Reception Quality Estimation for Higher-Order Modulation Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bit error rate estimating apparatuses cannot detect bit errors remaining after error correction decoding, which hinders adaptive modulation control and coding rate adjustments in wireless communication systems, leading to suboptimal communication quality when increasing the M-ary number or coding rate.
Innovation Solution
A received signal quality estimating apparatus that generates quality characteristics from a demodulated signal using a different communication scheme, allowing for pseudo estimation of residual bit errors after decoding, enabling adaptive control of communication schemes based on estimated error states without changing the current scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the M-ary number or coding rate is increased to improve transmission efficiency, then productivity increases, but reliability deteriorates due to undetected residual bit errors
Solution Approach 1:
The invention performs preliminary estimation of residual bit errors before actually increasing the M-ary number or coding rate. By using the pseudo residual bit error estimating section to predict error rates in advance, the system can make informed decisions about whether to switch to higher efficiency communication schemes, thus preventing reliability deterioration while maintaining productivity improvements.
2Device complexity
If conventional bit error rate estimating apparatus is used, then device complexity is low, but measurement precision deteriorates because it cannot detect residual bit errors after decoding
Solution Approach 1:
The invention introduces a pseudo residual bit error estimating section that acts as an intermediary between the conventional error detection mechanism and the adaptive modulation control system. This intermediary component generates pseudo residual bit error information by comparing soft decision values with decoded values, enabling accurate measurement of residual errors without significantly increasing overall system complexity.
3Reliability
If CRC code is used to detect frame errors, then reliability improves for error detection, but measurement precision deteriorates because it cannot detect residual bit errors within frames
Solution Approach 1:
The invention segments the error detection process into two levels: frame-level error detection using CRC codes and bit-level residual error detection using the pseudo estimation method. By dividing the detection function, the system maintains the reliability benefit of CRC for frame errors while adding precise measurement capability for residual bit errors within frames through soft decision value comparison.
Data Source
AI summary
A reception quality estimating apparatus, a wireless communication system and a reception quality estimating method wherein the communication qualities in a case where different communication schemes are used to have communication can be artificially estimated without switching the communication schemes to be used for the communication. A wireless communication apparatus (100) comprises a reception processing part (110), an artificially decoded error estimating part (120), and an upper-order layer processing part (130). An orthogonal vector data sequence (152), which is generated by a demodulating part (111) from a received signal (150), for each symbol in the current modulation scheme is used to artificially generate a likelihood metric value (155) obtained in a case of using a second communication scheme, which has a larger number of modulation multi-values than the current communication scheme, to perform a signal point arrangement. An artificially decoding part (122) then uses the likelihood metric value (155) to perform an artificial error correction decoding process, a result of which (156) is then subjected to an error detecting process.