New Criteria and Related Techniques for 4G Wireless Systems

Wei Chen

Chairman and CEO of Chongqing WOASiS Technology Inc, ChinaE-mail: weichengw-oasiscom

ABSTRACT Inc., as Chairman and CEO. Later Cwill and ChinaAcademy of Telecommunication Technology (Datang

3G technologies have been widely deployed in Group) jointly setup Beijing Xinwei TelecomEurope, Japan and other countries since 2000. But few Technology Co., Ltd, where he served as CEO and vice3G telecom operators could claim profitable from the chairman. Xinwei was one of pioneers in wirelesscurrent services provided by 3G networks. The real communication standard in China. Based on the Smartissues hit the 3G flying are spectrum efficiency, uplink antenna, Synchronous CDMA, Software Radio andbandwidth and overall cost with CDMA based Macro TDD technologies, the standard was calledtechnology. SCDMA. Dr. Chen was one of the major technical

This presentation, based on SCDMA, TD-SCDMA, contributors for SCDMA technology. Later theand McWill deploying experiences in the last ten years TD-SCDMA, based on SCDMA, was accepted by ITUin China, proposes new criteria for 4G wireless as an international wireless communications standard forcommunication systems. Under the proposed criteria, 3G. He has led his team successfully deployed SCDMAwhat are missing in current wireless communication wireless access system in large scale and made it a firsttheory is addressed. In order to increase the spectrum commercialized wireless standard in China and widelyefficiency and uplink bandwidth in a 4G system, the used in rural area. By the end of 2006, SCDMA haspresentation gives a way to optimally consider more than 4 million subscribers in China and Asia. Tofrequency, time, spatial, and coding domains issues 2005, Xinwei's revenue reached USD 151 millions andaltogether. Most importantly, the presentation points out net profit reached 29 millions. In Sept. 2005, Rednew foundation based on multi-user information theory Herring named Xinwei as one of the 100 strongestfor wireless communications, which might be one of companies in Asia. And then in Dec. 2005, Deloittemany means that can effectively increase spectrum ranked Xinwei as No. 5 among all Chinese high techutilization. companies. In Jan. 2006, Forbes ranked Xinwei as a No.

Uplink bandwidth is a bottleneck for many wireless 2 among 100 most innovative and profitable companies.communication systems. Traditionally, in order to get Dr. Chen was nominated as a "CCTV Man of the Yearhigher bandwidth efficiency, a higher order or in China Economy in 2005" and he was elected as amulti-level modulation (such as QAM 64) should be Chinese National Innovation Figure by Chinesenormally adopted, which requires high output power in government.subscriber terminal side. This talk shows an alternative Currently, Dr. Chen is the Chairman and CEO ofway to handle high bit/symbol rate modulation without Chongqing WOASiS Technology Inc. and a professor inhigh multi-level output power. Institute of Communication Engineering of Chongqing

University, Chongqing, China. His research area is onoptimization and integration of key algorithms in Spatial,

Biography: Coding, Frequency, and Time joint domains for broadDr. Wei Chen received the B.S. band wireless system.degree in Computer Engineeringfrom Chongqing University,China, in 1982, then a M.S. anda Ph.D. in 1988, 1992respectively, both in ElectricalEngineering from Worcester

| 11 E ~~~Polytechnic Institute, Worcester,

l_ _ ~From 1990 to 1994, he was- _ - a Staff Engineer of

Semi-conductor Division of Motorola in Austin, Texas,USA, engaging in the research on the applications ofDSP. In 1994, he founded Cwill Telecommunications,

1-4244-1074-6/07/$25.OO ©)2007 IEEE 3 Proceedings of IWSDA'07