Space-time spreading and diversity in asynchronous CDMA systems over frequency-selective fading channels

Assra, Ayman; Hamouda, Walaa; Youssef, Amr M.

doi:10.1109/isspa.2007.4555515

Cited by 1 publication

(4 citation statements)

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“…cos . [66] and after some algebraic manipulations, the conditional SINR expression can be obtained as…”

Section: Systems Over Frequency-selective Multipath Channelsmentioning

confidence: 99%

“…Recently, some efforts have aimed at the integration of STC with direct-sequence code-division multiple-access (DS-CDMA) systems over frequency-selective fading channels [37]. In [66], it was…”

Section: Introductionmentioning

confidence: 99%

“…shown that for the space-time transmit diversity scheme with two transmitter antennas, one receiver antenna and L p resolvable multipaths over a frequency-selective Rayleigh fast fading channel, a full diversity-order of 2 2 p L × can be achieved with decorrelator detector. Motivated by [23] and [64]- [66], we perform BER analysis of this transmit diversity scheme for the case of band-limited DS-CDMA systems. We consider a synchronous as well as asynchronous band-limited DS-CDMA system over flat and frequency-selective generalized-K fading channels.…”

Section: Introductionmentioning

confidence: 99%

“…At the receiver side, each l A -th antenna has a bank of 2L r filters matched to the delayed versions of the desired user signal, where r p L L≤ . After down-conversion and demodulation, the signal for the l A -th receive antenna can be written in a matrix form as[66]…”

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confidence: 99%

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Performance analysis of band-limited DS-CDMA systems over generalized-k fading channels.

Mehdi¹

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Direct-sequence spread-spectrum (DS-SS) has attracted considerable attention and has been adopted by many wireless communication vendors. Well-known communication systems employing DS-SS are based on the code-division multiple-access (CDMA) technique, such as global positioning system (GPS), wideband CDMA (WCDMA) system, etc. In practice, wireless channels are commonly modeled as a mixture of fading and shadowing. Various composite models have been reported in the literature. These models are based on lognormal distributions. The main disadvantage of these models is that they are mathematically complicated to analyze. Hence, the lognormal shadowing was approximated by a gamma shadowing leading to the K distribution and its generalized version, i.e., generalized-K distribution. This versatile distribution is useful in evaluating the performance of composite channels with simplicity and mathematical tractability. The BER performance of DS-CDMA systems has been extensively studied during the last two decades. However, most of the reported work is focused on DS-CDMA systems with rectangular pulse-shaping, while in practice, band-limited pulse shapes are adopted. Therefore, the performance analysis of band-limited systems is of considerable interest, and has gained some interest in the recently published literature. The aim of this research is to analyze the BER performance of band-limited DS-CDMA systems over composite small-scale fading and shadowing channels. We consider generalized-K distribution in our BER analysis. We study conventional matchedfilter based systems as well as decorrelator based multiuser detection systems. We consider both flat and frequency-selective multipath fading channels. Systems with

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“…cos . [66] and after some algebraic manipulations, the conditional SINR expression can be obtained as…”

Section: Systems Over Frequency-selective Multipath Channelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Performance analysis of band-limited DS-CDMA systems over generalized-k fading channels.

Mehdi¹

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Space-time spreading and diversity in asynchronous CDMA systems over frequency-selective fading channels

Cited by 1 publication

References 11 publications

Performance analysis of band-limited DS-CDMA systems over generalized-k fading channels.

Performance analysis of band-limited DS-CDMA systems over generalized-k fading channels.

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