A code-shift keying modulation method and its demodulation method with multiple repetitions of phase shifting
A modulation method and multiple repetition technology, applied in the direction of modulated carrier system, carrier adjustment, phase modulation carrier system, etc., can solve the problems of increased signal power density at the receiving end, decreased signal spectrum expansion width, etc., to reduce demodulation costs, Avoid software and hardware costs and power consumption, and keep the signal power density constant
Active Publication Date: 2020-07-31
SPACE STAR TECH CO LTD
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However, reducing the chip rate of the spread spectrum pseudo-random sequence will lead to a decrease in the spread width of the signal spectrum, resulting in an increase in the signal power density at the receiving end, which is not suitable for satellite communications and satellite navigation and other fields that have strict restrictions on signal landing power flux density
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[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0040] figure 1 The timing diagram of R-CSK modulation is given, and the symbol time length T of the broadcast message is S,R equal to the period time T of the pseudo-random sequence C N times, using K R -bit represents a symbol, the information rate R R =K R / T S,R bps,K R -bit corresponds to the initial phase of the PRN expressed as a decimal value range of that can represent at most Phases, N identical pseudo-random sequences are repeatedly modulated with the same phase (ie figure 1 Medium K R-bit message (m) corresponds to N PRN (m)), sequentially connect N pseudo-random sequences with the same initial phase to form a new modulation symbol, and complete the code shift keying modulation with multiple repeated phase shifts. figure 1 Medium K R - The correspondence between the bit message (m) and the PRN (...
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The present invention relates to a multiple repeated phase shift code shift keying modulation method, and a demodulation method therefor. A set of messages consisting of several binary bits repeatedly modulate, with the same phase and by means of code shift keying, N identical pseudo-random sequences, sequentially connect said N identical pseudo-random sequences having the same initial phase so as to form a new modulation symbol, and complete multiple repeated phase shift code shift keying modulation; a receiving end uses a comb filter to superimpose the received N sets of pseudo-random sequence data within the same symbol into one set of pseudo-random sequence data, and then performs matching filtering with pseudo-random sequences locally generated by the receiving end, searches for pseudo-random sequence phases corresponding to correlation peaks, and completes R-CSK message demodulation. By comprehensively taking into account factors such as spreading gain, information transmission rate, bit error rate, and modulation and demodulation signal processing complexity, said method of the present invention has a better performance than the conventional CSK modulation method.
Description
technical field [0001] The invention belongs to the technical field of communication and navigation signal design, and in particular relates to a code-shift keying modulation method and a demodulation method with multiple repetitions of phase shifting. Background technique [0002] Compared with the DSSS direct-sequence spread spectrum method, the code-shift keying modulation method (referred to as CSK modulation method) can transmit more information bits while maintaining the correlation characteristics of the spread spectrum pseudo-random sequence, and is widely used in spread spectrum communication. [0003] In the conventional CSK modulation mode, the symbol time length T of the modulation message S Generally equal to the cycle time T of the spread spectrum pseudo-random sequence C . For chip length L and cycle time T C The spread spectrum pseudo-random sequence, the maximum broadcast message information rate is R=K / T S , where K is to satisfy 2 K Integer for ≤L con...
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IPC IPC(8): H04L27/20H04L27/12H04L27/00H04L27/22
CPCH04L27/0014H04L27/12H04L27/20H04L27/22
Inventor 王盾陈耀辉李东俊董启甲
Owner SPACE STAR TECH CO LTD