Space-time processing for multiple access applied to indoor environments.

摘要

This thesis presents the design and verification of the physical layer for a practical 128-Mbps, 20-MHz, indoor wireless network intended to simultaneously communicate with 32 users over a 5.6-GHz carrier.; The system is implemented using a bi-directional space-time filter distributed among the access point (AP) and user terminals (UT). This design allows the AP to significantly correct for a variety of channel quality variations thus preventing the BER from exceeding 10-3.; An extensive set of experimental wireless channel measurements emulating a multi-user network while using a compact, custom-designed circular array are compared with current spatial channel models and the results are applied to the space-time algorithm showing a doubling in spectral efficiency.; Finally, intending the system to be implemented in a 0.18-mum CMOS technology, the digital requirements of key functional communication blocks is considered. This analysis shows that the UT decorrelator can be implemented with only a 2-mW power consumption.