Signal Combining Phases for Constant-Envelope Transmission
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Solution Overview
Problem
Current methods for combining multiple sequences of bits on a carrier signal for transmission reduce power efficiency due to the modulation of the carrier tone, and existing search processes require excessive time and resources to optimize phase values for constant-envelope transmission.
Innovation Solution
A method and apparatus that utilize a search process and component code generator to identify phase values for producing a transmission with a constant envelope, defining all possible combinations of component codes, desired powers, and intercode phases, while reducing the number of variables searched and using penalty factors to evaluate an objective function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a search process is used to optimize phase values for constant-envelope transmission, then power efficiency is improved, but the time and computational resources required increase excessively
Solution Approach 1:
The search space for phase values is segmented into discrete candidate values rather than searching continuously. The component codes are divided into multiple sequences that can be independently optimized. This segmentation allows the optimization problem to be broken into manageable parts that can be solved more efficiently.
Solution Approach 2:
Candidate phase values are pre-calculated and stored in a lookup table before the actual transmission occurs. The component codes and their corresponding phase relationships are predetermined based on the desired power efficiency requirements. During transmission, the system simply selects from these pre-computed options rather than performing real-time optimization.
2Use of energy by moving object
If all possible combinations of component codes for phases are defined to achieve constant envelope transmission, then transmission power efficiency is improved, but the complexity of the system increases
Solution Approach 1:
All possible combinations of component codes and their corresponding phase values are pre-calculated and stored in a lookup table during system initialization. This preliminary action eliminates the need for complex real-time calculations during transmission, as the system simply retrieves pre-determined phase values from the table based on the current component code combination.
Solution Approach 2:
Instead of storing all detailed information about every possible combination, the system uses a simplified lookup table that contains only the essential phase value mappings. This copying approach stores condensed representations of the optimization results, reducing memory requirements and access complexity while maintaining the ability to achieve constant envelope transmission.
Data Source
AI summary
A method and apparatus for producing a transmission of constant envelope on a carrier signal. All possible combinations of all component codes for phases for producing the transmission are defined. Desired component code powers and desired intercode phases between all pairs of component codes are also defined. Still further, a portion of variables of a search process to reduce a number of variables searched by the search process is defined. Even further, deltas and weight variations for standard differences in a Jacobian matrix for use in the search process are defined. Penalty factors to evaluate an objective function of the search process are also defined. The search process is performed.