CN101414850A - Method for generating and receiving multi-scale dual-quadrature straight-extend frequency-hopping mixing signal - Google Patents

Abstract

A method for producing and receiving multi-level biorthogonal direct-sequence and frequency hopping (DS/FH) mixed signals relates to a method for producing and receiving DS/FH mixed signals, aiming at solving the problem that the transmission speed of the existing mixed DS/FH signals has more limitation of bandwidth. Serial-parallel conversion of information data is carried out at the transmitting terminal, and multi-level biorthogonal keying modulation of the produced parallel data is carried out; the signals after modulation have stronger anti-interference ability and multi-access ability by frequency hopping processing and then are transmitted by an antenna; the received signals are firstly dehopped and demodulated at the receiving terminal and then corresponding processing is carried out by a local biorthogonal code and the demodulated received signals; the transmitted biorthogonal code is judged by calculating correlation values and positive and negative relation thereof, and then original data is recovered by the serial-parallel conversion. The method can improve the data transmission speed without changing occupied bandwidth of system so that the system can simultaneously support more users.

Description

A kind of generation of multi-scale dual-quadrature straight-extend frequency-hopping mixing signal and method of reseptance

Technical field

The present invention relates to a kind of generation and method of reseptance of straight expansion frequency-hopping mixing signal, belong to the spread spectrum field in the radio communication.

Background technology

Because the spread spectrum communication mode of hybrid driect-extension frequency hopping not only has direct sequence spread spectrum communication mode anti-multipath interference capability, and has the ability of the anti-narrow band interference of frequency hopping communications mode, near-far interference, therefore be subjected to people in recent years and more and more pay close attention to.But the acquisition of spread spectrum communication antijamming capability is cost with the extended signal bandwidth, in the environment of limited bandwidth, because the bandwidth of broad can not be provided, thereby limited the raising of the rate of information throughput.How under certain bandwidth condition, improving user data transmission speed to adapt to the development of high data rate and multimedia service, is the target that people pursue.

Summary of the invention

The present invention provides a kind of generation and method of reseptance of multi-scale dual-quadrature straight-extend frequency-hopping mixing signal for the transmission rate that solves existing hybrid driect-extension Frequency Hopping Signal is subjected to the bigger problem of bandwidth constraints.The present invention includes following steps:

Emission process:

Step 1, binary digital information is obtained a code element by string and conversion;

Step 2, code element is obtained the many bi-orthogonal sequences C that transmitting terminal produces by many bi-orthogonal sequences mapping _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1);

Step 3, produce transmitting terminal jump frequency signal according to the transmitting terminal frequency hop sequences;

Step 4, the many bi-orthogonal sequences C that transmitting terminal is produced _iAfter modulation, produce with transmitting terminal jump frequency signal mixing again and transmit emission after the process that transmits is amplified;

Receiving course:

Step 5, received signal is carried out bandpass filtering obtain the filtering received signal;

Step 6, according to the frequency hop sequences consistent that receiving terminal produces with transmitting terminal, produce receiving terminal jump frequency signal;

Step 7, receiving terminal jump frequency signal and filtering received signal are finished the jumping of separating to receiving terminal jump frequency signal by mixing;

Step 8, the receiving terminal jump frequency signal that will separate jumping carry out filtering, obtain the many bi-orthogonal sequences C that receiving terminal receives by demodulation again _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1);

Step 9, with the local many bi-orthogonal sequences C that produces of receiving terminal _jThe many bi-orthogonal sequences C that receives with receiving terminal respectively _iRelevant, j=1 wherein ..., 2 ^K-1, C _j∈ (0,1), and each correlation adjudicated behind the integration respectively will rule out the signal that obtains peak value at last, and to judge the many bi-orthogonal sequences that receiving terminal receives according to the polarity of peak value be C _iOr C _-i

Step 10, the many bi-orthogonal sequences C that the receiving terminal that rules out is received _iBe mapped to code element, pass through again and string conversion acquisition binary digital information.

Beneficial effect: the present invention adopts the mixed spread spectrum communication system of multi-system biorthogonal keying modulation, not only has direct sequence spread spectrum communication mode anti-multipath interference capability, ability with the anti-narrow band interference of frequency hopping communications mode, near-far interference, and by adopting multi-system biorthogonal keying modulation technique under the situation that does not change system's occupied bandwidth, to improve message transmission rate; The present invention adds the modulation of M-ary orthogonal keying by on the basis of original straight expansion frequency hopping hybrid spread spectrum communication means, can not change the spreading code character rate, does not promptly increase the message transmission rate of increase system on the basis of system bandwidth; And the different biorthogonal code character of different user use, can make the code character of different user well be discerned and distinguish by cross correlation good between code character, on the basis of Frequency Hopping Multiple Access FHMA, make system obtain the ability of code division multiple access; Under the situation that the user that the frequency hopping communications mode can be supported reaches capacity, system can be by distributing different biorthogonal code characters to improve user capacity for different user, and adopt bi-orthogonal codes that the quantity of the required orthogonal code of single user's code character is compared with common M-ary orthogonal coding mode and reduce half, just, on the basis of same quantity orthogonal code, can support to be equivalent to the user of original multi-system communication system 200% by adopting the biorthogonal mode.

