Presentation	2003/6/13 Experimental Evaluations of Optimum Spreading Factor Values in Forward Link for VSF-OFCDM Broadband Wireless Access Employing Two-dimensional Spreading Noriyuki Maeda, Yoshihisa Kishiyama, Kenichi Higuchi, Hiroyuki Atarashi, Mamoru Sawahashi,
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Abstract(in English)	This paper presented the optimum spreading factors in the time and frequency domains, SF_, ,SF_, for VSF-OFCDM (Variable Spreading Factor-Orthogonal Frequency and Code Division Multiplexing) broadband wireless access with two-dimensional spreading prioritizing time domain spreading by the implemented base and mobile stations equipments. Experimental results elucidated that the when QPSK data modulation was used, the required average received E_s/N_0 (signal energy per symbol-to-noise power spectrum density ratio) was reduced most at the SF_ x SF_=4 x 4 for 15 code multiplexing, and meanwhile, by increasing SF_ to 16, it was reduced by approximately 2 dB compared to that with SF_ x SF_=16 x 1 assuming total spreading factor is 16. Moreover, it was also clarified that when 16 QAM modulation was used, although the required average received E_s/N_0 was reduced by increasing SF_ value to 16 for 4 code multiplexing, the use of only time-domain spreading SF_ x SF_=16 x 1 was much superior for 15 code multiplexing case.
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Keyword(in English)	broadband wireless access / forward link / VSF-OFCDM / two-dimensional spreading
Paper #	CS2003-44,RCS2003-68
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Committee	CS
Conference Date	2003/6/13(1days)
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Paper Information
Registration To	Communication Systems (CS)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	Experimental Evaluations of Optimum Spreading Factor Values in Forward Link for VSF-OFCDM Broadband Wireless Access Employing Two-dimensional Spreading
Sub Title (in English)
Keyword(1)	broadband wireless access
Keyword(2)	forward link
Keyword(3)	VSF-OFCDM
Keyword(4)	two-dimensional spreading
1st Author's Name	Noriyuki Maeda
1st Author's Affiliation	Wireless Laboratories, NTT DoCoMo, Inc.()
2nd Author's Name	Yoshihisa Kishiyama
2nd Author's Affiliation	Wireless Laboratories, NTT DoCoMo, Inc.
3rd Author's Name	Kenichi Higuchi
3rd Author's Affiliation	Wireless Laboratories, NTT DoCoMo, Inc.
4th Author's Name	Hiroyuki Atarashi
4th Author's Affiliation	Wireless Laboratories, NTT DoCoMo, Inc.
5th Author's Name	Mamoru Sawahashi
5th Author's Affiliation	Wireless Laboratories, NTT DoCoMo, Inc.
Date	2003/6/13
Paper #	CS2003-44,RCS2003-68
Volume (vol)	vol.103
Number (no)	126
Page	pp.pp.-
#Pages	8
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