Code-aided interference suppression for DS/CDMA overlay systems

Buzzi, Stefano; Lops, Marco; Poor, H. Vincent

doi:10.1109/5.993406

Cited by 54 publications

(31 citation statements)

References 204 publications

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“…[6] and reviewed in Ref. [7]. Code-aided technique is based on the linear minimum mean-square error (MMSE) algorithm for multiuser detection.…”

Section: Introductionmentioning

confidence: 99%

“…When the spreading gain does not provide sufficient improvement due to bandwidth restriction (for example, the spreading gain of 802.11 is 11), the NBI rejection capability of a DSSS system can be further improved by using interference rejection filters prior to signal despreading [1][2][3][4][5][6][7] . Milstein reviewed the early NBI suppression techniques based on linear predictors or interpolators in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Code-aided interference suppression in direct sequence spread spectrum systems with eigenvector sign spreading code

Wang

Ying

Yang

2009

J. Shanghai Jiaotong Univ. (Sci.)

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For direct sequence spread spectrum (DSSS) communication systems suffering interference, it is known that code-aided interference suppression technique outperforms all of the previous linear or nonlinear methods. In this paper, we proposed an improved code-aided technique which can improve the system performance greatly by using the eigenvector sign (EVS) spreading sequence which depends on the statistical characteristics of the interference and the thermal noise.

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“…[6] and reviewed in Ref. [7]. Code-aided technique is based on the linear minimum mean-square error (MMSE) algorithm for multiuser detection.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Code-aided interference suppression in direct sequence spread spectrum systems with eigenvector sign spreading code

Wang

Ying

Yang

2009

J. Shanghai Jiaotong Univ. (Sci.)

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“…The preceding linear and nonlinear methods are primarily predictive methods that exploit the inherent predictability of narrowband interference. Further improvements in interference suppression are theoretically possible by using code-aided methods, which exploit the predictability of the spread-spectrum signal itself [31]. Most of these methods are based on methods that were originally developed for multiuser detection (Section 11).…”

Section: Adaptive Acm Filtermentioning

confidence: 99%

Direct-Sequence Communication Systems

Torrieri¹

2004

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Approved for public release; distribution unlimited. ii REPORT DOCUMENTATION PAGEForm Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) March 2004 REPORT TYPE ARL-TR-3175 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)U.S. Army Research Laboratory 2800 Powder Mill Road Adelphi, MD 20783-1197 SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report presents a comprehensive review of the state of the art of direct-sequence communication systems. Although it is largely self-contained mathematically, the report presumes a thorough understanding of modern digital communications. To limit the report to approximately 200 pages, only the most vital aspects of the theory are emphasized, but the cited references provide many details and minor topics. SUBJECT TERMS PrefaceThis report presents a comprehensive review of the state of the art of direct-sequence communication systems. Although it is largely self-contained mathematically, the report presumes a thorough understanding of modern digital communications. To limit the report to approximately 200 pages, only the most vital aspects of the theory are emphasized, but the cited references provide many details and minor topics. Sections 1 and 2 cover the basic definitions and concepts and the fundamental properties of spreading sequences. Sections 3 and 4 derive the symbol error probabilities of coherent systems in the presence of tone or Gaussian interference. Methods of suppressing pulsed interference are analyzed in Section 5. In Section 6, the role of matched filters in direct-sequence systems is examined. Code synchronization, which is the most significant issue in the design of direct-sequence systems, is analyzed in Section 7. Several supplementary methods of rejecting narrowband interference are presented in Section 8. The detection of the existence of a direct-sequence signal by both an ideal receiver and the more practical wideband radiometer are analyzed in Section 9. Section 10 explains and develops the theory of direct-sequence code-division multi...

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“…In general, the interference suppression technologies can be classified into three schemes: time domain scheme, frequency domain scheme [1] and code-aided interference suppression scheme [2]. Wherein, the FDAJ algorithms with good application prospects, transform the complex filtering process in time domain into simple threshold comparison in frequency domain.…”

Section: Introductionmentioning

confidence: 99%

A novel iterative threshold for anti-jamming algorithm and its implementation on FPGA

Yao

et al. 2014

16th International Conference on Advanced Communication Technology

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Abstract-Frequency-domain anti-jamming (FDAJ) algorithms achieve prominent performance on interference suppression with simple calculations; and hence they are widely used in many applications. The interference suppression threshold plays a key role in the algorithm and affects system performance greatly. In this paper, the initial interference threshold is derived theoretically and then a novel FDAJ algorithm is proposed based on the iterative calculation of the threshold. With the iterative process, the optimal threshold for the interference suppression can be approached with little loss of valid signals; and the antijamming performance can be further improved. The simulation results validate well that our proposed iterative algorithm has superior performance for interference suppression. Finally, two FPGA-based implementations are presented: pipeline scheme and iterative scheme. After analysing the different characteristics of each implementation, we discuss the suitable applications for these schemes.

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Code-aided interference suppression for DS/CDMA overlay systems

Cited by 54 publications

References 204 publications

Code-aided interference suppression in direct sequence spread spectrum systems with eigenvector sign spreading code

Code-aided interference suppression in direct sequence spread spectrum systems with eigenvector sign spreading code

Direct-Sequence Communication Systems

A novel iterative threshold for anti-jamming algorithm and its implementation on FPGA

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