A coding and decoding device and modem based on extended Manchester code
A decoding device and decoding technology are applied in the field of communication, which can solve the problems of lack of anti-Doppler frequency shift, loss of demodulation performance, and inability to change the coding magnification, and achieve flexible coding magnification and anti-Doppler frequency. Shift, Doppler shift effect
Active Publication Date: 2019-03-01
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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[0002] The existing Manchester encoding and decoding device uses the transition of two different phase binary codes to represent the transmission symbol, which has rich timing components, simple implementation, and has certain anti-interference performance, but its encoding rate is fixed at the original code rate 2 times, and after demodulation, the decoding is performed by jumping the symbol after the decision, and the soft decoding based on the demodulation information cannot be realized, so that it cannot flexibly change the coding rate according to the bandwidth supported by the channel, and the demodulation performance It has a certain performance loss, and when it is applied to a low-speed transmission communication system with limited bandwidth, it does not have the ability to resist Doppler frequency shift
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[0015] refer to figure 1 , the modem of the present invention is composed of an extended Manchester code encoding device 1 , a modulation module 2 , a demodulation module 3 , and an extended Manchester code decoding device 4 .
[0016] The function of the extended Manchester encoding device 1 of the present invention is to set the encoding multiple according to the communication requirement, select the corresponding encoding code type according to the encoding multiple, and perform Manchester encoding on the symbol to be transmitted. figure 2 It is a block diagram of the electrical principle of the extended Manchester code encoding device 1, and the embodiment is as follows: figure 2 Connect the lines. It consists of a frequency division module 5, a code pattern generation module 6 and an encoding module 7; wherein, the frequency division module 5 divides the frequency of the high-frequency clock to N times (N is determined according to communication requirements) the clock...
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The invention discloses an encoding and decoding device and a modem based on extended Manchester codes. The modem of the present invention is made up of parts such as extended Manchester coding device, modulating module, demodulation module, extended Manchester code decoding device, and it carries out extended Manchester encoding by extended Manchester coding device to treat code element, outputs coding clock and The symbol is modulated by the modulation module to obtain the modulated clock and signal. After the signal is transmitted through the channel, it is sampled to obtain the received signal and sent to the demodulation module. After demodulation, the demodulation module obtains the demodulation clock and demodulation The adjusted soft information is sent to the extended Manchester code decoding device, and the decoded clock and symbols are obtained after the extended Manchester soft decoding. The invention has the characteristics of better anti-carrier frequency deviation, anti-Doppler frequency shift capability and simple implementation, and is especially suitable for low-speed transmission communication systems with Doppler frequency shift and limited bandwidth.
Description
technical field [0001] The invention relates to a device for extended Manchester coding, extended Manchester soft decoding and the like in the communication field. It is especially suitable for low-speed transmission communication systems with limited bandwidth with Doppler frequency shift. Background technique [0002] The existing Manchester encoding and decoding device uses the hopping of two different phase binary codes to represent transmission symbols, which has rich timing components, simple implementation, and certain anti-interference performance, but its encoding rate is fixed at the original code rate of 2. After demodulation, it is decoded by the hopping of the post-decision symbol, which cannot realize soft decoding based on demodulation information, so that it cannot flexibly change the coding ratio according to the bandwidth supported by the channel, and the demodulation performance is improved. It has a certain performance loss, and when it is applied to a l...
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IPC IPC(8): H04L1/00H03M13/11
CPCH03M13/1108H04L1/0056
Inventor 唐秋菊刘莹
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP