Spatial Modulation Using Multiple Antenna Sequences
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Solution Overview
Problem
The existing spatial modulation schemes in wireless communication systems, such as 3GPP LTE, suffer from antenna-specific errors and lower transmission rates compared to spatial multiplexing, particularly in massive MIMO systems, where the performance is often limited by poor channel conditions and reduced diversity gain.
Innovation Solution
A method is introduced where information is spatially modulated based on the selection of multiple antennas, with specific sequences representing different information units, and the use of linear combinations of QAM symbols, allowing for efficient transmission and demodulation without antenna-specific errors, and combining with schemes like Alamouti and QAM to enhance transmission rates and diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spatial modulation scheme is used to reduce complexity and energy consumption, then device complexity and energy use are reduced, but transmission rate and diversity gain deteriorate
Solution Approach 1:
The patent transitions from traditional single-antenna spatial modulation to multi-antenna spatial modulation, adding a spatial dimension to the modulation scheme. By selecting multiple antennas simultaneously and using different sequences for different information units, the system increases the dimensionality of the modulation space, thereby提高 transmission rate while maintaining the low complexity advantage of spatial modulation.
Solution Approach 2:
The patent segments the transmission process by dividing information into multiple information units, each transmitted through different antenna sequences. This segmentation allows parallel transmission of multiple data streams through different antenna combinations, increasing overall transmission rate while keeping individual transmission paths simple and low-complexity.
2Device complexity
If spatial modulation is used to achieve low detection complexity, then receiver complexity is reduced, but antenna-specific errors increase
Solution Approach 1:
The patent merges multiple antenna transmissions into a unified spatial modulation framework. By combining signals from multiple antennas using predetermined sequences and applying linear combination techniques, the system achieves diversity gain that mitigates antenna-specific errors while maintaining low detection complexity through sequence-based identification rather than complex signal separation.
Solution Approach 2:
The patent creates a composite transmission scheme by combining spatial modulation with sequence coding and linear combination techniques. This composite approach layers multiple error-mitigation mechanisms (spatial diversity, sequence orthogonality, linear combination processing) to reduce antenna-specific errors while preserving the fundamental low-complexity advantage of spatial modulation.
3Device complexity
If traditional spatial modulation is used to simplify the transmission system, then system complexity is reduced, but diversity gain is limited
Solution Approach 1:
The patent introduces dynamic antenna selection and sequence assignment mechanisms. Instead of fixed antenna mappings, the system dynamically selects which antennas to use and what sequences to assign based on channel conditions and information requirements. This dynamics enables adaptive diversity gain while maintaining system simplicity through standardized selection algorithms.
Data Source
AI summary
Disclosed is a method of transmitting signals by a transmitting side device having multiple antennas. In this method, the transmitting side device spatially modulates information to be transmitted, where the information is spatially modulated to be represented based on which antennas among the N antennas are selected to be used for transmission. And, the transmitting side device transmits the spatially modulated information through the selected antennas. Here, the number of the selected antennas for transmitting one transmission information unit (hereinafter, ‘M’ where M≤N) is plural. And, different sequence of the selected antennas represents different information to be transmitted.