MIMO System Prototyping Prototyping is key to understanding the operation of real-world wireless systems. It provides access to real propagation channels and better simulations impairments such as amplifier nonlinear, gain/phase offset, quantization effects, and timing jitter that are often overlooked in simulations. To obtain the benefits from studying these effects, we have built several prototypes to study topics such as MIMO-OFDM communication and MIMO ad hoc networking. Click on the … Continue reading →

Cellular system deployment has reached practical limits in many dense urban area while data traffic only continues to increase. This leaves cellular operators with few options to increase the most important metric: area spectral efficiency. Unfortunately, radio link improvements including coding, cognitive transmission, and multiple antennas are reaching their theoretical limits. Consequently, network operators are revisiting conventional cellular system topologies and are considering a new paradigm called heterogeneous networks. Heterogeneous … Continue reading →