EDMG PPDU Transmission with Golay Spreading for Multi-User 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, particularly in achieving multi-gigabit data rates over directional links, and supporting multiple user MIMO communications, which are essential for next-generation wireless networks like 5G and beyond.
Innovation Solution
The implementation of an Enhanced Directional Multi-Gigabit (EDMG) Physical Layer Protocol Data Unit (PPDU) format that includes both legacy and EDMG portions, utilizing advanced transmitter architectures with Golay sequences, LDPC encoding, and spatial expansion with cyclic shift diversity to enable high-speed data transmission and multi-user MIMO capabilities over mmWave frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced transmitter architectures with Golay sequences, LDPC encoding, and spatial expansion are implemented, then data transmission rates are enhanced up to 30 Gbps, but device complexity increases
Solution Approach 1:
The PPDU format is segmented into legacy portion and EDMG portion, allowing incremental adoption where legacy devices can process only the legacy portion while EDMG-capable devices can utilize the full format for higher data rates
Solution Approach 2:
The transmitter architecture is designed to support multiple functions: it can operate in legacy mode for compatibility with existing devices and in EDMG mode for high-speed multi-user MIMO communications, making it universally applicable across different device capabilities
2Adaptability or versatility
If spatial expansion with cyclic shift diversity is used to support multi-user MIMO communications, then multi-user capability is enhanced, but signal processing complexity increases
Solution Approach 1:
The spatial expansion employs cyclic shifts that can be dynamically adjusted based on the number of users and channel conditions, allowing the system to adapt its complexity to match the actual multi-user MIMO requirements rather than always operating at maximum complexity
Solution Approach 2:
The system changes parameters such as cyclic shift values and spatial expansion factors to optimize performance for different multi-user scenarios, enabling flexible adaptation to varying numbers of users and channel states without requiring complete redesign of the signal processing architecture
Data Source
AI summary
An apparatus of a transmitter may include, for example, a Golay builder to build modulated Golay sequences for at least a non-EDMG Short Training Field (L-STF), and a non-EDMG Channel Estimation Field (L-CEF) of a PPDU; a scrambler to generate scrambled bits by scrambling bits of a non-EDMG header (L-header) and a data field of the PPDU; an encoder to encode the scrambled bits into encoded bits according to a low-density parity-check (LDDC) code; a constellation mapper to map the encoded bits into a stream of constellation points according to a constellation scheme; a spreader to spread the stream of constellation points according to a Golay sequence; and a transmit chain mapper to map a bit stream output from the Golay builder and the spreader to a plurality of transmit chains by applying a spatial expansion with relative cyclic shift over the plurality of transmit chains.