IST-2000-30148 I-METRA: D3.1 Design, analysis and selection of suitable algorithms

This deliverable contains a description of the space-time coding algorithms to be simulated within the I-METRA project. Different families of algorithms have been selected and described in this document with the objective of evaluating their performance. One of the main objectives of the I-METRA project is to impact into the current standardisation efforts related to the introduction of Multiple Input Multiple Output (MIMO) configurations into the High Speed Downlink and Uplink Packet Access concepts of UMTS (HSDPA and HSUPA). This required a review of the current specifications for these systems and the analysis of the impact of the potential incorporation of the selected MIMO schemes.Preprin

Measurement techniques enhancements for MIMO 4G mobile communication systems. extension of mode stirred reverberation chambers (MSRCs) emulation capabilities

[ENG] Mobile communications have experienced a brutal raise over the past 15 years. What started as a voice communication system (GSM or 2G) has finished yet as a data communication system of any kind, which in some cases has come to replace the conventional cabled data access infrastructure. This change in the use given to mobile devices necessarily entails a change in the underlying technology, which should be capable to provide the transmission speeds that these new applications require. This has emerged in recent years an increasing interest in multiple antenna techniques, usually referred as multiple-input multiple-output (MIMO) techniques, as they increase the spectral efficiency (and thus the transmission rate for a given bandwidth) of wireless systems. In this thesis, some of the factors limiting the ideal advantages of these multiantenna techniques are studied, in order to quantify the differences between the ideal behavior of 4G devices and behavior that users will experience in actual use conditions. The effect that the user has on the final performance of the devices is one of the main limitations that these devices are in daily use. Mobile phones are used almost all the time in the vicinity of the user, causing a decrease in the richness of the multipath electromagnetic environment (and thus a reduction of the MIMO benefits). As a result of this reduction, the number of signal paths that reach the user is also reduced. In this thesis both factors (user influence and influence of the number of signal paths) will be studied both for passive devices (antenna prototypes) and active devices (commercial phones). The second part of this thesis consist on the study of how to transfer some of these factors reducing the isotropicity of the environment, to one of the most promising measurement techniques, as it is the mode-stirred reverberation chamber (MSRC). This technique emulates naturally an isotropic rich multipath environment with the signal strength following a Rayleigh distribution. However, in this thesis two new techniques are proposed that allow the emulation of less isotropic environments without altering the basic operating principle of the MSRC. [SPA] Las comunicaciones móviles han experimentado un aumento brutal en los últimos 15 años. Lo que comenzó como un sistema de comunicación de voz (GSM o 2G) ha terminado todavía como un sistema de comunicación de datos de cualquier tipo, que en algunos casos ha llegado a sustituir la infraestructura de cableado convencional de acceso a datos. Este cambio en el uso que se da a los dispositivos móviles implica necesariamente un cambio en la tecnología subyacente, que debe ser capaz de proporcionar las velocidades de transmisión que estas nuevas aplicaciones requieren. Esto se ha convertido en los últimos años un creciente interés en las técnicas de múltiples antenas, normalmente se conoce como técnicas de múltiple entrada y múltiple salida (MIMO), ya que aumentan la eficiencia espectral (y por lo tanto la velocidad de transmisión para un ancho de banda dado) de los sistemas inalámbricos. En esta tesis, algunos de los factores que limitan las ventajas ideales de estas técnicas de múltiples antenas son estudiados, con el fin de cuantificar las diferencias entre el comportamiento ideal de dispositivos 4G y comportamiento que los usuarios experimentarán en condiciones reales de uso. El efecto que el usuario tiene sobre el rendimiento final de los dispositivos es una de las principales limitaciones que estos dispositivos son de uso diario. Los teléfonos móviles se utilizan en casi todo el tiempo en la proximidad del usuario, causando una disminución en la riqueza del entorno electromagnético trayectos múltiples (y por tanto una reducción de los beneficios MIMO). Como resultado de esta reducción, el número de trayectorias de señal que llegan al usuario también se reduce. En esta tesis ambos factores (la influencia del usuario y la influencia del número de caminos de señal) se estudió tanto para dispositivos pasivos (prototipos de antenas) y los dispositivos activos (los teléfonos comerciales). La segunda parte de esta tesis consisten en el estudio de cómo transferir algunos de estos factores que reducen la isotropicity del medio ambiente, a una de las técnicas de medición más prometedores, como es la cámara de agitación de modos (MSRC). Esta técnica emula naturalmente un entorno isotrópico multipath rico con la intensidad de la señal después de una distribución de Rayleigh. Sin embargo, en esta tesis, dos nuevas técnicas que se proponen permitir la emulación de entornos isotrópicos menos sin alterar el principio de funcionamiento básico del MSRC.Universidad Politécnica de Cartagen

