Quadrature Spatial Modulation for High Data Rate Wireless
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Solution Overview
Problem
Conventional MIMO systems face limitations in data rate enhancement due to their reliance on single-dimensional spatial modulation, leading to increased system complexity, inter-channel interference, and higher energy consumption, while space modulation techniques offer limited data rate improvements proportional to the number of transmit antennas.
Innovation Solution
The system extends spatial modulation to both in-phase and quadrature dimensions, allowing for increased data transmission rates by utilizing both components of spatial constellation symbols, thereby enhancing spectral efficiency without increasing system complexity or degrading performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional MIMO systems use multiple active RF chains and antennas to increase data throughput, then data transmission rate is improved, but system complexity and energy consumption increase linearly
Solution Approach 1:
The patent extends spatial modulation from single-dimensional (real part only) to two-dimensional by utilizing both in-phase and quadrature components of spatial constellation symbols. This dimensional expansion allows doubling the data rate without adding more antennas or RF chains, thereby improving productivity while maintaining device complexity at acceptable levels
2Productivity
If conventional MIMO systems use multiple active antennas to achieve array gain, then spectral efficiency is improved, but inter-channel interference increases
Solution Approach 1:
The patent extracts and utilizes the quadrature component of spatial modulation that was previously unused in conventional systems. By taking out this additional dimension of information transmission, the system achieves higher spectral efficiency without requiring additional active antennas that would generate inter-channel interference
3Productivity
If space modulation techniques use more transmit antennas to increase data rate, then data rate enhancement is improved, but the data rate is still limited to logarithmic scaling
Solution Approach 1:
The patent applies dimensional change by utilizing both in-phase and quadrature components of spatial constellation symbols. This allows the system to double the data rate enhancement without increasing the number of transmit antennas, breaking the logarithmic scaling limitation of conventional space modulation techniques
4Device complexity
If conventional space modulation uses only the real part of spatial constellation, then system complexity is reduced, but data transmission rate is limited
Solution Approach 1:
The patent extends the utilization of spatial constellation from one dimension (real part only) to two dimensions by incorporating both in-phase and quadrature components. This dimensional expansion doubles the data transmission rate while maintaining relatively low system complexity, as no additional hardware is required
Data Source
AI summary
The invention is directed to systems and methods for quadrature spatial modulation in the transmission of over a wireless network. A plurality of transmit antennas are configured in a spaced apart configuration, with each antenna representative of a spatial constellation symbol comprising an in-phase component and a quadrature component. A transmission unit is configured to map source data to the spatial constellation symbol of the transmit antennas, and to transmit a carrier signal comprising the in-phase and quadrature components out of phase. At least one receiving antenna is configured to receive the carrier signal, and at least one receiving unit is configured to demodulate the carrier signal to generate the source data.