MIMO-OTFS WLAN Transmission with LDPC for Reliable Multi-Stream Links
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Solution Overview
Problem
Existing Wi-Fi standards for WLAN lack effective methodologies supporting Orthogonal Time Frequency Space (OTFS) modulation, Low Density Parity Check (LDPC) coding, and multi-stream transmission, which are essential for enhancing data rates and error correction.
Innovation Solution
A communication system is developed with a transmitter that supports OTFS modulation and multi-stream transmission using LDPC coding, incorporating a MIMO configuration, including an FEC encoder, signal processors, and a receiver compatible with this transmission methodology, utilizing OTFS modulators and MIMO pre-coding to enhance data transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OTFS modulation with LDPC coding and multi-stream transmission is implemented, then data transmission reliability and error performance are improved, but device complexity and system implementation difficulty increase
Solution Approach 1:
The system segments the complex transmission process into distinct functional modules: LDPC encoder for error correction, OTFS modulator for time-frequency space modulation, and MIMO pre-coding block for multi-stream processing. Each module handles a specific aspect of the transmission, making the overall complex system manageable through functional decomposition.
Solution Approach 2:
The system performs preliminary error correction encoding using LDPC codes before modulation, and applies MIMO pre-coding before OTFS modulation. These preliminary processing steps prepare the data in advance for the main transmission process, ensuring reliability is built into the system architecture from the beginning rather than added as a post-processing step.
2Reliability
If LDPC coding is used for forward error correction, then error correction performance is improved, but processing complexity and computational requirements increase
Solution Approach 1:
The system replaces traditional convolutional coding mechanisms with LDPC coding, which uses iterative probabilistic decoding algorithms based on parity check matrices. This substitution provides superior error correction performance through parallel processing capabilities, trading increased computational complexity for significantly improved reliability in modern wireless communication environments.
3Productivity
If MIMO multi-stream transmission is implemented, then data rates are increased, but signal processing complexity and receiver design difficulty increase
Solution Approach 1:
The system merges multiple data streams into a unified MIMO transmission framework where multiple antennas transmit parallel streams simultaneously. The MIMO pre-coding block combines the streams with appropriate spatial processing, and the OTFS modulation integrates them into a cohesive time-frequency space signal structure, achieving high data rates through coordinated multi-antenna transmission.
Solution Approach 2:
The system transitions from traditional two-dimensional OFDM time-frequency representation to three-dimensional OTFS time-frequency-space representation. This dimensional extension allows MIMO multi-stream transmission to exploit not only time and frequency diversity but also spatial diversity across multiple antennas, significantly increasing data rates while maintaining signal integrity through the additional spatial dimension.
Data Source
AI summary
The present invention discloses a Orthogonal Time Frequency Space (OTFS) based communication system for Wireless Local Area Network (WLAN) involving Multiple Input Multiple Output (MIMO) channels comprising a transmitter including LDPC FEC (Forward Error Correction) encoder for input bit stream appended with pre-FEC bit sequence and transmission of LDPC encoded input data stream adapted for OTFS demodulation with the compatible receiver through multiple antennas with (Multiple Input Multiple Output) MIMO pre-coding, signal processor means including OTFS modulators and a receiver with multiple antennas compatible to said transmitter and signal processor means for said OTFS waveform based transmission and retrieving of the input data stream.