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- W2127850651 abstract "Using asymptotic analysis, we study the effect of frequency-flat fading on code division multiple access (CDMA) systems with linear receivers and random spreading sequences. Specifically, we let the number of users grow without bound, while the ratio of number of users to spreading sequence length is kept fixed to a value /spl alpha/. We treat separately the cases of slow fading (nonergodic channel) and of fast fading (ergodic channel). For the former channel, we derive the outage probability, while for the latter we compute the channel capacity. In both cases, multiple classes of users with different qualities of service are dealt with. As /spl alpha//spl rarr//spl infin/, the system throughput tends to the same limit of 1.44 bit/symbol as for the nonfading channel with both single-user matched filter (SUMF) and linear minimum mean-square-error (MMSE) receivers. The outage probability exhibits a floor for all /spl alpha/ with the SUMF receivers, while with MMSE receiver the floor is present only for /spl alpha/>1. We also address the tradeoffs involved in the allocation of available bandwidth between spreading and coding." @default.
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- W2127850651 date "2001-01-01" @default.
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- W2127850651 title "How fading affects CDMA: an asymptotic analysis with linear receivers" @default.
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- W2127850651 doi "https://doi.org/10.1109/49.914497" @default.
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