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IEICE TRANSACTIONS on Communications

Adaptive Modulated OFDM Radio Transmission Scheme Using a New Channel Estimation Method for Future Broadband Mobile Communication Systems

Hiroshi HARADA, Takako YAMAMURA, Yukiyoshi KAMIO, Masayuki FUJISE

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Summary :

An adaptive modulated orthogonal frequency division multiplexing (OFDM) radio transmission scheme that enables efficient data transmission in multipath fading environments is newly proposed. This scheme can be used in standardized multimedia mobile access systems such as ETSI-BRAN, and ARIB-MMAC. It is based on estimating the delay spread and the carrier-to-noise power density ratio (C/N0). The estimation is done using channel estimation symbols that are inserted into the frames of the standard OFDM radio transmission scheme. Computer simulations show that the estimation method results in an average BER close to those when propagation characteristics are perfectly estimated. Furthermore, when the adaptive OFDM transmission scheme is based on BPSK, QPSK or 16 QAM, the average BER is almost close to that when BPSK-OFDM is only used, and the average transmission rate is 1.8 times as high. Using an error-correction code based on convolutional code results in an average BER lower than that with the BPSK- and QPSK-OFDM schemes.

Publication
IEICE TRANSACTIONS on Communications Vol.E85-B No.12 pp.2785-2796
Publication Date
2002/12/01
Publicized
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DOI
Type of Manuscript
PAPER
Category
Wireless Communication Technology

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