Broadband CDMA techniques

被引：195

作者：

Adachi, F ^{[1
]}

Garg, D ^{[1
]}

Takaoka, S ^{[1
]}

Takeda, K ^{[1
]}

机构：

[1] Tohoku Univ, Dept Elect & Comp Engn, Sendai, Miyagi 980, Japan

来源：

IEEE WIRELESS COMMUNICATIONS | 2005年 / 12卷 / 02期

关键词：

D O I：

10.1109/MWC.2005.1421924

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

A very high-speed wireless access of 100 Mb/s to 1 Gb/s is required for fourth-generation mobile communications systems. However, for such high-speed data transmissions, the channel is severely frequency-selective due to the presence of many interfering paths with different time delays. A promising wireless access technique that can overcome the channel frequency-selectivity and even take advantage of this selectivity to improve the transmission performance is CDMA. There may be two approaches in CDMA technique: direct sequence CDMA and multicarrier CDMA. A lot of attention is paid to MC-CDMA. However, recently it has been revealed that DS-CDMA can achieve good performance comparable to MC-CDMA if proper frequency domain equalization is adopted. This article discusses their similarities and performances. A major transmission mode in 4G systems will be packet-based. Automatic repeat request combined with channel coding is a very important technique. Recent research activity on this technique is also introduced.

引用

页码：8 / 18

页数：11

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