EDMG PPDU Bit Padding Across Spatial Streams for MU-MIMO
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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 multi-user MIMO communications over directional bands above 45 GHz.
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 channel bandwidths of up to 8.64 GHz and supporting multi-user MIMO communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transmission methods are used in millimeter-wave band, then system complexity is kept simple, but data transmission rate is limited and cannot achieve high-speed data access
Solution Approach 1:
The transmission system is segmented into multiple spatial streams that are processed independently through vertical MIMO encoding. Each stream can be encoded and transmitted separately, allowing parallel processing that increases overall data transmission rate while managing complexity through modular architecture
Solution Approach 2:
The patent introduces vertical MIMO encoding that utilizes the spatial dimension by transmitting multiple independent data streams through the same frequency and time resources. This dimensional approach to multiplexing dramatically increases data transmission rate without requiring additional bandwidth
2Productivity
If channel bandwidth is increased to improve data transmission rate, then productivity increases, but channel bandwidth availability in millimeter-wave band is limited
Solution Approach 1:
Instead of expanding bandwidth horizontally, the patent utilizes the spatial dimension through vertical MIMO encoding. Multiple spatial streams are transmitted over the same limited bandwidth, effectively multiplying the data transmission rate without requiring additional frequency spectrum
Solution Approach 2:
Multiple spatial streams are combined at the receiver through sophisticated signal processing. The transmitter merges multiple data flows into parallel streams that share the same physical channel, achieving high data rates within limited bandwidth constraints
3Productivity
If multi-user MIMO communications are implemented, then system capacity and data transmission rate are enhanced, but device complexity and processing requirements increase
Solution Approach 1:
The multi-user MIMO system segments users into different spatial streams that are independently encoded and transmitted. Each user's data is processed through separate encoding paths, allowing parallel processing that increases system capacity while managing complexity through structured modular architecture
Solution Approach 2:
The system employs feedback mechanisms where channel state information is exchanged between transmitter and receivers. This feedback enables dynamic adjustment of spatial streams and encoding parameters, optimizing system capacity while managing processing complexity through adaptive control
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.