Learn More
—Distributed space time coding can achieve full spatial diversity in wireless relay networks. However, it requires accurate symbol-level synchronization and priori coordination between cooperative relay terminals, which is difficult to implement in distributed networks. In this paper, we propose a novel scheme based on interleaving to achieve cooperative(More)
Interference alignment increases transmission rate in terms of multiplexing gain for X channel. In this paper, we propose a fixed-rate transmission scheme over a two-user X channel where each of the two double-antenna transmitters has independent messages for each of the two double-antenna receivers. Each transmitter encodes symbols using Alamouti codes(More)
—A wireless massive MIMO system entails a large number (tens or hundreds) of base station antennas serving a much smaller number of users, with large gains in spectral-efficiency and energy-efficiency compared with conventional MIMO technology. Until recently it was believed that in multi-cellular massive MIMO system, even in the asymptotic regime, as the(More)
Interference alignment (IA) was shown to be effective for interference management in improving transmission rate in terms of the degree of freedom (DoF) gain. On the other hand, orthogonal space-time block codes were widely used in point-to-point multiantenna channels to enhance transmission reliability in terms of the diversity gain. In this paper, we(More)
We study multiuser transmission and detection schemes for a multi-access relay network (MARN) with linear constraints at all nodes. In a (J, J a , R a , M) MARN, J sources, each equipped with J a antennas, communicate to one M-antenna destination through one R a-antenna relay. A new protocol called IC-Relay-TDMA is proposed which takes two phases. During(More)
This paper considers transmission schemes in multiaccess relay networks (MARNs) where <i>J</i> single-antenna sources send independent information to one <i>N</i>-antenna destination through one <i>M</i>-antenna relay. For complexity considerations, we propose a linear framework, where the relay linearly transforms its received signals to generate the(More)
The fundamental performance limits of space-time block code (STBC) designs when perfect channel information is available at the transmitter (CSIT) are studied in this report. With CSIT, the transmitter can perform various techniques such as rate adaption, power allocation, or beamforming. Previously, the exploration of these fundamental results assumed(More)
A large scale antenna system (LSAS) entails a large number of base station (BS) antennas serving a much smaller number of terminals. LSAS demonstrates large gain in spectral-efficiency and energy-efficiency compared with conventional MIMO schemes. In the regime of infinite number of BS antennas, the performance of LSAS can be improved unboundedly by using a(More)