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Synchronous demodulation method and signal receiver for baseband signal

A synchronous demodulation, baseband signal technology, applied in carrier regulation, modulated carrier system, digital transmission system, etc., can solve the problem of high algorithm complexity, low differential demodulation complexity, lack of frequency offset tracking and time offset tracking strategy, etc. question

Active Publication Date: 2021-02-09
YICHIP MICROELECTRONICS (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Defects of the prior art The complexity of differential demodulation is low, but the sensitivity index of reception is not good
The receiving performance of coherent demodulation is good, but the complexity of the algorithm is high, and the implementation cost is high
Existing bluetooth receiver solutions lack frequency offset tracking and time offset tracking strategies, and the stability and robustness of the system are not high

Method used

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  • Synchronous demodulation method and signal receiver for baseband signal
  • Synchronous demodulation method and signal receiver for baseband signal
  • Synchronous demodulation method and signal receiver for baseband signal

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0083] This embodiment provides a synchronous demodulation method of a baseband signal, which is executed by a signal receiver. This embodiment and the following embodiments use a Bluetooth device to transmit a DPSK baseband modulation signal, and the signal receiver receives and decodes the DPSK baseband modulation signal. tone, such as figure 1 ,Specific steps are as follows:

[0084] S101. Acquire a baseband modulation signal of a transmitter.

[0085] In this step, the digital signal of the Bluetooth device is modulated by DPSK and GFSK into a baseband modulation signal, and the transmitter receives the baseband modulation signal transmitted by the Bluetooth device. During the modulation process, the bit stream at the transmitting end is converted into a symbol value through serial / parallel conversion, and is mapped to the angle of rotation according to the constellation map. The initial angle is set to 0, and the angle after rotation is calculated in turn, and the cos an...

Embodiment 2

[0095] This embodiment describes the timing synchronization method in detail on the basis of the above embodiments, the process is executed by the signal receiver, such as figure 2 , including the following steps:

[0096] S201. Acquire a baseband modulation signal of a transmitter.

[0097] S2021. Calculate by using a preset algorithm on the baseband modulation signal, so as to determine the number of samples of the first sampling point.

[0098] S2022. Acquire the first j baseband modulation signals as received signals.

[0099] S2023. Determine the first sampling point based on the j received signals and a preset synchronization sequence.

[0100] S2024. Sampling the baseband modulation signal j times based on the first sampling point, to acquire j sampling data.

[0101] S2025. Subtract the j pieces of sampled data from the preset synchronization sequence respectively to obtain j difference values.

[0102] S2026. Calculate the average of the j difference values ​​to ...

Embodiment 3

[0117] This embodiment refines the demodulation method to the baseband modulation signal on the basis of the above-mentioned embodiment. This embodiment and the following embodiments transmit the DPSK baseband modulation signal with the Bluetooth device, and the signal receiver receives the DPSK baseband modulation signal and performs demodulation, such as image 3 As shown, the details are as follows:

[0118] S301. Acquire a baseband modulation signal of a transmitter.

[0119] S302. Perform timing synchronization on the baseband modulation signal to determine a first sampling point and a frequency offset value.

[0120] S3031. Bring the baseband modulation signal into a first preset algorithm to generate one or more angles.

[0121] S3032. Sequentially calculate the difference between two adjacent angles to generate a difference angle.

[0122] S3033. Compare the difference angles in the constellation diagram to determine a symbol value.

[0123] S3034. Generate a recon...

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Abstract

The present invention provides a synchronous demodulation method of a baseband signal, executed by a signal receiver, comprising: acquiring a baseband modulation signal of a transmitter; performing timing synchronization on the baseband modulation signal to determine a first sampling point and a frequency offset value; Perform time offset correction on the first sampling point based on the frequency offset value and the baseband modulation signal to determine a second sampling point; sample the baseband modulation signal based on the second sampling point to determine a baseband Sampling signals; performing frequency offset correction on the baseband sampling signals to generate baseband demodulation signals. The invention proposes an improved baseband signal synchronization and demodulation method, and improves reception performance and stability through frequency offset compensation and time offset compensation schemes.

Description

technical field [0001] Embodiments of the present invention relate to the field of digital signal processing, and in particular, to a method for synchronous demodulation of baseband signals and a signal receiver. Background technique [0002] At present, there are mainly two methods for demodulating DPSK baseband signals of Bluetooth, differential demodulation and coherent demodulation. Disadvantages of the prior art The complexity of differential demodulation is low, but the sensitivity index of reception is not good. The receiving performance of the coherent demodulation is good, but the complexity of the algorithm is high, and the implementation cost is high. The existing bluetooth receiver scheme lacks frequency offset tracking and time offset tracking strategies, and the stability and robustness of the system are not high. [0003] In the prior art, the demodulation method is generally: differentially demodulate the EDR baseband modulation signal based on the frequenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2655H04L2027/0026
Inventor 左罡胡晨光高杰
Owner YICHIP MICROELECTRONICS (HANGZHOU) CO LTD