Effects of filtering on the performance of QPSK and MSK modulation in D-S spread spectrum systems using RAKE receivers

Salt, J.E.; Kumar, S.

doi:10.1109/49.286677

Cited by 23 publications

(15 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using a numerical integration, we obtain . Substituting it into (17) we arrive at (21) Though this is less than Holtzman's original result [7] ( 22) where proper normalization of and was used to render them disappear, Morrow [20] showed there is little loss in accuracy by retaining only the second-order term , which is exactly the same as ours.…”

Section: A Rectangular Pulsesupporting

confidence: 45%

“…We now return to our problem. The mean of is given by (16) while the variance is given by (17) where we have assumed the interference arising from distinct users to be mutually independent. An alternative to SIGA was proposed by Cho et al [25], [30] which is based on the Taylor series expansion of (14) and requires the calculation of high-order moments of .…”

Section: Improved Gaussian Approximationmentioning

confidence: 99%

“…Since and its shifted versions in frequency by a multiple of do not overlap, those terms for in (13) vanish. Therefore, (16) and (17) reduce to (23) This class has practical applications, such as the IS-95 system, as well as IS-2000. Fig.…”

Section: B Band-limited Pulsesmentioning

confidence: 99%

See 2 more Smart Citations

Performance evaluation for band-limited ds-cdma systems based on simplified improved gaussian approximation

Zang

Ling

2003

IEEE Trans. Commun.

View full text Add to dashboard Cite

The standard Gaussian approximation (SGA) for error analysis of direct-sequence code-division multiple-access (DS-CDMA) systems is very optimistic in many cases. Improved Gaussian approximation (IGA) is a technique that produces accurate error probabilities, but is still computationally intensive. Simplified IGA (SIGA) has complexity similar to that of SGA and, at the same time, provides sufficient accuracy. In this paper, we consider SIGA for DS-CDMA systems employing random sequences in a band-limited scenario. The validity of IGA for band-limited systems is established in a rigorous mathematical sense. Then a key parameter in SIGA is derived via a frequency-domain approach. Applications to a number of typical chip waveforms, including the popular sinc and raised-cosine pulses, are investigated. Performance comparison with IGA-based lower and upper bounds shows that SIGA yields very accurate probability of error.

show abstract

Section: A Rectangular Pulsesupporting

confidence: 45%

Section: Improved Gaussian Approximationmentioning

confidence: 99%

See 1 more Smart Citation

Performance evaluation for band-limited ds-cdma systems based on simplified improved gaussian approximation

Zang

Ling

2003

IEEE Trans. Commun.

View full text Add to dashboard Cite

show abstract

“…Since h k is a Rayleigh distributed random variable defined in Equation 9 and ∆ k is uniformly distributed in [0, 2π), the complex-valued random variable, h k e j∆ k , is complex Gaussian distributed with zero-mean and variance of 2σ 2 k [26], [28]. Hence I k is Gaussian distributed conditioned on X k as follows:…”

Section: A Accurate Analysismentioning

confidence: 99%

Exact BER performance of asynchronous DS-CDMA systems using quadriphase spreading and QPSK modulation over rayleigh channels

Liu

Hanzo

2006

IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006.

View full text Add to dashboard Cite

Abstract-An accurate closed-form expression is derived for calculating the average BER in an asynchronous DS-CDMA system using random complex-valued spreading sequences for transmission over Rayleigh channels. This accurate solution is based on the Characteristic Function (CF) approach and only requires a single numerical integration. Our numerical simulation results verify its accuracy, and also demonstrate the relative inaccuracy of the Gaussian approximation.

show abstract

“…To avoid the complexity of the accurate BER analysis and the inaccuracy of various approximations, the SNR performance was investigated in [12], [20], [24].…”

Section: Introductionmentioning

confidence: 99%

Accurate BER Analysis of QPSK Modulated Asynchronous DS-CDMA Systems Communicating over Rayleigh Channels

Liu

Hanzo

2006 IEEE 63rd Vehicular Technology Conference

View full text Add to dashboard Cite

Abstract-The accurate average BER calculation of an asynchronous DS-CDMA system using random spreading sequences is studied in Rayleigh fading channels. An accurate closedform expression is derived for the conditional characteristic function of the multiple access interference. An accurate BER expression is provided, which only requires a single numerical integration. Our numerical simulation results verify its accuracy, and also demonstrate the relative inaccuracy of the Gaussian approximation.

show abstract

Effects of filtering on the performance of QPSK and MSK modulation in D-S spread spectrum systems using RAKE receivers

Cited by 23 publications

References 14 publications

Performance evaluation for band-limited ds-cdma systems based on simplified improved gaussian approximation

Performance evaluation for band-limited ds-cdma systems based on simplified improved gaussian approximation

Exact BER performance of asynchronous DS-CDMA systems using quadriphase spreading and QPSK modulation over rayleigh channels

Accurate BER Analysis of QPSK Modulated Asynchronous DS-CDMA Systems Communicating over Rayleigh Channels

Contact Info

Product

Resources

About