Inter-code interference and optimum spreading sequence in frequency-selective Rayleigh fading channels on uplink MC-CDMA

被引：0

作者：

Shono, T ^{[1
]}

Yamada, T

Kobayashi, K

Araki, K

Sasase, I

机构：

[1] NTT Corp, NTT Network Innovat Labs, Yokosuka, Kanagawa 2390847, Japan

[2] Keio Univ, Fac Sci & Technol, Yokohama, Kanagawa 2238522, Japan

来源：

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES | 2004年 / E87A卷 / 08期

关键词：

MC-CDMA; OFDM; inter-code interference; desired-to-undesired signal power ratio; spreading sequence;

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：

In uplink multicarrier code division multiple access (MCCDMA), the inter-code interference (ICI) caused by the independent and frequency-selective fading channel of each user and the inter-carrier interference caused by the asynchronous reception of each user's OFDM symbols result in multiple access interference (MAI). This paper evaluates the ICI in frequency-selective Rayleigh fading channels for uplink MCCDMA. We derive theoretical expressions for the desired-to-undesired signal power ratio (DUR) as a quantitative representation of ICI, and validate them by comparison with computer simulations using a Walsh-Hadamard (WH) code. Based on the analytical results, we obtain the optimum spreading sequence that minimizes the ICI (in short, maximizes the multiplexing performance); this sequence appears to be orthogonal. Three equalization combining methods are examined; equal gain combining (EGC), orthogonality restoring combining (ORC), and maximum ratio combining (MRC).

引用

页码：1981 / 1993

页数：13

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