Multicarrier Data Transmission ICI Cancellation via Coding Matrices
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Solution Overview
Problem
Current communication systems face challenges in minimizing InterCarrier Interference (ICI) while maintaining system efficiency and simplicity, particularly in OFDM/OFDMA systems, where existing methods either complicate receiver construction or reduce spectral efficiency.
Innovation Solution
The use of a transmission coding matrix and a reception coding matrix in a communication system to group and transform data signals, employing a frequency-domain ICI canceling code of a certain code rate, which improves frequency band efficiency, reduces receiver complexity, and enhances channel capacity and Bit-Error-Rate (BER) performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency or time domain equalization is used to remove ICI, then ICI removal performance is improved, but receiver construction complexity increases
Solution Approach 1:
The patent replaces complex mechanical equalization structures (frequency/time domain equalizers requiring multiple processing stages) with a coding-based approach using transmission and reception coding matrices. This substitution achieves ICI removal through algebraic operations rather than complex signal processing structures, thereby maintaining performance while reducing receiver complexity.
Solution Approach 2:
The patent changes the fundamental parameter of ICI removal from signal processing domain (equalization) to coding domain (matrix operations). By using transmission coding matrix multiplication at the transmitter and corresponding reception coding matrix operations at the receiver, the system achieves ICI cancellation through parameter transformation rather than complex filtering or equalization structures.
2Device complexity
If ICI removal scheme using code rate 1/k is employed, then receiver construction is simplified, but spectral efficiency is reduced by 1/k times
Solution Approach 1:
The patent merges the ICI removal function with the data transmission function by using coding matrices that operate on groups of subcarriers. Instead of separate ICI removal stages, the transmission coding matrix integrates both data encoding and ICI cancellation preparation, while the reception coding matrix simultaneously decodes and cancels ICI, thereby improving spectral efficiency compared to traditional code rate schemes.
Solution Approach 2:
The patent transitions from scalar code rate multiplication to matrix operations in the frequency domain. By using transmission coding matrices that operate on groups of subcarriers (dimensionality change from single subcarrier to subcarrier groups), the system achieves ICI removal without the spectral efficiency penalty of traditional code rate schemes, as the matrix operations preserve more information dimensions.
3Reliability
If frequency-domain partial response encoding is applied, then ICI removal effect is improved, but receiver construction complexity increases due to MLSE requirement
Solution Approach 1:
The patent replaces the Maximum-Likelihood Sequence Estimator (MLSE) mechanism with a coding matrix-based detection approach. Instead of requiring complex sequential estimation algorithms, the system uses reception coding matrix multiplication that directly processes the received signals to cancel ICI and detect data, substituting probabilistic sequence estimation with deterministic matrix operations.
Solution Approach 2:
The patent uses transmission coding matrices at the transmitter and corresponding reception coding matrices at the receiver that mirror each other's structure. This copying approach allows the receiver to reverse the transmission encoding operations, thereby canceling ICI effects without requiring complex detection algorithms like MLSE, as the known transmission matrix structure enables direct inversion or pseudo-inversion operations.
Data Source
AI summary
Disclosed is a data transmission/reception method and system for minimizing intercarrier interference (ICI) in a communication system using a multicarrier. The data transmission method by a transmitter includes grouping transmission signals in units of a predetermined number of transmission signals when the transmitter has received the transmission signals, multiplying each group of the transmission signals by a transmission coding matrix, and transmitting the transmission signals multiplied by the transmission coding matrix to a receiver.