Baseband transmitter, baseband receiver, modulation and demodulation system and terminal

A baseband modulation signal and transmitter technology, applied in the modulation carrier system, frequency modulation carrier system, transmission system, etc., can solve the problems of large signal error and hardware cost increase, so as to increase hardware cost, ensure quality, and ensure signal transmission speed Effect

Active Publication Date: 2020-08-21
BEIJING SENSORO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The method in the prior art leads to large errors in the signal demodulated by the baseband receiver, and increases the cost of hardware

Method used

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  • Baseband transmitter, baseband receiver, modulation and demodulation system and terminal
  • Baseband transmitter, baseband receiver, modulation and demodulation system and terminal
  • Baseband transmitter, baseband receiver, modulation and demodulation system and terminal

Examples

Experimental program
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Embodiment 1

[0024] figure 1 It is a schematic structural diagram of a baseband transmitter in Embodiment 1 of the present invention. This embodiment can be used to modulate and scramble a baseband signal to obtain a baseband scrambled signal to be transmitted. Specifically, refer to figure 1 , the baseband transmitter 100 includes: a Hadamard modulation module 110 , a scrambling signal generating module 120 and a scrambling module 130 .

[0025] Wherein, the Hadamard modulation module 110 and the scrambling signal generating module 120 are respectively connected to the scrambling module 130 .

[0026] Specifically, the Hadamard modulation module 110 is configured to group the input digital signals to be transmitted according to the preset spread spectrum signal length; map each signal group into a corresponding baseband modulation signal according to the preset Hadamard matrix, and Each baseband modulation signal is transmitted to the scrambling module respectively.

[0027] Wherein, t...

Embodiment 2

[0044] figure 2 It is a schematic structural diagram of a baseband receiver in Embodiment 2 of the present invention. This embodiment is applicable to the situation of receiving a baseband scrambling signal transmitted by a baseband transmitter and obtaining a baseband demodulation signal from the baseband scrambling signal. Specifically, refer to figure 2 , the baseband receiver 200 includes: a Hadamard demodulation module 210 , a descrambling signal generating module 220 , a descrambling module 230 and a decoder 240 .

[0045] Wherein, the Hadamard demodulation module 210 and the descrambling signal generating module 220 are respectively connected to the descrambling module 230 , and the Hadamard demodulation module 210 is connected to the decoder 240 .

[0046] Specifically, the descrambling signal generating module 220 is used to generate a descrambling signal and transmit the descrambling signal to the descrambling module 230; the descrambling module 230 is used to use...

Embodiment 3

[0058] image 3 It is a schematic structural diagram of a baseband receiver in Embodiment 3 of the present invention. This embodiment refines the embodiment of the present invention on the basis of the above-mentioned embodiments. Specifically, the baseband receiver 200 may also include: a time-frequency synchronization module 250, time offset estimation module 260 and frequency offset estimation module 270; Time-frequency synchronization module 250 is connected with descrambling module 230, time offset estimation module 260 and frequency offset estimation module 270 respectively, time offset estimation module 260 and descrambling signal generation respectively The module 220 is connected to the decision unit 212 , and the frequency offset estimation module 270 is connected to the decision unit 212 .

[0059] Wherein, the time offset estimation module 260 is used to determine the correlation value according to the demodulation result determined by the decision unit 212, the ba...

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Abstract

The embodiment of the invention discloses a baseband transmitter, a baseband receiver, a modulation and demodulation system and a terminal. The baseband transmitter groups input digital signals to betransmitted through a Hadamard modulation module according to a preset spread spectrum signal length; each signal group is mapped into a corresponding baseband modulation signal according to a presetHadamard matrix, and each baseband modulation signal is transmitted to a scrambling module; a scrambling signal is generated through a scrambling signal generation module, and the scrambling signal istransmitted to a scrambling module; and the baseband modulation signal is scrambled by using the scrambling signal through a scrambling module to obtain a baseband scrambling signal. According to thescheme of the embodiment of the invention, the modulation and scrambling of the to-be-transmitted digital signal are realized, a basis is provided for a subsequent baseband receiver to quickly obtaina transmission signal, the signal transmission speed is ensured, the signal transmission quality can also be ensured, and the hardware cost is not increased.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communication, and in particular, to a baseband transmitter, a baseband receiver, a modulation and demodulation system, and a terminal. Background technique [0002] Baseband is a signal with a very narrow frequency range, that is, the magnitude spectrum is non-zero only near the origin (f=0), and other frequencies are almost negligible. In telecommunications and signal processing, the baseband signal is transmitted without modulation, that is, the frequency range of the signal does not have any shift, and the frequency is very low, covering the frequency band from near 0 Hz to a higher cut-off frequency or maximum bandwidth. In the field of communication technology, how to transmit baseband signals has been extensively studied. [0003] In the prior art, the baseband transmitter modulates the baseband signal through multi-ary digital frequency modulation (MFSK) for short, and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/10H04L27/12H04L27/14
CPCH04L27/106H04L27/12H04L27/14
Inventor 李晓明郑波浪李建龙刘伟熊艳伟
Owner BEIJING SENSORO
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