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To: engineer who wrote (15696)	9/29/1998 11:00:00 AM
From: bananawind	Read Replies (1) \| Respond to of 152472

All...CDMA Development Group Addresses Key United States Government Officials on 3G Harmonization; Opportunity for United States to Take Leadership Position Business Wire - September 29, 1998 09:18 COSTA MESA, Calif.--(BUSINESS WIRE)--Sept. 29, 1998--The CDMA Development Group (CDG) Tuesday announced that a letter was submitted last week to 21 key United States Government officials, stressing the importance of harmonization for third generation mobile technologies (3G). The letter details the benefits of harmonizing the two leading third generation proposals, Wideband CDMA (W-CDMA) and cdma2000, also known as Wideband cdmaOne, explaining that the global telecommunications industry is at a critical juncture, providing the United States with the ideal opportunity to assume a leadership position on the issue. The letter was signed by Members of the CDG Executive Board, including AirTouch Communications, ALLTEL Communications, Ameritech Cellular, BC TEL Mobility, Bell Atlantic Mobile, Bell Mobility, GTE Wireless, LG Telecom, and Sprint PCS. "The letter explains how the presence of multiple second generation technologies was a key driver of growth and competition in the U.S. wireless market, and the significant differences between CDMA, GSM and TDMA still provide an important basis for competitive differentiation. In contrast, W-CDMA and cdma2000 are nearly identical and will provide little or no basis for competitive differentiation," said Perry LaForge, executive director of the CDG. "The CDG has always advocated open markets and the use of multiple technologies where there is a benefit to this approach. Our position throughout the 3G debate remains that similar standards proposals should be harmonized when the differences between these proposals are so insignificant that the consumer cannot tell the difference and may actually be disadvantaged by higher costs and lack of interoperability. "Therefore, supporters of proposals that are clearly different from W-CDMA and cdma2000, such as those based on TDMA technology, should continue their standardization efforts and should not be expected to converge with CDMA-based proposals. This approach is the very essence of the International Telecommunications Union's (ITU) ITU 2000 effort, and also something that the global telecommunications industry is expecting." LaForge continued, "In addition, we are encouraged that the North American GSM Alliance and the Universal Wireless Communications Consortium (UWCC) recently indicated their support for the principle of convergence. Historically, the two groups have been opposed to convergence, and we only hope this shift is not too little, too late. We assume that their decision to work together on 3G matters also indicates their support for the ITU's Family of Systems concept which incorporates both ANSI-41 and GSM MAP in 3G solutions. The GSM Alliance has opposed this concept in the past. We look forward to the UWCC and GSM Alliance actively contributing to the definition of an open interface between ANSI-41 and GSM MAP to enable global roaming to the IMT-2000 subscriber." The CDMA Development Group (CDG) is a nonprofit trade association formed to foster the worldwide development, implementation and use of cdmaOne. The 100 member companies of the CDG include many of the world's largest wireless operators and equipment manufacturers. The primary activities of the CDG include development of cdmaOne features and services, public relations, education and seminars, regulatory affairs and international support. Currently there are more than 500 individuals working within various CDG subcommittees on cdmaOne-related matters. For more information about the CDG, contact Christine Bock of the CDG News Bureau at 714/540-1030, Ext. 11, email chrisbock@bockpr.com, or visit the CDG Web site at cdg.org.

To: engineer who wrote (15696)	9/29/1998 11:18:00 AM
From: Valueman	Read Replies (1) \| Respond to of 152472

Ok all you engineering wizards, I need some off topic assistance! Can you tell me the significance of this technology?--Thanks! TITLE: New Multipath & Co-Channel Interference Suppression Techniques for Digital Data ABSTRACT/BENEFITS: Co-channel interference (CCI, i.e. interference from like-modulated signals), is rapidly emerging as one of the greatest impacts to new digital data communications systems, both military and commercial. Multiple users in the same frequency band and overlapping geographic locations often impact performance of communications equipment more than noise or more conventional interference. Multipath and dispersive channels firther exacerbate this impact. A new approach to mitigating Co-channel interference in a dispersive environment, applying Per Survivor Processing (PSP), offers the opportunity to achieve large performance improvements (e.g. improved acquisition, &/or interference rejection) over conventional design techniques when a large number of users, difficult dynamics and/or large channel uncertainties are present. Further, PSP excels when the channel characteristics, the number of interferers or reflections, & other key signal parameters are unknown. ViaSat proposes to develop CCI suppression concepts for multipath environments based on PSP techniques, both scalar and vecton Performance will be analyzed and implementation complexity sized and optimized. Comparisons will be made to conventional approaches. Strawman architectures will also be derived. If the Phase I program is successful ViaSat will clearly show that a PSP based CCI suppression scheme is practical and that it can take full advantage of existing commercial technology. BENEFITS: These PSP CCI suppression techniques offer the potential to greatly enhance the number of users and/or cell packing density through improved frequency reuse on commercial TDMA cellular systems. These same techniques can reduce in-band interference for many emerging military communications systems as well as enhance signal collection schemes. KEYWORDS: PER SURVIVOR PROCESSING CELLULAR COMMUNICATIONS CO-CHANNEL INTERFERENCE TIME DIVISION MULTIPLE

To: engineer who wrote (15696)	9/29/1998 11:56:00 AM
From: tero kuittinen	Read Replies (2) \| Respond to of 152472

Engineer, all CDMA phones on market have lousy specs. That was the point. Nokia's GSM and TDMA phones have ten times higher stand-by times than Nokia's CDMA phones, they are lighter, have more functions, etc. This discrepancy between CDMA and GSM phones is endemic. You can also see it in Sony's offerings. So the likelyhood that CDMA will meet its long-term growth estimates is low - these projections never took into account a major quality gap among handsets. Tero