Component Interleaving With Cyclic Shift for RF Channel Diversity
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Solution Overview
Problem
Existing digital communication systems face challenges in achieving excellent channel diversity by evenly spreading the real and imaginary components of complex symbols across RF channels, which affects the reliability and robustness of data transmission.
Innovation Solution
The proposed method involves a component interleaver that applies cyclic shifts to the imaginary-component interleaver matrix, ensuring even distribution of components across RF channels and time-interleaving, optimizing the spreading of D-dimensional rotated constellation blocks to enhance channel diversity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transmission methods are used, then data transmission is achieved, but channel diversity is insufficient due to inadequate spreading of real and imaginary components across RF channels
Solution Approach 1:
The transmission method segments the complex symbols by separating real components and imaginary components, then independently interleaving them through different matrices (real-component interleaver matrix and imaginary-component interleaver matrix). This segmentation allows each component to be spread across RF channels independently, achieving better channel diversity without requiring complete redesign of the transmission system.
Solution Approach 2:
The patent introduces a new dimension of complexity by applying cyclic shifts to the imaginary-component interleaver matrix in addition to the real-component interleaver matrix. This dimensional expansion in the signal processing domain enables more sophisticated spreading patterns across RF channels, improving channel diversity by utilizing an additional degree of freedom in the transmission method.
2Reliability
If cyclic shifts are applied to imaginary-component interleaver matrix, then component distribution across RF channels is improved, but processing complexity increases
Solution Approach 1:
The cyclic shifts to the imaginary-component interleaver matrix are predetermined and applied in advance during the interleaving process. By pre-configuring the shift patterns, the method achieves uniform component distribution across RF channels without requiring complex real-time processing, thus balancing reliability improvement with manageable processing complexity.
3Reliability
If real and imaginary components are spread across RF channels, then channel diversity is enhanced, but time-interleaving coordination becomes more difficult
Solution Approach 1:
The patent segments the interleaving process into separate real-component and imaginary-component interleaver matrices, each handling specific components independently. This segmentation simplifies time-interleaving coordination by allowing each matrix to operate autonomously with its own spreading pattern, reducing the complexity of coordinating real and imaginary components across RF channels while still achieving enhanced channel diversity.
Data Source
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AI summary
Provided is a transmission method that converts an encoded block of data into first complex symbols each including a real component and an imaginary component, one or which is designated as a first component and the other as a second component; writes the first components and the second components of the first complex symbols respectively column by column into a first interleaver matrix and a second interleaver matrix having NR rows; applies a cyclic shift to each column of the second interleaver matrix in accordance with a predetermined shift pattern; and reads the first components from the first interleaver matrix and the second components from the cyclically shifted second interleaver matrix row by row. NR is a multiple of NRF greater than NRF (NRF being an integer greater than one), and the shift pattern for the cyclic shift includes only integers that are not a multiple of NRF.