CN109495416B - Grouping index OFDM communication method based on combination of message and random sequence - Google Patents

Grouping index OFDM communication method based on combination of message and random sequence Download PDF

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CN109495416B
CN109495416B CN201811419870.7A CN201811419870A CN109495416B CN 109495416 B CN109495416 B CN 109495416B CN 201811419870 A CN201811419870 A CN 201811419870A CN 109495416 B CN109495416 B CN 109495416B
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孙志国
严盼
宁晓燕
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Harbin Engineering University
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    • H04L27/00—Modulated-carrier systems
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    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract

The invention belongs to the technical field of wireless communication, and particularly relates to a grouping index OFDM communication method based on combination of a message and a random sequence. The principle of the grouped SIM-OFDM communication technology based on the combination of the random sequence and the message is that partial subcarriers of each carrier block in each OFDM symbol are activated to transmit modulation symbols by using a mode of combining message driving and random sequence driving, other subcarriers keep a silent state, and the grouped index OFDM communication technology based on the combination of the message and the random sequence utilizes the randomness of a PN sequence to cause the relationship between index bits and activated carrier distribution to be changed randomly, so that the index bit information is more concealed. Under the mode of PN sequence and index bit combined drive, the frequency spectrum efficiency of the system is not sacrificed, and the anti-interception performance of the system is greatly improved under the condition of not reducing the anti-interference performance.

Description

Grouping index OFDM communication method based on combination of message and random sequence
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to a grouping index OFDM communication method based on combination of a message and a random sequence.
Background
Compared with the traditional OFDM, the SIM-OFDM technology can enlarge the distance between frequency domain sending signals due to the scarcity of activated subcarriers, reduces the sensitivity of the system to frequency offset, has lower peak-to-average ratio, and can make up for the loss of spectral efficiency caused by the silence of partial subcarriers by introducing index bit information. However, the prior art has the disadvantages that the index information bit controls the selection of the activated part of subcarriers in each group of subcarriers to transmit the constellation point symbols, other subcarriers are set to be 0, and because a certain direct rule exists between the distribution of the index bits and the activated subcarriers, the rule is single, lacks randomness and is easy to crack. In the communication process, if a communication adversary correctly detects the position of the activated carrier and simultaneously cracks the distribution rule of the index bits and the activated carrier, the information of the index bits is lost, so that the interception resistance of the SIM-OFDM system is poor. In the present military and civil communications, there is a great demand for anti-interception, so it is necessary to improve the anti-interception performance based on the prior art.
Disclosure of Invention
Aiming at the problem of poor anti-interception performance of the existing SIM-OFDM communication technology, the invention provides a packet index OFDM communication technology based on the combination of a message and a random sequence, which improves the anti-interception performance of a system without reducing the anti-interference performance and the spectrum efficiency of the system.
A method for packet-indexed OFDM communication based on the association of a message with a random sequence, the method comprising the steps of:
step 1: determining parameters of a system, framing by a digital information source, calculating the number of message bits and the number of modulation bits, wherein the index bits are used for generating joint index bits by XOR with PN sequence bits, and the information modulation bits generate M-order modulation symbols;
step 2: selecting different subcarrier activation combinations according to the determined system parameters and different joint index bits;
and step 3: according to the selected subcarrier activation combination, subcarrier index mapping and modulation are carried out, serial-parallel conversion is carried out, N-point IFFT operation is carried out, and CP is added;
and 4, step 4: according to the information source information sent after the steps 1 to 3, the information source information reaches a receiving end through a channel;
and 5: according to the signal received by the receiving end, removing CP from the signal, performing N-point FFT operation, and performing parallel-serial conversion;
step 6: and (5) according to the signal obtained after the processing in the step (5), carrying out signal detection and index inverse mapping, and outputting a bit.
The system parameters in step 1 include total number N of subcarriers, grouping number G of subcarriers, number I of subcarriers in each group, number k of activated subcarriers in each group, modulation order M, framing by digital information source, each frame having (p)1+p2) G bits of information, where the number of message bits p1Calculated from the following formula:
Figure BDA0001880319130000021
number of modulation bits p2From belowCalculating the formula:
p2＝klog2M
the rule of XOR of the index bits and the PN sequence is: different index bits in all subcarrier blocks in each OFDM symbol are subjected to XOR with the same PN sequence bit to obtain different joint index bits; the index bits in different OFDM symbols are xored with different PN sequence bits, i.e., the randomness of the PN sequence is present between different OFDM symbols.
