Golay Code Generation With Seed Vectors for Multi-Piconet UWB
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Solution Overview
Problem
Existing UWB communication systems face challenges in achieving optimal autocorrelation and cross-correlation properties for multiple-access codes, leading to interference issues and limited configurability for different piconets and data rates, while also requiring simple and adaptable transmitter and receiver structures.
Innovation Solution
A Golay-code generator is developed, utilizing a delay means and adaptable seed-vector insertion to produce Golay complementary code pairs, which can be configured for various piconets and data rates, and integrated into spreading and matched-filter components to reduce interference and support flexible code lengths and Quality of Service levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If orthogonalizing codes with low cross-correlations are selected to reduce MAI and ISI, then interference between multiple users is minimized, but it becomes difficult to achieve both low cross-correlation and low aperiodic autocorrelation simultaneously
Solution Approach 1:
The patent implements dynamic code generation where the spreading code is constructed by modulating a base Golay code with a piconet-specific identifier. This allows the system to adaptively generate unique codes for each piconet while maintaining the optimal autocorrelation and cross-correlation properties of the underlying Golay code structure, thereby achieving both low interference and high configurability
Solution Approach 2:
The patent changes the parameter of the spreading code by using different piconet identifiers to modulate the same Golay code base. This parameter variation allows multiple piconets to operate simultaneously with distinct codes while preserving the mathematical properties that minimize MAI and ISI, resolving the contradiction between code configurability and interference reduction
2Reliability
If distinctive multiple-access codes with suitable autocorrelation and cross-correlation properties are used to minimize decoding errors, then communication reliability is improved, but the system complexity increases due to the need for optimal code selection and management
Solution Approach 1:
The patent segments the code management function into two parts: a fixed Golay code base that provides optimal autocorrelation properties, and a variable piconet identifier that provides uniqueness. This segmentation simplifies code management by eliminating the need to search for and manage entirely distinct codes for each piconet, while still maintaining decoding accuracy through the preserved mathematical properties of the Golay code structure
Solution Approach 2:
The patent makes the Golay code base universal across all piconets, serving as a common foundation that provides the desired autocorrelation and cross-correlation properties. Each piconet simply applies its unique identifier to this universal base, reducing code management complexity while maintaining reliability through the consistent mathematical properties of the underlying code structure
3Ease of manufacture
If simple transmitter and receiver structures are used, then ease of manufacture and operation are improved, but the ability to support multiple piconets and configurable data rates is reduced
Solution Approach 1:
The patent introduces dynamic configurability through the piconet identifier parameter, allowing the same simple transmitter structure to support multiple piconets and data rates. The underlying Golay code processing remains simple and fixed, while the modular piconet identifier provides the necessary adaptability without increasing structural complexity
Solution Approach 2:
The patent achieves versatility through parameter changes rather than structural changes. By varying the piconet identifier parameter, the system can support multiple piconets and configurable data rates while maintaining the same simple transmitter and receiver structures, thus resolving the contradiction between simplicity and adaptability
Data Source
AI summary
A Golay-code generator configured for generating Golay complementary code pairs comprises a sequence of delay elements configured for providing a predetermined set of fixed delays to at least a first input signal and a sequence of adaptable seed vector insertion elements configured for multiplying at least a second input signal by a variable seed vector, wherein each of a plurality of seed vectors corresponds to at least one predetermined piconet. The Golay-code generator may further comprise multiplexers configured for switching inputs and outputs of at least two delay elements in the sequence of delay elements to produce a plurality of compatible delay vectors. The Golay-code generator may further comprise a code-truncation module configured to shorten the Golay complementary code pairs for producing a plurality of daughter codes.