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《A road to future broadband wireless access MIMO-OFDM-Based air interface》.pdf
WIRELESS COMMUNICATIONS IN CHINA:
TECHNOLOGY VS. MARKETS
A Road to Future Broadband Wireless
Access: MIMO-OFDM-Based Air Interface
Hongwei Yang, Alcatel Shanghai Bell Co., Ltd.
ABSTRACT 100 Mb/s with CDMA due to excessive interfer-
ence between services. The other is the difficulty
Orthogonal frequency-division multiplexing is of providing a full range of multirate services, all
a popular method for high-data-rate wireless with different quality of service (QoS) and per-
transmission. OFDM may be combined with formance requirements, due to the restrictions
multiple antennas at both the access point and imposed on the core network by the air interfer-
mobile terminal to increase diversity gain and/or ence standard. Therefore, the future mobile
enhance system capacity on a time-varying multi- communication system with features of high-
path fading channel, resulting in a multiple-input data-rate transmission and open network archi-
multiple-output OFDM system. In this article we tecture, called 4G, is desired to satisfy the
give a brief technical overview of MIMO-OFDM increasing demand for broadband wireless
system design. We focus on various research top- access. Hence, 4G refers to a collection of tech-
ics for the MIMO-OFDM-based air interface, nologies and standards that will find their way
including spatial channel modeling, MIMO- into a ra
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