The selecting different subcarrier activation combinations according to different joint index bits in step 2 specifically includes: for a system with the total number of N subcarriers, the number of subcarriers in each subcarrier block is I-N/G, k subcarriers are selected from the I subcarriers to be activated, and the number of index message bits in each block is p1Then exist
Figure BDA0001880319130000029
Activating combination of sub-carriers, wherein the combination set of the g sub-block is
Figure BDA0001880319130000022
The index information bit of the g group in the ith frame index OFDM information bit is expressed as
Figure BDA0001880319130000023
The PN sequence of the system is:
Figure BDA0001880319130000024
wherein the content of the first and second substances,
Figure BDA0001880319130000025
and indexing PN sequence bits corresponding to OFDM information for the ith frame, wherein the joint index bits of each group are as follows:
Figure BDA0001880319130000026
wherein the joint index bit vi,gCorresponding decimal number ofo, the active combination of the sub-carriers corresponding to the sub-carrier block is:
Figure BDA0001880319130000027
wherein, betag,rE {0,1}, G1, 2, …, G, r 1,2, …, I, and
Figure BDA0001880319130000028
k values are 1, and I-k values are 0; when beta isg,rWhen the number of the subcarriers is 1, the subcarrier with the number r in the g-th subcarrier block is in an active state, and when the number of the subcarriers is betag,rWhen it is equal to 0, it indicates that the subcarrier numbered r in the g-th subcarrier block is in a silent state.
The invention has the beneficial effects that:
the grouping index OFDM communication technology based on the combination of the message and the random sequence utilizes the randomness of a PN sequence to cause that the relation between the index bit and the distribution of the activated carriers also changes in a random way, so that the index bit information is more concealed. Under the mode of PN sequence and index bit combined drive, the frequency spectrum efficiency of the system is not sacrificed, and the anti-interception performance of the system is greatly improved under the condition of not reducing the anti-interference performance.
Drawings
Fig. 1 is a link diagram of a packet-indexed OFDM communication system based on message association with a random sequence.
Fig. 2 is a diagram of a transmitting end structure of the SIM-OFDM communication system.
Fig. 3 is a diagram of a transmitting end structure of a packet-indexed OFDM communication system based on a message combined with a random sequence.
Fig. 4 is a process of generating joint index bits within the same subcarrier block in consecutive OFDM symbols.
Fig. 5 is an example of a relationship between index bits, PN sequence bits, joint index bits, and distribution of active subcarriers in an OFDM communication system based on packet index of a message combined with a random sequence, for example, I-4, k-1.
Fig. 6 is a graph comparing the bit error rate of the packet-indexed OFDM system and the SIM-OFDM system based on the combination of the message and the random sequence in the gaussian channel.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. A packet index OFDM communication technology based on random sequence and message combination belongs to the technical field of wireless communication. The principle of the grouped SIM-OFDM communication technology based on the combination of the random sequence and the message is that partial subcarriers of each carrier block in each OFDM symbol are activated to transmit modulation symbols by using a mode of combining message driving and random sequence driving, other subcarriers keep a silent state, and the randomness of a PN sequence is utilized to cause the relationship between index bits and activated carrier distribution to be changed randomly, so that the index bit information is more concealed. The invention realizes the activation of the sub-carrier by using the index modulation technology combining random sequence drive and message drive, and compared with the grouping index OFDM (SIM-OFDM) communication technology, the invention has higher randomness and better anti-interception performance without reducing the anti-interference performance and the spectrum efficiency.
Based on the grouping index OFDM communication technology of combining the message and the random sequence, partial subcarriers are activated by the indexing mode of combining the message driving and the random sequence driving. The method comprises the following steps:
step 1: framing by a digitized source, each frame having (p)1+p2) G information bits, divided into G groups, each group comprising an index bit p1Bit sum modulation bit p2The bit, the index bit is used for generating a joint index bit by XOR with the PN sequence bit, and the information modulation bit generates an M-order modulation symbol;
step 2: PN sequence drive and message drive combined index technology, selecting different subcarrier activation combinations according to different combined index bits;
and step 3: mapping and modulating subcarrier indexes, performing serial-parallel conversion, performing N-point IFFT operation, and adding a CP (program control protocol);
and 4, step 4: the information source information is sent after the step 1-3 and reaches a receiving end through a channel;
and 5: removing the CP, performing N-point FFT operation, and performing parallel-serial conversion;
step 6: and the signal detection and the index are inversely mapped, and bits are output.
