OFDM Interleaving with FFT Mapping to Cut Errors and Memory
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Solution Overview
Problem
Current Multi-Band Orthogonal Frequency Division Multiplexing (OFDM) systems face challenges in completely correcting transmission errors and require significant memory and processing resources for interleaving, leading to data transmission delays.
Innovation Solution
An interleaving method that performs symbol interleaving, tone interleaving, and cyclic shift simultaneously at the transmitting end, reducing the need for memory and simplifying the system structure by controlling the operation rate and using Fast Fourier Transform (FFT) mapping followed by Quadrature Phase Shift Keying (QPSK) modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional symbol interleaving or tone interleaving schemes are used, then data transmission can be performed, but transmission errors cannot be completely corrected and significant memory resources are required
Solution Approach 1:
The patent combines symbol interleaving and tone interleaving into a single unified interleaving operation. By merging these two separate interleaving processes into one step, the system achieves complete error correction capability while significantly reducing memory resource requirements. The unified interleaver performs both symbol-level and tone-level reordering simultaneously, eliminating the need for separate memory buffers for each interleaving stage.
2Reliability
If separate symbol interleaving and tone interleaving processes are used, then data can be transmitted, but data transmission delays occur due to multiple processing steps
Solution Approach 1:
The patent merges symbol interleaving and tone interleaving into a single unified process that occurs in one processing step. This consolidation eliminates the sequential execution of separate interleaving operations, thereby reducing data transmission delays while maintaining complete error correction capability. The unified interleaver reorders both symbols and tones simultaneously, achieving time efficiency without sacrificing reliability.
3Reliability
If conventional interleaving schemes are used, then data transmission can proceed, but the system structure becomes complex requiring separate interleaving modules
Solution Approach 1:
The patent consolidates symbol interleaving and tone interleaving functions into a single unified interleaving module. This merger simplifies the system structure by eliminating the need for separate interleaving modules and their associated control logic. The unified interleaver achieves complete error correction capability while reducing structural complexity, as it implements both interleaving operations through a single integrated component rather than multiple separate components.
Data Source
AI summary
Provided is an interleaving method that can reduce error occurring during transmission at a receiving end in an Orthogonal Frequency Division Multiplexing (OFDM) system. According to the interleaving method, transmitted data bits are recorded in an interleaving memory; and the stored data bits are read based on a predetermined sequence to perform symbol interleaving, tone interleaving and cyclic shift simultaneously. Also, to simplify the logic of the OFDM system, the data bits transmitted from an interleaver go through Fast Fourier Transform (FFT) mapping, and the FFT mapped data bits are modulated. In short, the logic can be simplified by performing FFT mapping followed by modulation.