Weighted Decoding for Single Carrier Block Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In single carrier block transmission systems, decoding characteristics are deteriorated in environments with conspicuous transmission line fluctuations, despite measures to suppress multipath fading.
Innovation Solution
A receiving apparatus that includes a transmission-line estimating unit, a demodulation processing unit, a weight calculating unit, and a decoding unit, which performs transmission line estimation, demodulation, weight calculation, and decoding using transmission line estimation values to improve decoding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If single carrier block transmission is used to suppress peak power, then power efficiency is improved, but decoding characteristics are deteriorated in environments with transmission line fluctuations
Solution Approach 1:
The patent changes the parameter of decoding by introducing weighted decoding that adapts to transmission line conditions. The weight calculation unit computes weights based on transmission line estimation values, and the decoding unit applies these weights to improve decoding performance in fluctuating environments while maintaining the single carrier transmission structure.
2Device complexity
If conventional decoding is used in single carrier transmission, then device complexity is kept low, but decoding reliability is insufficient in multipath fading environments
Solution Approach 1:
The patent segments the decoding process into multiple stages: transmission line estimation, weight calculation based on estimation values, and weighted decoding. This segmentation allows the system to improve reliability through adaptive weighting without requiring a complete redesign of the decoding architecture.
Solution Approach 2:
The patent performs preliminary transmission line estimation and weight calculation before the actual decoding process. This preliminary action provides the decoding unit with optimized weights that account for multipath fading conditions, thereby improving decoding reliability before the final decoding operation.
Data Source
AI summary
A receiving apparatus includes a channel estimating unit that performs channel estimation by using a reception signal and obtains a channel estimation value, a demodulation processing unit that performs demodulation processing by using the channel estimation value and the reception signal, a weight calculating unit that calculates weight for decoding for each of channels by using the channel estimation value, and a decoding unit that performs decoding processing by using the weight and a result of the demodulation processing.