Code design for MIMO downlink with imperfect CSIT

—In this letter, we implement a simplified version of the Cover - van der Meulen - Hajek - Pursley (CMHP) coding originally characterized by Wajcer, Wiesel, and Shamai. The vector Gaussian broadcast channel with imperfect channel state information at the transmitter (CSIT) is considered where the transmitter only knows the channel mean and variance. Our focus is on the implementation and performance analysis of CMHP under the imperfect CSIT model using practical codes. Turbo codes described in IEEE 802.20 draft specification and quadrature amplitude modulation are used to implement CMHP. In order to find the optimal power allocation and beamforming vectors which maximize the sum rate with practical codes, we introduce the SINR penalty factor. The SNRs that achieve various target spectral efficiency are presented and analyzed.

• Type: Journal
• Year: 2010
• Where: TCOM
• Authors: Hyung-Tae Kim, Sung Hoon Lim, Inkyu Lee, Saejoon Kim, Sae-Young Chung
• Keywords: Gaussian Broadcast Channel, Imperfect Channel State, Practical Codes, TCOM 2010