Radio base station apparatus and communication terminal

Details Radio base station apparatus and communication terminal Radio base station apparatus and communication terminal

2007-11-20

2007-11-20

Ngo, Ricky Q (Department: 2609)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S210000, C370S211000

Reexamination Certificate

active

10312870

ABSTRACT:
MS receives a downlink signal transmitted based on a guard interval determined using a delay profile with high accuracy generated based on a CDMA uplink signal, and performs Fourier Transform processing on a preamble portion of the downlink signal to demodulate. Transmission parameters (guard interval, subcarrier frequency interval and the number of subcarriers) contained in the preamble portion are extracted and output to Fourier Transform section303. The section303performs Fourier Transform processing on a data portion based on the extracted transmission parameters. Demodulation section304demodulates signals subjected to the Fourier Transform processing to output as received data. It is thereby possible to generate the delay profile with high accuracy to determine the guard interval, and to ensure transmission quality while improving the spectral efficiency.

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Y. Asai, et al.; “Coded OFDM System using Guard Interval Length Control”, B-5-92, Wireless Systems Innovation Laboratory, NTT Network Innovation Laboratories, pg. 490 w/English translation.

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