Leandro de Haro-Ariet

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.

New test-bed for evaluation of antenna and system performance for MIMO systems

A new testbed specifically designed for evaluation and measurement of MIMO systems is presented. A flexible and reconfigurable system was implemented, where some system parameters such as sampling frequency and power gain are selectable via software. Also multiple antenna configurations are considered. A user interface was developed in order to simplify testing of algorithm. Thus, the user does not need to design the MIMO scheme or algorithm considering real-time constrains or requirements of the specific platform. On the other hand, real implementation effects and realistic scenarios are included in the system, which allows a more complete study of algorithms. An example with a conventional MIMO algorithm was performed in order to validate the implemented testbed.

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.

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.

WCDMA Uplink Capacity and Interference Statistics of Highways Shaped Microcells with Imperfect Power Control and Finite Transmitted Power

The capacity and the interference statistics (mean and variance) of the sectors of a Cigar-, Tee-, and Cross-shaped WCDMA microcells are studied. Models of 5, 7, and 9 microcells are used to analyze the uplink capacity of the cigar-, Tee-, and cross-shaped W-CDMA microcell, respectively. The capacity and the interference statistics of the microcell are studied for different sector range and antenna side lobe levels. It is shown that the highest sector capacity is obtained when the microcell is cigar-shaped. For a cross-shaped microcell, the sector capacity is the lowest. Also it is shown that the uplink sector capacity will be very high if synchronous WCDMA is used in the uplink. To get the quasi maximum capacity, the sector range should be (0.6 – 1) km and the side lobe level of the directive antenna used in each sector should be – 15xa0dBc or lower.

On the Impact of Ultra Wide Band (UWB) on Macrocell Downlink of CDMA-PCS System

In this paper, we present an analytical model to quantify the effect of the Ultra-Wide Band (UWB) transmitters on the CDMA-PCS downlink range and normalized capacity. The effect is given for different configuration and environments. Our analysis shows that, for a single UWB transmitter, an UWB power density of −78dBm/MHz is the maximum permitted power density to have only PCS macrocell capacity reduction of 1% when the distance between the PCS mobile and the UWB transmitter is 1xa0m. For the multiple UWB transmitters case, a power density of −80dBm/MHz, is the maximum permitted power density to have only PCS macrocell capacity reduction of 1% when the distance between the PCS mobile and the UWB transmitter is 1xa0m.

Source Location via Subspace Based Methods through WLAN Frequency Measurements

Subspace based methods for direction-of-arrival (DoA) estimation, generally works on the assumption that the source is located at the far-field region, so signal wave front impinging on an array is plane. When this condition is broken, performance of these algorithms becomes degraded and the algorithms are unable to focus the source located at the near-field. Measuring the path traveled by the signal from the source to each array element, the signal phase at each array element can be correctly computed so we can construct the true steering vector associated to the signal emitted from a near-field source having assumed the distortion of the spherical wave front. We conducted some simulations and measurements to analyse this approach.

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.

On the capacity optimization in multicarrier channel operation

The transmission plan for a communications channel exploited in multicarrier mode involves the operational parameters and the prediction of the channel impairments with special consideration for the intermodulation noise generated by beating among carriers. The intermodulation noise is a driving factor in the design phase of a transmission plan as it seriously affects the C/N + 1 ratio of the carriers in the channel, being often the dominant factor. n n n nThe transmission plan of a channel operated in multicarrier mode can be represented as an injective application between two sets: the carriers and the frequency slots of the channel. Classical combinatory laws allow for the prediction of the number of configurations that can be established with sets of unidimensional elements. However, if one of the sets has elements with non-unidimensional attributes, the classical combinatory laws fail to predict the number of possible configurations. This is the case in multicarrier transmission plans, where the carriers have an associated bandwidth (attribute of the carrier) that typically occupy several frequency slots. In this paper, an expression for the prediction of the number of possible configurations in a transmission plan is derived. This expression permits to select the most appropriate method to achieve transmission plan optimization, as a function of the associated computational resources. n n n nThe higher the number of configurations, the higher the options for the optimization of the transmission plan. Subsequently, the C/N + I ratio of the carriers can be increased and therefore the quality of the service and the use of the channels resources are improved. Investigation of the space of configurations show that the maximum number of possible configurations is achieved in the range of 70–90% of channel occupation, which converges with the typical operational use of satellite transponders in multicarrier operation. n n n nThis discussion is applicable not only to the frequency domain but also to any other system where sets of elements with non-unidimensional attributes have to be considered (time domain, space domain, etc.). Copyright