On the use of a suppression filter for CDMA overlay

Wang, J.

doi:10.1109/25.752564

Cited by 31 publications

(7 citation statements)

References 31 publications

(20 reference statements)

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“…A well defined closed formula for the BER for each type of NBI is provided. The obtained results matches the results obtained in [4] for the case of BPSK NBI, moreover, this work is extended to cover the single tone NBI. Also, the comparison between the double sided and single sided filters in mitigating the effect of the two proposed NBIs is analyzed when the carrier of the NBI does not coincide with the carrier of the DS-CDMA signal.…”

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confidence: 84%

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Narrowband Interference Cancellation in DS-CDMA System Using a Suppression Filter

Hanafy

Elbarbary

Bakr

et al. 2012

The International Conference on Electrical Engineering

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In this paper the performance of the DS-CDMA system employing a suppression filter for rejection of narrow band interference (NBI) is provided. Two types of NBI, namely the binary phase shift keying (BPSK) and the single tone interferences, are considered. The behavior of the DS-CDMA system with and without a suppression filter over a Raleigh fading channel and under the effect of the two types of NBI is analyzed. The effects of suppression filter coefficients, DS-CDMA system parameters, and the NBI parameters on the performance of the system are evaluated analytically. It is shown that the suppression filter is more effective against the single tone NBI than in the case of the BPSK NBI. Moreover, it is proved that using a suppression filter with total three taps is sufficient to mitigate the effect of either the BPSK or single tone NBI.

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supporting

confidence: 84%

“…The second term j k I , is the multiple access interference (MAI) term due to the j th user ( ) j k≠ and it is given by [4]…”

Section: System Modelmentioning

confidence: 99%

Narrowband Interference Cancellation in DS-CDMA System Using a Suppression Filter

Hanafy

Elbarbary

Bakr

et al. 2012

The International Conference on Electrical Engineering

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“…Interference suppression filter (SF) can be employed to reject the narrow-band interference. A wiener-type filter, described in [3], employs a tapped delay line structure to first predict and then subtract out the narrow-band interference. The technique of diversity combining can provide an attractive means for improving system performance by utilizing the signal components of different uncorrelated paths.…”

Section: Introductionmentioning

confidence: 99%

Effect of Diversity and Filtering on the Performance of Wavelet Packets Base Multicarrier Multicode CDMA System

Akho-Zahieh¹,

Abdellatif²

2015

JSIP

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In Wavelet Packets Based Multicarrier Multicode CDMA system, the multicode (MCD) part ensures the transmission for high speed and flexible data rate, the multicarrier (MC) part ensures the flexibility of handling multiple data rates, and wavelet packets modulation technique contributes to the mitigation of the interference problems. The CDMA system can suppress a given amount of interference. In this paper, the receiver employs suppression filter (SF) to mitigate the effect of narrow-band jammer interference and diversity techniques to reduce multiple access interference. The framework for the system and the performance evaluation are presented in terms of bit error rate (BER) over a Nakagami fading channel. Also, we investigate how the performance is influenced by various parameters, such as the number of taps of the SF, the ratio of narrow-band interference bandwidth to the spread-spectrum bandwidth, the diversity order, the fading parameter and so on. Finally, the performance of the system is compared with the performance Sinusoidal (Sin) based MC/MCD CDMA system.

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“…That is, the spectrally overlapping DSSS system is designed by inserting an additional channel in the middle of two neighboring channels, and then frequency shift filter (FSF) is introduced for channel separation and signals extraction. As a result, this system's capacity can increase several-times [1][2][3][4][5][6][7]. Studies on large narrowband interference suppression can be seen in other literatures [8][9][10][11][12][13][14][15], which apply the cyclostationary property of signals in wireless communi-cation systems with narrowband interference.…”

Section: Introductionmentioning

confidence: 99%

Separating cyclostationary signals from spectrally overlapping interference

Liu

Guo

et al. 2006

Front. Electr. Electron. Eng. China

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This paper studies an algorithm about separating spectrally overlapping signals using the cyclostationary properties of signals. On the basis of direct sequence spread system (DSSS), frequency shift filter is added into the receiver of the communication system. Although the structure of frequency shift filter is more complicated than the time-domain filter, it uses both time correlations and frequency spectrum correlations so it can achieve better performances on separating the overlapping signals. After the analysis of cyclostationary characteristic and frequency spectrum correlation, the structure of the frequency shift filter can be gained. Then, a self-adaptive algorithm is utilized for the purpose of achieving optimum multidimensional tap weights of frequency shift components. The simulation results indicate that this method can efficiently separate overlapping signals, and its error rate is lower than the time-domain filter or DSSS system by two orders of magnitude on the condition that high-power interference is added into the system.

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On the use of a suppression filter for CDMA overlay

Cited by 31 publications

References 31 publications

Narrowband Interference Cancellation in DS-CDMA System Using a Suppression Filter

Narrowband Interference Cancellation in DS-CDMA System Using a Suppression Filter

Effect of Diversity and Filtering on the Performance of Wavelet Packets Base Multicarrier Multicode CDMA System

Separating cyclostationary signals from spectrally overlapping interference

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