Single Carrier STBC MIMO for Millimeter-Wave Data Rates
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Solution Overview
Problem
Current wireless communication systems in the millimeter-wave band face challenges in achieving high data transmission rates and efficient communication over directional multi-gigabit channels, particularly in supporting multiple-input-multiple-output (MIMO) transmissions that can handle simultaneous data streams effectively.
Innovation Solution
The implementation of a Single Carrier (SC) Space Time Block Coding (STBC) scheme with a modified symbol block structure, utilizing Golay sequences as Guard Intervals, allows for efficient transmission and reception of multiple space-time streams over directional bands, enabling enhanced data rates and reliability in MIMO communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional MIMO transmission schemes are used in millimeter-wave bands, then directional communication can be established, but data transmission rates are limited and cannot achieve high-speed data access
Solution Approach 1:
The transmission is segmented into multiple space-time streams that are processed independently through STBC encoding. Each stream is modulated and transmitted separately through different antennas, allowing parallel data transmission that increases overall data rate while maintaining individual stream reliability
Solution Approach 2:
The patent transitions from traditional frequency-domain OFDM transmission to time-domain Single Carrier transmission with STBC. This dimensional change from frequency parallelization to time-space parallelization enables higher data rates in millimeter-wave bands while avoiding the beamforming issues that compromise reliability
2Reliability
If STBC schemes are implemented to maintain reliability, then unintentional beamforming is avoided, but data transmission rates are reduced
Solution Approach 1:
The patent modifies the STBC implementation by changing key parameters: using Single Carrier modulation instead of OFDM, implementing modified symbol block structures, and using Golay sequences as Guard Intervals. These parameter changes enable STBC to achieve both high reliability (avoiding beamforming) and high data rates (30 Gbps) simultaneously
3Productivity
If modified symbol block structure with Golay sequences is used, then data transmission rates increase to 30 Gbps, but system complexity increases
Solution Approach 1:
Golay sequences are pre-computed and stored as Guard Intervals before transmission. This preliminary preparation eliminates the need for complex real-time guard interval generation during transmission, reducing system complexity while maintaining the high data rate benefits of the modified symbol block structure
Solution Approach 2:
The patent uses copied and reused Golay sequences as Guard Intervals for multiple space-time streams. Instead of generating unique guard intervals for each stream, the same Golay sequences are copied and applied across different streams, significantly reducing computational complexity while maintaining performance
Data Source
AI summary
For example, a station may generate a plurality of space-time streams including at least a first space-time stream and a second space-time stream, the first space-time stream including, in a first interval, a first data sequence followed by a first Guard Interval (GI) sequence, the first space-time stream comprising, in a second interval subsequent to the first interval, a second data sequence followed by the first GI sequence, the second space-time stream comprising, in the first interval, a sign-inverted and time-inverted complex conjugate of the second data sequence followed by a second GI sequence, the second space-time stream comprising, in the second interval, a time-inverted complex conjugate of the first data sequence followed by the second GI sequence; and transmit a Single Carrier (SC) Multiple-Input-Multiple-Output (MIMO) transmission based on the plurality of space-time streams.