Paper Info
Title
Quadriphase DS-CDMA with pulse shaping and the accuracy of the Gaussian approximation for matched filter receiver performance analysis
Abstract
Probability of bit-error (Pe) performance of asynchronous direct-sequence code-division multiple-access (DS-CDMA) systems is analyzed. In particular, the effects of pulse shaping, quadriphase (or direct-sequence quadriphase shift keying (DS-QPSK)) spreading, aperiodic spreading sequences and the coherent correlator or, equivalently, the matched filter (MF) receiver are considered. An exact Pe expression and several approximations: one using the characteristic function (CF) method, a simplified expression for the improved Gaussian approximation (IGA) and the simplified improved Gaussian approximation (SIGA) are derived. Two main results are presented. Under conditions typically satisfied in practice and even with a small number of interferers, the standard Gaussian approximation (SGA) for the multiple-access interference component of the MF statistic and for MF Pe performance is shown to be accurate. Moreover, the IGA is shown to reduce to the SGA for pulses with zero excess bandwidth. Second, the Pe performance of quadriphase DS-CDMA is shown to be superior or equivalent to that of biphase DS-CDMA. Numerical examples with Monte Carlo simulation are presented to illustrate Pe performance for square-root raised-cosine (Sqrt-RC) pulses and spreading factors of moderate to large values.
Year
DOI
Venue
2002
10.1109/TWC.2002.804074
Wireless Communications, IEEE Transactions  
Keywords
Field
DocType
Gaussian distribution,Monte Carlo methods,code division multiple access,error statistics,matched filters,radio receivers,radiofrequency interference,spread spectrum communication,telecommunication control,DS-QPSK,Gaussian approximation,IGA,Monte Carlo simulation,SIGA,aperiodic spreading sequences,bit-error performance,characteristic function method,coherent correlator,direct-sequence code-division multiple-access,direct-sequence quadriphase shift keying,matched filter receiver performance analysis,multiple-access interference component,pulse shaping,quadriphase DS-CDMA,quadriphase spreading,simplified improved Gaussian approximation,spreading factors,square-root raised-cosine pulses,standard Gaussian approximation
Monte Carlo method,Characteristic function (probability theory),Algorithm,Real-time computing,Pulse shaping,Bandwidth (signal processing),Interference (wave propagation),Matched filter,Aperiodic graph,Statistics,Mathematics,Spread spectrum
Journal
Volume
Issue
ISSN
1
4
1536-1276
Citations 
PageRank 
References 
14
1.14
13
Authors
1
Name
Order
Citations
PageRank
Y. C. Yoon120324.14