Theoretical Research On The Construction Of Frequency Hopping Sequence Sets In Multi-subset No Hit Zone

Frequency-hopping code division multiple access system has the characteristics of good anti-jamming,strong anti interception ability,good security,etc.It is widely used in military radio communication,mobile communication,modern radar and echolocation system.Frequency hopping sequence plays an important role in frequency hopping communication system.The performance of frequency hopping sequence directly affects the performance of frequency hopping communication system.In order to solve the interference problem of inter-cell communication system in multi-cell environment,this paper studies the method of no hit zone frequency hopping sequence sets with multisubsets.Firstly,based on the interleave theory,a method of multiple no hit zone frequency hopping sequence sets with good inter-set correlation is proposed.The sequence set obtained by this construction method contains several subsets,each of which is a set of frequency-hopping sequences in the no hit zone and has a good correlation with each other.The sequences in the set are unequally shifted and the length of the no hit zone can be selected flexibly under certain conditions.This method can reduce and eliminate the interference of inter-cell user communication.Secondly,based on the matrix arrangement,a method of no hit zone frequency hopping sequence sets with multi-subsets is proposed.The parameters of the sequence set obtained by this method satisfy the theoretical field and are the optimal frequency hopping sequence set in the no hit zone.This method is simple in structure and easy to implement.The length and number of sequences can be selected flexibly.By changing the parameters,we also construct non-repeating no hit zone frequency hopping sequence sets with multi-subsets,in which the sequences have the ideal hamming autocorrelation characteristics.This construction method provides a new solution to the problem of multi-cell communication interference.Finally,based on the non-repeating no hit zone frequency hopping sequence sets with multi-subsets,through the mixed operation,designed the better performance of no hit zone set frequency hopping sequence,the length of the sequence and no hit zone length is longer,set parameters meet the theoretical frequency hopping sequences,the optimal no hit zone for frequency hopping sequence set,set sequence has the ideal hamming autocorrelation characteristic.Compared with the original frequency hopping sequence set in the no hit zone,the length of the sequence and the length of the zero collision zone are longer and the performance is better.