This paper deals with the problem of admission control in the downlink of UTRA-FDD. Significant differences with respect to the uplink admission control arise. While in the uplink admission control strategies based on the load factor are suitable, in the downlink an admission strategy based on measured power levels appears more suitable. This paper proposes and analyses an algorithm that is bas...

A clustered multihop cellular network (CMCN) with virtual cells has been proposed to achieve the characteristics of macrocell/microcell hierarchically overlaid architecture by applying clustering techniques. As a complement to the traditional cellular networks, CMCN is able to incorporate the flexibility of ad hoc networks by allowing multihop transmission. In this paper, we first propose to us...

1. Introduction Adaptive antennas at the base station are one of the key-technologies to satisfy the increasing capacity demand of already existing and future cellular mobile communication networks. Several sophisticated uplink algorithms have been proposed for signal separation and detection. But downlink beamforming seems to be the pivotal point for the applicability of adaptive antennas in c...

In this paper, linear beamforming design for amplify-and-forward relaying cellular networks is considered, in which base station, relay station and mobile terminals are all equipped with multiple antennas. The design is based on minimum mean-square-error criterion, and both uplink and downlink scenarios are considered. It is found that the downlink and uplink beamforming design problems are in ...

This paper introduces an analytical approach which is provided to calculate the downlink and uplink capacities of the time division duplex (TDD) system utilizing the underused frequency division duplex (FDD) uplink which shares the same frequency band. Then the ratio of downlink and uplink slots in one frame is adjusted, so as to prevent the radio resource waste due to asymmetric traffic charac...

This paper considers a single-cell massive multipleinput multiple-output (MIMO) system equipped with a base station (BS) that uses one-bit quantization and investigates the energy efficiency (EE) and spectral efficiency (SE) trade-off. We first propose a new precoding scheme and downlink power allocation strategy that results in uplink-downlink SINR duality for one-bit MIMO systems. Taking into...

The overlay of an intelligent Frequency Diversity Spread Spectrum System (FDSS) on the Advanced Mobile Phone Service system (AMPS) is studied. The worst-case condition is considered for the downlink analysis. Moreover, the effect of sidelobes outside the FDSS principal spectrum is considered. The downlink and uplink capacity of both systems are given using a model of 25 cells. Results show that...

In this paper, the space time transmit diversity (STTD) decoding combined with minimum mean square error (MMSE) equalization and antenna diversity reception is presented for MC-CDMA downlink and uplink in the presence of multiple users. The equalization weights that minimize the mean square error (MSE) for each subcarrier are used. From computer simulation, it was found that the downlink BER pe...

This paper evaluates the performance of QoS-aware Mobile IP Fast Authentication Protocol (QoMIFA) compared to the well-known Simple QoS signaling protocol (Simple QoS) via simulation studies modeled in the ns2. The evaluation comprises the investigation of network load impact on both protocols with respect to the time required to reserve resources, number of dropped packets per handoff and numb...

This paper models and analyzes downlink and uplink power assignment in Code Division Multiple Access (CDMA) mobile networks. By discretizing the area into small segments, the power requirements are characterized via a matrix representation that separates user and system characteristics. We obtain a closed-form analytical expression of the so-called Perron-Frobenius eigenvalue of that matrix, wh...