Paper Abstract and Keywords |
Presentation |
2004-06-18 10:05
On selection of OVSF codes for MC-CDMA downlinks Takamichi Inoue, Garg Deepshikha, Fumiyuki Adachi (Tohoku Univ.) |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
In MC-CDMA downlink, orthogonal variable spreading factor (OVSF) codes can be used to allow multirate communications while maintaining the orthogonality among the users with different data rates. In this paper, we point out that simple selection of the OVSF codes results in degraded performance. We show that this happens because simple code selection results in power concentration over certain consecutive subcarriers; severe power loss in the received signal occurs when these subcarriers experience a deep fade in a frequency selective fading channel. In addition, we show two effective techniques to avoid the performance degradation: random code selection and frequency interleaving; which technique provides a better performance depends on modulation levels, code multiplexing order, and presence of channel coding. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
MC-CDMA / MMSE frequency-domain equalization / OVSF code / frequency-selective fading / frequency interleaving / / / |
Reference Info. |
IEICE Tech. Rep., vol. 104, no. 123, RCS2004-78, pp. 13-18, June 2004. |
Paper # |
RCS2004-78 |
Date of Issue |
2004-06-11 (RCS) |
ISSN |
Print edition: ISSN 0913-5685 |
Download PDF |
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Conference Information |
Committee |
RCS |
Conference Date |
2004-06-17 - 2004-06-18 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Tohoku University |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
Error correction, MAC, Wireless communication systems, etc. |
Paper Information |
Registration To |
RCS |
Conference Code |
2004-06-RCS |
Language |
Japanese |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
On selection of OVSF codes for MC-CDMA downlinks |
Sub Title (in English) |
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Keyword(1) |
MC-CDMA |
Keyword(2) |
MMSE frequency-domain equalization |
Keyword(3) |
OVSF code |
Keyword(4) |
frequency-selective fading |
Keyword(5) |
frequency interleaving |
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1st Author's Name |
Takamichi Inoue |
1st Author's Affiliation |
Tohoku University (Tohoku Univ.) |
2nd Author's Name |
Garg Deepshikha |
2nd Author's Affiliation |
Tohoku University (Tohoku Univ.) |
3rd Author's Name |
Fumiyuki Adachi |
3rd Author's Affiliation |
Tohoku University (Tohoku Univ.) |
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Speaker |
Author-1 |
Date Time |
2004-06-18 10:05:00 |
Presentation Time |
25 minutes |
Registration for |
RCS |
Paper # |
RCS2004-78 |
Volume (vol) |
vol.104 |
Number (no) |
no.123 |
Page |
pp.13-18 |
#Pages |
6 |
Date of Issue |
2004-06-11 (RCS) |