Yongxing Zhou

Practical Codebook Design for Limited Feedback Spatial Multiplexing

Codebook design for limited feedback Spatial Multiplexing commonly relies on the assumption of i.i.d. Rayleigh fading. It is well known that realistic MIMO channels may exhibit large correlation and/or dominant components and that antennas could be dual-polarized. Hence there is much appeal to come up with design criteria that can cope with such a large distribution of propagation conditions. In this paper, efficient ways to design high-performance and low-complexity codebooks for limited feedback-based Spatial Multiplexing evolving in various environments are provided. In particular, new design criteria are derived for transmit correlated and dual-polarized scenarios. Some of the codebook structures derived in this paper are components of the codebooks accepted in 3GPP LTE. Simulation examples are provided to confirm the proposed criteria.

Flexible Multi-User MIMO with Limited Feedback

In a Multi-User MIMO (MU-MIMO) spatial multiplexing scheme, multiple users are scheduled in the same resource block (RB). However, due to the wide fluctuation of realistic traffic patterns, it could often occur that only a single or few users have active data that need to be sent. In 3GPP Long Term Evolution (LTE), Single-User MIMO (SU-MIMO) rank one preceding based Channel Quality Indicator (CQI) reporting mechanism is reused for MU-MIMO. This is optimum for MU-MIMO if single user is served. Based on SU-MIMO Rank one reporting, CQI re-calculations at the Basestation (BS) are derived for Space Division Multiple Access (SDMA) mode and Zero-Forcing (ZF) mode respectively. A novel flexible MU-MIMO scheme with rank and mode adaptation is thus proposed for the first time with this limited feedback information. Simulation examples are provided to confirm the advantage of proposed flexible MU-MIMO scheme over SU-MIMO with 3GPP LTE framework.