided, but cross-network interference occurs and channel capacity is limited
Solution Approach 1:
The invention segments the UWB code space by combining multiple predefined modulation codes (from IEEE 802.15.4 standard) with multiple spreading factors. This creates a segmented code structure where each network is assigned a unique combination of modulation code and spreading factor, effectively dividing the communication space to reduce interference while maintaining system capacity.
Solution Approach 2:
The invention introduces dynamic code assignment where networks can switch between different pCode combinations (modulation code + spreading factor pairs) based on channel conditions and interference levels. This dynamic adaptation allows networks to optimize performance by selecting appropriate code combinations, increasing overall system versatility while managing interference.
2Device complexity
If a limited set of preamble codes is used in UWB networks, then device complexity is reduced, but the number of independent channels is limited
Solution Approach 1:
The invention adds an additional dimension to the code space by combining two independent parameters: modulation codes (time-domain structure) and spreading factors (frequency-domain expansion). This dimensional expansion creates many more unique code combinations without requiring entirely new code designs, thereby increasing the number of independent channels while keeping individual code structures relatively simple.
3Object-affected harmful factors
If unique pCodes with different symbol lengths are assigned to each network, then cross-network interference is minimized, but code assignment complexity increases
Solution Approach 1:
The invention employs preliminary action through pre-defined modulation codes from the IEEE 802.15.4 standard and pre-established spreading factor sets. By preparing these code components in advance and creating a structured combination framework, the system reduces the complexity of real-time code assignment while ensuring unique symbol lengths and minimizing interference.
Data Source
AI summary
An ultra-wideband communication and/or location system having a plurality of channels, each implementing a respective one of a plurality of predetermined codewords. Within each channel, one or more predetermined pulse repetition frequencies are defined. Within a single UWB system, more than two networks of transceivers may be co-located without mutual interference if each is assigned a unique combination of codewords and spreading factors.