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Constrained Maximum-Likelihood Detection in CDMA

whitepaper The detection strategy usually denoted optimal multiuser detection is equivalent to the solution of a (0, 1)-constrained maximum-likelihood (ML) problem, a problem which is known to be NP-hard. In contrast, the unconstrained ML problem can be...

Tags: tdma - cdma, constrained, detector, considers

[10 Apr 2008]

Variable Bit Allocation for FH-CDMA Wireless Communication Systems

whitepaper In the wireless indoor environment, the channel may vary slowly as users and the interferers may move at slow speeds. A frequency-hopped code-division multiple-access system can adapt to the different interference levels in hopping patterns and...

Tags: mobile - wireless communications, capacity, interference, system capacity

[10 Apr 2008]

Europe Telecom Services - WiMAX & Family: Threats and Opportunities

whitepaper After a number of false dawns of alternative wireless broad band technologies outside the main stream focus of UMTS / W-CDMA / 3G, there has been growing debate in the telecom industry of whether a new generation of wireless technologies like...

Tags: wi-fi (802.11), generation, range, telecom

[10 Apr 2008]

QUALCOMM Builds Eudora Pro With Rogue Wave Objective Toolkit From Stingray

whitepaper QUALCOMM Incorporated is recognized as the pioneer of CDMA digital wireless communications, products and technologies. QUALCOMM wanted a toolkit to use with a future version of Eudora Pro Email 4.0. As Eudora Pro software is based on Microsoft...

Tags: gui, toolkit, mfc, recognized

[10 Apr 2008]

The Road to 3G

whitepaper Technologies including PDC, cdmaOne (IS-95), TDMA (IS-54, IS-136), GSM, GPRS, EDGE, cdma2000 (IS-2000), cdma2000 1xEV-DO (IS-856), and W-CDMA (UMTS FDD) are discussed. This paper provides a high level overview of 2G and 3G wireless cellular...

Tags: mobile - wireless communications, discussion, high level, path

[10 Apr 2008]

Qualcomm Case Study: City of Alliance Municipal Electric System

whitepaper With one BREW application and ALLTELL's 3G CDMA network, AMES has moved from a paper-based organization to a fully networked and wirelessly enabled organization. The City of Alliance Municipal Electric System (AMES) department distributes...

Tags: voip - ip telephony, field, networked, workforce

[10 Apr 2008]

Nato allies form cyber defence command

News The Cyber Defence Management Authority (CDMA) will co-ordinate cyber defence among Nato allies after its formation was backed by members at the Nato summit in Bucharest last week. The Brussels-based CDMA will strengthen nation states cyber defences...

Tags: cyber, defence, nato

[08 Apr 2008]

'Super-3Gs' get connected via the Gobi

News Greg Raleigh, vice president of product management for Qualcomm CDMA Technologies, said: "The Gobi solution enables enterprise users and consumers with the freedom of being untethered from wi-fi hotspots and connecting to the internet using...

Tags: hp, wireless, lenovo, dell

[07 Apr 2008]

Soft Handoff and Uplink Capacity in a Two-Tier CDMA System

whitepaper In systems using Code-Division Multiple Access (CDMA), user capacity is enhanced by using soft handoff. This paper examines the effect of soft handoff on the uplink user capacity of a CDMA system consisting of a single macrocell in which a single...

Tags: mobile - wireless communications, path, capacity, base

[24 Mar 2008]

Modeling TCP in a Multi-Rate Multi-User CDMA System

whitepaper Modern CDMA wireless channels support multiple transmission rates, which can be dynamically assigned to users based on traffic demand. However, in practice, assignment of high rate channels comes with the penalty of increased power as well as...

Tags: tcp - ip

[28 Feb 2008]

Distributed Uplink Scheduling in CDMA Networks

whitepaper As mobile devices grow more powerful and diverse in the applications they run, it becomes increasingly desirable to give them some independence in scheduling their transmissions. The latest release of the CDMA2000 1xEV-DO system incorporates a...

Tags: mobile - wireless communications

[28 Feb 2008]

The mobile industry in its own words

News For those of you who are old enough and who have followed our industry for long enough, you know the old debates around TDMA and CDMA and GSM - they were not particularly productive debates to have in the end.

Tags: nokia, mobile, vodafone, cisco

[22 Feb 2008]

Securing Wireless Technology

whitepaper Wireless technology is a broad reaching term that can signify Wireless Local Area, (WLAN or Wi-Fi); Wireless Wide Area (WWAN), such as CDMA or GRPS; Radio Frequency IDentification (RFID); or personal area networking technologies such as Bluetooth.

Tags: mobile - wireless communications, wi fi, identification, term

[11 Feb 2008]

GPS phones to triple by 2012

News Malm said handsets with the ability to draw location information from the US-controlled satellite system were currently most common in those areas where phones are based on CDMA technology, such as the US.

Tags: satellite, enabled, nokia, insight

[16 Jan 2008]

Impact of Soft Handoff on TCP Throughput Over CDMA Wireless Cellular Networks

whitepaper In CDMA cellular networks, the soft handoff technique allows a mobile host to communicate with multiple base stations simultaneously, improving the transmission quality of the wireless channel and avoiding disconnection upon to base station...

Tags: tcp - ip

[14 Jan 2008]

End-to-End Testing of a Packet Core CDMA RNC

whitepaper The company wanted to conduct end-to-end System testing of a Packet Core CDMA Radio Network Controller (RNC). The challenge was to conduct the complete Real network end-to-end testing, including the Regression and Backward Compatibility testing for...

Tags: high availability

[14 Jan 2008]

Authentication and Encryption in CDMA Systems

whitepaper This white paper attempts to address the concept of Authentication and Encryption in CDMA systems and the usage of this feature in today's mobile telephony environment. Mobile usage has virtually penetrated every aspect of our daily lives from the...

Tags: service providers, authentication, cdma, concept

[14 Jan 2008]

Reliable W-CDMA Network Design

whitepaper This paper investigates the W-CDMA network design problem with reliability considerations. A design model that maximizes revenue net the cost of building and maintaining the network infrastructure to provide reliable communication subject to...

Tags: network design

[11 Jan 2008]

Measured TCP Performance in CDMA 1x EV-DO Network

whitepaper This paper investigates the long-lived TCP bulk throughput over the CDMA 1x EV-DO service that provides high-speed \always on" Internet connectivity in a wide-area mobile environment. Although the peak rates of downlink/uplink are specified as 2.4...

Tags: tcp - ip

[08 Jan 2008]

On the Design of an FPGA-Based OFDM Modulator for IEEE 802.16-2004

whitepaper Some examples are 802.11, 802.16, MC-CDMA, Digital Video Broadcasting, Wireless USB and Wireless Firewire. Current and future communication schemes tend to use OFDM systems in order to provide high baud rates and less inter symbol interference.

Tags: wireless lan, software defined radio, paper presents, radio

[07 Jan 2008]

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