Adaptive Subcarrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Downlink OFDM Using Uplink Delay Spread

URI http://harp.lib.hiroshima-u.ac.jp/hiroshima-cu/metadata/4060
File
Title
Adaptive Subcarrier Block Modulation with Differentially Modulated Pilot Symbol Assistance for Downlink OFDM Using Uplink Delay Spread
Author
氏名 AHN Chang-Jun
ヨミ アン チャンジュン
別名 安 昌俊
氏名 TAKAHASHI Satoshi
ヨミ タカハシ サトシ
別名 高橋 賢
氏名 HARADA Hiroshi
ヨミ ハラダ ヒロシ
別名 原田 博司
氏名 KAMIO Yukiyoshi
ヨミ カミオ ユキヨシ
別名 神尾 享秀
氏名 SASASE Iwao
ヨミ ササセ イワオ
別名 笹瀬 巌
Subject
DMPSA-ASMS/OFDM
MLI
coherence bandwidth
RMS delay spread
Abstract

In AMS/OFDM systems, 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 must have correlation which depends on the coherence bandwidth of the channel Bc. 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.

Description Peer Reviewed
Journal Title
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Volume
E88-A
Issue
7
Spage
1889
Epage
1896
Published Date
2005-07-01
Publisher
電子情報通信学会(IEICE)
ISSN
0916-8508
NCID
AA10826239
Language
eng
NIIType
Journal Article
Text Version
出版社版
Rights
copyright©2005 IEICE
Relation URL
Old URI
Set
hiroshima-cu