CN203446034U - OFDM-based GSM voice encryption system - Google Patents
OFDM-based GSM voice encryption system Download PDFInfo
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- CN203446034U CN203446034U CN201320162194.6U CN201320162194U CN203446034U CN 203446034 U CN203446034 U CN 203446034U CN 201320162194 U CN201320162194 U CN 201320162194U CN 203446034 U CN203446034 U CN 203446034U
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Abstract
The utility model relates to an OFDM-based GSM voice encryption system. The OFDM-based GSM voice encryption system comprises a transmitting terminal module and a receiving terminal module which are respectively disposed in a transmitting terminal mobile phone and a receiving terminal mobile phone, wherein the transmitting terminal module includes an A/D conversion module, an AMBE compression module, an encryption module, an OFDM module, an RPE-LTP compression module and an interleaved coded modulator. The beneficial effects are that by using an OFDM module modulation transmission method to perform encryption processing on GSM voices, the OFDM-based GSM voice encryption system realizes simple, fast, safe and low-cost GSM voice communication; and the processing delay is small, the sound articulation is high and the confidentiality is high.
Description
Technical field
The utility model relates to voice encryption technical field, especially relates to a kind of GSM voice encryption system based on OFDM.
Background technology
The cellular mobile communication standard based on time division multiple access way that GSMShi International Telecommunications Union normal structure is formulated, can provide the business such as voice, data, short message and wireless Internet access, in Europe and China take the lead in being applied, obtained howling success.Most cities and towns, the current Chinese GSM network-covered whole nation, become the important means of communication of national economy all trades and professions.
Along with the develop rapidly of GSM network, the sensitive information etc. that relates in a large number business and individual need to transmit by GSM mobile handset.As shown in Figure 1, the existing method flow based on GSM voice channel transmission voice.At transmitting terminal, first voice carry out sample quantization after calling party microphone picks up, and then through vocoder, compress processing, then by base station, send after chnnel coding is encoded.Receiving terminal mobile phone receives after signal, first by channel-decoding by signal preliminary decoder, then by vocoder coding, finally by digital-to-analogue conversion, recover speech-like signal and sounded by receiving terminal mobile microphone.Owing to not taking the means of any encryption in whole GSM voice call process, so voice content easily occurs to lose or be cracked, and causes the loss of important information.
Therefore, the appearance of a kind of GSM speech ciphering method based on orthogonal frequency division multiplexi (OFDM), system is necessary.
Utility model content
The utility model, for solving the problems of the technologies described above, is to provide a kind of GSM speech ciphering method, system based on orthogonal frequency division multiplexi (OFDM), can realize succinct, quick, safe, the voice secure communication of GSM cheaply.
The technical problem that the utility model solves realizes by the following technical solutions:
GSM voice encryption system based on OFDM, comprises the following steps:
A, transmitting terminal
S1 is converted to linear pcm digital code stream by A/D modular converter by voice signal, and is transferred to AMBE compression module and carries out data compression;
S2 code stream is after compression encrypted by encrypting module;
Code stream after S3 encrypts is delivered to RPE-LTP compression module compressed encoding after modulating by OFDM module;
Code stream after S4 coding, after interweaving encoding modulator, is sent by antenna for mobile phone;
B, receiving terminal
L1 antenna for mobile phone receives signal, and carries out preliminary decoder by deinterleaving coding demodulator;
The decoded signal of L2 by RPE-LTP decompression module decompression after, deliver to OFDM module and carry out demodulation process;
Signal out of L3 demodulation is through deciphering module deciphering, and delivers to AMBE decompression module and revert to information PCM digital code stream;
L4 linear pcm digital code stream, after the decoding of D/A modular converter, forms decrypted voice stream.
As preferred technical scheme, shown in the modulation system of OFDM module adopt PSK.
As preferred technical scheme, shown in OFDM module adopt C5402DSP chip.
