In this paper,a property of Frequency Hopping (FH) sequence set with No Hit Zone (NHZ) is analyzed. Based on matrix transform and mapping methods,respectively,two classes of NHZ FH sequences are presented. These NHZ F...In this paper,a property of Frequency Hopping (FH) sequence set with No Hit Zone (NHZ) is analyzed. Based on matrix transform and mapping methods,respectively,two classes of NHZ FH sequences are presented. These NHZ FH sequences have good Hamming auto-correlation and Hamming cross-correlation properties. FH Code-Division Multiple Access (FH-CDMA) communication systems employing such NHZ FH sequences will eliminate multiple-access interference if the maximum time delay is shorter than the length of the NHZ.展开更多
A novel family of frequency-hopping(FH)se-quences based on iterated block cipher is proposed for frequencyhopping multiple-access(FHMA)communica-tions.The design offers a class of nonlinear FH codes with high security...A novel family of frequency-hopping(FH)se-quences based on iterated block cipher is proposed for frequencyhopping multiple-access(FHMA)communica-tions.The design offers a class of nonlinear FH codes with high security,large linear span and a uniform spread over the entire frequency bandwidth.Moreover,FH sequences among the family are independent from each other and they perform as well as random patterns in terms of multi-ple access interference in anti-jamming applications.With the performance of packet error and throughput for FHMA network being derived in theory,many numerical results of the 3DES sequences are presented,comparing with those of shift register sequences and chaotic FH sequences.Effi-ciently implemented in field programmable gate arrays(FPGA),the generator prototype of the proposed sequence has been realized and incorporated into fast FH radio.展开更多
基金the National Natural Science Foundation of China (No.90604035 and 60572142)the Program for New Century Excellent Talents in University (NCET) (No.NECT-05-0795).
文摘In this paper,a property of Frequency Hopping (FH) sequence set with No Hit Zone (NHZ) is analyzed. Based on matrix transform and mapping methods,respectively,two classes of NHZ FH sequences are presented. These NHZ FH sequences have good Hamming auto-correlation and Hamming cross-correlation properties. FH Code-Division Multiple Access (FH-CDMA) communication systems employing such NHZ FH sequences will eliminate multiple-access interference if the maximum time delay is shorter than the length of the NHZ.
基金supported by the National Natural Science Foundation of China(No.60402040)Natural Sci-ence Foundation of Shaanxi Province(No.2005F29)the 10th Fok Ying Tong Education Foundation for Young Teacher(No.101065),China.
文摘A novel family of frequency-hopping(FH)se-quences based on iterated block cipher is proposed for frequencyhopping multiple-access(FHMA)communica-tions.The design offers a class of nonlinear FH codes with high security,large linear span and a uniform spread over the entire frequency bandwidth.Moreover,FH sequences among the family are independent from each other and they perform as well as random patterns in terms of multi-ple access interference in anti-jamming applications.With the performance of packet error and throughput for FHMA network being derived in theory,many numerical results of the 3DES sequences are presented,comparing with those of shift register sequences and chaotic FH sequences.Effi-ciently implemented in field programmable gate arrays(FPGA),the generator prototype of the proposed sequence has been realized and incorporated into fast FH radio.
