A continuous phase bpsk modulation method and modulation device thereof

A modulation method and phase control word technology, applied in the field of modulation, can solve the problems of sudden phase change, low complexity, and high complexity of CPM modulation, and achieve the effects of low cost, low complexity, and simple structure

Active Publication Date: 2016-06-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to overcome the problem of the phase mutation that exists in the PSK modulation mode existing in the prior art and the high deficiency that the CPM modulation mode realizes complexity, provide a kind of continuous phase BPSK modulation method and modulation device thereof, the modulation The method can overcome the disadvantage of strong spectrum visibility of the signal waveform caused by the phase jump in the PSK modulation mode, and the device for realizing the modulation method has a simple structure and low complexity

Method used

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  • A continuous phase bpsk modulation method and modulation device thereof
  • A continuous phase bpsk modulation method and modulation device thereof
  • A continuous phase bpsk modulation method and modulation device thereof

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Embodiment 1

[0044] Such as figure 1 As shown, the continuous phase BPSK modulation device of the present invention includes a data change detector 201, a frequency selector 204, a carrier phase control word generator 205, an additional accumulation phase control word generator 203, a gate 202, and a phase control word calculator 206 , phase control word accumulator 207 and ROM look-up table 208, wherein,

[0045] The data change detector 201 is used to detect whether the data sent by the current clock is the same as the data sent by the adjacent previous clock, and if the data change detector detects that the data sent by the current clock is the same as the data sent by the adjacent previous clock, then output Signal "1", if the sent data is different, output signal "0".

[0046] The frequency selector 204 is used to select the carrier frequency required for output modulation.

[0047] The carrier phase control word generator 205 is connected to the frequency selector 204 for generatin...

Embodiment 2

[0054] It should be noted that, in this embodiment, M represents the length of the transitional waveform, that is, it represents that the additional accumulated phase reaches π after M clock cycles. K represents the depth of the ROM lookup table, that is, the upper limit value of the address of the ROM lookup table. N means: N discrete sampling signal values ​​are used to represent a period of sinusoidal carrier signal, M has no proportional relationship with N, and M can take any value, which is taken in this embodiment

[0055] refer to Figure 4 , in traditional BPSK modulation, if two adjacent data are different, the modulation waveform will produce a 180-degree phase jump point. The continuous phase BPSK modulation method of the present invention directly changes the mode of the phase control word by additionally accumulating the phase control word, and uses the transition waveform that is continuous in phase with the previous data waveform to smoothly transition to th...

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Abstract

The invention discloses a continuous phase BPSK modulation device, which includes a data change detector, a frequency selector, a carrier phase control word generator, an additional accumulation phase control word generator, a gating device, a phase control word calculator, and a phase control word generator. accumulator and ROM lookup table. The invention also discloses a continuous phase BPSK modulation method. The modulation device of the invention has a simple structure and is easy to realize. The continuous phase BPSK modulation method of the present invention uses the transition waveform that is continuous in phase with the previous data waveform to smoothly transition to the modulation waveform of the current data, thereby realizing the continuity of the modulation waveform and eliminating the gaps in the modulation waveforms of data sent before and after adjacent clocks. Phase jump, thereby eliminating the impulse response caused by phase mutation, concealing the symbol rate information contained in the waveform signal, and increasing the security and confidentiality of communication.

Description

technical field [0001] The invention relates to a modulation method, in particular to a continuous phase binary phase shift keying (Binary Phase Shift Keying, BPSK for short) modulation method. Background technique [0002] Phase Shift Keying (PSK for short) is a modulation technique that uses carrier phase to represent input signal information, that is, uses phase changes to transmit digital information. BPSK, QuadriPhaseShiftKeying (QPSK for short) and OffsetQPSK (OQPSK for short) used in IS-95 and IMT-2000 are all phase shift keying modulation methods. [0003] When using phase shift keying technology for signal modulation, the phase change is sudden. Taking binary phase modulation as an example, when the data transmitted by two consecutive adjacent clocks is consistent, the symbol is taken as "1", the modulated carrier is in phase with the unmodulated carrier, and when the data transmitted by two consecutive adjacent clocks is inconsistent, that is Take the symbol as "...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/18
Inventor 吴廷勇曹灵吉胡剑浩李少谦岳光荣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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