As preferred technical scheme, shown in the pairing of A/D modular converter and D/A modular converter use, shown in the speed of linear pcm digital code stream be 2.4Kb/s.
As preferred technical scheme, shown in the pairing of encrypting module and deciphering module use, enciphering and deciphering algorithm adopts the RC4 algorithm of encrypting based on bit stream.
As preferred technical scheme, shown in the pairing of AMBE compression module and AMBE decompression module use, adopt AMBE-2000 chip.
A system for the GSM voice encryption of OFDM, comprises transmitting terminal module and receiving terminal module, shown in transmitting terminal module and receiving terminal module be arranged at respectively transmitting terminal mobile phone and receiving terminal mobile phone;
Shown in transmitting terminal module comprise A/D modular converter, AMBE compression module, encrypting module, OFDM module, RPE-LTP compression module and interweaving encoding modulator; Shown in A/D modular converter, AMBE compression module, encrypting module, OFDM module, RPE-LTP compression module, interweaving encoding modulator connect successively;
Shown in receiving terminal module comprise deinterleaving coding demodulator, RPE-LTP decompression module, OFDM module, deciphering module, AMBE decompression module and D/A modular converter; Shown in deinterleaving coding demodulator, RPE-LTP decompression module, OFDM module, deciphering module, AMBE decompression module, D/A modular converter connect successively.
The beneficial effect the utlity model has is: adopt OFDM module modulation transmission to be encrypted GSM voice, realized succinct, quick, safe, the voice secure communication of GSM cheaply; Processing delay is little, sound articulation is high, strong security.
Accompanying drawing explanation
Fig. 1 is the utility model: the schematic diagram of the system of the GSM voice encryption based on OFDM;
Wherein: 1-transmitting terminal module, 2-receiving terminal module, 11-A/D modular converter, 12-AMBE compression module, 13-encrypting module, 14-OFDM module, 15-RPE-LTP compression module, 16-interweaving encoding modulator, 21-D/A modular converter, 22-AMBE decompression module, 23-deciphering module, 24-RPE-LTP decompression module, 25-deinterleaving coding demodulator.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
Shown in Fig. 1, a kind of system of the GSM voice encryption based on OFDM, comprises transmitting terminal module 1 and receiving terminal module 2, shown in transmitting terminal module 1 and receiving terminal module 2 be arranged at respectively transmitting terminal mobile phone and receiving terminal mobile phone;
Shown in transmitting terminal module 1 comprise A/D modular converter 11, AMBE compression module 12, encrypting module 13, OFDM module 14, RPE-LTP compression module 15 and interweaving encoding modulator 16; Shown in A/D modular converter 11, AMBE compression module 12, encrypting module 13, OFDM module 14, RPE-LTP compression module 15, interweaving encoding modulator 16 connect successively;
Shown in receiving terminal module 2 comprise deinterleaving coding demodulator 25, RPE-LTP decompression module 24, OFDM module 14, deciphering module 23, AMBE decompression module 22 and D/A modular converter 21; Shown in deinterleaving coding demodulator 25, RPE-LTP decompression module 24, OFDM module 14, deciphering module 23, AMBE decompression module 22, D/A modular converter 21 connect successively.
Wherein: shown in the modulation system of OFDM module 14 adopt PSK, shown in OFDM module 14 adopt C5402DSP chips.Shown in 21 pairings of A/D modular converter 11 and D/A modular converter use, shown in the speed of linear pcm digital code stream be 2.4Kb/s.Shown in 23 pairings of encrypting module 13 and deciphering module use, enciphering and deciphering algorithm adopts the RC4 algorithm of encrypting based on bit stream.Shown in 22 pairings of AMBE compression module 12 and AMBE decompression module use, adopt AMBE-2000 chip.
The method of the GSM voice encryption based on OFDM, comprises the following steps:
A, transmitting terminal
S1 is converted to linear pcm digital code stream by A/D modular converter 11 by voice signal, and the speed of linear pcm digital code stream is 2.4Kb/s, and is transferred to AMBE compression module 12 and carries out data compression, and AMBE compression module 12 adopts AMBE-2000 chips.
