We study the performance of differential spacetime codes with linear constellation precoding (LCP) for orthogonal frequency division multiplexing (OFDM) cooperative networks over frequency selective channels. Through exploiting the unitary structure of the orthogonal STBCs, we design a low complexity differential STBC-LCP-OFDM receiver for cooperative networks. We assume the amplify-and-forward...

of Thesis presented to UFSC as a partial fulfillment of the requirements for the degree of Doctor in Electrical Engineering NEW PRECODING AND EQUALIZATION TECHNIQUES FOR MULTICARRIER SYSTEMS

Precoding techniques are used in the downlink of multiuser multiple-input multiple-output (MIMO) systems in order to separate the information data streams aimed at scattered user terminals. Vector precoding (VP) is one of the most promising non-linear precoding schemes, which achieves a performance close to the optimum albeit impractical dirty paper coding (DPC) with a feasible complexity. This...

In this contribution we propose a low-complexity fair scheduling algorithm for wireless multi-user MIMO communication systems in which users are multiplexed via time-, frequency-, and space-division multiple access schemes, TDMA, FDMA, and SDMA, respectively. In such systems, the transmission quality degrades considerably if users with spatially correlated channels are scheduled to be served at...

Full-rate (FR) and full-diversity (FD) are attractive features in MIMO systems. We refer to systems which achieve both FR and FD simultaneously as FRFD systems. Nonorthogonal STBCs can achieve FRFD without feedback, but their ML decoding complexities are high. V-BLAST without precoding achieves FR but not FD. FRFD can be achieved in VBLAST through precoding given full channel state information ...

High spectral efficiency can be achieved in the downlink of multi-antenna coordinated multi-point systems provided that the multiuser interference is appropriately managed at the transmitter side. For this sake, downlink channel information needs to be sent back by the users, thus reducing the rate available at the uplink channel. The amount and type of feedback information required has been ex...