The xor rule of the index bit and the PN sequence in step 1 may be specifically expressed as:
different index bits in all subcarrier blocks in each OFDM symbol are subjected to XOR with the same PN sequence bit to obtain different joint index bits; the index bits in different OFDM symbols are xored with different PN sequence bits, i.e., the randomness of the PN sequence is present between different OFDM symbols.
The indexing technique for combining the PN sequence and the message in step 2 can be specifically expressed as:
for a system with N subcarriers, each subcarrier block has N/G subcarriers, k subcarriers are selected from the N subcarriers for activation, and the index bit number in each block is
Figure BDA0001880319130000041
Then there is
Figure BDA00018803191300000410
The sub-carriers activate the combination, and the combination set of the g sub-block can be expressed as
Figure BDA0001880319130000042
The index information bit of the g group in the ith frame index OFDM information bit is expressed as
Figure BDA0001880319130000043
The PN sequence of the system can be expressed as:
Figure BDA0001880319130000044
the PN sequence bit corresponding to the ith frame index OFDM information is
Figure BDA0001880319130000045
Wherein the groups of joint index bits may be represented as:
Figure BDA0001880319130000046
joint index bit vi,gThe corresponding decimal number is o, then the activated combination of the sub-carriers corresponding to the sub-carrier block is
Figure BDA0001880319130000047
Wherein G is 1,2, …, G, betag,rE {0,1}, r 1,2, …, I, and
Figure BDA0001880319130000048
k values of 1, I-k values of 0, beta g,r1 indicates that the subcarrier numbered r in the g-th subcarrier block is active, βg,r0 indicates that the subcarrier numbered r is in a silent state.
Fig. 2 is a frame diagram of a transmitting end of a SIM-OFDM communication system, such as the frame diagram of the transmitting end of the OFDM communication system based on grouping index of messages and random sequences shown in fig. 3, the transmitting end mainly includes the following steps:
step 1: parameters of the system are determined. The method comprises the total number N of subcarriers, the grouping number G of subcarriers, the number I of subcarriers in each group, the number k of activated subcarriers in each group and the modulation order M. Framing by a digitized source, each frame having (p)1+p2) G bit information bits according to the formula
Figure BDA0001880319130000049
And p2＝klog2M calculates the number of message bits and the number of modulation bits.
Step 2: PN sequence driving and message driving combined indexing technology selects different subcarrier activation combinations according to different combined index bits.
System presence
Figure BDA00018803191300000411
The sub-carriers activate the combination, and the combination set of the g sub-block can be expressed as
Figure BDA0001880319130000051
The index information bit of the g group in the ith frame index OFDM information bit is expressed as
Figure BDA0001880319130000052
The PN sequence of the system can be expressed as
Figure BDA0001880319130000053
The PN sequence bit corresponding to the ith frame index OFDM information is
Figure BDA0001880319130000054
Wherein the groups of joint index bits can be represented as
Figure BDA0001880319130000055
Joint index bit vi,gThe corresponding decimal number is o, then the activated combination of the sub-carriers corresponding to the sub-carrier block is
Figure BDA0001880319130000056
Wherein G is 1,2, …, G, betag,rE {0,1}, r 1,2, …, I, and
Figure BDA0001880319130000059
k values of 1, I-k values of 0, beta g,r1 indicates that the subcarrier numbered r in the g-th subcarrier block is active, βg,r0 indicates that the subcarrier numbered r is in a silent state.
Fig. 4 shows a generation process of joint index bits in the same sub-carrier block of consecutive OFDM symbols in a packet-indexed OFDM system based on message-to-random sequence joint, where I-4, k-1 is taken as an example, and the index bits in different OFDM symbols are xored with different PN sequence bits to generate joint index bits.
As shown in fig. 5, which is an example of a relationship between an index bit, a PN sequence bit, and a joint index bit, for example, I-4, k-1, and an active subcarrier distribution, a rule between the PN sequence bit and the active subcarrier distribution is the same as a rule between the index bit and the active subcarrier distribution in the SIM-OFDM system, but due to the randomness of the PN sequence, there is no rule between the index bit and the joint index bit, so that index bit information is encrypted by the randomness of the PN sequence, and the index bit of the system cannot be derived from the joint index bit.
