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Joint LDPC encoding recursive MSK modulation and demodulation system and method therefor

A modulation, demodulation, and coding technology, applied in the field of joint coding modulation and demodulation systems, can solve the problems of high implementation complexity, affect practicability, and cannot completely eliminate the influence of differential coding, and achieve rapid demodulation and decoding. The effect of performance loss

Active Publication Date: 2009-12-23
TSINGHUA UNIV
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Problems solved by technology

The disadvantage is that the interleaving structure is added between the LDPC code and MSK, which makes the implementation of the whole system more complex, and it cannot completely eliminate the influence of differential coding in MSK, which affects the practicability of the method

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  • Joint LDPC encoding recursive MSK modulation and demodulation system and method therefor
  • Joint LDPC encoding recursive MSK modulation and demodulation system and method therefor
  • Joint LDPC encoding recursive MSK modulation and demodulation system and method therefor

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Embodiment Construction

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0020] The main purpose of the present invention is to fully integrate the differential coding part of recursive MSK into LDPC codes, completely eliminate the performance loss caused by MSK differential coding, and make full use of the characteristics of differential demodulation of recursive MSK, without the need for precise carrier synchronization , to quickly realize the detection of the LDPC code frame synchronization header sequence, and then switch to MSK coherent demodulation, perform synchronization and LDPC decoding, and realize ...

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Abstract

The invention provides a joint LDPC encoding recursive MSK modulation and demodulation system, which comprises a transmitting end and a receiving end. The transmitting end comprises an LDPC external encoder and a recursive MSK modulator, and the receiving end comprises a quadrature down conversion and low-pass filter, a coarse carrier frequency offset estimation module, a buffer, a demodulation selector, an MSK differential demodulator, an N frame synchronization head-related detector, an MSK coherent demodulator, a carrier and timing synchronization processing module, a parallel / series conversion module and an LDPC decoder. The invention completely eliminates the performance loss caused by MSK differential encoding by fully integrating the recursive MSK differential encoding part into LDPC codes, fully utilizes the characteristic that the recursive MSK can carry out the differential demodulation, rapidly realizes the detection of frame synchronization head sequence of the LDPC codes under the premise of having no need of precise carrier synchronization, further switches to the MSK coherent demodulation, carries out synchronization and LDPC decoding and realizes the functions of rapid demodulation and decoding.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a joint coding modulation and demodulation system and method. Background technique [0002] When using a nonlinear power amplifier in digital communication, in order to improve the signal receiving performance, continuous phase constant envelope modulation can be used. Among them, MSK (Minimum Shift Keying, minimum phase shift keying) modulation has good spectrum characteristics, can work in the saturated working area with the highest efficiency of nonlinear power amplifier, and is simple to implement and has good bit error performance, so it is used in wireless, satellite and It has been widely used in deep space communication. [0003] MSK modulation is a continuous phase modulation, and its modulator can be decomposed into a binary continuous phase encoder (CPE) with a code rate of 1 / 2 and a memoryless modulator. According to whether CPE is recursive or non-rec...

Claims

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Application Information

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IPC IPC(8): H04L27/00H03M13/11H04L1/00
CPCH03M13/1105H03M13/1185H03M13/2957H03M13/6325
Inventor 詹亚锋包建荣万增然陆建华
Owner TSINGHUA UNIV
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