Transmit Space-Frequency Diversity Scheme for mmWave Reliability
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Solution Overview
Problem
Current wireless communication systems in the millimeter-wave (mmWave) band face challenges in achieving high data transmission rates and reliability due to interference and channel variability, particularly in directional frequency bands like 60 GHz, where existing technologies struggle to effectively combine space and frequency diversity for robust communication.
Innovation Solution
The implementation of a transmit space-frequency diversity scheme that combines Dual Carrier Modulation (DCM) with Alamouti space-time techniques, allowing for the extraction of both space and frequency diversity gains, and utilizing a space-frequency mapping scheme to map data symbols onto subcarriers in a way that exploits channel diversity and avoids data loss in frequency selective channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wireless communication schemes are used in mmWave band, then device complexity remains low, but data transmission rate and reliability deteriorate due to interference and channel variability
Solution Approach 1:
The patent combines Dual Carrier Modulation (DCM) with Alamouti space-time techniques to create a unified transmit space-frequency diversity scheme. This merging of frequency diversity (from DCM) and space-time diversity (from Alamouti) allows the system to simultaneously achieve high data rates and robustness against interference and channel variability in mmWave environments
Solution Approach 2:
The patent extends traditional space-time diversity by adding the frequency dimension through DCM. By mapping data symbols across multiple carriers and antennas in a three-dimensional space-frequency-time domain, the system exploits additional diversity gains without significantly increasing device complexity
2Reliability
If space-frequency mapping is implemented to exploit channel diversity, then communication robustness improves, but device complexity increases
Solution Approach 1:
The patent segments the transmission process into distinct stages: data symbol generation, DCM modulation across multiple carriers, Alamouti encoding across antennas, and space-frequency mapping. This segmentation allows each component to be optimized independently while maintaining overall system robustness without overwhelming complexity
3Object-affected harmful factors
If transmit space-frequency diversity scheme is used, then resistance to interference and frequency selectivity improves, but system complexity increases
Solution Approach 1:
The patent converts the harmful effects of frequency selectivity and interference into beneficial diversity gains. By intentionally transmitting the same data across multiple frequencies (DCM) and multiple antennas (Alamouti), the system transforms potential interference sources into redundant information paths that improve robustness when combined at the receiver
Data Source
AI summary
For example, a wireless station may be configured to modulate a plurality of data bit sequences into a plurality of data blocks according to a dual carrier modulation, to map the plurality of data blocks to a plurality of spatial streams according to a space-time diversity scheme, and to transmit a MIMO transmission based on the plurality of spatial streams.