| A novel OFDM transmission scheme with length-adaptive Cyclic Prefix |
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| 作者姓名： | 张朝阳 赖利峰 |
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| 作者单位： | Institute of Information and Communication Engineering，Zhejiang University，Hangzhou 310027，China，Institute of Information and Communication Engineering，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | Project supported by the National Natural Science Foundation of
China (No. 60002003) and the Hi-Tech Research and Develop-
ment Program (863) of China (No. 2002AA123044) |
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| 摘 要： | INTRODUCTION In broadband wireless communication, thdelay spread caused by channel multi-path fadinwill usually introduce serious Inter-Symbol Interference (ISI) to the receiver. To counteract the ISIthe high-efficiency Orthogonal Frequency DivisioMultiplexing (OFDM) modulation first splits thhigh-rate data stream into a number of parallesub-streams and modulates them onto differenorthogonal sub-carriers and thus lower the symborate, and then add a Cyclic Prefix (CP) to the h…
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A novel OFDM transmission scheme with length-adaptive Cyclic Prefix |
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| ZHANG Zhao-yang ?,LAI Li-feng.A novel OFDM transmission scheme with length-adaptive Cyclic Prefix[J].Journal of Zhejiang University Science,2004(11). |
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| Authors: | ZHANG Zhao-yang ? LAI Li-feng |
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| Abstract: | Conventional OFDM transmission system uses a fixed-length Cyclic Prefix to counteract Inter-Symbol Inter- ferences (ISI) caused by channel delay spreading under wireless mobile environment. This may cause considerable per- formance deterioration when the CP length is less than the channel RMS delay spread, or may decrease the system power and spectrum efficiency when it is much larger. A novel Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme is proposed in this paper to adapt the CP length to the variation of channel delay spread. AOFDM-VCPL utilizes the preamble or pilot sub-carriers of each OFDM packet to estimate the channel RMS delay spread; and then uses a criterion to calculate the CP length , which finally affects the OFDM transmitter. As illustrated in the simulation section, by deploying this scheme in a typical wireless environment, the system can transmit at data rate 11.5 Mb/s higher than conventional non-adaptive system while gaining a 0.65 dB power saving at the same BER performance. |
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| Keywords: | Adaptive OFDM Cyclic Prefix RMS delay spread |
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