Signal demodulation method and baseband receiver

A signal demodulation and signal technology, applied in the direction of carrier adjustment, modulated carrier system, digital transmission system, etc., can solve the problems of sampling clock, timing position deviation, etc., and achieve the effect of improving signal quality and decoding performance

Active Publication Date: 2018-06-22
TP-LINK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a signal demodulation method and a baseband rec...

Method used

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  • Signal demodulation method and baseband receiver
  • Signal demodulation method and baseband receiver

Examples

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Embodiment 1

[0037] figure 1 It shows the implementation process of a signal demodulation method provided by an embodiment of the present invention. The signal demodulation method of this embodiment is applied to a baseband receiver, and the process is described in detail as follows:

[0038] In step S101, a digital baseband signal is acquired.

[0039] In this embodiment, the OFDMA signal modulation technology is adopted. OFDMA is a multiple access technology. OFDMA is based on OFDM modulation. Multi-user access is realized by allocating a certain number of subcarriers to each user, so that multiple Users share frequency band resources through OFDMA.

[0040] In this embodiment, the baseband receiver includes a local oscillator module and an ADC analog-to-digital conversion module.

[0041] In this embodiment, the baseband receiver first obtains the modulated signal sent by the user terminal; the local coherent carrier is generated by the local oscillation module, and the modulated sign...

Embodiment 2

[0136] Such as Image 6 As shown, an embodiment of the present invention provides a baseband receiver 1000 for performing figure 1 The method step in the corresponding embodiment, it comprises:

[0137] The digital baseband signal acquiring module 1010 is configured to acquire the digital baseband signal.

[0138] The preamble field obtaining module 1020 is configured to obtain a preamble field of the digital baseband signal according to the digital baseband signal, and the preamble field includes a preamble training sequence and a preamble information sequence.

[0139] The parameter acquisition module 1030 is configured to obtain public correction parameters and frame configuration information according to the preamble, where the public correction parameters include integer timing positions, estimated frequency offsets, and sampling clock offsets.

[0140] The first signal acquisition module 1040 is configured to process the digital baseband signal according to the public ...

Embodiment 3

[0180] Such as Figure 9 As shown, the embodiment of the present invention also provides a baseband receiver 1000, including a memory 91, a processor 90, and a computer program 92 stored in the memory and operable on the processor, and the processor 90 executes the computer When program 92, realize the steps in each embodiment as described in embodiment 1, for example figure 1 Steps S101 to S106 are shown. Alternatively, when the processor 90 executes the computer program 92, it realizes the functions of each module in each device embodiment as described in Embodiment 2, for example Image 6 The functions of modules 1010 to 1060 are shown.

[0181] The so-called processor 90 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), Off-the-shelf programmable gate array...

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Abstract

The invention is applicable to the technical field of wireless communications, and provides a signal demodulation method and a baseband receiver. The signal demodulation method comprises the followingsteps: acquiring a digital baseband signal; acquiring a leading domain of the digital baseband signal, wherein the leading domain comprises a leading training sequence and a leading information sequence; acquiring a public correction parameter and frame configuration information according to the leading domain, wherein the public correction parameter comprises an integer timing position, a frequency offset estimated value and a sampling clock offset; processing the digital baseband signal according to the public correction parameter and the frame configuration information to acquire a first signal; acquiring a frequency domain signal according to the first signal; and performing demodulation and decoding on the frequency domain signal, thus acquiring data information supported by the frequency domain signal. The signal demodulation method disclosed by the invention realizes compensation and correction of the frequency offset estimated value, a timing position offset and the sampling clock offset, thereby improving the signal quality and the decoding performance.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a signal demodulation method and a baseband receiver. Background technique [0002] WLAN (Wireless Local Area Network Technology) technology is the product of the continuous development and integration of computer and communication technology, and it is also an important branch of wireless network technology. IEEE 802.11a / g / n / ac protocol is one of the most influential wireless local area network protocol standards at present. First, the WLAN system based on IEE 802.11a / g / n / ac adopts OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology as its physical layer access technology, which has been widely used at present. [0003] Currently, WLAN protocols have evolved to 802.11ax on the basis of 802.11a / g / n / ac. , The physical layer access technology is upgraded to OFDMA (Orthogonal Frequency Division Multiple...

Claims

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Application Information

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IPC IPC(8): H04L27/38H04L27/26H04L27/00
CPCH04L27/0014H04L27/2659H04L27/2672H04L27/3854H04L2027/003
Inventor 吴昌强
Owner TP-LINK
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