Interference suppression for DS/CDMA

Singh, Rhishi Pratap; Milstein, L.B.

doi:10.1109/26.752825

Cited by 38 publications

(21 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, it has been widely reported that typically 2 or 3 stages of cancellation is adequate to achieve performance close to the best possible performance, and that increasing the number of stages beyond improves the performance only marginally, while increasing the complexity and delay [ 18]. Accordingly, we next analyze the performance of only the 3rd stage which takes .the 2nd stage soft outputs, Z <k 2 l (i) in ,m ( 16), as its input.…”

Section: Z~(i)mentioning

confidence: 99%

“…The statistics of the interference and noise terms at the 2nd stage output is of interest. Equation (16) can be written as (21) where…”

Section: Z~(i)mentioning

confidence: 99%

“…Adaptive implementations of lin detectors (training based as well as blind) requiring 1 prior knowledge of the interfering signal waveforms · also been widely studied [14][15][16][17]. Nonlinear suboptirr multiuser detectors, including successive interfere canceller (SIC) and parallel interference canceller (f~ [8,18], make tentative decisions on the bits of the u using any detector.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Performance Analysis of Parallel Interference Cancellation in Multicarrier DS-CDMA Systems

Kumar¹,

Chockalingam²

2005

IETE Journal of Research

View full text Add to dashboard Cite

In this paper, we present and analyze the performance of a parallel interference cancellation (PIC) scheme for multicarrier (MC) direct-sequence code-division multiple-access (OS-COMA) systems. At each cancellation stage in the proposed PIC scheme, on each subcarrier, a weighted sum of the soft outputs of the other users in the current stage is cancelled from the soft output of the desired user (rather than making hard bit decisions of the other users and regenerating and canceling the interfering signals) to form the input to the next stage. At the last stage, the interference cancelled outputs from all the subcarriers are maximal ratio combined (MRC) to form the decision statistic. The scheme has the advantage of not requiring the amplitude estimates of the other users. We derive analytical expressions for the bit error rate (BER) at different stages in the proposed PIC scheme on Rayleigh fading channels. Analytical results are found to agree well with the simulation results. The results show that the proposed PIC scheme offers better interference suppression capability than the conventional matched filter (MF) receiver. We also obtain bounds on the coded BER of the proposed PIC scheme for a convolutionally coded multicarrier OS-COMA system where the PIC-MRC output feeds a soft decision Viterbi decoder.

show abstract

Section: Z~(i)mentioning

confidence: 99%

“…The statistics of the interference and noise terms at the 2nd stage output is of interest. Equation (16) can be written as (21) where…”

Section: Z~(i)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Performance Analysis of Parallel Interference Cancellation in Multicarrier DS-CDMA Systems

Kumar¹,

Chockalingam²

2005

IETE Journal of Research

View full text Add to dashboard Cite

show abstract

“…In addition, these techniques also require subspace estimation, eigen decomposition, and inversion computation of the covariance matrix, which leads to high computational complexity, and are thereby limited to the applications where fast DOA estimation is not required [13,14]. Furthermore, in the presence of interference, these techniques need to estimate the DOAs of all the target signals and interference, which also increases computational complexity and decreases the accuracy of DOA estimation [15].…”

Section: Introductionmentioning

confidence: 99%

DOA estimation based on data level Multistage Nested Wiener Filter

Zhu

Tang

2015

J Wireless Com Network

View full text Add to dashboard Cite

A novel direction of arrival (DOA) estimation method based on data level Multistage Nested Wiener Filters (MSNWF) which is used to adaptive beamforming for subarray signal is proposed in this paper. The subarrays using the same array geometry are used to form a signal whose phase relative to the reference signal is a function of the DOA. The DOA is estimated by computing the phase shift between the reference signal and its phase-shifted version. The performance of this DOA estimation method is significantly improved due to the application of MSNWF for rejecting interference signals. The computation of the proposed method is simple, and the number of detectable signal sources can exceed the number of antenna elements.

show abstract

“…Moreover, because of the satellite signal Doppler frequency shift effect, it needs to overcome the filtering impact by Doppler frequency offset. For resolving the two problems, the PD(Partial Dispreading) method [5] is introduced. Figure 2 gives the Schematic of MIRR method based on partial dispreading.…”

Section: Introductionmentioning

confidence: 99%

Spoofing interference suppression using space-time process for GNSS receiver

Guo

Fan

Kong

2012

2012 5th International Congress on Image and Signal Processing

View full text Add to dashboard Cite

Spoofing interference suppression technique for GNSS receiver was deeply discussed. Space-time process and MMSE criterion were applied to anti-spoofing. The combination of PD(Partial Dispreading) and MIRR (Multistage Iterative Rankreduced) method was proposed to simplify the processing. The proposed method can suppress spoofing interference and significantly reduce the complexity of space-time process. Meanwhile, it also can overcome the effects of Doppler shift and improve the steady-state and transient performance of the filter. Numerical simulation demonstrates that the proposed method is effect and efficient.

show abstract

Interference suppression for DS/CDMA

Cited by 38 publications

References 13 publications

Performance Analysis of Parallel Interference Cancellation in Multicarrier DS-CDMA Systems

Performance Analysis of Parallel Interference Cancellation in Multicarrier DS-CDMA Systems

DOA estimation based on data level Multistage Nested Wiener Filter

Spoofing interference suppression using space-time process for GNSS receiver

Contact Info

Product

Resources

About