Multicarrier Signal Allocation for Interference-Aware Bit Mapping
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Solution Overview
Problem
In multicarrier wireless communication systems, interference from shared frequency bands leads to deteriorated reception quality and saturation of bit error rate (BER) performance, especially when systematic bits and parity bits are not differentiated in subcarrier allocation, and retransmissions are hindered due to persistent interference signals.
Innovation Solution
A communication system that prioritizes allocating systematic bits to non-superposed bands with no interference and parity bits to superposed bands with interference, using error correction coding and interleaving to enhance reception quality and reduce error occurrence during retransmissions by utilizing subcarriers with no interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference-avoidance operation is performed by detecting frequency band with interference signal and shifting desired signal frequency band, then reception precision of desired signal is improved, but frequency utilization efficiency deteriorates
Solution Approach 1:
The patent applies local quality by differentiating treatment of systematic bits and parity bits in subcarrier allocation. Systematic bits are preferentially allocated to non-superposed bands (interference-free regions) while parity bits can be allocated to superposed bands (interference regions). This localized differentiation optimizes reception precision for critical data while maintaining frequency utilization efficiency.
2Productivity
If superposed multicarrier transmission is used to increase frequency utilization efficiency, then frequency utilization efficiency is improved, but reception precision deteriorates due to interference signals
Solution Approach 1:
The patent segments the frequency band into non-superposed bands (interference-free) and superposed bands (interference regions). By dividing the transmission resources this way, the system can allocate different types of data bits to different segments, achieving both high frequency utilization and reception precision.
Solution Approach 2:
The patent applies local quality by differentiating treatment of systematic bits and parity bits in subcarrier allocation. Systematic bits are preferentially allocated to non-superposed bands (interference-free regions) while parity bits can be allocated to superposed bands (interference regions). This localized differentiation optimizes reception precision for critical data while maintaining frequency utilization efficiency.
3Device complexity
If systematic bits and parity bits are not differentiated in subcarrier allocation, then device complexity is reduced, but bit error rate performance saturates due to interference
Solution Approach 1:
The patent introduces local quality differentiation in the allocation process by treating systematic bits and parity bits differently. This differentiation is implemented through a priority-based allocation mechanism that assigns systematic bits to interference-free subcarriers first, then allocates parity bits to remaining subcarriers including those in interference regions. The complexity increase is minimal while BER performance improves significantly.
Data Source
AI summary
A communication system employs a transmitting device and a receiving device. The transmitting device allocates certain data, based on transmission data, to both a non-superposed band, corresponding to a frequency band with no interference signal present, and a superposed band, corresponding to a frequency band where an interference signal is present. Alternatively, the transmitting device allocates the data to the non-superposed band while giving a higher priority to the non-superposed band. The transmitting device then generates and transmits a multicarrier signal based on the allocation, so that the receiving device can receive it.