Multiuser receiver for PUCCH signaling with transmit diversity

This paper deals with a transmit diversity scheme to be applied in multiple-antenna signaling over the physical uplink control channel (PUCCH) of 3GPP LTE-Advanced (Release 10). Taking into account the signaling structure of this system, we show that received signal at the base station can be modeled using a tensor decomposition with constraints imposed on the control symbol matrix. By exploiting the proposed tensor model and its known structure, a receiver for joint multiuser channel estimation and detection is presented. The receiver is based on a semi-blind algorithm, by using known reference control symbols at the first iteration, and then proceeding with a data-aided channel and symbol estimation in subsequent iterations. Numerical results from Monte Carlo simulations are provided for performance assessment.