Abstract:
Modern Trends in communication systems necessitate higher data rates and increased reliability. 4th Generation wireless systems & protocols are targeting to achieve these objectives by using different techniques, the most important of which is appending spatial dimension to the system by using multiple antennas both at the transmitter and receiver, i.e. Multiple Input Multiple Output (MIMO) systems.
We have developed a baseline LTE 2x2 system, i.e. a transmitter and receiver equipped with two antennas each. System employs the basic features of the physical layer of LTE, i.e. BICM combined with OFDM scheme as mentioned in the standardization document 3GPP TS 36.211 V8.6.0 (2009-03).
Transmission from the two transmit antennas is based on spatial multiplexing, i.e. two spatial streams will be transmitted. It enhances the data rate as compared to SISO (single input single output) system. For reception, we focused on Linear Receiver such as ZF & MMSE as well as Optimal receiver such as MAX Log MAP.
The project was initially developed in MATLAB / GNU radio. In the second phase, it is implemented on USRP kits & can act as test bed for different receiver structures.