multiple access cdma
Linear Quadratic Power Control of CDMA Cellular Systems
White Paper In direct sequence CDMA systems, multiple users share the same bandwidth and are separated by pseudorandom codes; consequently, each user contributes as interference to the others. In any multiple access system, the need for power control is... [03 Jul 2008]
A New CDMA/SDMA Structure With Transmit Diversity
White Paper Here these two techniques are combined to produce a new cooperative diversity architecture for CDMA/SDMA cellular systems using a space time block code. Space division multiple access (SDMA) is a technique, which can be used to increase the... [03 Jul 2008]
CDMA Waveform Generation for Digital Radios
White Paper Graphs demonstrate the effect of pulse shaping and CDMA user loading on the transmitted waveform's peak-to-average power ratio (PAPR). A design for the generation of wideband code division multiple access (WCDMA) waveforms in digital radios is... [03 Jul 2008]
Iterative Transmitter and Receiver Optimization for CDMA Networks
White Paper Optimization of the capacity of a single-cell Code Division Multiple Access (CDMA) system, both from the perspective of the maximum number of users that can be served at a required quality of service level and from the information theoretic... [03 Jul 2008]
The cdma2000 High Rate Packet Data System
White Paper Code division multiple access (CDMA) technology was introduced in cellular systems in the early 1990s with the development of the IS-95 standard. Since then, the technology has been widely deployed throughout the world reaching the 90-million... [03 Jul 2008]
Blind Channel Estimation for Downlink CDMA Systems
White Paper The problem of channel estimation in code-division multiple-access (CDMA) systems is considered. Using only the spreading code of the user of interest, a technique is proposed to identify the impulse response of the multipath channel from the... [03 Jul 2008]
Blind Channel Estimation for DS-CDMA
White Paper The problem of channel estimation in code-division multiple-access systems is considered. Using only the spreading code of the user of interest, a technique is proposed to identify the impulse response of the multipath channel from the received... [03 Jul 2008]
Comparison of Multi-Cell Multi-Antenna CDMA and TDMA Systems
White Paper When comparing TDMA and CDMA in the uplink, there is a crossover in capacity. At low SNR CDMA is preferable, at high SNR TDMA performs better. This paper evaluates system capacities for multicellular systems with different multiple access strategies. [03 Jul 2008]
Forward-Link Capacity of a DS/CDMA System With Mixed Multirate Sources
White Paper Some studies have been done on capacity of a code division multiple access (CDMA) system with mixed multirate sources. This trend comes from the fact that the capacity of a CDMA system is reverse-link limited. [03 Jul 2008]
Per Connection Delay Analysis of a Frame-Based TDMA/CDMA MAC Protocol
White Paper A hybrid of TDMA and CDMA or the so-called time slotted CDMA is a popular mainstream multiple-access technique in coordinating resource to accommodate a number of traffic connections/sources. The purpose of this paper is to conduct thorough delay... [03 Jul 2008]
A TDMA-Based Bandwidth Reservation Protocol for QoS Routing in a Wireless Mobile Ad Hoc Network
White Paper Existing solutions have addressed this problem by assuming a stronger multi-antenna model, where the bandwidth of a link is independent of the transmitting/receiving activities of its neighboring links, or a less stronger CDMA-over TDMA channel... [03 Jul 2008]
Synchronization of Optical Orthogonal Codes in Optical CDMA Systems Via Simple Serial-Search Method
White Paper This paper analyzes the performance of a simple serial-search algorithm for optical code division multiple access (CDMA) systems using Optical Orthogonal Codes (OOC). For our analysis we use advance photon-counting methods and we consider the... [03 Jul 2008]
Variable Bit Allocation for FH-CDMA Wireless Communication Systems
White Paper A frequency-hopped code-division multiple-access system can adapt to the different interference levels in hopping patterns and assign the slots different bit rates to increase the system capacity. In the wireless indoor environment, the channel may... [03 Jul 2008]
Pegaso Emerges As Cellular Contender with IBM Solution
White Paper To increase its market share, Pegaso depends on innovative technology, including its fully digital CDMA (code division multiple access) network, which offers better quality sound and more privacy than competing network technologies. [03 Jul 2008]
ATM: The Technology of Choice for Third Generation Wireless Networks
White Paper It provides a chronological perspective of how we got from Second Generation (2G) wireless systems to the 3G standard known as Universal Mobile Telecommunications System / Wideband - Code Division Multiple Access (UMTS / W-CDMA) technology and why... [03 Jul 2008]
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