Computationally efficient bounds for the performance of direct-sequence spread-spectrum multiple-access communications systems in jamming environments

Nazari, N.; Ziemer, Rodger E.

doi:10.1109/26.1473

Cited by 32 publications

(7 citation statements)

References 16 publications

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“…This suggests that one needs to include the effect of the interference in evaluating the performance of an acquisition scheme in a multiple-access environment in order to obtain more accurate assessment. Precision of the numerical results can be verified by comparing the performance curves to upper and lower bounds obtained using the methods of [17,18]. Our experience indicates that when the p.d.f.…”

Section: N U M E R I C a L R E S U L T S And Discussionmentioning

confidence: 90%

Performances of acquisition schemes for CDMA systems with complex signature sequences

Ozluturk

Tantaratana

1995

Int J Wireless Inf Networks

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This paper investigates the acquisition performance of code-division multiple-access communication systems using deterministic complex signature sequences. Unlike most earlier studies, performances are obtained in the presence of multiple user interference, and the results can be applied to complex as well as binary signature sequences. Two serial search acquisition schemes are considered. The first scheme assumes that there is no data in the reference user's signal until the acquisition is achieved. The second scheme allows data modulation in the reference user's signal during the acquisition process. Probability of detection and probability of false alarm of both schemes are obtained without using the Gaussian approximation. Instead, a discrete approximation of the probability density function of the MUI is used in performance evaluations. Numerical results are presented for example sets of Gold, 4-phase, and FZC sequences. They show that complex and binary sequences have comparable acquisition performances. Results also show significant degradation of acquisition performances as the number of users increases.

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Section: N U M E R I C a L R E S U L T S And Discussionmentioning

confidence: 90%

Performances of acquisition schemes for CDMA systems with complex signature sequences

Ozluturk

Tantaratana

1995

Int J Wireless Inf Networks

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“…Partial correlation effects were investigated in [2]. Tight bounds, rather than averages, on bit m o r probability in a BPSK DSSS/MA system with jamming were presented in [3]. This complexity.…”

Section: Introductionmentioning

confidence: 99%

“…shifted convolutions as described by[3]. For case of all users having equal powers, this results in and -1…”

mentioning

confidence: 99%

“…m. DECISION STATISTIC FOR W A D E D OR RAYLEIGH FADING USER IN RAYLEIGH FADING MA INTERFEMNCE Let the multiple-access fading for user k be represented by the Rayleigh random variable Gp Then where Write the multiple-access term y,@J in terms of the partial cross-correlation functions of the spreading code: Define new random variables and where A = min[G(ej,G(ek + i)] (11) and B equals n u u~ over the same expression. With equal powers for all users, Defining where Gk cos $k -N(0, $&, the decision statistic becomesThe goal is to bound the bit error probability using the bounding technique in[3]. This requires knowledge of the probability density function @df) of Z, fi(z), which is derived next.…”

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confidence: 99%

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Performance measures for satellite-to-land-mobile communication systems using spread spectrum

Bergström¹,

Ziemer²

Proceedings of IEEE Vehicular Technology Conference (VTC)

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Absbract:A direct-sequence spread-spectrum satellite-Wand-mobile communications system is analyzed with respect to fading/multipath effects in Rayleigh or R i c h faded multiple-access environment with an unfaded, Rayleigh, and Riaan faded desired user. Numerical results employing Gold codes of lengths 31 and 127 for all three fading cases of the desired user are presented in terms of tight lower and upper bounds of the bit error probability as wen as user capacity. The latter performance measure is represented by the minimum required SNR for a specified acceptable bit error probability versus the number of users in the system. Conclusions on the fadinglmultipath effect on the number of simultaneous users of the satellite-toland-mobile communications system are drawn from the numerical results.

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“…A wide varity of jamming environment and noisy/fading channel have been studied and methods of analysis or simulation are presented in literatures [9]. With increasing interest in CDMA techniques, especially the form of SSMA, it is quite natural to anticipate that more and more systems will be implemented by adapting SSMAiCDMA techniques.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation for multiple DSSS systems with channel bands overlapped

Chen

Lee²,

Wu³

Proceedings of PIMRC '96 - 7th International Symposium on Personal, Indoor, and Mobile Communications

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This paper conducts performance evaluation for a code division multiple access (CDMA) system which is interfered by another neighboring CDMA system. Both systems are assumed to adopt direct-sequence spreadspectrum (DSSS) techniques and have the same carrier frequency. Automatic power control (APC) is assumed to be implemented in the interferred system such that all the users deliver the same power to the receiver. While the total power contributed by the interfering system is normalize'd with the received power of a user of the interfered system. Approximation of the signal to noise ratio (SNR) is derived by which analysis of the performance figure can be achieved with least expensive computational cost. By conducting a variety of analyses showing that our analytical formulation is very close to simulation result under certain conditions.

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Computationally efficient bounds for the performance of direct-sequence spread-spectrum multiple-access communications systems in jamming environments

Cited by 32 publications

References 16 publications

Performances of acquisition schemes for CDMA systems with complex signature sequences

Performances of acquisition schemes for CDMA systems with complex signature sequences

Performance measures for satellite-to-land-mobile communication systems using spread spectrum

Performance evaluation for multiple DSSS systems with channel bands overlapped

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