P is to be2M-order modulation mapping is carried out on bit modulation bits to k constellation symbols sg＝{sg,1,sg,2,…,sg,kAnd after sub-carrier information mapping, the transmission signal of each sub-carrier block may be denoted as Xg＝[xg,1,xg,2,…,xg,I]TG is 1,2, …, G, wherein
Figure BDA0001880319130000057
Namely XgThere are k constellation point symbols mapped by modulation information bits.
The system transmission signal can be expressed as
Figure BDA0001880319130000058
And step 3: mapping and modulating the subcarrier index, carrying out serial-parallel conversion, carrying out N-point IFFT operation, and adding CP.
And 4, step 4: through the channel to the receiving end.
And 5: and removing the CP, performing N-point FFT operation, and performing parallel-serial conversion.
Step 6: and the signal detection and the index are inversely mapped, and bits are output.
And judging the activated subcarrier at a system receiving end by using an energy amplifier, determining a subcarrier activation combination, demodulating a joint index bit according to index inverse mapping, and deriving the index bit of the system according to PN sequence information of a transmitting end.
As shown in fig. 6, under the gaussian channel, the error rate performance of the present invention is substantially the same as that of the SIM-OFDM system, and the simulation parameters are I-4 and k-1, which proves that the interference resistance of the present invention is not inferior to that of the SIM-OFDM system.
The invention introduces PN sequence based on SIM-OFDM, under the condition of PN sequence and index bit combined drive, the anti-interception performance of the system is improved to a great extent without reducing the anti-interference performance and the spectrum efficiency of the system, which has application value in military and civil communication.
The technical scheme of the invention is as follows:
index modulation and random sequence combination are introduced at the transmitting end of the system, and partial subcarriers are activated to transmit modulation symbols in an index mode combining message driving and random sequence driving. Dividing an information source bit into two parts, wherein one part is used as a signal modulation bit and is mapped into an M-system constellation point symbol; one part of the index drive bit is used as an index drive bit, and the index drive bit is XOR-ed with a random sequence to obtain a joint index bit, so that the carrier activation is realized by using a mode of combining message drive and random sequence drive.
The overall system link of the present invention is shown in fig. 1 and includes digitized source, subcarrier index mapping and modulation, serial-to-parallel conversion, IFFT, channel, FFT, parallel-to-serial conversion, and signal detection and demodulation.
Based on the grouping index OFDM communication technology of combining the message and the random sequence, partial subcarriers are activated by the indexing mode of combining the message driving and the random sequence driving. The method is characterized by comprising the following steps:
step 1: framing by a digitized source, each frame having (p)1+p2) G information bits, divided into G groups, each group comprising an index bit p1Bit sum modulation bit p2And the index bit is used for generating a joint index bit by XOR with the PN sequence bit, and the information modulation bit generates an M-order modulation symbol.
Step 2: PN sequence driving and message driving combined indexing technology selects different subcarrier activation combinations according to different combined index bits.
And step 3: mapping and modulating the subcarrier index, carrying out serial-parallel conversion, carrying out N-point IFFT operation, and adding CP.
And 4, step 4: and (4) sending the information source information after the steps 1-3, and reaching a receiving end through a channel.
And 5: and removing the CP, performing N-point FFT operation, and performing parallel-serial conversion.
Step 6: and the signal detection and the index are inversely mapped, and bits are output.
The xor rule of the index bit and the PN sequence in step 1 may be specifically expressed as:
different index bits in all subcarrier blocks in each OFDM symbol are subjected to XOR with the same PN sequence bit to obtain different joint index bits; the index bits in different OFDM symbols are xored with different PN sequence bits, i.e., the randomness of the PN sequence is present between different OFDM symbols.
