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- W1496323259 abstract "Spreading is used to provide diversity in frequency and results in a number of benefits. However, recent literature has shown that for a channel that decorrelates in time and frequency, the capacity of a wideband system in a fading channel goes to zero in the limit of infinite bandwidth (given second and fourth moment constraints that decay with the spreading bandwidth). We first extend to the two-user case the upper bound from Medard and Tse (Ref.5). Together with a lower bound based on binary transmission, meaningful bounds to the optimal spreading bandwidth using DS-CDMA are obtained. Given typical system and channel parameters, the minimum spreading bandwidth behaves as a linear function of channel strength. We will show that this result can be meaningfully applied as guidelines in the design of future communication systems." @default.
- W1496323259 created "2016-06-24" @default.
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- W1496323259 date "2005-04-12" @default.
- W1496323259 modified "2023-09-27" @default.
- W1496323259 title "How Far Should We Spread Using DS-CDMA in Time and Frequency Selective Fading Channels?" @default.
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- W1496323259 doi "https://doi.org/10.1109/glocom.2003.1258500" @default.
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