In this paper, we investigate the capacity of spatially correlated, multiple-input–multiple-output (MIMO) channels in a 60 GHz indoor environment. We first derive the correlation coefficients between two antenna elements as a function of the antenna spacing. Then, the standard deviation of the power azimuth spectrum (PAS) and the mean angle of arrival (AOA) are obtained for the truncated Laplac...

This paper presents a new joint channel estimation method for Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) systems based on a Singular Value Decomposition (SVD) reduced-rank technique. The system capacity is increased by increasing the highest number of users in one time slot. The additional channel estimation processing required for the increasing number of users is solve...

Grounded in social-contractual ideas about relationships between the governed and those who govern, provision of social benefits to citizens has historically been predicated on expectations acquiescence state authority. However, rapid expansion noncontributory assistance sub-Saharan Africa, often supported by global donors through technical programs, raises myriad questions relationship protect...

background in recent times, there has been a growing demand internationally for health policies to be based on reliable research evidence. consequently, there is a need to strengthen institutions and mechanisms that can promote interactions among researchers, policy-makers and other stakeholders who can influence the uptake of research findings. the health policy advisory committee (hpac) is on...

The goal of this paper is to investigate the effect of channel side information on increasing the achievable rates of continuous power-limited non-Gaussian channels. We focus on the case where (1) there is imperfect channel quality information available to the transmitter and the receiver and (2) while the channel gain is continuously varying, there are few cross-region changes, and the noise c...

Cooperative transmission is an emerging wireless communication technique that improves wireless channel capacity through multiuser cooperation in the physical layer. It is expected to have a profound impact on network performance and design. However, cooperative transmission can be vulnerable to selfish behaviors and malicious attacks, especially in its current design. In this paper, we investi...

In this work, we study the viability and potential gains of using a cooperative scheme in WiMAX networks. In particular, an opportunistic relay selection strategy is analyzed in a realistic scenario where the available channel state information is in general outdated. The analysis is performed in terms of outage probability, defined as the probability that instantaneous capacity is lower than a...

Cognitive radio (CR) systems allow unlicensed secondary users to transmit on the licensed frequency bands without degrading the transmissions of licensed primary users. Combining CR with other emerging techniques such as multi-antenna relaying may bring many benefits for the secondary transmissions. In this study, the authors propose and investigate a new relay-based cooperation scheme for a CR...

In this paper, the problem of secret key agreement in state-dependent multiple access channels with an eavesdropper is studied. For this model, the channel state information is noncausally available at the transmitters; furthermore, a legitimate receiver observes a degraded version of the channel state information. The transmitters can partially cooperate with each other using a conferencing li...