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High-Speed Wireless
Communications
Ultra-wideband, 3G Long-Term Evolution, and
4G Mobile Systems
JIANGZHOU WANG
CAMBRIDGE UNIVERSITY PRESS
2008
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爱立信公司（Telefonaktiebolaget LM Ericsson）于1876年成立于瑞典首都斯德哥尔摩。从早期生产电话机、程控交换机发展到今天全球最大的移动通讯设备商，爱立信的业务遍布全球180多个国家和地区，是全球领先的提供端到端全面通信解决方案以及专业服务的供应商。爱立信的全球业务包括：通信网络系统、专业电信服务、专利授权、企业系统、运营支撑系统（OSS）和业务支撑系统（BSS）。爱立信的2G、 3G和4G无线通信网络被世界上各大运营商广泛使用和部署。爱立信还是移动通信标准化的全球
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The next generation of cellular technology is dramatically altering the communications landscape, changing the way people
access information and interact with one another. At the forefront of the new technology is LTE, the long-term evolution
of
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Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communication, used in applications such as digital television and a
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Long-Term Evolution (LTE) is a new standard speci ed by 3GPP for fourth generation (4G)
wireless communications. LTE provides high spectral eciency, high peak data rates, short
round trip time, and frequency
exibility. It relies on the follow
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Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. OFDM has developed into a popular scheme for wideband digital communication, used in applications such as digital television and a
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OFDM技术由MCM（Multi-Carrier Modulation，多载波调制）发展而来。OFDM技术是多载波传输方案的实现方式之一，它的调制和解调是分别基于IFFT和FFT来实现的，是实现复杂度最低、应用最广的一种多载波传输方案。-Orthogonal frequency-division multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. OFDM has de
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