Binary frequency shift keying signal, modulation and demodulation
Does a communication signal have fingerprint characters? This paper discusses the existence probability of fingerprint characteristics of communication signals, analyzes the fingerprint characteristics of 2FSK signals, and extracts some fingerprint characteristics of 2FSK signals.
People have fingerprint characteristics that represent personal attributes. Does the radio communication signal (hereinafter referred to as the signal) have the electronic "fingerprint" feature (hereinafter referred to as the "fingerprint" feature) that describes a single radio station? In this paper, the possibility that the signal has fingerprint characteristics is analyzed, and taking the 2FSK signal as an example, the fingerprint characteristics that the 2FSK signal should have are discussed, and some fingerprint characteristics are extracted.
According to the characteristics of 2FSK signal and 2PSK signal, a weak signal detection method based on Duffing chaotic oscillator is proposed to detect 2FSK signal and 2PSK signal.
On the basis of studying the weak signal detection method of Duffing chaotic oscillator, a new signal detection method of 2FSK and 2PSK is proposed according to the characteristics of 2FSK and 2PSK signals.
In order to obtain the upper and lower side frequency and baseband low frequency information of railway binary frequency shift keying (2FSK) signal in real time and with high accuracy, a new frequency detection algorithm compatible with domestic system and French UM7 1 system is proposed.
In order to obtain real-time and high-precision low-frequency information of railway binary frequency shift keying signal, a new frequency detection method compatible with domestic and French UM7 1 systems is proposed.
The goal of the communication system platform is to model and calculate the modulation and demodulation of AM, FM, SSB, 2ASK, 2FSK, 2PSK and 2QPSK signals.
The task of the communication simulation platform is to model and calculate the modulation and demodulation of seven communication signals, including AM, FM, SSB, binary amplitude keying, binary frequency shift keying, binary phase shift keying and quadrature phase shift keying.
The hardware and software of 2FSK modem, AT89C5 1 MCU addressing control for PLL mixing are introduced emphatically.
This paper introduces a cable TV charging system based on single chip microcomputer addressing control, focuses on the analysis of the hardware and software of the system using 2FSK modulation and demodulation phase-locked frequency synthesis technology and single chip microcomputer AT89C5 1 addressing control, and introduces the system's use of broadband working characteristics of PIN tube to turn off high-frequency TV signals and the anti-interference measures of the system.
The 308mhz/315mhz/418mhz/433.92mhz low-power FSK superheterodyne receiver adopts the high-integration, low-power CMOS superheterodyne RF receiver chip in MAX7042, and the sensitivity range is-1 10 dBm to-/kloc-.
The designed 308mhz/315mhz/418mhz/433.92mhz low-power FSK superheterodyne receiving circuit adopts CMOS superheterodyne RF receiving chip with high integration and low power consumption, and the sensitivity is-10 ~-6550.
Experiments on two systems based on two binary frequency shift keying (2FSK) modems verify the effectiveness of the algorithm.
Two binary frequency shift keying modems are used to build the system, and the experimental results show that this method is effective.
This paper introduces the working principle, algorithm analysis and software design method of a simplified V.23 2FSK modem based on programmable chip DSP.
This paper introduces the working principle, algorithm analysis and software design method based on programmable device DSP of a simple V.23 binary frequency shift keying (2FSK) modem.
This paper introduces an automatic fire alarm system consisting of iron smoke detector NC 14468, microcontroller 805 1 and RF transceiver nRF40 1. With the introduction of nRF40 1 and the adoption of wireless communication technology and FSK technology, the performance of the system in real-time and high reliability is improving day by day.
This paper discusses the automatic fire alarm system composed of MC 14468 ion smoke detector, single chip microcomputer 805 1 and nRF40 1 single chip RF transceiver. With the introduction of nRF40 1 RF transceiver with wireless communication technology and FSK (frequency shift keying) modulation and demodulation technology as the core, the performance of the system is greatly improved, especially the alarm of the system is more real-time and reliable.
Experiments on two systems based on two binary frequency shift keying (2FSK) modems verify the effectiveness of the algorithm.
