版权所有:内蒙古大学图书馆 技术提供:维普资讯• 智图
内蒙古自治区呼和浩特市赛罕区大学西街235号 邮编: 010021
作者机构:Tech Univ Carolo Wilhelmina Braunschweig Dept Telecommun D-38092 Braunschweig Germany
出 版 物:《PROCEEDINGS OF THE IEEE》 (电气与电子工程师学会会报)
年 卷 期:1999年第87卷第10期
页 面:1778-1789页
核心收录:
主 题:better differential modulation broad-band communication convolutional codes differential amplitude and phase shift keying modulation modulation coding multimedia systems orthogonal frequency division multiplexing (OFDM)
摘 要:Future multimedia services will require the transmission of very high data rates over broad-band radio channels. In order to provide these services to mobile users, anl appropriate transmission technique has to cope with frequency-selective and time-variant radio channels. The computation complexity for an equalizer increases in a frequency-selective radio channel for high data-rate applications. Furthermore, the overhead for channel estimation procedures increases in time-variant channels. To overcome these drawbacks orthogonal frequency division multiplexing (OFDM) has been considered for broad-band applications in many publications. The objective of this paper is to describe the large potential, the flexibility and adaptivity of the OFDM transmission technique in frequency-selective and time-variant radio channels. In this paper several technical aspects of OFDM transmission systems are discussed, especially the topics of differential modulation for which we compare different demodulation methods and channel coding with soft decision decoding. For higher level differential modulation, multilevel coding is taken into consideration.