Description of drawings

Fig. 1 is the hybrid direct sequence of employing multi-system biorthogonal keying modulation and the transmitter architecture schematic diagram of frequency-hopping spread spectrum signal; Fig. 2 is the hybrid direct sequence of employing multi-system biorthogonal keying modulation and the receiver structure schematic diagram of frequency-hopping spread spectrum signal.

Embodiment

Embodiment: referring to Fig. 1 and Fig. 2, present embodiment is made up of following steps:

Emission process:

Step 1, the k bit-binary numeral information that information source 1 is exported convert a code element to by deserializer 2, and wherein k represents natural number;

Step 2, code element is mapped to the many bi-orthogonal sequences C that transmitting terminal produces by transmitting terminal many bi-orthogonal sequences mapper 3 _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1);

Step 3, according to the frequency hop sequences that transmitting terminal frequency hop sequences maker 5 produces, transmitting terminal frequency synthesizer 4 produces transmitting terminal jump frequency signals;

The many bi-orthogonal sequences C that step 4, transmitting terminal produce _iBy after modulator 6 modulation, transmit by transmitting terminal frequency mixer 7 mixing generation with transmitting terminal jump frequency signal more earlier, transmit and after amplifier 8 amplifies, launch by the transmitting terminal antenna;

Receiving course:

Step 5, band pass filter 9 carry out bandpass filtering to received signal and obtain the filtering received signal;

Step 6, according to the frequency hop sequences identical that receiving terminal frequency hop sequences maker 11 produces with the transmitting terminal frequency hop sequences, receiving terminal frequency synthesizer 10 produces receiving terminal jump frequency signals,

Step 7, receiving terminal jump frequency signal and filtering received signal are finished the jumping of separating to receiving terminal jump frequency signal by 12 mixing of receiving terminal frequency mixer;

Step 8, will separate jumping receiving terminal jump frequency signal by intermediate-frequency filter 13 filtering, obtain the many bi-orthogonal sequences C that receiving terminal receives by demodulator 14 demodulation again _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1);

Step 9, with the local many bi-orthogonal sequences C that produce of receiving terminal bi-orthogonal codes mapper 15 _jThe many bi-orthogonal sequences C that receives with receiving terminal respectively _iRelevant, j=1 wherein ..., 2 ^K-1, C _j∈ (0,1), and with each correlation respectively by behind integrator 17 integrations by decision device 18 judgements, it is C that the signal that will rule out correlator 16 outputs that obtain peak value is at last judged the many bi-orthogonal sequences that receiving terminal receives according to the polarity of peak value _iOr C _-i

The many bi-orthogonal sequences C that step 10, bit decision device 19 receive receiving terminal _iBe mapped to code element, by obtaining k bit-binary numeral information after parallel-to-serial converter 20 conversions.

The basic thought of present embodiment is at transmitting terminal information data to be carried out serial to parallel conversion, the modulation of multi-system biorthogonal keying is carried out in the parallel data combination (code element) that produces, make the corresponding different bi-orthogonal codes of different code elements, the signal that modulation is finished is handled through frequency hopping and is made it have stronger antijamming capability and multiple access ability then, is launched by antenna again; At receiving terminal, separate at first to received signal and jump and demodulation, carry out relevant treatment by the bi-orthogonal codes and the received signal after the demodulation of this locality again, which bi-orthogonal codes by what calculate correlation and judge emission according to correlation positive and negative is, just can determine that source data is that a kind of code element, recover former data by also going here and there to change again.

The modulation of multi-system biorthogonal keying is also referred to as M unit's biorthogonal keying (M-ary Bi-OrthogonalKeying) modulation, represents a plurality of bit informations with a frequency expansion sequence, can obtain variable message transmission rate under fixing character rate.Concrete modulated process is:

The k bit information is through string and be converted into a code element, the corresponding many bi-orthogonal sequences C of code element _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1), k bit information common property is given birth to M (M=2 ^k) individual code element, a corresponding M many bi-orthogonal sequences, many bi-orthogonal sequences C _iSatisfy following formula:

$\underset{j=0}{\overset{L-1}{\mathrm{\Σ}}}{c}_{i_1,j}{c}_{i_2,j}=\left\{\begin{array}{cc}\mathrm{\ϵ}& i_1=i_2\\ -\mathrm{\ϵ}& i_1=-i_2\\ 0,& \left|i_1\right|\≠\left|i_2\right|\end{array}\right.$

Wherein e is C _iIn the number of non-vanishing element, L is C _iThe number of middle element.

At receiving terminal, only need just can realize despreading promptly relevant with received signal with many bi-orthogonal sequences, which correlator elder generation adjudicates and obtained peak value, judges the positive negativity of receiving terminal many bi-orthogonal sequences according to the polarity of peak value with half many bi-orthogonal sequences of original quantity.

