Block Code Permutation for Open-Loop FD-MIMO Diversity
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Solution Overview
Problem
In 5G wireless communication systems, the closed-loop MIMO scheme faces challenges due to increased calculation overhead from channel feedback, and the open-loop scheme lacks effective block code solutions for large antenna arrays, leading to performance issues in reducing channel correlation and achieving transmit diversity.
Innovation Solution
The proposed method involves determining a permutation matrix based on a block code scheme to reduce antenna correlation in a full-dimensional MIMO system, allowing for efficient signal transmission without channel information feedback, thereby improving link performance and reducing system overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closed-loop MIMO scheme is used to achieve transmit diversity, then link performance is improved, but calculation overhead increases due to channel feedback
Solution Approach 1:
The patent extracts and removes the channel feedback requirement from the MIMO transmit diversity scheme. By using open-loop spatial multiplexing with pre-defined precoding matrices, the system achieves transmit diversity without requiring channel state information feedback, thereby eliminating the calculation overhead associated with closed-loop channel tracking and feedback processing
Solution Approach 2:
The patent segments the channel information into multiple precoding matrices that are pre-defined and selected based on channel conditions. Instead of continuously tracking and feedbacking channel state, the system divides the channel space into discrete segments represented by different precoding matrices, reducing the complexity of channel estimation and feedback while maintaining diversity performance
2Device complexity
If open-loop MIMO scheme is used to reduce calculation overhead, then system overhead is reduced, but antenna correlation increases leading to performance degradation
Solution Approach 1:
The patent introduces a new dimension of spatial processing by applying permutation matrices to the block code structure. This permutation operation redistributes the signal across multiple antennas in a structured manner that breaks up antenna correlation, effectively adding a new degree of freedom to the open-loop system without increasing feedback overhead
Solution Approach 2:
The patent combines block coding with permutation matrices to create a composite transmit structure. This composite approach integrates the error protection of block codes with the correlation-reducing properties of permutation operations, achieving both reliability and low correlation in open-loop MIMO transmission
3Reliability
If block code permutation is applied to reduce antenna correlation, then link performance is improved, but device complexity increases
Solution Approach 1:
The permutation matrices are pre-calculated and stored in the system before transmission. By preparing these matrices in advance based on the block code structure and antenna configuration, the system avoids real-time permutation calculations during transmission, significantly reducing processing complexity while maintaining the correlation-reducing benefits
Data Source
AI summary
The present disclosure relates to a pre-5th-generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-generation (4G) communication system such as long term evolution (LTE). Disclosed are an apparatus and a method for a permutation of a block code in a wireless communication system. A method of operating a transmitting node in a wireless communication system includes: determining a permutation matrix according to a block code scheme; generating symbols corresponding to a plurality of antennas based on the block code scheme and the permutation matrix; and transmitting the symbols to a receiving node through the plurality of antennas. The permutation matrix is determined based on a number of blocks and an arrangement structure of the plurality of antennas, and the number of blocks comprises a number of sub-blocks within a code block corresponding to the permutation matrix.