FQAM Modulation for Cell-Edge Interference in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face limitations in channel capacity for cell-edge users due to high interference, with existing technologies mainly assuming Gaussian distribution for interference signals, which does not maximize decoding performance, and there is a need for a method to measure and utilize non-Gaussian interference characteristics effectively.
Innovation Solution
A method and device using a hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) scheme to allocate resources for data transmission, measure channel quality information (CQI) based on interference characteristics, and perform scheduling in wireless communication systems, allowing for robust signal transmission even at low Signal to Interference plus Noise Ratio (SINR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If QAM-based modulation is used to make interference signals close to Gaussian distribution, then decoding complexity is reduced, but channel capacity is not maximized
Solution Approach 1:
The patent changes the modulation scheme from conventional QAM to FQAM (Frequency-Shift Keying combined with QAM), fundamentally altering the signal parameters to exploit non-Gaussian interference characteristics. This parameter change enables the system to achieve higher channel capacity by matching the modulation scheme to the actual interference distribution, rather than forcing interference to approximate Gaussian distribution.
Solution Approach 2:
Instead of making interference signals conform to Gaussian distribution through QAM modulation, the patent inverts the approach by designing FQAM modulation to exploit and adapt to non-Gaussian interference characteristics. This inversion allows the system to achieve better performance by embracing the actual interference nature rather than trying to transform it.
2Ease of operation
If Gaussian distribution assumption is used for interference signals, then decoding is simplified, but decoding performance is not optimized
Solution Approach 1:
The patent introduces FQAM modulation which changes the fundamental parameters of how interference is handled. By combining Frequency-Shift Keying with QAM, the system creates a modulation scheme that naturally adapts to non-Gaussian interference, providing both simplified decoding operations and optimized performance simultaneously.
Solution Approach 2:
The FQAM modulation scheme enables the system to serve itself by automatically adapting to non-Gaussian interference characteristics without requiring complex external interference cancellation mechanisms. The modulation design inherently provides the robustness needed for simplified decoding while maintaining high performance.
3Area of stationary object
If cell-edge users are served with traditional modulation schemes, then system coverage is extended, but transmission efficiency is reduced due to high interference
Solution Approach 1:
The patent applies FQAM modulation to cell-edge user transmissions, changing the modulation parameters to be more robust against high interference conditions. This parameter change enables effective communication in low SINR environments, extending coverage to cell edges while maintaining high transmission efficiency that would be impossible with traditional QAM schemes.
Data Source
AI summary
The present invention relates to a method for transmitting data in a wireless communication system, comprising the steps of: allocating, by a base station, a resource for transmitting data modulated by a hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) scheme in which a QAM scheme and a FSK scheme are combined; transmitting, by the base station, a sequence modulated by the FQAM scheme, to a mobile station, via an interference measurement channel; transmitting, by the base station, a reference signal for measuring channel quality information (CQI) to the mobile station; receiving, by the base station, CQI estimated based on an interference characteristic of the interference measurement channel, from the mobile station, and performing scheduling of the mobile station based on the received CQI; and transmitting, by the base station, the data modulated by the FQAM scheme to the mobile station.