Two binary frequency shift keying modems are used to build the system, and the experimental results show that this method is effective.
Based on the simulation, the analog signals modulated by GMSK (Gaussian filtered minimum shift keying) baseband in AIS equipment are deeply studied in this paper.
The technology involved in this paper enables the modulation and demodulation of baseband signals to be realized on TI DSP, and also provides a key technology for the development of AIS system in China.
This paper focuses on the simulation research of minimum shift keying (GMSK- Gaussian Filter Frequency Shift Keying) baseband modulation and demodulation signal of AIS- automatic identification system. On the basis of simulation, the modulation and demodulation of baseband signal are realized on the DSP of TI company, which reserves the key technology for developing AIS system in China.
In addition, based on the designed fiber grating and wavelength division multiplexing technology, a frequency shift keying optical fiber wireless communication system is proposed, which can be used as one of the candidate schemes for the next generation of high-speed and large-capacity optical fiber wireless communication system.
At the same time, based on the designed fiber grating and wavelength division multiplexing technology, a frequency shift keying optical fiber wireless communication system Radio Over Fiber system is proposed, which provides a feasible alternative for the next generation of high-speed and large-capacity optical fiber wireless communication system.
In this scheme, the telecommunication bureau is used to provide calling information to users (inserting the calling number and other related information between the first ringing and the second ringing of the user terminal), and a platform using binary frequency shift keying (FSK) decoding technology is established at the user side to receive the calling (reporting) phone number, and then the calling (reporting) data and information are found through the database in the business equipment, and the corresponding police action plan is selected.
Using the service of providing calling information to users by telecommunication bureau (inserting calling number and other related information between the first ringing and the second ringing of the user terminal), a platform using binary frequency shift keying (FSK) decoding technology is established at the user terminal, the calling (alarm) phone number is received, the calling (alarm) information is queried through the database in the server, and then the corresponding alarm scheme is evaluated and the source of the phrase is added.
Aiming at the traditional minimum shift keying (MSK) modulation and demodulation, a new digital MSK modulation and demodulation model based on VHDL is proposed.
Aiming at the traditional minimum shift keying (MSK) modulation and demodulation method, a digital MSK modulation and demodulation model based on VHDL is proposed.
This paper introduces the concept, classification, research status and system structure of space-time coding cooperation, puts forward a space-time coding cooperation based on space-time frequency keying, and analyzes its performance.
This paper introduces the basic concept, classification, research status and system structure of cooperative diversity technology, puts forward a space-time coding cooperative diversity method designed by space-time frequency shift keying, and analyzes its performance.
Space-time frequency keying (ST-FSK) combines the advantages of space-time block codes and frequency keying, and does not need any channel state information at the transmitter and receiver, so incoherent ML detector can be used in Rayleigh fading channel [1].
Space-time frequency shift keying (ST- FSK) combines the advantages of space-time block codes and frequency shift keying. In Rayleigh fading channel, channel information is not needed, and incoherent maximum likelihood detector can be used.
In this scheme, FSK-FDM technology is used for subcarrier modulation, and the monitoring information of EDFA is transmitted through light intensity modulation.
In this scheme, frequency shift keying frequency division multiplexing (FSK FDM) technology is used for audio subcarrier modulation, and remote on-line EDFA monitoring information is transmitted with the main signal through light intensity modulation.
There are three basic types of digital modulation signals: shielded, MPSK and MFSK.
Digital modulation signals are divided into three basic types: M-ary amplitude keying mask, M-ary phase shift keying MPSK and M-ary frequency shift keying MFSK.
In order to improve the baud rate of the system, GMSK (Gaussian in filtered minimum shift keying) modulation method is used to replace ASK (amplitude shift keying) modulation method in the current IF digital system.
In order to improve the transmission rate of the system, GMSK (Gaussian filtered minimum shift keying minimum shift keying) modulation is adopted to replace ASK (amplitude shift) in the current "secure communication network".
Keyed amplitude shift keying) modulation mode.
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