High Data Rate Wireless Communications Using CMOS

December 1, 2006
Time: 2:00pm-3:00pm
Interschool Lab - 7th Floor - CEPSR
Hosted by: Columbia Integrated Systems Lab
Speaker: Dr. Yorgos Palaskas, Intel Corporation, Hillsboro, OR


This talk presents wireless technologies that can achieve high data rates (0.1-5 Gb/s) and are amenable to CMOS integration. The first technology discussed uses multiple antennas (MIMO) and spatial multiplexing to obtain high data rates by re-using a limited RF bandwidth. In spatial multiplexing MIMO, independent data streams are transmitted from the different transmit antennas. These data streams merge in the wireless channel but the receiver can still separate them by using advanced DSP techniques. The talk discusses the implications of MIMO processing to the RFIC design. It is shown that crosstalk between the multiple transceivers residing on the same die can degrade the MIMO performance and has to be carefully minimized, especially when power amplifiers are integrated on-die. A 5GHz 2x2 MIMO prototype has been fabricated and tested to demonstrate these ideas. The transceiver includes linearized integrated power amplifiers that deliver a 1-dB compression point power of 20.5dBm. The MIMO transceiver achieves a data rate of 108Mb/s, which is double what conventional single-antenna WLAN technology can achieve within the same RF bandwidth, demonstrating the spectral efficiency advantage of MIMO spatial multiplexing. Even higher data rates can be achieved by using abundant, underutilized RF bandwidth available at mm-wave frequencies (e.g. 60GHz). Wireless communications at mm-wave frequencies present severe challenges due to increased path loss, deteriorating transistor performance, and packaging complications. These issues might be offset by the large RF bandwidths available and the small antenna size that might allow the deployment of antenna arrays to help restore the performance of the overall system. The challenges and opportunities of mm-wave transceivers are reviewed and some first experimental results are reported.

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