Method and system for detecting FSS by peak threshold, and receiver
View Patent ↗A method and system for detecting FSS by a peak threshold, and a receiver include: a peak search module configured to perform peak search on a set of inputted CIR average values to obtain a set of CIR peaks; a threshold generation module configured to search for a maximum value from the obtained set of CIR peaks, obtain an FSS search threshold according to the maximum value and a preset threshold, and provide the FSS search threshold to an FSS detection module; and the FSS detection module configured to utilize the FSS search threshold to detect an FFT windowing position of a receiving antenna. The technical solutions according to the disclosure improve the protection capability from exceptions for FSS detection while reducing the detection complexity of FSS.
1. A system for detecting Fine Symbol Synchronization (FSS) by a peak threshold, comprising: a peak search module, a threshold generation module and an FSS detection module, wherein
the peak search module is configured to perform peak search on a plurality of sets of inputted Channel Impulse Response (CIR) average values to obtain a set of CIR peaks, each set of CIR average values corresponding to a receiving-transmitting antenna pair, each CIR peak being selected from its respective set of CIR average values;
the threshold generation module is configured to search for a maximum value from the obtained set of CIR peaks, and obtain an FSS search threshold according to the maximum value and a preset threshold; and
the FSS detection module is configured to utilize the FSS search threshold to detect a Fast Fourier Transformation (FFT) windowing position on a signal received by a receiving antenna.
2. The system according to claim 1 , wherein the peak search module is configured to:
perform the peak search on each set {CIR ave (i)} of CIR average values processed by a time accumulator to obtain the set peakmn of CIR peaks on a receiving-transmitting antenna pair mn, wherein
peakmn
=
max
i
{
{
CIR
ave
(
i
)
}
mn
}
,
where m={0,1}, and n={0,1, . . . , N−1}, and a value range of i is determined by an output of an Inverse Discrete Fourier Transform (IDFT) module inputting a value into the time accumulator;
wherein m indicates a receiving antenna index and is equal to one of the numbers in the brackets, n indicates a transmitting antenna index and is equal to one of the numbers in the brackets, mn indicates a receiving-transmitting antenna pair index, and N indicates a total number of transmitting antennas.
3. The system according to claim 1 , wherein the threshold generation module is configured to:
search for the maximum value from an obtained set peakmn of CIR peaks, and obtain a CIR peak peakm on a receiving-transmitting antenna pair mn, wherein
peakm
=
max
n
{
peakmn
}
,
where m={0,1}, and n={0,1, . . . , N−1};
wherein m indicates a receiving antenna index and is equal to one of the numbers in the brackets, n indicates a transmitting antenna index and is equal to one of the numbers in the brackets, mn indicates a receiving-transmitting antenna pair index, and N indicates a total number of transmitting antennas.
4. The system according to claim 1 , wherein the threshold generation module is configured to:
obtain an FSS search threshold thm according to the maximum value and a preset threshold th, wherein thm=th×peakm , where m ={0,1};
wherein m indicates a receiving antenna index and is equal to one of the numbers in the brackets.
5. The system according to claim 1 , wherein the peak search module is configured to:
utilize an FSS search threshold thm provided by the threshold generation module to detect the FFT windowing position on a signal received by a receiving antenna m independently on a receiving-transmitting antenna pair mn;
wherein m indicates a receiving antenna index, and mn indicates a receiving-transmitting antenna pair index.
6. A method for detecting Fine Symbol Synchronization (FSS) by a peak threshold, comprising:
performing, by a peak search module, peak search on a plurality of sets of inputted Channel Impulse Response (CIR) average values to obtain a set of CIR peaks, each set of CIR average values corresponding to a receiving-transmitting antenna pair, each CIR peak being selected from its respective set of CIR average values;
searching, by a threshold generation module, for a maximum value from the obtained set of CIR peaks, and obtaining an FSS search threshold according to the maximum value and a preset threshold; and
utilizing, by an FSS detection module, the FSS search threshold to detect a Fast Fourier Transformation (FFT) windowing position on a signal received by a receiving antenna.
7. The method according to claim 6 , wherein the step of performing peak search on a plurality of sets of inputted CIR average values to obtain a set of CIR peaks comprises:
performing the peak search on each set {CIR cave (i)} of CIR average values processed by a time accumulator to obtain a set peakmn of CIR peaks on a receiving-transmitting antenna pair mn, wherein
peakmn
=
max
i
{
{
CIR
ave
(
i
)
}
mn
}
,
where m={0,1},n={0,1, . . ,N−1}, and a value range of i is determined by an output of an Inverse Discrete Fourier Transform (IDFT) module inputting a value into the time accumulator;
wherein m indicates a receiving antenna index and is equal to one of the numbers in the brackets, n indicates a transmitting antenna index and is equal to one of the numbers in the brackets, mn indicates a receiving-transmitting antenna pair index, and N indicates a total number of transmitting antennas.
8. The method according to claim 6 , wherein the step of searching for a maximum value from the obtained set of CIR peaks comprises:
searching for the maximum value from an obtained set peakmn of CIR peaks, and obtaining a CIR peak peakm on a receiving-transmitting antenna pair mn, wherein
peakm
=
max
n
{
peakmn
}
,
where m ={0,1}, and n={0,1,. . . ,n−1};
wherein m indicates a receiving antenna index and is equal to one of the numbers in the brackets, n indicates a transmitting antenna index and is equal to one of the numbers in the brackets, mn indicates a receiving-transmitting antenna pair index, and N indicates a total number of transmitting antennas.
9. The method according to claim 6 , wherein the step of obtaining an FSS search threshold according to the maximum value and a preset threshold comprises:
obtaining an FSS search threshold thm according to the maximum value and a preset threshold th, wherein thm =th×peakm , where m ={0,1};
wherein m indicates a receiving antenna index and is equal to one of the numbers in the brackets.
10. The method according to claim 6 , wherein the step of utilizing the FSS search threshold to detect an FFT windowing position on a signal received by a receiving antenna comprises:
utilizing an FSS search threshold thm provided by the threshold generation module to detect the FFT windowing position on a signal received by a receiving antenna m independently on a receiving-transmitting antenna pair mn;
wherein m indicates a receiving antenna index, and mn indicates a receiving-transmitting antenna pair index.