Miguel Calvo-Ramón

W-CDMA Uplink Practical Capacity and Interference Statistics of Rural Highways Cigar-Shaped Microcells with Imperfect Power Control and Finite Transmitted Power

The capacity and the interference statistics of the sectors of the cigar-shaped W-CDMA microcell are studied. A model of 5 microcells is used to analyze the uplink. The microcells are assumed to exist in rural zones. The capacity and the interference statistics of the microcell are studied for different sector range, different antenna side lobe levels, different values of the break point distance, different values of the propagation parameter s2 and different standard deviation of the power control error.

High altitude platforms (HAPs) W-CDMA system over cities

The performance of downlink power control model, based on a n-th power distance law, is evaluated for high altitude platform station (HAPS) W-CDMA systems. The downlink capacity using this model is compared with the uplink capacity. It is shown that the uplink capacity is higher than the downlink capacity. As a case study it is shown that Madrid (the capital) can be covered by a platform with 169 beam. For a HAPS platform with 169 cells (beams) the total practical capacity of the system could be in the order of 10000 voice users or 1250 data users.

W-CDMA uplink capacity and interference statistics of a long tunnel cigar-shaped microcells

The capacity and the interference statistics of the sectors of the cigar-shaped W-CDMA microcell are studied. A model of multimicrocells is used to analyze the uplink when the users are within an under-ground train. The microcells are assumed to exist in a long under-ground tunnel. The capacity and the interference statistics of the microcells are studied for different propagation exponent, different antenna side lobe levels and different bends loss. The capacity for the best case and worst case are given.

UMTS-HSDPA in High Altitude Platforms (HAPs) communications with finite transmitted power and unequal cell's load

In this paper, the performance of HAPs (High Altitude Platforms) UMTS HSDPA (High Speed Downlink Packet Access) is studied for different scenarios and two directions (0^o and 30^o) within the cell where the network under study is assumed to have 61 cells. It is concluded that, for urban zone users, the effective range is lower than the effective range for users in rural zones. It is shown that in rural zones, the HSDPA mode can support the modulation 16QAM with 7/8 code rate when cells are not fully loaded. For fully loaded rural cells, the 16QAM modulation scheme with code rate of 7/8 cannot be supported. Also, it is noticed that, in urban zones, HSDPA mode can support 16QAM with code rate of 1/2 and QPSK modulation schemes when cells are not fully loaded. For fully loaded urban cells, only QPSK with code rate of 1/2 can be supported.

WCDMA Uplink Capacity of a Long Tunnel Cigar-shaped Microcells for Underground Train Service

In this paper, the capacity and the interference statistics of the sectors of the cigar-shaped WCDMA microcells are studied using the hybrid model of propagation. A model of nine microcells in a metro tunnel is used to analyze the uplink capacity and the interference statistics. The capacity and the interference statistics of the microcells in metro tunnels are studied in this work for different propagation parameters, antenna side lobe levels, sector ranges and bends losses.

Down-link analysis of a FDSS-GSM overlay system

The overlay of a frequency diversity spread spectrum system (FDSS) on the GSM system is studied. The worst-case condition is considered for the downlink. The downlink capacity of both systems is studied using a model of 36 cells. The performance of the GSM and FDSS users is investigated. An original GSM system with 48 channel/cell can be substituted by a mixed system, which has a GSM system capacity of 48 users/cell and an FDSS system capacity of 116 users/cell when each cell has 6 sectors.

On the UMTS macrocells downlink capacity in open rural zone near shaded Deep Space Network (DSN) installations

The UMTS macrocell downlink capacity is evaluated for macrocells that operate at the same frequency of the Deep Space Network (DSN) and that are near shaded DSN installations. It has been found that the downlink capacity is not affected when the distance between the DSN installations and the macro-cell is more than 35 km. For a distance greater than the obstacle distance, the effect of the DSN is less compared with the un-shaded case.