Composite PN Code Generation via Phase Segmentation
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Solution Overview
Problem
In complex spread spectrum communication systems, acquiring lost PN sequence timing is time-consuming, and existing technologies struggle to efficiently generate multiple independent PN code phases, which is critical for maintaining synchronization and switching between codes in CDMA networks.
Innovation Solution
A Phase Division Multiple Access (PDMA) system and method that generate multiple composite PN codes by using a common set of relatively prime component PN codes with controlled phase offsets, allowing for rapid switching between code phases and maintaining synchronization across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional PN code generation methods are used in complex spread spectrum systems, then multiple independent PN code phases can be generated, but the time required to acquire lost PN sequence timing and switch between codes becomes excessively long
Solution Approach 1:
The patent segments the PN code generation process by using multiple independent PN code generators, each producing a separate PN code sequence. These segmented code sequences are then combined through logical operations to form composite PN codes with distinct phases. This segmentation allows the system to maintain multiple code phases simultaneously without requiring sequential generation, thereby reducing acquisition time while managing complexity through modular architecture.
Solution Approach 2:
The system performs preliminary action by pre-generating and storing multiple PN code phases in memory before they are needed for communication. The PN code generators continuously produce code sequences that are stored and ready for rapid retrieval and switching. This preliminary preparation eliminates the need for time-consuming real-time generation and acquisition during actual communication operations.
2Speed
If multiple independent PN code phases are generated using traditional methods, then code switching capability is provided, but the switching speed between codes is slow and latency increases
Solution Approach 1:
The patent merges multiple PN code sequences generated by independent generators into composite codes through logical combination operations. By combining multiple code sequences that are already generated and synchronized, the system achieves rapid switching capability without the latency associated with sequential generation methods. The merging process creates functionally independent codes that can be switched between instantly.
Solution Approach 2:
Multiple PN code phases are preliminarily generated and held in ready state by independent generators before switching is required. This preliminary generation ensures that all necessary code phases are pre-computed and available in memory, enabling instantaneous switching without generation delays during actual code transitions.
3Adaptability or versatility
If a common PN code is used across the network, then synchronization is simplified, but the ability to provide functionally independent codes for multiple users is limited
Solution Approach 1:
The patent implements universality by designing a system where a common set of hardware resources (PN code generators and combination logic) serves multiple functions by generating multiple functionally independent composite PN codes. The same hardware infrastructure that generates one composite code can be reconfigured or combined differently to produce additional independent codes, allowing one system to fulfill multiple user requirements simultaneously.
Solution Approach 2:
The system segments the composite code generation process into independent component PN code sequences that can be selectively combined. Each segment (individual PN code generator) operates independently but contributes to the formation of multiple composite codes through logical combination. This segmentation enables the system to provide functionally independent codes to multiple users while using a segmented, modular hardware architecture.
Data Source
AI summary
A phase division multiple access (PDMA) system is provided. The PDMA system includes at least one receiver logic combiner adapted to generate a plurality of composite PN codes. Each of the plurality of composite PN codes are derived from a common composite PN code and are separated by a predetermined PN phase.