S2 code stream is after compression encrypted by encrypting module 13, and enciphering and deciphering algorithm adopts the RC4 algorithm of encrypting based on bit stream.
Code stream after S3 encrypts is delivered to RPE-LTP compression module 15 compressed encodings after modulating by OFDM module 14; Wherein: OFDM module 14 adopts C5402DSP chip, and modulation system adopts PSK.
Code stream after S4 coding, after interweaving encoding modulator 16, is sent by antenna for mobile phone;
B, receiving terminal
L1 antenna for mobile phone receives signal, and carries out preliminary decoder by deinterleaving coding demodulator 25;
The decoded signal of L2 by RPE-LTP decompression module 24 decompression after, deliver to OFDM module 14 and carry out demodulation process;
Signal out of L3 demodulation is through deciphering module 23 deciphering, and delivers to AMBE decompression module 22 and revert to information PCM digital code stream;
L4 linear pcm digital code stream, after 21 decodings of D/A modular converter, forms decrypted voice stream.
The utility model adopts OFDM module 14 modulation transmission to be encrypted GSM voice, has realized succinct, quick, safe, the voice secure communication of GSM cheaply; Processing delay is little, sound articulation is high, strong security.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (1)
1. the GSM voice encryption system based on OFDM, is characterized in that: comprise transmitting terminal module and receiving terminal module, described transmitting terminal module and receiving terminal module are arranged at respectively in transmitting terminal mobile phone and receiving terminal mobile phone; Described transmitting terminal module comprises A/D modular converter, AMBE compression module, encrypting module, OFDM module, RPE-LTP compression module and interweaving encoding modulator; Described A/D modular converter, AMBE compression module, encrypting module, OFDM module, RPE-LTP compression module, interweaving encoding modulator connect successively;
Described receiving terminal module comprises deinterleaving coding demodulator, RPE-LTP decompression module, OFDM module, deciphering module, AMBE decompression module and D/A modular converter; Described deinterleaving coding demodulator, RPE-LTP decompression module, OFDM module, deciphering module, AMBE decompression module, D/A modular converter connect successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320162194.6U CN203446034U (en) | 2013-04-02 | 2013-04-02 | OFDM-based GSM voice encryption system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320162194.6U CN203446034U (en) | 2013-04-02 | 2013-04-02 | OFDM-based GSM voice encryption system |
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| CN203446034U true CN203446034U (en) | 2014-02-19 |
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| CN201320162194.6U Expired - Fee Related CN203446034U (en) | 2013-04-02 | 2013-04-02 | OFDM-based GSM voice encryption system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973436A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Method for transmitting digital information safely in GSM voice channel |
| CN111131141A (en) * | 2019-09-30 | 2020-05-08 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Voice encryption and decryption method and device |
-
2013
- 2013-04-02 CN CN201320162194.6U patent/CN203446034U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103973436A (en) * | 2014-05-16 | 2014-08-06 | 西安电子科技大学 | Method for transmitting digital information safely in GSM voice channel |
| CN111131141A (en) * | 2019-09-30 | 2020-05-08 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Voice encryption and decryption method and device |
| CN111131141B (en) * | 2019-09-30 | 2022-04-29 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Voice encryption and decryption method and device |
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| TR01 | Transfer of patent right |
Effective date of registration: 20160205 Address after: 200235, room 5, building 20, 102 middle Xu Xu Road, Shanghai, Xuhui District Patentee after: Shanghai Sheng Ben Intelligent Technology Co., Ltd. Address before: 200235, 4, 20 middle Xu Xu Road, Shanghai, Xuhui District Patentee before: Shanghai Basewin Technology Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140219 Termination date: 20180402 |
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| CF01 | Termination of patent right due to non-payment of annual fee |