New quasi-synchronous sequences for CDMA slotted ALOHA systems

被引：0
|
作者：
Saito, M [1 ]
Yamazato, T
Katayama, M
Ogawa, A
机构：
[1] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648603, Japan
[2] Nagoya Univ, Ctr Informat Media Studies, Nagoya, Aichi 4648603, Japan
来源：
IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES | 1998年 / E81A卷 / 11期
关键词：
CDMA slotted ALOHA system; QS-sequences; access timing error; orthogonal Gold sequences; flat fading channel;
D O I：
暂无
中图分类号：
TP3 [计算技术、计算机技术];
学科分类号：
0812 ;
摘要：
One of unique features of COMA slotted ALOHA (CDMA S-ALOHA) is that user must synchronize his transmission to given slot. Thus orthogonal sequence as spreading sequence would achieve ideal throughput if each of packets accomplish perfect synchronization. In the presence of any ambiguity in synchronizations, however, quasi-synchronous (QS) sequences suit well with CDMA S-ALOHA system. In this paper, we introduce new OS-sequences obtained from the orthogonal Gold sequences and discuss their performance when applying to CDMA S-ALOHA systems. As a result, withstanding to access timing error, good performance is ensured with this sequence under the environment of AWGN, MAI (multiple access interference) and frequency non-selective fading, that is, micro or pico cellular systems and indoor wireless LANs.
引用
收藏
页码：2274 / 2280
页数：7
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