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This paper considers a wireless communication system with multiple transmit and receive antennas, i.e., a multiple-input-multiple-output (MIMO) channel. The objective is to design the transmitter according to an imperfect channel estimate, where the errors are explicitly taken into account to obtain a robust design under the maximin or worst case(More)
— In this paper, we study the design of the transmitter in the downlink of a multiuser and multiantenna wireless communications system, considering the realistic scenario where only an imperfect estimate of the actual channel is available at both communication ends. Precisely, the actual channel is assumed to be inside an uncertainty region around the(More)
Providing femto-access points (FAPs) with computational capabilities will allow (either total or partial) offloading of highly demanding applications from smart-phones to the so called femto-cloud. Such offloading promises to be beneficial in terms of battery saving at the mobile terminal (MT) and/or in latency reduction in the execution of applications.(More)
Keywords: MIMO Testbeds IEEE 802.16e Real-time systems FPGAs DSP a b s t r a c t The IEEE 802.16e-2005 standard, also denoted as mobile WiMAX, was introduced as one of the first real efforts towards the deployment of fourth generation communication systems providing fixed and mobile broadband wireless access. Mobile WiMAX supports multiple input multiple(More)
This paper addresses the problem of the spatial scheduling of users in a cell for simultaneous downlink transmission from a Base Station (BS) having multiple antennas under a perspective of joint Physical and Medium Access Control (PHY-MAC) design. First of all, we compute the transmit beamvectors for each group according to a Zero Forcing (ZF) criterion,(More)
— In this paper we address the problem of the design of a power allocation strategy for an Orthogonal Frequency Division Multiplexing (OFDM) system. We assume no spatial diversity at the transmitter and receiver, that is, a Single-Input-Single-Output (SISO) channel is considered. The goal is to allocate all the available power at the transmitter among the(More)
— In this letter, we study spatial Tomlinson-Harashi-ma precoding (STHP) from an information theoretic point of view encompassing both the single and the multiuser scenarios. Since the performance of any communications precoding scheme relies on the quality of the channel state information (CSI) that is made available at the transmitter side, in this work(More)
In this paper we address the problem of joint transmitter and receiver optimization in a wireless multiuser MIMO-OFDM environment. We consider a centralized design strategy assuming that Channel State Information (CSI) is available. The optimization goal is the minimization of the total transmitted power subject to different constraints, such as the Quality(More)