Multiple-Access Interference of Gold Codes in a DS-CDMA System
نویسندگان
چکیده
منابع مشابه
Removal of Multiple Access Interference in DS-CDMA System
Multiple access interference (MAI) is a factor which limits the capacity and performance of DS-CDMA systems. MAI refers to the interference between direct-sequence users. This interference is the result of the random time offsets between signals, which make it impossible to design the code waveforms to be completely orthogonal. While the MAI caused by any one user is generally small, as the num...
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This paper investigates the Parallel Interference Cancellation technique in Direct Sequence Optical Code Division Multiple Access (DS-OCDMA) system. In the proposed system, the estimated interference is removed from the received signal. We have developped a new approach to obtain the analytical expression of error probability in chip synchronous case, for Optical Orthogonal Codes (OOC). We have...
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In this paper, we present a comprehensive report on the research work focused on developing a novel concept for reducing Multiple Access Interference (MAI) in Direct Sequence – Code Division Multiple Access (DS-CDMA) systems prevailing in wireless communications. The proposed novel algorithm is developed by using the principles of artificial intelligence based on neural networks. The basic func...
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Multi-carrier code division multiple access (MC-CDMA) technique maintains the original signaling interval while it spreads the signal over wide bandwidth like direct-sequence code division multiple access (DS-CDMA) technique. Low amount of delay spread reduces the guard interval in MC-CDMA and make it power efficient. MC-CDMA is sensitive to frequency offset and small Doppler spread is preferre...
متن کاملDS-CDMA Frequency-domain Multi-access Interference Canceller
あらまし Rake 合成を用いる DS-CDMA では,チャネルの周波数選択性が厳しくなるとパス間干渉が無視できなくなり誤り 率特性が劣化してしまうことが知られている.最近,周波数領域等化(FDE: frequency-domain equalization)技術を適用することで 大幅に誤り率特性を改善できることが分かってきた.しかし,複数ユーザが基地局にアクセスする上りリンクでは,たとえ FDE を用いてもパス間干渉(IPI: Inter-path interference)により大きなMAI(multi-access interference)が発生し,ビット誤り率(BER)特性が 劣化してしまう.また,基地局から各ユーザにアクセスする下りリンクにおいても,ユーザ間の直交性が保たれず BER 特性が 劣化してしまうことが知られている.そこで本論文では,DS-CDMA上り/下りリン...
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ژورنال
عنوان ژورنال: SAIEE Africa Research Journal
سال: 2015
ISSN: 1991-1696
DOI: 10.23919/saiee.2015.8531483