Inter-area traffic interarea is gone here and there according to the mode of 1:4 and change, promptly each code element is made up of 4 Bit datas, and 4 Bit datas have 2 ⁴=16 kinds of combinations.Bi-orthogonal codes can be selected for use and revise the walsh sign indicating number, select 8 sign indicating numbers as local bi-orthogonal codes, are numbered C ₁To C ₈,, obtain C with this 8 sign indicating numbers negate respectively _-1To C _-8, then be numbered C ₁To C ₈And C _-1To C _-816 sign indicating numbers constitute required biorthogonal code characters, 16 kinds of code elements that corresponding 4 Bit datas produce.Because the orthogonality of walsh intersymbol, so different user can make system obtain the multiple access ability by selecting different walsh code characters for use.

Code character corresponding relation according to default becomes corresponding many bi-orthogonal sequences with the current information symbol mapped, supposes to be mapped as C ₂, modulator will be according to the modulation system (for example BPSK) of need usefulness with C ₂Be modulated on the carrier wave.Signal to modulator output carries out frequency hopping then.The frequency hop sequences maker produces pseudo noise code (for example m sequence), and pseudo noise code is the output frequency of control frequency synthesizer discretely, makes the frequency saltus step with the variation of pseudo noise code that transmits.The signal of modulator output carries out mixing with the jump frequency signal that frequency synthesizer is exported, and the output signal frequency that makes frequency mixer carries out saltus step with the instantaneous value of pseudo noise code, has realized frequency hopping function.Different pseudo noise codes can make the instantaneous frequency of frequency synthesizer carry out saltus step by different order, promptly carries out saltus step according to different frequency hopping patterns, and different user uses different frequency hopping patterns to make frequency-hopping system have the multiple access ability.

The signal that the process frequency hopping is handled is exaggerated device to carry out being sent by antenna after the power amplification.At receiving terminal, received signal is separated to jump again and is handled at first by band pass filter filtering out-of-band noise.The FH Sequence Generator of receiving terminal produces consistent with transmitting terminal, send same pseudo random sequence, then frequency synthesizer can be exported the frequency signal with transmitting terminal saltus step sequence consensus, and this signal and received signal are carried out mixing, can separate jumping to received signal.Separate signal after the jumping and carry out demodulation after by intermediate-frequency filter, demodulator will be exported bi-orthogonal codes C ₂

Bi-orthogonal codes C then ₂Will with local 8 the bi-orthogonal codes C that preserve of receiving terminal ₁To C ₈Be correlated with by 8 correlators respectively, correlated results carries out integral operation by integrator.Because the orthogonality between bi-orthogonal codes has only C ₂Corresponding correlator and integrator have peak value output, and other integrators are output as zero.Decision device is according to C ₂Corresponding integrator has peak value output, judges that the many bi-orthogonal sequences of sending is C ₂Or C _-2, again according to the peak value polarity of output for just, judgement is C ₂, if peak value polarity then is judged as C for negative _-2The bit decision device rules out information code element according to the default many bi-orthogonal sequences and the corresponding relation of information code element subsequently, and information code element is again through also recovering former 4 Bit datas after the string conversion.

Claims (1)

1, a kind of generation of multi-scale dual-quadrature straight-extend frequency-hopping mixing signal and method of reseptance is characterized in that it may further comprise the steps:

Emission process:

Step 1, binary digital information is obtained a code element by string and conversion;

Step 2, code element is obtained the many bi-orthogonal sequences C that transmitting terminal produces by many bi-orthogonal sequences mapping _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1);

Step 3, produce transmitting terminal jump frequency signal according to the transmitting terminal frequency hop sequences;

Step 4, the many bi-orthogonal sequences C that transmitting terminal is produced _iAfter modulation, produce with transmitting terminal jump frequency signal mixing again and transmit emission after the process that transmits is amplified;

Receiving course:

Step 5, received signal is carried out bandpass filtering obtain the filtering received signal;

Step 6, according to the frequency hop sequences consistent that receiving terminal produces with transmitting terminal, produce receiving terminal jump frequency signal;

Step 7, receiving terminal jump frequency signal and filtering received signal are finished the jumping of separating to receiving terminal jump frequency signal by mixing;

Step 8, the receiving terminal jump frequency signal that will separate jumping carry out filtering, obtain the many bi-orthogonal sequences C that receiving terminal receives by demodulation again _i, i=-2 wherein ^K-1,-1,1,2 ^K-1, C _i∈ (1,0,1);

Step 9, with the local many bi-orthogonal sequences C that produces of receiving terminal _jThe many bi-orthogonal sequences C that receives with receiving terminal respectively _iRelevant, j=1 wherein ..., 2 ^K-1, C _j∈ (0,1), and each correlation adjudicated behind the integration respectively will rule out the signal that obtains peak value at last, and to judge the many bi-orthogonal sequences that receiving terminal receives according to the polarity of peak value be C _iOr C _-i

Step 10, the many bi-orthogonal sequences C that the receiving terminal that rules out is received _iBe mapped to code element, pass through again and string conversion acquisition binary digital information.

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