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Prototyping of wireless radio is very important to demonstrate the features of any wireless radio before deployment. The core implementation stages of wireless radio prototype include physical layer digital baseband (DBB) processing, RF transceiver chip configuration and interfacing of baseband and RF. Flexibility and adaptivity are very much required in MIMO-OFDM based realtime prototypes, which...
Our objective is to design, analyze, prototype and experimentally study the theoretical underpinnings for a wireless internet that simultaneously achieves deployability, scalability, high performance and a cost-effective economic model. A core building block will be what we call wireless Transit Access Points. A transit access point, or TAP, is a wireless base station with two major features. First,...
CubeSat is a class of popular pico-satellites that is limited in size to a standard 10×10×10cm unit. In this paper, we present a functioning High Data Rate (HDR) 2.4 GHz radio for use on a CubeSat. Current CubeSats suffer from low data rate radios and this severely limits their functionality. In this design, the operating constraints of a CubeSat have been addressed. Namely, power, wide variations...
This paper presents a baseband and RF transceiver at 5.2-GHz band for wireless LAN systems. The baseband unit supports 2×2 MIMO-OFDM with an 80-MHz channel and provides the maximum data rate of 600 Mbps. The wider channel of 80 MHz is a candidate technology for the next WLAN standardization of IEEE802.11ac. OFDM tends to cause high peak PAPR for the wider channel and distort power amplifier performance...
The IEEE802.11ac task group has started to establish a next-generation WLAN standard. The wider channel of more than 80 MHz achieving over a 1-Gbps data rate is discussed. We have developed an experimental platform consisting of baseband and RF units in a 2×2 MIMO-OFDM system for the wider channel and evaluated its system performance in a field experiment. A MIMO-OFDM transceiver in the baseband unit...
In this paper we evaluate the real-time performance of a MIMO-enhanced 802.11a transceiver based on analog combining techniques. The aim of this transceiver design is to achieve higher performance than conventional 802.11a systems while keeping costs and power consumption similar. Also, the demonstrator used to carry out this evaluation is presented, as well as its implementation over a dual band...
In this paper the implementation of a configurable hardware for an UHF RF identification (RFID) tag emulator at 868 MHz is demonstrated. The tag emulator is used for reader performance verification under worst case conditions. The characteristics of a tag can precisely be emulated: reflection coefficient dependent on received signal strength, variation of the frequency, and timing jitter of the backscattered...
This paper has reported on the design and development of an FPGA based 2times2 MIMO testbed employing commercially available MAX289 RF transceiver chips and in-house developed antennas. Details of the operation of various parts of this system have been described. A particular attention has been paid to symbol synchronization which is crucial to achieving the data demodulation, channel estimation,...
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