Αξιολόγηση επίδοσης δεκτών για ασύρματα συστήματα πολλαπλών εισόδων πολλαπλών εξόδων (ΜΙΜΟ)
SubjectMIMO systems ; Wireless communication systems ; Radio relay systems ; Επεξεργασία σημάτων ; Αλγόριθμοι ; Capacity ; Receiver ; Spatial multiplexing ; Zero forcing
The purpose of this thesis is to evaluate the performance of six receivers for multiple input – multiple output (MIMO) spatial multiplexing systems. Initially, we present the evolution of wireless communications which has prompted the scientific community in finding new methods for increasing reliability and capacity of wireless links. Following are the basic theoretical principles upon which the MIMO technique is based. Afterwards we present a brief description of the impact that the use of this technique has on the capacity of wireless links. In the main part of this thesis we present the operation of the six different spatial multiplexing receivers. Their performance is evaluated with the use of simulations of their operation that are implemented in Matlab. We study the bit error rate that occurs in the transmission of data through a flat fading Rayleigh wireless channel with the use of MQAM modulation for a signal to interference ratio of 0 to 20 dB. Finally we present a performance comparison between the different receivers for the simultaneous decoding of the same signal that passes through the MIMO wireless channel.