Contractive mapping-based adaptive random frequency hopping sequence generation method
A technology of compression mapping and frequency hopping sequence, applied in the field of communication, can solve the problems of inaccuracy of channel quality assessment, large linear complexity of frequency hopping sequence randomness, inability to predict current and future frequencies, etc. Good real-time and self-adaptive, and the effect of improving accuracy
Active Publication Date: 2016-03-23
XIDIAN UNIV +1
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[0016] 6. The frequency hopping sequence should have good randomness and high linear complexity, so that the enemy cannot use the previously transmitted frequency information to predict the current and future frequencies
However, the above-mentioned various frequency hopping sequences cannot solve this problem in the random frequency hopping stage, which will lead to inaccurate channel quality assessment, thus causing unreliability of data transmission
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[0046] Step 1, define the original sequence H 0 .
[0047] To generate the final frequency hopping sequence, the original sequence needs to be given, and the original sequence is H 0 ={s 0 (j)},s 0 (j) represents each original symbol in the original sequence, set 0≤s o (j)≤rq, r is the compression factor, and q is the number of frequency slots of the system.
[0048] Step 2, define the weight w f .
[0049] Each original symbol s in the original sequence o All values of (j) are defined as the set F 0 , F 0 Each symbol in is called a mapping source, when for the set F 0 When performing compressed mapping, multiple mapping sources are used to correspond to a frequency hopping frequency number, and each frequency hopping number corresponds to the number of mapping sources with a weight w f Indicates that f represents the frequency hopping frequency number 0≤ff Instead of the occurrence probability of each frequency hopping number.
[0050] Step 3, determine the initial...
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The invention discloses a contractive mapping-based adaptive random frequency hopping sequence generation method. According to the technical schemes of the invention, the method includes the following steps that: an original sequence is defined, and the definition of a weight is deduced from the original sequence; at an initial stage, the weight is initialized; at a scanning frequency hopping stage, the weight is updated; at a random frequency hopping stage, the weight is updated again, so that a final weight can be obtained; cumulative distribution of the final weight is calculated; a contractive mapping relation is determined according to the cumulative distribution; and a final frequency hopping frequency number set is generated according to the contractive mapping relation. According to the contractive mapping-based adaptive random frequency hopping sequence generation method of the invention, frequency points suitable for data transmission are selected out in a communication process according to a probability, and at the same time, the probability can be updated adaptively according to the change of channel environment, and therefore, the transmission frequency points can converge onto an optimal frequency point, and reliable data transmission is realized; and the weight of which the value is an integer is adopted and is equivalent to the probability, and therefore, the implementation of practice application of the method can be facilitated. The method can be used for efficient data transmission in a frequency hopping system.
Description
technical field [0001] The invention belongs to the technical field of communication, and further relates to a frequency hopping sequence design method in a frequency hopping communication system, which can be used for efficient data transmission in the frequency hopping system. Background technique [0002] Spread spectrum communication, referred to as spread spectrum communication, is one of the ways of information transmission. The frequency bandwidth occupied by the signal is much larger than the minimum bandwidth required for the transmitted information; the expansion of the frequency band is completed through an independent sequence, using coding and The method of modulation is realized, which has nothing to do with the transmitted data. At the receiving end, the same code is used for related synchronous reception, despreading and recovery of the transmitted information. [0003] Frequency hopping is one of the most commonly used spread spectrum methods. Its working pr...
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IPC IPC(8): H04B1/7136
CPCH04B1/7136
Inventor 马卓郭彦涛杜白杜栓义史健康
Owner XIDIAN UNIV
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