SPATIAL-MODULATION BASED
COMMUNICATION SYSTEM
PERFORMANCE INVESTIGATION AND SIMULATION
Mohammad AlFlahat
Khaled Aboor
Ramzi AlSuss
Dr Yazid Khattabi
MOTIVATION
• System Y has:
– Much better BER performance
– Same bandwidth as X
– 5x The bit rate of X
– 80% Less transmitted energy
– No ICI
CONVENTIONAL
MIMO SYSTEMS
A. Spatial Multiplexing
B.
Space Time Coding (STC)
ADVANTAGES OF SPATIAL MODULATION
One active transmitter antenna at a time (one RF chain) yields:
1.
No inter channel interference
2.
Higher spectral efficiency than STC and SISO systems
3.
Energy efficient
4.
Less complex than other MIMO systems
HOW SM WORKS?
At the Transmitter
Example: 2x1 QPSK SM system
HOW SM WORKS?
From the Transmitter to the Receiver
Example: 2x1 QPSK SM system
HOW SM WORKS?
At the Receiver
Example: 2x1 QPSK SM system
DRAWBACKS OF SPATIAL MODULATION
1.
Depends thoroughly on the surrounding transmission environment
2.
High switching speed among transmitter antennas
3.
Lower bit rate than Spatial Multiplexing systems
PERFORMANCE INVESTIGATION
AND SIMULATION
METHODOLOGY
SIMULATION OVERVIEW
• Message: random sequence of 0’s and 1’s
• Rayleigh fading coefficients: ℎ =
1
𝑁
2
• Noise Spectral Power Density: 𝑁0 =
• Noise values: 𝑛 =
𝑁0
𝑁
2
0,1 + 𝑗
0,1 + 𝑗
1
𝑁
2
𝐸𝑆
100.1×𝑆𝑁𝑅𝑑𝐵
𝑁0
𝑁
2
0,1
• Received symbols: 𝑅(𝑖) = 𝑇(𝑖) × ℎ(𝑖) + 𝑛(𝑖)
0,1
NEW CODE VS OLD CODE
New code:
Old codes:
• Any number of Tx & Rx antennas
• Any modulation order M
• Specific to a certain system and
modulation order
• Significantly faster
• Slower
• Can simulate SISO and SM-MIMO
systems
SM-MIMO Systems
Simulation vs Theory
SM-MIMO Systems
Simulation vs Theory
SM-MIMO Systems
Simulation vs Theory
Effect of Adding More Rx Antennas
OPENING EXAMPLE
The 16x4 BPSK SM-MIMO system has:
–Much better BER performance
–Same bandwidth as BPSK SISO
–5x The bit rate of SISO
–80% Less transmitted energy
–No ICI
HARDWARE DEMONSTRATION
Implementation of VLC In This Demo
(Free Space Optical Communication)
Hardware Components
EXAMPLE ON OPERATION
THANK YOU
Students:
Advisor:
Mohammad AlFlahat
Dr.Yazid Khattabi
Ramzi AlSuss
Khaled Aboor