Comparison of Picocell and DAS Configuration with HSPA Evolution

As demand of mobile data services has grown exponentially, it has increased pressure on mobile operators to enhance capacity in dense urban areas. Usage of internet and services related to mobile network has grown up. UMTS specification has been updated in order to cope with an increased amount of mobile data traffic. These upgrades and releases are based on international standards. HSDPA and HSUPA technologies are previous upgrades of UMTS network but now HSPA Evolution (HSPA+) is the upgraded version for UMTS. HSPA+ improves performance of mobile data transmission in downlink direction. Previously UMTS enabled user data of 384 kbps that was upgraded to 14.4 Mbps in downlink and 5.76 Mbps in uplink data rate by HSPA. But still the demand of data rate is increasing so HSPA+ upgraded UMTS to 21.1 Mbps in downlink and 5.76 Mbps in uplink. Due to these improvements in data rates, HSPA+ has become one of the striking choices for mobile operators. It has been forecasted that amount of data users will increase in future and this will set new challenges for mobile operators. The network is planned in such a way that more capacity is provided to places where more users are present. Most of the network traffic in dense urban area is generated by indoor users. Indoor planning is mostly done with multiple picocells or DAS configuration. The main differences between these two configurations are interference, total capacity, cost of the equipment and implementation. In this Master’s thesis, the main focus is to compare picocells and DAS configuration for HSPA+ by simulations and measurements. Several mobile terminals were used to generate low and high loads for HSPA+ network. These comparisons were made by analyzing the results for signal to interference ratio, total network throughput and several other indicators. The results showed that DAS outperforms picocells in low/high load conditions in terms of SIR, cell throughput and modulation technique. DAS is good choice for medium sized building due to handover free regions and smooth coverage. /Kir1

LTE performance study

Long Term Evolution (LTE) has been designed with new architecture and features to meet user’s high data rates demand for a longer term in the future. 3rd Generation Part-nership Project (3GPP) has set the goals and targets for LTE with better performance and data rates close to fixed networks. In this thesis outdoor measurements have been conducted in three different environ-ments macro/rural, urban and suburban. This thesis study has been done with single user measurements and performance analysis scenario. The idea of measurements was to analyze LTE performance in three different types of environments. Performance analysis has been done using few key performance indicators and parameters including RSRP, RS SNR, MAC downlink throughput, timing advance and CQI. Vendor/operator specific key performance indicators and parameters were unknown. The results and analysis of this thesis give an idea about LTE performance in three dif-ferent outdoor environments. The output of this thesis study can be beneficial in under-standing LTE behavior and performance in different environments, which can be further useful in planning and deployment phases for LTE

WCDMA multiclass downlink capacity and interference statistics of cigar-shaped microcells in highways

The final publication is available at Springer via http://dx.doi.org/10.1007/s11277-013-1048-5In this paper, the multiclass downlink capacity and the interference statistics of the sectors of a cigar-shaped microcells using wideband code-division multiple-access with soft handover mode are analyzed. The two-slope propagation model with log-normal shadowing is used in the analysis where a model of 8 cigar-shaped microcells is utilized. The performance of the downlink is studied for different [sector range R, standard deviation of the shadowing (σ1 and σ2) and propagation exponents (s1 and s2)]. It is found that increasing the sector range from 500 to 1,000 m will increase the sector downlink capacity. Also, it is found that increasing the value of the propagation parameters (σ1 and σ2) will reduce the downlink sector capacity. It is noticed that, the effect of changing the propagation exponent s1 is null while increasing the propagation exponent s2 will increase the downlink capacit

Application of SDMA with scheduling for MIMO MC-CDMA

Incoming Beyond 3G systems provides high data rates by using several techniques including Beamforming. Convenient DRA design is required to optimize the capabilities offered by smart antennas. This paper is to presents a DRA algorithm based on the HSDPA of UMTS, including scheduling that exploit SDMA technique that was implemented in the ambit of the IST 4MORE project. Results shown cell throughput gain of SDMA compared to sectorized cells about 76%, and that SDMA gain will increase with user diversity within the cell