Coordinate Interleaved Power Index Modulation for Diversity Enhancement
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Solution Overview
Problem
Existing wireless communication technologies face challenges in achieving high spectral efficiency and diversity order, particularly in OFDM systems, which limits their reliability and error performance in fading channels.
Innovation Solution
The implementation of coordinate interleaved power index modulation (CI-PIM) in wireless communication systems, which involves dividing data bits into symbol bits and carrier index bits, generating component-interleaved symbols, and determining carrier indices and power values for each symbol, thereby enhancing diversity order and error performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OFDM with index modulation (OFDM-IM) or power distribution index modulation (OFDM-PIM) is used to improve reliability through diversity enhancement, then diversity order is increased to 2, but spectral efficiency remains insufficient
Solution Approach 1:
The invention segments the modulation process into coordinate interleaving (separating real and imaginary components) and power index modulation (assigning different power levels to different subcarriers). This segmentation allows independent optimization of diversity enhancement and spectral efficiency, resolving the contradiction between reliability improvement and spectral efficiency maintenance.
Solution Approach 2:
The invention combines two modulation techniques (coordinate interleaving and power index modulation) to create a composite modulation scheme. This composite approach integrates the diversity enhancement capability of coordinate interleaving with the spectral efficiency of power index modulation, achieving both high reliability and high spectral efficiency simultaneously.
2Reliability
If coordinate interleaved OFDM-IM (CI-OFDM-IM) is used to provide diversity order of 2 by carrying real and imaginary parts over different activated subcarriers, then reliability is improved, but spectral efficiency remains insufficient
Solution Approach 1:
The invention changes the power parameter of subcarriers dynamically based on the data being transmitted. By assigning different power levels to different subcarriers according to the coordinate interleaving pattern, the system achieves both diversity enhancement and improved spectral efficiency, overcoming the limitation of traditional CI-OFDM-IM.
Data Source
AI summary
Methods and techniques are described for increasing the reliability of data transmission at a high error performance in wireless transmission. In particular, a group of bits representing the data is split into symbol bits and carrier index bits and one or more component-interleaved symbols are generated. The one or more component-interleaved symbols correspond to complex symbols that are obtained by sequentially forming real and imaginary components of intermediate symbols out of said symbol bits; and interleaving said real and/or imaginary components among the intermediate symbols. A carrier index and a power value is determined for each of the one or more component-interleaved symbols based on the carrier index bits, and each of the one or more component-interleaved symbols is transmitted on a respective carrier given by the determined carrier index and with the determined power value.