Multi-stage beamforming codebook for 60GHz WPAN

Beamforming (BF) based on code book is regarded as an attractive solution to resolve the poor link budget of millimeter-wave 60GHz wireless communication. Because the number of the elements of antenna array in 60GHz increases, the beam patterns generated are more than common BF, and it causes long set-up time during beam patterns searching. In order to reduce the set-uptime, three stages protocol, namely the device (DEV) to DEV linking, sector-level searching and beam-level searching has been adopted by the IEEE 802.15.3c as an optional functionality to realize Gbps communication systems. However, it is still a challenge to create code book of different patterns to support three stages protocol from common code book of beam pattern. In this paper, we proposes a multi-stage code book design and the realization architecture to support three stages BF. The multi-stage code book can create different granularity of beam patterns and realize progressive searching. Simulation results for eight elements uniformline ararray (ULA) show that this design can divide the beam searching to three stages searching without increasing the system complexity.