Low-power consumption MSK non-coherent digital demodulation method using phase axis detection and demodulator

A technology of digital demodulator and phase detector, applied in the direction of digital transmission system, modulated carrier system, electrical components, etc., can solve the problem of low power consumption requirements of portable wireless communication terminals and poor demodulation performance of non-coherent demodulators And other issues

Inactive Publication Date: 2008-11-12
杭州中科微电子有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that coherent demodulation is difficult to meet the low power consumption requirements of portable wireless communication terminals, and the demodulation performance of traditional non-coherent demodulators is poor. Coherent demodulation method and demodulator formed by the method

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  • Low-power consumption MSK non-coherent digital demodulation method using phase axis detection and demodulator
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  • Low-power consumption MSK non-coherent digital demodulation method using phase axis detection and demodulator

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no. 1 Embodiment

[0092] Such as image 3 The low-power high-performance MSK non-coherent demodulator using phase-axis detection involved in the given first implementation example is shown in the block diagram, and the low-power high-performance MSK non-coherent demodulator using phase-axis detection includes low-pass filtering 102, phase axis generator 103, quantizer 104, phase detection module 105, decision shaper 106, frame synchronization module 107 and symbol synchronization module 108. Phase detection module 105 includes phase detector group 1051 and adder 1052; Decision shaper 106 includes limiter and shaper; Frame synchronization module 107 includes frame synchronization correlator group and clock selection circuit; Symbol synchronization module 108 includes PN code decoding Spreading correlator group 1081 , symbol decision unit 1082 and clock selection circuit 1083 .

[0093] The zero-IF signal output by the analog-to-digital converter is in the form of a complex signal, and its two c...

no. 2 Embodiment

[0105] Figure 8 A block diagram of low power consumption and high performance MSK non-coherent demodulator using phase axis detection involved in the second implementation example is given. Such as Figure 8 As shown, the low-power high-performance MSK non-coherent demodulator using phase-axis detection includes a low-pass filter 202, a phase-axis generator 203, a quantizer 204, a phase detection module 205, a decision shaper 206, and a frame synchronization module 207 , a symbol synchronization module 208 . The phase detection module 205 includes a phase detector group 2051 and an adder 2052; the decision shaper 206 includes a limiter and a shaper; the frame synchronization module 207 includes a frame synchronization correlator group and a clock selection circuit; the symbol synchronization module 208 includes a PN code decoding Correlator group 2081 and symbol decision unit 2082 .

[0106] The input zero-IF signal is in the form of a complex signal, and its two component...

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Abstract

The invention provides a low-power MSK non-coherent digital demodulating method by adopting the phase axis detection and a demodulator which consists of a phase axis generator, a quantizer, a phase detector, a judgment former, correlator groups, a sign judgment device and a clock selection circuit; wherein, the demodulator does not need an independent carrier frequency and a phase restoration circuit or a data restoration clock circuit; DSSS signals can directly de-spread by adopting the correlator groups without a clock and bit restoration circuit; the algorithm of the slopes of phase changes of base-band signals of PN code sequence is adopted in relative judgments, which can overcome the phase cumulative errors caused by the random clock skew of a sending terminal; in addition, the demodulator has a better compensation ability for frequency errors without special frequency compensation circuits; furthermore, the demodulating performance is unrelated with carrier phases and the synchronization performance of DSSS frequency spread and frames and signs is good. The MSK demodulator is characterized by simple demodulating method, low packet loss rate, few hardware expenses, strong anti-noise ability, low power, easy integration, and the like, and can be applied to modern high-end communication terminals.

Description

[0001] Field [0002] The invention belongs to the technical field of wireless communication, and relates to an offset quadrature phase shift keying (O-QPSK) or minimum frequency shift keying (MSK) signal modulation and direct sequence spread spectrum (DSSS) suitable for half-cosine shaping , non-coherent demodulation methods of continuous phase modulation (CPFSK) and quadrature phase-shift keying (QPSK) modulation techniques, especially related to a low-power high-performance MSK non-coherent digital demodulation method and demodulator using phase axis detection. technical background [0003] At present, the signals of offset quadrature phase shift keying (O-QPSK) and minimum frequency shift keying (MSK) using half-cosine shaping have narrow signal bandwidth and good demodulation performance. been widely applied. Traditional half-cosine shaping offset quadrature phase-shift keying (O-QPSK) and minimum frequency shift keying (MSK) signal demodulators generally use coherent di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/233
Inventor 于云丰马成炎肖时茂孟新
Owner 杭州中科微电子有限公司
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