Soft-Decision Decoder Input Range Adjustment by Frequency Sections
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Solution Overview
Problem
Conventional range adjusters in mobile communication systems face inefficiencies in expressing input bit values, particularly failing to distinguish between frequently occurring values like −10 and −23, and incur increased memory and circuit complexity due to fixed adjustment constants and arithmetic averaging methods.
Innovation Solution
A method and apparatus that divide output bit values into sections, measure their frequencies, and adjust the expression range based on the highest frequency section, mapping unexpressed values to specific values, thereby optimizing the number of output bits without increasing memory capacity or circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed adjustment constant is used in the range adjuster, then the circuit complexity is reduced, but the ability to distinguish frequently occurring values (e.g., -10 and -23) is lost
Solution Approach 1:
The patent implements dynamic adjustment of the expression range by continuously monitoring the frequency of output bit values and adapting the range adjuster's parameters in real-time. This allows the system to transition from a static fixed constant approach to a dynamic adaptive approach, resolving the contradiction between circuit simplicity and measurement precision by only increasing complexity when actually needed based on observed data patterns
Solution Approach 2:
The patent changes the parameters of the range adjuster based on the measured frequency distribution of output bit values. By adjusting the expression range parameters dynamically according to actual operating conditions, the system maintains measurement precision for frequently occurring values while avoiding unnecessary complexity for rare cases
2Measurement precision
If arithmetic averaging method is used to adjust the expression range, then the measurement precision is improved, but the memory capacity and circuit complexity increase
Solution Approach 1:
The patent extracts only the essential information needed for range adjustment by measuring and storing the frequency of output bit values in a simplified manner. Instead of implementing complex arithmetic averaging that requires extensive memory and computation, the system extracts the key statistical property (frequency distribution) and uses this condensed information to drive the range adjustment, thereby maintaining precision while reducing complexity
3Measurement precision
If the number of output bits is increased to express more input bit values, then the measurement precision is improved, but the productivity of the communication system decreases
Solution Approach 1:
The patent dynamically adjusts the number of output bits based on the actual frequency distribution of input bit values. When certain values occur frequently, the system allocates more output bits to represent them with higher precision. When values occur rarely, fewer bits are used. This dynamic allocation resolves the contradiction by optimizing the balance between precision and efficiency based on actual communication patterns rather than using a fixed bit allocation
Data Source
AI summary
An apparatus and method for adjusting a desired expression section according to input bit values in a mobile communication system that expresses only a defined partial section of the input bit values in order to make the number of output bits be less than the number of the input bits, and maps bit values included in unexpressed sections to a specific value is provided. In the apparatus and method, a measurer divides possible output bit values into at least three sections, and measures output frequencies of output bits for the respective sections for a predetermined time. A controller adjusts the desired expression section, when an output frequency for a specific section is greater than output frequencies for other sections.