Eduardo A. S. Esteves

On the reverse link capacity of cdma2000 high rate packet data systems

The cdma2000 high rate packet data standard, also known as IS-856, is a next generation solution to high-speed wireless Internet access. In this paper, we present an overview of the reverse link characteristics and its performance. In particular, we evaluate the capacity of the reverse link in both single cell and multi-cell, 3-sectored networks. Analytical expressions are derived to include the effect of practical antenna patterns on the reuse factor, f. Also, a novel approach to model sector load is considered in order to account for the effects of high data rate transmissions.

The high data rate evolution of the cdma2000 cellular rate

An overview of the high data rate (HDR) CDMA system currently being standardized by the 3GPP2 organization is presented. The HDR system, also known as 1xEV Phase I, is an evolution of the cdma2000 family of standards and is designed to provide a highly efficient air interface for packet data applications such as wireless internet. In this paper, the basic physical and MAC layer concepts of the new standard are discussed. In addition, results are presented demonstrating the effectiveness of these concepts.

A reverse link outer-loop power control algorithm for cdma2000 1xEV systems

Reverse link outer-loop power control (ROLPC) algorithms developed for voice systems operate based on a continuous stream of packets (CRC events) to adjust the power control setpoint. Due to burstiness of data traffic a mechanism to distinguish between idle periods and data transmissions is necessary in systems optimized for data communications. In addition, such algorithms are unable to track changes in channel conditions during long idle periods. The proposed algorithm is designed to conservatively adapt to the channel in the absence of packets, with fast convergence at the start of a transmission. A parameterized algorithm is described with analysis and simulation results to justify baseline parameters. The performance of the algorithm for continuous and bursty TCP/IP traffic is presented.

Reverse link capacity and coverage improvement for CDMA cellular systems using polarization and spatial diversity

This paper explores the benefits of increased diversity order using spatially separated, polarized antennas at the base station receiver of a CDMA cellular system. Field tests are conducted in real mobile wireless environments. A conventional dual diversity receiver is compared with one that implements four-way diversity combining using spatially separated cross-polarized antennas. Several measured quantities are logged at the base station receiver and the mobile transmitter during a packet data connection at fixed data rate. Existing published results that explore polarization diversity focus on correlation measurements between received signal polarization components. The emphasis of the present study is to quantify reverse link capacity and coverage improvements for a CDMA cellular network as a result of exploiting polarization as an additional source of diversity at the base station receiver.

Performance of fixed wireless access with cdma2000 1xEV-DO

Fixed and portable wireless Internet access is becoming an important segment for the wireless industry. 1xEV-DO, also known as IS-856, has been designed to offer increased user experience and high capacity packet data services on cdma2000 networks. The initial set of 1xEV-DO performance results in the literature has focused on mobile environments. In this paper, we address some of the fixed wireless aspects and the corresponding impacts on system performance. A network level simulation of both forward and reverse links including physical and MAC layer details of 1xEV-DO is used to quantify performance. In addition to average throughput per sector, we quantify the user performance on both links as a function of total attenuation. This provides insight on how performance varies within the coverage area - a very important aspect for fixed access. Moreover, we also show how different forward link data schedulers can be used to tradeoff system capacity for a more uniform performance regardless of the terminal distance to the serving base station.

The impact of antenna-array receivers on the reverse link performance of CDMA 2000 1xEV high rate packet data systems

CDMA2000 1xEV standard, also known as IS-856, is a next generation solution to high-speed wireless Internet access, In this paper, we explore the possibility of improving the reverse link performance (in terms of coverage and data throughput) of IS-856 using adaptive antenna array receivers. Specifically, we consider the effect of array size, configuration and discuss how we can tradeoff the antenna gains via adjustment in MAC layer protocols. We look at spatially, separated antenna arrays as well as pairs of cross-polarized (X-pol) antennas. The key difference between our study and many existing smart-antenna results is that we consider the dynamics associated with power-control and upper-layer algorithms in addition to the physical-layer interactions. Our results are based on a comprehensive simulation environment that incorporates realistic channel models and IS-856 physical and MAC layer processing.