Cognitive-engined spectrum-fragmented synchronous MC-CDMA based on generalized hadamard codes

M. Shoreh, M. J. Khojasteh, Omid Poursaeed, J. Salehi
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引用次数: 0

Abstract

In Cognitive Radio (CR), in order to avoid interference in the Primary Users (PU), some subcarriers need to be deactivated. In systems based on Multicarrier Code Division Multiple Access (MC-CDMA), this causes losing orthogonality among different spreading codes, leading to poor Bit Error Rate (BER) performance. The performance of such system can be improved by using Generalized Hadamard Codes (GHC) instead of conventional Hadamard codes which avoids the loss of orthogonality. This is due to the fact that unlike conventional Hadamard codes, GHC are conjectured to exist for any arbitrary length. In this paper, we propose using a novel spreading code, namely, GHC for synchronous MC-CDMA in CR networks. The new spreading codes help the CR systems maintaining the data rate while improving the performance by eliminating the orthogonality loss. Finally, the performance of the MCCDMA system using GHC is evaluated and it is shown that the proposed system outperform the system with conventional Hadamard codes.
基于广义标准码的认知引擎频谱碎片同步MC-CDMA
在认知无线电(CR)中,为了避免对主用户(PU)的干扰,需要停用一些子载波。在基于多载波码分多址(MC-CDMA)的系统中,这会导致不同的扩频码之间失去正交性,从而导致误码率(BER)性能下降。采用广义阿达玛码(GHC)代替传统的阿达玛码可以提高系统的性能,避免了正交性的损失。这是因为与传统的Hadamard编码不同,GHC被推测存在于任意长度。在本文中,我们提出了一种新的扩频码,即GHC,用于CR网络中的同步MC-CDMA。新的扩频码使CR系统在保持数据速率的同时,通过消除正交性损失来提高性能。最后,对采用GHC码的MCCDMA系统的性能进行了评估,结果表明该系统优于传统Hadamard码系统。
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