MIMO Capacity Analysis For Spatial Channel Model Scenarios

With the advancement of wireless communication and extensive research for new technologies for more reliable,secure and high speed connection,Multiple Input Multiple Output(MIMO)is coming up as the foremost competitor.In simple,MIMO is an arrangement of two or more antennas at the transmitter and receiver ends for sending and receiving data.It is more efficient at transmitting and receiving signals in contrast to conventional single antenna system.So,it improves and overcomes the restriction and problems related to single antenna systems.Particularly,in this thesis,we investigate MIMO system capacity using Spatial Channel Model(SCM)proposed by Third Generation Partnership Project(3GPP-3GPP2)standard for third generation systems and compare to one of physical model i.e.One Ring Channel Model.Also,we contrast with a theoretical model namely independent and identically distributed(i.i.d.)channel model.Firstly,we present a system model for investigating MIMO systems followed by detailed analysis of channel parameters and capacity analysis.A simulation tool is developed to estimate the capacity of Non Line of Sight(N-LOS)MIMO systems in SCM with scenario of multipath propagation.Further,it is compared with i.i.d.channel model and One Ring channel model.The study shows that the capacity of channel increases in almost linear fashion with addition of number of antennas,but the rate of linearity is higher in Waterfilling Power allocation scheme and lower in Equal Power allocation scheme.Secondary,for practical implementation,the compact MIMO systems are more desirable,so we investigate the effect of mutual coupling due to closely spaced antennas.The study shows that mutual coupling leads to increase in the capacity for which the spacing is less than approximately 0.4 times wavelength.During the evaluation of SCM,all three major scenario of environments viz: Sub Urban Macro Cell,Urban Macro Cell and Urban Micro Cell were considered separately.