SISO OFDM System in MIMO Relays
"Explore the implementation of the SISO part in MIMO relays, focusing on the background, simulation results, and future work. Learn about the SISO OFDM system, its algorithm, disadvantages, and transmitter block diagram. Discover D-OFDM and filtering in MIMO relay sequences, alongside simulation results and more."
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Presentation Transcript
Implementation of SISO part in MIMO relays Presenter: Xushen Han 1
Outline Background Background SISO OFDM system SISO OFDM system Simulation results Simulation results Future work Future work 2 2
Background The SISO ODFM transmission is an essential part in each time slot in our MIMO system. [3,4] [1,3,4] [3] [3] [4] [1] [4] [1] [2,3] [2] [2] [2,4] [1,2]
Outline Background Background SISO OFDM system SISO OFDM system Simulation Simulation results results Future work Future work 2 2
SISO OFDM system The algorithm of OFDM: IFFT Tb 1/Tb Serial to parallel 2/Tb 1/8Tb=f 8Tb 9/(8Tb) 1/8Tb=f 8Tb 1/8Tb=f 8Tb 2 7 ( ) t ( ) k 7 ( ) f ( ) ( ) = n t j k = F = sinc / X A f f nf N x x e 1/8Tb=f n 8Tb 0 = n 0 1/8Tb=f 2 N ( ) k 7 8Tb j kn = n X x ( n ) e 0 1/8Tb=f 8Tb 1/8Tb=f 8Tb 1/8Tb=f 8Tb Thanks to Su Zhang. Fundamentals and Implementation of OFDM Modulator 5
SISO OFDM system Disadvantage of OFDM : the transmission delay will have bad influence on the FFT in receiver Solution: cyclic prefix
SISO OFDM system OFDM transmitter block diagram Make Serial to Parallel Bits generation 4QAM Add pilot tones The receiver part will be an inverse process Add Cyclic Prefix Make Parallel to Serial Add synchronous Sequence IFFT 7
SISO OFDM system D-OFDM and filter in MIMO relay Sequences we want S Transmitting sequence IFFT S filter Transmitting sequence FFT We need to focus on it
Outline Background Background SISO SISO OFDM OFDM system system Simulation Simulation results results Future Future work work 2 2
Simulation result It is great honor for me to show our SISO OFDM simulation in face of all of you.
Outline Background Background SISO SISO OFDM OFDM system system Simulation Simulation results results Future Future work work 2 2
Future work There are still some challenges for my colleagues and me [1,3,4] [3] [1] MIMO relay [1] [2,3] [2] filter [1,2]
Q & A Q & A 13
Pilot Use the Pilot to calculate the channel characteristics 1 h h h R R R T T T P P P P P P 0 , 0 , 0 , 0 0 , 0 , 0 , 0 m qm m qm 0 , 0 h , 0 , 0 m qm h h R R R T T T P P P P P P 0 , n , , 0 , n , , n m n qm n m n qm 0 , n , , n m n qm = h h h R R R T T T P P P P P P 0 , , , 0 , , , pn pn m pn qm pn pn m pn qm 0 , , , pn pn m pn qm 14
add synchronous sequence The synchronous sequence is an sequence whose correlation function is a ? function If the value of the correlation function is so big, then the start point has been spotted
Q & A What kinds of filter would you use? square-root raised cosine roll off filter 16
Thank you! 17
