NDLI: OVSF code allocation and two-stage combining method to reduce inter-code interference in OFCDM system

Content Provider	IEEE Xplore Digital Library
Author	Hasegawa, K. Shimura, R. Ohno, T. Yoshimochi, N. Sasase, I.
Copyright Year	2005
Description	Author affiliation: Dept. of Inf. & Comput. Sci., Keio Univ., Yokohama (Hasegawa, K.; Shimura, R.; Ohno, T.; Yoshimochi, N.; Sasase, I.)
Abstract	In this paper, we propose an OVSF code allocation at a base station and a two-stage combining method at a receiver to reduce inter-code interference in OFCDM system. In the proposed OVSF code allocation, OVSF codes which have different ancestor codes are allocated to users. If allocated codes are divided into chips shorter than spreading factor, chips which are produced by each allocated codes are orthogonal. In the two-stage combining method, the allocated code is divided into chips and received symbols are despread using chips. Demodulated symbols are produced from the despreading, multiplied by weights, and combined. The combining method of the proposed scheme has two stages. The first stage is the despreading, and the second stage is the weight combining. The proposed scheme uses few sub-carriers among which a difference of amplitude levels is small at the despreading, and combines demodulated symbols at the weight combining using suitable weights. Thus, the proposed scheme can reduce inter-code interference. We show that the proposed scheme achieves better BER performance than the conventional scheme by computer simulations
Starting Page	2500
Ending Page	2504
File Size	886697
Page Count	5
File Format	PDF
ISBN	9783800729098
DOI	10.1109/PIMRC.2005.1651893
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	Interference Frequency domain analysis Bit error rate Multiaccess communication Computer simulation Multicarrier code division multiple access Radio link OFDM modulation Computer science Base stations
Content Type	Text
Resource Type	Article

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