Capacity enhancement and design analysis of UWB MIMO OFDM over SISO system using microstrip antennas

Abstract

Multiple-Input Multiple-Output (MIMO) systems offer high capacity to wireless systems over a SISO system and the capacity increases linearly with the number of transmitting antennas as long as the number of receiving antenna s is greater than or equal to the number of transmitting antenna s. OFDM based Ultra Wideband (UWB) system combines OFDM modulation technique with a multi banding approach, which divides the spectrum into several sub-bands, whose bandwidth is approximately 528 MHz. It is a popular method for h igh data rate wireless communications. MIMO techniques promi se a significant boost in the performance of OFDM system s as compared to SISO systems. In this paper, a novel de sign UWB MIMO OFDM system using a compact double-sided print ed antenna having ultra-wideband and band-notched char acteristic is proposed and its capacity enhancement over the c onventional SISO system is shown. The UWB antennas are designed on CST Microwave studio simulation software with return lo ss less than -10dB, and further using the results from CST, the d ata throughput for both single and multiple antenna sys tem is compared for performance analysis. The MIMO UWB ant ennas are designed using polarization diversity of the in dividual antennas. The performance curves of both the system s are analyzed for capacity enhancement. The transmitting bandwidth is UWB (i.e. 3.1-10.6 GHz) and the receiving bandwi dth is notch UWB (notch bandwidth 5-5.9 GHz) are chosen to reduc e the interference at the receiver side for both the syst ems. Furthermore, the systems are designed at a frequenc y of 9.4 GHz that is used for micro power radar application in t he ultra wideband removing the interference from WLAN band. Keywords-Band-notched, Bit Error Rate (BER); Doubl e-sided Printed; Multiple Input Multiple Output (MIMO); Ort hogonal Frequency Division Multiplexing (OFDM); Single Inpu t Single Output (SISO).

A dual band stacked aperture coupled antenna array for WLAN applications

“…The multiple antennas used in the wireless communication link helps in combat fading. In this way, the data rate can be improved . In the context to the same, in this article the design of a dual band aperture coupled stacked antenna array is presented.…”