A Low Complexity MMSE Detector for Multiuser Layered Space-Time Coded MIMO Systems

2007 ◽  
Author(s):  
May Gomaa ◽  
Ali Ghrayeb
Keyword(s):  
Mimo Systems ◽  
Low Complexity ◽  
Space Time ◽  
Mmse Detector

scholarly journals Enhancement of Twice Quasi Orthogonal Space Time Block Coded (QOSTBC) Performance System with Zero Forcing EVCM Decoder

2018 ◽  
Vol 218 ◽  
pp. 03009
Author(s):  
Desy Agustin ◽  
Nachwan Mufti Adriansyah ◽  
Muhsin
Keyword(s):  
Mimo Systems ◽  
Mimo System ◽  
High Reliability ◽  
Multiple Input Multiple Output ◽  
Low Complexity ◽  
Space Time ◽  
Zero Forcing ◽  
Receiver Diversity ◽  
Multiple Input ◽  
Input Multiple Output

In today’s modern telecommunications systems, makes the number of studies and development of multiple antennas and multiple-input multiple-output (MIMO) systems to achieve high reliability and low complexity. One attractive approach to improve that performance is using technique transmit diversity which is spacetime block coding and receiver diversity i.e. zero forcing EVCM (ZF EVCM). Although some earlier MIMO standards were develop some space-time codes like (O-STBC)and (Q-OSTBC) to provide high reliability but they are limited able to achieve orthogonality. In this research will be proposed a MIMO system scheme which is an improvement of QOSTBC that used a transmission diversity technique. This improvement from QOSTBC is Twice QOSTBC uses a provision in two codeword matrices to be sent are arranged diagonally so as to have higher levels of orthogonality. In this case Twice QOSTBC highly structured (4x1) can be replaced as an equivalent EVCM channel H. The proposed Twice-QOSTBC’s results outperform other QOSTBC techniques with a difference around 3 dB for single-input multi-input (MISO) input configuration at 10-6 BER and receiver ZF EVCM has a very similar structure as the code matrix S of the underlying Twice QSTBC which can eliminates the system complexity.

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