Call For Paper Volume:4 Issue:8 Aug'2017 |

Performance Analysis of Digital Modulation Techniques using MIMO-OFDM System and V-Blast Algorithm for Multi User Detection

Publication Date : 19/06/2015



Author(s) :

KEROLIN K. SHAH , RITESH G. PATANKAR , HITESH D. PANCHAL.


Volume/Issue :
Volume 2
,
Issue 6
(06 - 2015)



Abstract :

This paper is aimed at analyzing the Bit Error Rate performance of the Orthogonal Frequency Division Multiplexing (OFDM) system in Multi-Input Multi-Output (MIMO) environment for increasing the transmission capacity and improving the spectrum efficiency for wireless communication by varying number of users. The main motivation for using OFDM in a MIMO channel is the fact that OFDM modulation turns a frequency-selective channel into a set of parallel-flat frequency MIMO channel, in order to achieve the efficient usage of the available bandwidth. Multi-user Detection (MUD) is the intelligent estimation of transmitted bits in the presence of Multiple Access Interference (MAI).Conventional detectors based on the matched filter just treat the MAI as additive white Gaussian noise (AWGN).  However, unlike AWGN, MAI has a nice correlative structure quantified by the cross-correlation matrix of the signature sequences.  Hence, detectors that take into account this correlation would perform better than the conventional matched filter-bank. MUD is basically the design of signal processing algorithms. These algorithms take into account the correlative structure of the MAI. This paper deals with the possible analysis of various digital modulation techniques such as QPSK, 16 QAM and 64 QAM. These are compared based on their Minimum Bit Error Rates (MBER) to their corresponding Signal to Noise Ratio (SNR) values and best promising combination is proposed.  In this analysis, MIMO-OFDM based Wireless Communication System considers using MMSE (Minimum Mean Square Error) and V-BLAST (Vertical Bell Laboratories layered Space-Time) technique. We compare results for Rayleigh Channel.


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Performance Analysis of Digital Modulation Techniques using MIMO-OFDM System and V-Blast Algorithm for Multi User Detection

June 17, 2015