NDLI: Adaptive subcarrier block modulation with differentially modulated pilot symbol assistance for downlink OFDM using uplink delay spread

Content Provider	IEEE Xplore Digital Library
Author	Chang-Jun Ahn Takahashi, S. Harada, H.
Copyright Year	2005
Description	Author affiliation: Nat. Inst. of Inf. & Commun. Technol., Yokosuka (Chang-Jun Ahn; Takahashi, S.; Harada, H.)
Abstract	In an AMS/OFDM system, base station is in control of the modulation level of each subcarrier, and then, adaptive modulated packet is transmitted from the base station to the mobile station. In this case, the mobile station is required the modulation level information (MLI) to demodulate the received packet. The MLI is generally transmitted as a data symbol, therefore, the throughput is degraded. In an OFDM, the channel response at a particular subcarrier frequency is not supposed to be totally different from its neighboring frequencies, and hence, they mast have correlation which depends on the coherence bandwidth of the channel $B_{c}.$ If we could assign the same modulation level for coherently faded subcarrier block, MLI is required only one time for each subcarrier block. Moreover, we can assign the data on the empty space of pilot signals for increasing the total transmission. In this paper, we propose an adaptive subcarrier block modulation with differentially modulated pilot symbol assistance for downlink OFDM using uplink delay spread
Starting Page	1125
Ending Page	1129
File Size	2200580
Page Count	5
File Format	PDF
ISBN	9783800729098
DOI	10.1109/PIMRC.2005.1651616
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-11
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM modulation Downlink Delay Base stations Control systems Programmable control Adaptive control Throughput Degradation Bandwidth
Content Type	Text
Resource Type	Article

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