Multi-Band MIMO Coding for Low-Correlation Frequency Diversity
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Solution Overview
Problem
MIMO systems using multiple fundamental bands suffer from insufficient frequency diversity effects, limiting their ability to improve reception quality, especially in environments where direct waves dominate.
Innovation Solution
A transmitter that performs MIMO transmission by allocating components of error correction coded data across multiple fundamental bands, utilizing pre-coding and phase change matrices to enhance frequency diversity, and interleaving data across multiple frequency channels to reduce correlation between channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MIMO transmission is performed using multiple fundamental bands, then transmission capacity is increased, but frequency diversity effect is insufficient
Solution Approach 1:
The error correction coded block is divided into multiple segments that are allocated to different fundamental bands. This segmentation allows the system to transmit data across multiple frequency channels while maintaining the ability to exploit frequency diversity, as each segment can be received through different propagation paths and frequency characteristics.
Solution Approach 2:
The patent extends MIMO transmission from a single fundamental band to multiple fundamental bands, adding a frequency dimension to the spatial multiplexing. This dimensional expansion increases transmission capacity while the distribution across multiple bands inherently provides frequency diversity by exposing data to different frequency-selective fading characteristics.
2Area of stationary object
If data is transmitted over multiple frequency channels, then transmission bandwidth is increased, but correlation between channels increases
Solution Approach 1:
Different segments of the error correction coded block are allocated to different fundamental bands with specific local characteristics. This local quality assignment ensures that each frequency channel carries data segments that benefit from its specific propagation characteristics, while the overall system maintains low correlation through the distributed allocation strategy.
Solution Approach 2:
Error correction coding is performed preliminarily on the entire data block before allocating segments to different frequency channels. This preliminary error correction coding creates inter-dependency among segments transmitted over different channels, reducing effective correlation and enabling the receiver to exploit diversity even when channels exhibit some correlation.
Data Source
AI summary
A transmission device that performs multiple-input multiple-output (MIMO) transmission of transmit data using a plurality of fundamental bands. The transmission device includes an error correction coding unit, a mapping unit, and a MIMO coding unit. The error correction coding unit, for each data block of predefined length, performs error correction coding and thereby generates an error correction coded frame. The mapping unit maps each predefined number of bits in the error correction coded frame to a corresponding symbol and thereby generates an error correction coded block. The MIMO coding unit performs MIMO coding with respect to the error correction coded block. Components of data included in the error correction coded block are allocated to at least two of the fundamental bands and transmitted.