MIMO Base Station Precoding for Capacity and Interference
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Solution Overview
Problem
Current multi-antenna communication systems face challenges in increasing system capacity and data transmission efficiency, particularly in high-spatial correlation environments, where conventional techniques like Spatial Diversity and Spatial Multiplexing struggle to maintain performance due to interference and reduced channel capacity.
Innovation Solution
The implementation of a method using Multiple-Input Multiple-Output (MIMO) schemes with space pre-coding, where a base station determines the optimal antennas and space pre-coding method based on channel status information, multiplexes data streams, and performs OFDM modulation to enhance system capacity and reduce CSI feedback overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Spatial Diversity or Spatial Multiplexing techniques are used in high-spatial correlation environments, then data transmission can be performed, but system capacity increases slowly and interference increases
Solution Approach 1:
The patent applies space pre-coding before data transmission to pre-compensate for channel effects. The base station determines space pre-coding methods based on channel status information before actual data transmission, allowing the system to proactively adapt to channel conditions and reduce interference in advance
Solution Approach 2:
The patent dynamically changes transmission parameters including selecting different space pre-coding methods (such as DFT-based precoding) based on channel spatial correlation characteristics. By adapting parameters like pre-coding matrix selection to match channel conditions, the system optimizes performance in high-spatial correlation environments
2Ease of operation
If conventional MIMO techniques are used, then data transmission is supported, but CSI feedback overhead increases
Solution Approach 1:
The patent extracts and utilizes downlink channel status information that is already available at the base station through normal channel estimation, rather than requiring complete uplink CSI feedback from terminals. This selective use of available information reduces feedback overhead while maintaining transmission effectiveness
Solution Approach 2:
The base station performs self-adaptation by determining space pre-coding methods based on channel status information it already possesses. The system serves itself by utilizing its own channel knowledge without requiring extensive terminal feedback, thereby reducing CSI feedback overhead
Data Source
AI summary
An apparatus for transmitting data in a base station of a wireless communication system that transmits data depending on channel status information fed back from terminals and uses a plurality of antennas. Based on the channel status information, a scheduler determines a terminal to which the base station will transmit data, determines antennas via which the base station will transmit data among the plurality of antennas, and determines a space pre-coding method. A multiplexer multiplexes transmission data into a plurality of data streams according to the number of the determined antennas. A modulation and coding unit performs modulation and coding on each of the data streams. A pre-coding controller outputs a matrix select signal for selecting one of a plurality of space pre-coding matrixes according to the space pre-coding method. A space pre-coder spatial-codes each of the coded streams with the matrix selected based on the matrix select signal. An OFDM modulator performs OFDM modulation on each of the spatial-coded streams. An RF unit transmits each of the OFDM-modulated streams via an associated antenna.