Vector-Based Walsh Code Sequence Generator Architecture
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Solution Overview
Problem
Existing Direct Sequence Spread Spectrum (DSSS) communication systems lack flexibility in generating Walsh code sequences, as they are typically limited to a single or few modes of operation and cannot efficiently accommodate varying Walsh coding schemes across different networks, requiring a method for efficient and modular Walsh code generation adaptable to any random length and number of bits.
Innovation Solution
A circuit architecture that utilizes an X by X Walsh matrix, where X is a power of 2, to generate any Walsh code length and output vector size, using multiplexers and logic circuits to select and invert sequences within a single clock cycle, minimizing hardware requirements and allowing variable bit provision per access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional Walsh code generation methods are used, then the system can generate fixed-length Walsh codes, but the system lacks flexibility to accommodate varying Walsh coding schemes across different networks and modes
Solution Approach 1:
The patent implements a universal Walsh code generation apparatus that can generate Walsh codes of any length (64, 128, 256, 512 bits) and provide any number of bits per access (1, 2, 4, 8 bits) through a single hardware structure. This is achieved by using configurable parameters (N for code length, M for bits per access) that allow the same hardware to adapt to different network standards and operational modes without requiring separate dedicated circuits for each mode, thereby resolving the contradiction between versatility and complexity.
Solution Approach 2:
The patent employs dynamic configuration capabilities where the Walsh code generation parameters (code length N and bits per access M) can be changed on-the-fly through control signals. The system uses dynamic selection logic and configurable counters that can be programmed to generate different Walsh code sequences and provide variable bit depths per access cycle, enabling the system to adapt to varying requirements of different networks and modes without physical reconfiguration, thus achieving flexibility without proportionally increasing hardware complexity.
2Productivity
If the system provides a fixed number of sequence bits per access, then the hardware interface is simplified, but the number of requests per time interval increases
Solution Approach 1:
The patent implements a dynamic bit-provision interface where the number of bits provided per access (M) can be configured based on the specific requirements of the requesting component. The system uses a configurable counter and selection logic that can provide 1, 2, 4, or 8 bits per access cycle, allowing the interface to optimize the balance between throughput efficiency and request frequency. This dynamic capability enables the system to reduce the number of requests per time interval by providing more bits per access when needed, while maintaining interface simplicity through a unified configurable structure rather than multiple dedicated interfaces.
3Adaptability or versatility
If the system generates Walsh codes for multiple modes and networks, then multi-mode operation is enabled, but the hardware resources required increase
Solution Approach 1:
The patent designs a universal Walsh code generation apparatus that serves multiple networks and modes (IS-95, CDMA2000, and other DSSS systems) through a single hardware implementation. The system uses parameterized control where the code length (N) and bits per access (M) can be configured to match different network requirements, eliminating the need for separate dedicated Walsh generators for each standard. This universal approach significantly reduces the quantity of hardware resources required compared to having separate generators for each mode while maintaining full multi-mode operational capability.
Solution Approach 2:
The patent merges the functionality of multiple Walsh code generators into a single integrated apparatus. By combining the generation logic, selection mechanisms, and output interfaces into one unified structure that can be configured for different modes, the system achieves multi-mode operation without requiring proportional increases in hardware resources. The merged design shares common components (such as the Walsh matrix storage, control logic, and output interface) across different operational modes, thereby reducing overall hardware resource consumption while maintaining versatility.
Data Source
AI summary
A vector-based Walsh code sequence generator provides for a general architecture that can be easily adapted to any random length sequence and any random number of bits per access. The Walsh code sequence generator can produce a new access on every hardware clock cycle, thereby maximizing the efficiency of the bit sequence requesting process.