EDMG PPDU LDPC Stream Mapping for Multi-User MIMO Throughput
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems in the millimeter-wave band face challenges in efficiently transmitting high-speed data due to limitations in data transmission rates and channel bandwidth, particularly in supporting multiple user MIMO communications over directional multi-gigabit channels.
Innovation Solution
The implementation of an Enhanced Directional Multi-Gigabit (EDMG) Physical Layer Protocol Data Unit (PPDU) format and transmitter architectures that utilize vertical MIMO encoding and channel bonding techniques to enhance data transmission rates, enabling support for Single User (SU) and Multi-User (MU) MIMO communications over wider channel bandwidths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transmission methods are used, then system simplicity is maintained, but data transmission rate is limited to 7 Gbps
Solution Approach 1:
The data stream is segmented into multiple spatial streams that are transmitted simultaneously over the same frequency channel. Each spatial stream carries a portion of the data, and these streams are combined at the receiver through signal processing to reconstruct the original data at enhanced rates up to 30 Gbps
Solution Approach 2:
The system transitions from single-dimensional transmission (one stream per channel) to multi-dimensional transmission by utilizing the spatial dimension. Multiple spatial streams are transmitted in parallel across different antenna elements, creating a three-dimensional signal space that enables higher data rates without requiring additional frequency resources
2Productivity
If channel bandwidth is increased, then data transmission rate improves, but spectrum efficiency deteriorates
Solution Approach 1:
Multiple spatial streams are merged and transmitted simultaneously over the same frequency channel. The receiver combines these streams through signal processing, effectively multiplying the data rate without requiring proportional increases in bandwidth. This merging of spatial channels achieves spectrum efficiency while maintaining high throughput
3Adaptability or versatility
If vertical MIMO encoding is implemented, then support for multiple user communications is enhanced, but encoding complexity increases
Solution Approach 1:
The vertical MIMO encoding scheme is designed to universally support both Single User (SU) and Multi-User (MU) MIMO communications through the same fundamental mechanism. The encoding structure can adapt to serve one user or multiple users simultaneously, providing multi-functionality without requiring entirely separate encoding systems
Data Source
AI summary
For example, an EDMG STA may generate an LDPC coded bit stream for a user based on data bits for the user in an EDMG PPDU, the LDPC coded bit stream for the user including a concatenation of a plurality of LDPC codewords, a count of the plurality of LDPC codewords is based at least on a codeword length for the user and on a code rate for the user; generate encoded and padded bits for the user by concatenating the LDPC coded bit stream with a plurality of coded pad zero bits, a count of the coded pad zero bits is based at least on a count of one or more spatial streams for the user and on the count of the plurality of LDPC codewords for the user; and distribute the encoded and padded bits for the user to the one or more spatial streams for the user.