EDMG PPDU Transmit Chain Mapping for Channel-Bonded 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 multiple user MIMO communications and channel bonding techniques.
Innovation Solution
The implementation of an Enhanced Directional Multi-Gigabit (EDMG) Physical Layer Protocol Data Unit (PPDU) format, which includes a combination of legacy and EDMG fields, allows for increased channel bandwidth through channel bonding and supports SU and MU MIMO transmissions by using advanced transmitter architectures that incorporate scramblers, LDPC encoders, constellation mappers, and spatial mapping techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel bonding and MIMO techniques are implemented, then data transmission rate is improved, but device complexity increases
Solution Approach 1:
The transmitter architecture is segmented into distinct functional modules: scrambler module, LDPC encoder module, constellation mapper module, and spatial mapper module. Each module handles a specific processing stage, allowing independent optimization and simplifying the overall complex system while achieving high data transmission rates through channel bonding and MIMO techniques.
2Adaptability or versatility
If multiple transmit chains are used for MIMO, then communication capability is improved, but system complexity increases
Solution Approach 1:
The spatial mapper module is designed to universally support both SU-MIMO and MU-MIMO operations, as well as different channel bonding configurations. This multi-functional design allows the same hardware architecture to adapt to various communication scenarios without requiring separate dedicated systems for each mode, thereby improving versatility while controlling complexity.
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 (LDPC) 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.