Tracy Fulghum

Learn More
In this paper we present the main concepts of high speed packet access evolution currently being standardized in 3GPP. In general HSPA evolution consists of introduction of MIMO, higher order modulation, and protocol optimizations and optimizations for voice over IP. We describe these improvements in detail and show that HSPA Evolution can reach performance(More)
Direct-sequence code-division multiple-access (DSCDMA) cellular systems, such as wideband CDMA (WCDMA), are limited in performance by interference. Linear equalization, such as generalized Rake (G-Rake) receivers and transversal chip equalizers, can theoretically provide significant gains in performance by suppressing interference. In this paper, an(More)
radio channel. In the future, however, besides collecting signal energy, advanced receivers will be used to suppress interference. In this regard, G-Rake receivers show great promise. 3 To understand the G-Rake receiver, let us briefly review WCDMA transmission. Figure 1 shows the transmission and reception of a single stream of information. Information(More)
Recently a MIMO-HSPA testbed based on the commercial release '99 products has been within Ericsson in order to demonstrate and evaluate enhanced data rates in the downlink for the evolution of HSPA. The testbed employs two antennas at both the base and mobile stations (2 times 2 MIMO) and is able to adapt between single- and dual-stream data transmission.(More)
We develop a parametric receiver for packet data systems based on the generalized Rake (G-Rake) formulation. The focus here is on multi-antenna receivers to exploit both the spatial and temporal dimensions in suppressing interference. We extend previous G-Rake formulations to multi-antenna reception and propose an adaptive, parametric form to handle the(More)
As 3G DS-CDMA cellular systems evolve to higher data rates, linear equalization is being used to address intersymbol interference introduced by dispersive channels. When parametric designs are employed, elements of an impairment or data covariance matrix must be computed as part of equalizer weight calculation. The conventional approach is to express these(More)
  • 1