A Word Length Truncation Method for Digital Signal Processing in Anti-jamming Receiver
A digital signal processing and digital signal technology, applied in the transmission system, electrical components, etc., can solve the problems of data unavailability, signal-to-noise ratio loss, etc., achieve the effect of small signal-to-noise ratio loss and overcome data power sensitivity
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Embodiment 1
[0058] This embodiment proposes a digital signal processing word length truncation method in an anti-jamming receiver. The specific operation is: first estimate the power of the digital signal data before truncation; then adjust adaptively according to the estimated power of the digital signal data before the stage Gain, so as to amplify the digital signal data before truncation to the full-scale state; finally, from the digital signal data amplified to the full-scale state, the data of the specified word length is intercepted from the highest bit. The invention overcomes the problems of being sensitive to data power and excessive truncation loss in the prior art, and can minimize the signal-to-noise ratio loss caused by word length truncation in digital signal processing.
Embodiment 2
[0060] This embodiment is on the basis of above-mentioned embodiment 1, as figure 1 As shown, in order to better realize the present invention, further, the digital signal processing word length truncation method is specifically divided into the following steps:
[0061] Step 1: Use an amplifier to amplify the acquired digital signal data;
[0062] Step 2: Calculate the average power of the amplified digital signal data;
[0063] Step 3: Calculate the difference between the average power and the expected power of the amplified digital signal data;
[0064] Step 4: Update the gain of the amplifier according to the difference between the calculated average power and the expected power;
[0065] Step 5: Intercept the data of the specified word length from the highest bit of the amplified digital signal data.
[0066] Other parts of this embodiment are the same as those of Embodiment 1 above, so details are not repeated here.
Embodiment 3
[0068] In this embodiment, on the basis of any one of the above-mentioned embodiments 1-2, in order to better realize the present invention, further, the specific operation of the step 1 is as follows:
[0069] Step 1.1: Set the received digital signal data as , is a signed integer with a word length of a bits, and a is a user-defined value; where, n is the data index number, which is a positive integer;
[0070] Step 1.2: Use an amplifier to analyze the received digital signal data To zoom in, the specific formula for zooming in is:
[0071] ;
[0072] In the formula, is the amplified digital signal data, which is a signed number of bits; is the gain of the amplifier during the kth amplification operation, which is a+ 4-bit positive integer, set the initial value of the amplifier for 2 a+4 -1; k is the number of zoom operations; N It is the data length of each operation, generally take the exponential multiple of 2, such as 1024, 2048, etc.; It is a roundin...
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