期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2012
卷号：2
期号：11
出版社：S.S. Mishra
摘要：In these days Wireless Broadband Technologies allow simultaneous delivery of voice, data and video over fixed or mobile platforms. WiMax 4G, Orthogonal Frequency Division Multiplexing (OFDM), Interleave Orthogonal Frequency Division Multiplexing (IOFDM) are some of the emerging broadband technologies. The paper is divided into two parts channel estimation and channel response. In the channel estimation part, estimation of the channel transfer function in the preamble using MLS method is down. The channel length is varying and the Doppler frequency is fixed. The effects of varying channel length are shown on different modulation technique and also seen channel responses. At high SN, both methods reach an error floor due to the residual error produced by the ICI. This paper develop robust and low complexity channel estimation algorithms and compare different modulation technique for OFDMA reuse1 systems, which are in compatible with the IEEE 802.16e standard. In this paper, the effect of varying channel length and the impulse response of the different varying channels for different modulation techniques are shown. We get that, the QAM is better than other used modulation techniques for varying channel length
