It is well-known that, in DS-CDMA downlink signal transmission, frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can replace rake combining to achieve much improved bit error rate (BER) performance in severe frequencyselective fading channel. However, in uplink signal transmission, as each user’s signal goes through a different channel, a severe multi-user...

In this monograph, the impact of cooperation on the performance of wireless cellular systems is studied from an information-theoretic standpoint, focusing on simple formulations typically referred to as Wynertype models. Following ongoing research and standardization efforts, the text covers two main classes of cooperation strategies. The first class is cooperation at the base station (BS) leve...

The paper carries out performance analysis of a multiuser full-duplex (FD) communication system. Multiple FD UEs share the same spectrum resources, simultaneously, at both the uplink and downlink. This results in co-channel interference (CCI) at the downlink of a UE from uplink signals of other UEs. This work proposes the use of diversity gain at the receiver to mitigate the effects of the CCI....

In this paper, different beamforming techniques are employed in the wide-band code-division multiple-access base station, and their uplink and downlink signal-to-(interference plus noise) ratio (SINR) performances are compared. It is found that the direction of arrival (DOA) method and the complex conjugate method almost have the same uplink SINR performance, but the complex conjugate method wi...

In this paper, we propose a distributed channel allocation scheme for the uplink data traffic and implement a priority oriented scheduling for the downlink data traffic for a powerline access type network. We study the performance of the uplink and downlink protocols in terms of the buffering probability, mean delay, statistical dropping probability and the number of subscriber stations support...

Dynamic time-division duplexing (TDD) enables independent uplink/downlink mode scheduling at each cell, based on the local traffic. However, this creates cross-interference among cells. Thus, joint power allocation and problem becomes mixed-integer non-convex turns out to be NP-hard. We propose a low-complexity decentralized solution, where are decoupled. First, is allocated in fashion, then mo...

Network-wide broadcasting is a fundamental operation for mobile ad hoc networks. In broadcasting, a source node sends a message to all other nodes in the network. Under ordinary flooding procedure, each node transmits the broadcast message to all of its 1-hop downlink neighbours, i.e. all nodes residing within its radio-range. Receiving the broadcast message all those downlink neighbours reply ...

This paper presents a new development of mobile communication for application to remote data transmission and control. The concept of G, including global positioning system, global system for mobile (GSM), and geographic information system, is proposed. In this paper, a GSM real-time control system for data uplink and downlink remote terminals is considered. The proposed system can be implement...

The uplink-downlink duality is reviewed with regard to constraints imposed on the transmission schemes in practice. In particular, the effects of non-Gaussian signaling, the use of implementable precoding schemes, and the availability of only imperfect channel state information at the central base-station are analyzed and discussed. The sources for violating the uplink-downlink duality in pract...