Spatial Modulation Techniques in MIMO Communication Systems
Summary
Spatial modulation (SM) represents a transformative approach within multiple-input multiple-output (MIMO) communications, in which information is conveyed not only by conventional signal constellations but also by the choice of transmit antenna. By activating a single antenna per symbol interval, SM inherently avoids inter-channel interference and dramatically reduces the number of required radio-frequency (RF) chains, yielding lower hardware complexity and energy consumption. Variants such as generalized spatial modulation (GSM) and enhanced spatial modulation exploit multiple active antennas or higher-order antenna pattern libraries to trade off between diversity and multiplexing gains. Space-time shift keying (STSK) further extends this concept by embedding information in dispersion matrices, thereby achieving both spatial and temporal diversity. Differential SM schemes dispense with explicit channel estimation by encoding information across successive transmissions, which is advantageous in high-mobility or rapidly varying channels. Recent advances focus on reconfigurable antennas, index-modulation adaptivity and low-complexity detection algorithms that promote scalability to large-scale MIMO and millimetre-wave deployments. Collectively, these techniques underpin energy-efficient, high-throughput wireless links with robust performance across a range of propagation environments.
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Spatial Modulation Techniques in MIMO Communication Systems publication trend
The graph below shows the total number of articles in spatial modulation techniques in mimo communication systems across all publications each year (not limited to Nature Index journals).
Technical terms
Spatial Modulation (SM): A scheme that conveys information via the index of the active transmit antenna in addition to conventional signal symbols.
Multiple-Input Multiple-Output (MIMO): A wireless technology using multiple transmit and receive antennas to improve spectral efficiency and link reliability.
Index Modulation: A paradigm in which certain indices (antenna, subcarrier or time-slot) carry additional information, enhancing overall data throughput.
Space-Time Shift Keying (STSK): A modulation format encoding information in predesigned dispersion matrices that span both spatial and temporal dimensions.
Compressive Sensing: A signal processing method that reconstructs sparse signals from a reduced number of measurements, applied here to lower detection complexity.
RF Chain: The hardware components (including mixers, filters and amplifiers) required to process one transmit or receive antenna signal.
References
- Low-Complexity Compressive Sensing Detection for Spatial Modulation in Large-Scale Multiple Access Channels. IEEE Transactions on Communications (2015).
- Sixty Years of Coherent Versus Non-Coherent Tradeoffs and the Road From 5G to Wireless Futures. IEEE Access (2019).
- Spatial modulation based on reconfigurable antennas: performance evaluation by using the prototype of a reconfigurable antenna. EURASIP Journal on Wireless Communications and Networking (2019).
- Finite-Cardinality Single-RF Differential Space-Time Modulation for Improving the Diversity-Throughput Tradeoff. IEEE Transactions on Communications (2018).
- Multi-Set Space-Time Shift-Keying With Reduced Detection Complexity. IEEE Access (2016).
- Adaptive generalized space shift keying. EURASIP Journal on Wireless Communications and Networking (2013).
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