The indexing technique for combining the PN sequence and the message in step 2 can be specifically expressed as:
for a system with N subcarriers, each subcarrier block has N/G subcarriers, k subcarriers are selected from the N subcarriers for activation, and the index bit number in each block is
Figure BDA0001880319130000071
Then there is
Figure BDA00018803191300000710
The sub-carriers activate the combination, and the combination set of the g sub-block can be expressed as
Figure BDA0001880319130000072
The index information bit of the g group in the ith frame index OFDM information bit is expressed as
Figure BDA0001880319130000073
The PN sequence of the system can be expressed as
Figure BDA0001880319130000074
Frame iPN sequence bits corresponding to the OFDM information are introduced as
Figure BDA0001880319130000075
Wherein the groups of joint index bits can be represented as
Figure BDA0001880319130000076
Joint index bit vi,gThe corresponding decimal number is o, then the activated combination of the sub-carriers corresponding to the sub-carrier block is
Figure BDA0001880319130000077
Wherein G is 1,2, …, G, betag,rE {0,1}, r 1,2, …, I, and
Figure BDA0001880319130000078
k values of 1, I-k values of 0, beta g,r1 indicates that the subcarrier numbered r in the g-th subcarrier block is active, βg,r0 indicates that the subcarrier numbered r is in a silent state.
With k active subcarriers transmitting data modulation symbols, p, in each group2Bit information is modulated to generate M-order modulation symbols, then p2＝klog2M, the system of the invention has the spectral efficiency of
Figure BDA0001880319130000079
The spectrum efficiency is the same as that of the existing SIM-OFDM system.

Claims (3)

1. A method for packet-indexed OFDM communication based on the association of a message with a random sequence, the method comprising the steps of:
step 1: determining parameters of a system, framing by a digital information source, calculating the number of message bits and the number of modulation bits, wherein the index bits are used for generating joint index bits by XOR with PN sequence bits, and the information modulation bits generate M-order modulation symbols;
the rule of XOR of the index bits and the PN sequence is: different index bits in all subcarrier blocks in each OFDM symbol are subjected to XOR with the same PN sequence bit to obtain different joint index bits; the index bits in different OFDM symbols are exclusive-OR with different PN sequence bits, namely the random of PN sequence is embodied between different OFDM symbols;
step 2: selecting different subcarrier activation combinations according to the determined system parameters and different joint index bits;
and step 3: according to the selected subcarrier activation combination, subcarrier index mapping and modulation are carried out, serial-parallel conversion is carried out, N-point IFFT operation is carried out, and CP is added;
and 4, step 4: according to the information source information sent after the steps 1 to 3, the information source information reaches a receiving end through a channel;
and 5: according to the signal received by the receiving end, removing CP from the signal, performing N-point FFT operation, and performing parallel-serial conversion;
step 6: and (5) according to the signal obtained after the processing in the step (5), carrying out signal detection and index inverse mapping, and outputting a bit.
2. The method of claim 1, wherein the OFDM communication method comprises the steps of: the system parameters in step 1 include total number N of subcarriers, grouping number G of subcarriers, number I of subcarriers in each group, number k of activated subcarriers in each group, modulation order M, framing by digital information source, each frame having (p)1+p2) G bits of information, where the number of message bits p1Calculated from the following formula:
Figure FDA0002983238550000011
number of modulation bits p2Calculated from the following formula:
p2＝klog2M。
3. the method of claim 2, wherein the selecting different active combinations of subcarriers according to the determined system parameters and different joint index bits in step 2 specifically comprises: for a system with the total number of N subcarriers, the number of subcarriers in each subcarrier block is I-N/G, k subcarriers are selected from the I subcarriers to be activated, and the number of index message bits in each block is p1Then exist
Figure FDA0002983238550000012
Activating combination of sub-carriers, wherein the combination set of the g sub-block is
Figure FDA0002983238550000013
The index information bit of the g group in the ith frame index OFDM information bit is expressed as
Figure FDA0002983238550000014
The PN sequence of the system is:
Figure FDA0002983238550000015
wherein the content of the first and second substances,
Figure FDA0002983238550000021
and indexing PN sequence bits corresponding to OFDM information for the ith frame, wherein the joint index bits of each group are as follows:
Figure FDA0002983238550000022
wherein the joint index bit vi,gThe corresponding decimal number is o, then the activated combination of the sub-carriers corresponding to the sub-carrier block is:
Figure FDA0002983238550000023
wherein, betag,rE {0,1}, G1, 2, …, G, r 1,2, …, I, and
Figure FDA0002983238550000024
k values are 1, and I-k values are 0; when beta isg,rWhen the number of the subcarriers is 1, the subcarrier with the number r in the g-th subcarrier block is in an active state, and when the number of the subcarriers is betag,rWhen it is equal to 0, it indicates that the subcarrier numbered r in the g-th subcarrier block is in a silent state.
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