Concatenated coded spreading with coherent demodulation for DS-CDMA

被引：0

作者：

Frey, T ^{[1
]}

Schramm, P ^{[1
]}

机构：

[1] Univ Ulm, Dept Informat Technol, D-89075 Ulm, Germany

来源：

48TH IEEE VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-3 | 1998年

关键词：

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

In DS-CDMA systems, spreading may be viewed as inner coding and user-specific scrambling. In practice, spreading is combined with an outer convolutional code, which leads to so-called concatenated coded spreading (CCS). The standard approach is to use repetition codes. In the IS-95 uplink, a (64,6,32) orthogonal code is defined, which can be interpreted as 64-ary orthogonal modulation. In this paper, a CCS scheme with power efficiency superior to the IS-95 uplink is proposed. The use of decision-directed coherent demodulation for both schemes is discussed, and it will be shown that the coding gain of the improved CCS requires a modified channel estimation scheme.

引用

页码：1910 / 1914

页数：5

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