Channel Combining and Splitting for 5G Spectral Efficiency
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Solution Overview
Problem
Current communication systems, particularly in the 5G environment, face challenges in enhancing spectral efficiency for users with low Signal to Interference plus Noise Ratio (SINR), especially at cell edges, where existing modulation schemes like QAM do not effectively improve performance for a majority of users.
Innovation Solution
The technique involves channel combining and splitting, where messages are split into parts transmitted through degraded and enhanced channels, with FQAM applied to the degraded channel to increase spectral efficiency, using a combination of channel encoding and modulation techniques like FQAM and QAM to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If FQAM modulation scheme is applied to render interference signal non-Gaussian, then spectral efficiency is improved in low SINR area, but the proportion of users experiencing performance gain is very small (less than 1% of users)
Solution Approach 1:
The message is segmented into a first part and a second part, where the first part is transmitted through a degraded channel using FQAM modulation to achieve non-Gaussian interference properties and improved spectral efficiency for cell-edge users, while the second part is transmitted through an enhanced channel using conventional QAM modulation to ensure broad user coverage and maintain compatibility with existing systems
Solution Approach 2:
Different modulation schemes are applied to different parts of the message based on channel conditions: FQAM is applied locally to the first part transmitted through the degraded channel for users in low SINR areas, while conventional QAM is applied to the second part transmitted through the enhanced channel, allowing each segment to be optimized for its specific transmission environment
2Productivity
If channel combining and splitting is used to transmit message parts through degraded and enhanced channels, then spectral efficiency for cell-edge users is significantly enhanced, but device complexity increases due to multiple modulation schemes
Solution Approach 1:
The transmission system is segmented into two independent channels with different modulation schemes: the degraded channel uses FQAM modulation for the first message part, while the enhanced channel uses conventional QAM for the second message part. This segmentation allows each channel to be optimized independently, managing complexity by separating the sophisticated FQAM implementation from the simpler QAM implementation
Solution Approach 2:
The message splitting and channel combining functions act as intermediaries that manage the complexity of handling multiple modulation schemes. The transmitter segments the message and applies appropriate modulation to each part, while the receiver combines the signals from both channels, effectively mediating between the complex FQAM and simpler QAM schemes to achieve improved spectral efficiency without overwhelming device complexity
Data Source
AI summary
The present disclosure provides a method for transmitting messages using a channel combining/splitting transmission scheme for a 5G or pre-5G communication system. The method comprising: splitting the messages into a first part to be transmitted to a first channel, which is a degradation channel, and a second part to be transmitted to a second channel, which is an enhancement channel, generating first modulation signals by performing a channel encoding and frequency quadrature amplitude modulation on the first part and generating second modulation signals by performing a channel encoding and quadrature amplitude modulation on the second part, generating first transmission signals by combining the first modulation signals with a part of or all the second modulation signals and generating second transmission signals using the second modulation signals, and transmitting the generated first transmission signals and second transmission signals through the first channel and the second channel.