1) The document proposes new criteria for 4G wireless systems based on the author's experience deploying SCDMA and TD-SCDMA technologies in China over the last ten years. 2) It addresses shortcomings in current wireless theory by optimizing considerations of frequency, time, spatial, and coding domains to increase spectrum efficiency and uplink bandwidth. 3) The author highlights new foundations in multi-user information theory that could effectively increase spectrum utilization for 4G wireless systems.

1. New Criteria and Related Techniques for 4G Wireless Systems
Wei Chen
Chairman and CEO of Chongqing WOASiS Technology Inc, China
E-mail: weichengw-oasiscom
ABSTRACT Inc., as Chairman and CEO. Later Cwill and China
Academy of Telecommunication Technology (Datang
3G technologies have been widely deployed in Group) jointly setup Beijing Xinwei Telecom
Europe, Japan and other countries since 2000. But few Technology Co., Ltd, where he served as CEO and vice
3G telecom operators could claim profitable from the chairman. Xinwei was one of pioneers in wireless
current services provided by 3G networks. The real communication standard in China. Based on the Smart
issues hit the 3G flying are spectrum efficiency, uplink antenna, Synchronous CDMA, Software Radio and
bandwidth and overall cost with CDMA based Macro TDD technologies, the standard was called
technology. SCDMA. Dr. Chen was one of the major technical
This presentation, based on SCDMA, TD-SCDMA, contributors for SCDMA technology. Later the
and McWill deploying experiences in the last ten years TD-SCDMA, based on SCDMA, was accepted by ITU
in China, proposes new criteria for 4G wireless as an international wireless communications standard for
communication systems. Under the proposed criteria, 3G. He has led his team successfully deployed SCDMA
what are missing in current wireless communication wireless access system in large scale and made it a first
theory is addressed. In order to increase the spectrum commercialized wireless standard in China and widely
efficiency and uplink bandwidth in a 4G system, the used in rural area. By the end of 2006, SCDMA has
presentation gives a way to optimally consider more than 4 million subscribers in China and Asia. To
frequency, time, spatial, and coding domains issues 2005, Xinwei's revenue reached USD 151 millions and
altogether. Most importantly, the presentation points out net profit reached 29 millions. In Sept. 2005, Red
new foundation based on multi-user information theory Herring named Xinwei as one of the 100 strongest
for wireless communications, which might be one of companies in Asia. And then in Dec. 2005, Deloitte
many means that can effectively increase spectrum ranked Xinwei as No. 5 among all Chinese high tech
utilization. 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 Year
higher bandwidth efficiency, a higher order or in China Economy in 2005" and he was elected as a
multi-level modulation (such as QAM 64) should be Chinese National Innovation Figure by Chinese
normally adopted, which requires high output power in government.
subscriber terminal side. This talk shows an alternative Currently, Dr. Chen is the Chairman and CEO of
way to handle high bit/symbol rate modulation without Chongqing WOASiS Technology Inc. and a professor in
high multi-level output power. Institute of Communication Engineering of Chongqing
University, Chongqing, China. His research area is on
optimization and integration ofkey algorithms in Spatial,
Biography: Coding, Frequency, and Time joint domains for broad
Dr. Wei Chen received the B.S. band wireless system.
degree in Computer Engineering
from Chongqing University,
China, in 1982, then a M.S. and
a Ph.D. in 1988, 1992
respectively, both in Electrical
Engineering 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 of
DSP. In 1994, he founded Cwill Telecommunications,
1-4244-1074-6/07/$25.OO ©)2007 IEEE 3 Proceedings of IWSDA'07