EDMG PPDU Structure for LDPC-Coded Multi-User mmWave Transmission
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Solution Overview
Problem
Current wireless communication systems in the millimeter-wave band face challenges in efficiently transmitting high-speed data over directional multi-gigabit channels, particularly in supporting multiple user MIMO communications and achieving aligned data fields across users, which limits data transmission rates and network capacity.
Innovation Solution
The implementation of an Enhanced Directional Multi-Gigabit (EDMG) Physical Layer Protocol Data Unit (PPDU) format, which includes specific header fields and encoding schemes, such as LDPC encoding, to support SU and MU transmissions, ensuring aligned data fields and increased channel bandwidth through channel bonding and spatial stream management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel bonding and spatial stream management are implemented, then data transmission rates are enhanced up to 30 Gbps, but device complexity increases due to multiple encoding schemes and header fields
Solution Approach 1:
The PPDU format is segmented into distinct fields (Legacy STF, Legacy L-CEF, EDMG Header A, EDMG Header B, Data Field) with specific encoding schemes applied to different segments. LDPC encoding is used for the data field while legacy fields use conventional encoding, allowing high data rates without uniformly complex encoding across the entire signal
Solution Approach 2:
The patent implements dynamic spatial stream management where the number of spatial streams and channel bonding configuration can be adjusted based on channel conditions and user requirements. The EDMG headers contain dynamic fields that adapt to different transmission scenarios, enabling flexible optimization between data rate and complexity
2Productivity
If aligned data fields are ensured across multiple users, then network capacity increases, but manufacturing precision requirements increase for maintaining synchronization
Solution Approach 1:
The Legacy STF and Legacy L-CEF fields are transmitted before the EDMG-specific fields to establish preliminary synchronization and channel estimation. This preliminary action provides a common reference for all users before the aligned data fields are transmitted, reducing the precision requirements for maintaining multi-user synchronization
Solution Approach 2:
The EDMG Header A and Header B fields act as intermediaries that carry control information and alignment parameters for multiple users. These header fields mediate the synchronization process by providing explicit timing and resource allocation information, allowing aligned data field transmission without requiring extremely tight synchronization precision
Data Source
AI summary
Some demonstrative embodiments include apparatuses, devices, systems and methods of communicating a Physical Layer Protocol Data Unit (PPDU). For example, an Enhanced Directional Multi-Gigabit (DMG) (EDMG) station (STA) may be configured to encode a Physical Layer (PHY) Service Data Unit (PSDU) of at least one user in an EDMG PHY Protocol Data Unit (PPDU) according to an EDMG Low-Density Parity-Check (LDPC) encoding scheme, which is based at least on a count of one or more spatial streams for transmission to the user; and transmit the EDMG PPDU in a transmission over a channel bandwidth in a frequency band above 45 Gigahertz (GHz).