Recently standardized wireless systems have multiple Time-Slots in a radio frame, but existing MUMIMO schedulers are not utilizing multiple Time-Slots efficiently. In this paper we propose a sub-optimal user grouping algorithm utilizing multiple Time-Slots efficiently. The proposed algorithm disperses highly-correlated users in different Time-Slots to prevent severe degradation of spatial multi...

Multiple-input-multiple-output (MIMO) wireless systems can not always have full spatial multiplexing gain due to the channel correlation problem caused by various factors such as the coupled antenna elements, and the key-hole effect of the propagation environment. In this paper, we proposed a channel reconfiguration technique to combat the rank deficiency problem of the involved MIMO wireless c...

In this report we show how proper cooperation among radio nodes may provide diversity gain, also for single antenna systems. We consider first the connectivity of a wireless network and show how it can benefit from cooperation. Then, we consider some specific forms of cooperations, based on distributed space-time coding, in both single and multi-user contexts. Finally, we pay a special attentio...

A multiple-input multiple-output (MIMO) wireless channel formed by antenna arrays at the transmitter and at the receiver offers high capacity and significant diversity. Linear precoding may be used, along with spatial multiplexing (SM) or space-time block coding (STBC), to realize these gains with low-complexity receivers. In the absence of perfect channel knowledge at the transmitter, the prec...

ABSTRACT Multiple Input Multiple Output (MIMO) technology is going to be a viable alternative for future generation wireless broadband services in order to meet the striving requirements for throughput and system robustness. In Long Term Evolution (LTE), MIMO technologies have been broadly used to get better downlink peak rate, cell coverage, as well as average cell throughput. In the present p...

In this paper, we analyze the performance of bit interleaved coded multiple beamforming (BICMB). We provide interleaver design criteria such that the resulting system achieves full spatial multiplexing of min(N, M) and full spatial diversity of NM for a system with N transmit and M receive antennas. We combined BICMB with OFDM in order to combat ISI caused by the frequency selective channels. T...