EDMG PPDU LDPC Stream Distribution 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 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 and transmitter architectures that utilize vertical MIMO encoding and channel bonding to enhance data transmission rates, enabling up to 30 Gbps data rates and supporting multiple user MIMO communications by combining multiple 2.16 GHz channels into wider channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transmission methods are used in millimeter-wave band, then system simplicity is maintained, but data transmission rates are limited and channel bandwidth is insufficient
Solution Approach 1:
The transmitter architecture is segmented into distinct functional blocks including scrambler, encoder, mapper, I/Q generator, and up-sampler. Each block performs a specific processing function on the data stream, allowing for modular implementation and independent optimization of each component while achieving high overall transmission rates
Solution Approach 2:
The patent transitions from conventional single-carrier transmission to multi-carrier OFDM transmission by introducing frequency domain processing. Data is transformed from time domain to frequency domain using IFFT, enabling parallel transmission across multiple subcarriers and achieving higher data rates through spectral efficiency
2Productivity
If single channel transmission is used, then device complexity is low, but channel bandwidth is limited and cannot support high-speed data access
Solution Approach 1:
Multiple 2.16 GHz channels are merged into a single bonded channel to create a wider effective bandwidth. The system combines several narrowband channels carrying parallel data streams, aggregating their capacity to achieve the required high-speed data access while utilizing the limited spectrum available in the millimeter-wave band
3Adaptability or versatility
If conventional encoding schemes are used, then implementation simplicity is maintained, but multiple user MIMO communications cannot be supported
Solution Approach 1:
The system dynamically changes encoding parameters including modulation order (QPSK, 16-QAM, 64-QAM), code rate, and spatial stream configuration based on channel conditions and user requirements. This allows adaptation to multiple users with different service requirements while maintaining efficient spectral utilization
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.