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Digital detection and error correction algorithm for fsk modulation system

A technology of modulation system and digital detection, which is applied in FM carrier system, transmission system, digital transmission system, etc. It can solve the problems of unfixed phase change, residual frequency deviation, high bit error rate, etc., and achieve the ability of good residual frequency deviation, Guarantee the effect of high precision and wide application range

Inactive Publication Date: 2018-02-06
中科威发半导体(苏州)有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, due to noise interference, residual frequency deviation and other interference, the phase change caused by 0 or 1 is not fixed and the absolute value is different
If the decision is made directly based on the phase change, the bit error rate will be high

Method used

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  • Digital detection and error correction algorithm for fsk modulation system
  • Digital detection and error correction algorithm for fsk modulation system
  • Digital detection and error correction algorithm for fsk modulation system

Examples

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Embodiment 1

[0030] Example 1: see attached figure 2 Shown flow process, a kind of digital detection and error correction algorithm for FSK modulation system, it comprises the following steps:

[0031] Step 1: Extract the original phase information from the data received by the FSK modulation system.

[0032] The data received by the FSK modulation system is the baseband signal with the intermediate frequency at 0 frequency and passed through low-pass filtering, and the data received by the FSK modulation system is the receiving end of the FSK modulation system through radio frequency reception, down conversion, AD conversion, The baseband signal obtained after frequency synchronization and low-pass filtering operations. In the first step, the baseband signal received by the FSK modulation system is sampled according to the symbol rate, that is, one sampling point is taken for each symbol, and the phase value of each received bit is obtained by the phase calculation method. In [0,2π) or...

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Abstract

The invention relates to a digital detection and error correction algorithm for FSK modulation system, which includes the following steps: the first step: extracting the original phase information from the received data; the second step: performing signal detection to obtain the received signal; the second step Step 3: Calculate new phase information; Step 4: Compare and make difference to obtain differential phase information; Step 5: Delay difference to obtain the difference of differential phase information; Step 6: Determine whether the difference of differential phase information exceeds the first Threshold, if it is, enter the error correction state, otherwise continue to judge; the seventh step: in the error correction state, judge whether the influence of the error bit is over, if it is, obtain the receiving error pattern, if not, then continue to judge; the eighth step: set The received error pattern is compared with the known error pattern to determine the position of the error bit. The error correction method of the invention has better ability to resist residual frequency deviation, improves error correction performance, and ensures high precision of detection results.

Description

technical field [0001] The invention relates to a digital detection and error correction algorithm for FSK modulation system, in particular to a signal detection and error correction method suitable for continuous phase FSK modulation system. Background technique [0002] FSK digital modulation technology has been widely used in low-power, short-distance wireless communication systems due to its high spectrum utilization and stability, such as Bluetooth and many short-distance wireless communication devices operating in the 2.4GHz frequency band on the market FSK modulation is applied. [0003] In order to eliminate the influence of high-frequency noise caused by phase mutation, continuous phase modulation FSK system and GFSK (Gaussian frequency shift keying) system are widely used at present. The GFSK system further eliminates high-frequency information through Gaussian filtering. [0004] The signal detection of the FSK system is currently divided into coherent detection ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/12H04L1/00
Inventor 彭锦周立国石钦石寅
Owner 中科威发半导体(苏州)有限公司
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