CN101488940B - Integer frequency offset detection method and apparatus for digital receiver - Google Patents
Integer frequency offset detection method and apparatus for digital receiver Download PDFInfo
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- CN101488940B CN101488940B CN2009103007730A CN200910300773A CN101488940B CN 101488940 B CN101488940 B CN 101488940B CN 2009103007730 A CN2009103007730 A CN 2009103007730A CN 200910300773 A CN200910300773 A CN 200910300773A CN 101488940 B CN101488940 B CN 101488940B
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Abstract
This invention refers to a detection method and a device of digital receiving machine integral multiple frequency deviation. This invention discloses a detection method and a device of digital receiving machine integral multiple frequency deviation with high efficiency aiming to the problems of long searching time and large calculation amount of the integral multiple frequency deviation detection in the current technology. The detection method of digital receiving machine integral multiple frequency deviation comprises following steps: a, performing a difference calculation to a time domain OFDM data after passing a FFT module; b, performing model solving and accumulation to the difference result; c, detecting deviation post of high energy region in an empty carrier wave region so as to acquire the range of integral multiple frequency deviation; d, inputting the range of integral multiple frequency deviation into a PRS detector, when detecting that the PRS is effective, then searching in the range and acquiring the accurate integral multiple frequency deviation. In addition, this invention further discloses a detection device using the detection method. Using this method greatly reduces the searching time, saves the operation amount, improve the detection efficiency. And this invention is suitable for the detection of the digital receiving machine integral multiple frequency deviation.
Description
Technical field
The present invention relates to Digital Signal Processing, specifically, relate to the detection method and the checkout gear of digital receiver integer frequency offset.
Background technology
Digital audio broadcasting (DAB) generally is the modulator approach that adopts OFDM (OFDM), can improve the professional and high-quality mobile reception of data of different types.Its time domain OFDM data is made up of null symbol (Null), phase reference symbol (PRS), data symbol.In the process of digital receiver receiving digital signals,, need reduce as far as possible even eliminate carrier frequency error in order to guarantee the quality of reception.Carrier frequency error mainly is because the difference of transmitter and receiver oscillator produces, and comprises integer frequency multiplication ratio error and decimal overtones band error, is also referred to as integer frequency offset and fractional part of frequency offset.The method of detection integer frequency offset of the prior art is: form OFDM symbol one by one after time domain OFDM data process FFT (fast fourier transform) module, when detection PRS is effective, correlator carries out cyclic shift to obtain relevant peaks with the PRS that the PRS that receives and local PRS generator produce, the PRS detector obtains integer frequency offset by the deviation post of searching maximum correlation peak subsequently, and integer frequency offset enters frequency mixer with data and carries out frequency conversion afterwards.Because above-mentioned detection method has adopted related operation, its advantage is that multipath fading is effective, accuracy is high, but very big shortcoming is arranged also: search time is long, operand is big, for interior frequency deviation search, takes said method can cause detection efficiency extremely low on a large scale especially.The checkout gear of said method correspondence comprises: frequency mixer, FFT module, correlator, PRS detector and local PRS generator; Frequency mixer, FFT module, correlator are connected successively with the PRS detector, local PRS generator join dependency device, and the PRS detector also connects frequency mixer.
Summary of the invention
Technical problem to be solved by this invention is: detect the deficiency that search time is long, operand is big at integer frequency offset of the prior art, propose a kind of high efficiency integer frequency offset detection method and checkout gear.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: the digital receiver integer frequency offset detection method may further comprise the steps:
A. to carrying out calculus of differences through the time domain OFDM data after the FFT module;
B. difference result is asked mould earlier, carry out accumulation process again asking the result behind the mould;
C. detect the high-energy district deviation post in the unloaded ripple district, try to achieve maximum PAR peak to average ratio;
D. with above-mentioned maximum PAR peak to average ratio input phase reference symbol PRS detector, when detecting phase reference symbol PRS when effective, in this scope, search for, obtain accurate integer frequency offset.
Digital receiver integer frequency offset checkout gear comprises frequency mixer, FFT module, phase reference symbol PRS detector, also comprises difference engine, asks the mould device, accumulator and peak to average comparator; Described frequency mixer, FFT module, difference engine, ask mould device, accumulator, peak to average comparator and phase reference symbol PRS detector to connect successively; Described FFT module, frequency mixer all connect phase reference symbol PRS detector; Obtain the baseband sampling value after the frequency conversion of time domain OFDM data process frequency mixer, form OFDM symbol one by one after the baseband sampling value process FFT module, this is comprising null symbol, phase reference symbol PRS and data symbol, one road OFDM symbol enters phase reference symbol PRS detector, another road OFDM symbol enters difference engine, difference engine carries out difference processing to former and later two data symbols that receive, differentiated result's input asks the mould device to ask mould to handle, carry out accumulation process to asking result behind the mould to import accumulator again, enter the peak to average comparator through the data after the accumulation process, the peak to average comparator is tried to achieve maximum PAR peak to average ratio by the deviation post that detects the high-energy district, maximum PAR peak to average ratio is input to phase reference symbol PRS detector, is initial value with this maximum PAR peak to average ratio when phase reference symbol PRS detector detects phase reference symbol PRS just when effective, about it, search for and to search accurate integer frequency offset, subsequently accurate integer frequency offset is fed back to frequency mixer and enter tracking mode.
The invention has the beneficial effects as follows: before PRS arrives, the data symbol is handled, obtained an integer frequency offset scope, when PRS arrives, in this scope, search for, can reduce search time greatly, save operand, and then improve detection efficiency.
Description of drawings
Fig. 1 is a digital receiver integer frequency offset checkout gear block diagram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
The related operation that the present invention has adopted when having abandoned in the prior art integer frequency offset being detected directly detects the mode of PRS, and made full use of the gap of PRS before arriving, the data symbol is handled the integer frequency offset scope that obtains, when arriving, in this scope, searches for PRS, to obtain accurate integer frequency offset, improved detection efficiency greatly.
Digital receiver integer frequency offset detection method among the present invention, adopt following steps to realize: a. is to carrying out calculus of differences through the time domain OFDM data after the FFT module; B. difference result is asked mould, added up; C. detect the high-energy district deviation post in the unloaded ripple district, obtain the integer frequency offset scope; D. with above-mentioned integer frequency offset scope input PRS detector, when detecting PRS when effective, in this scope, search for, obtain accurate integer frequency offset.
As shown in Figure 1, the checkout gear of the digital receiver integer frequency offset among the present invention comprises frequency mixer, FFT module, PRS detector, also comprises difference engine, asks the mould device, accumulator and peak to average comparator; Described frequency mixer, FFT module, difference engine, ask mould device, accumulator, peak to average comparator and PRS detector to connect successively; Described FFT module, frequency mixer all connect the PRS detector.At first obtain the baseband sampling value after the frequency conversion of time domain OFDM data process frequency mixer, through forming OFDM symbol one by one after the FFT module, this is comprising null symbol (Null), phase reference symbol (PRS), data symbol, one road OFDM symbol enters the PRS detector, whether the PRS detector at first detects PRS effective, whether be PRS in other words, if not then not handling, another road OFDM symbol enters difference engine, difference engine carries out difference processing to former and later two data symbols (data symbol comprises data field and unloaded ripple district) that receive, the mould device is asked in differentiated result's input, accumulator, ask mould and accumulation process, then enter the peak to average comparator, because differentiated result can form a high-energy district in unloaded ripple district, the peak to average comparator is exactly to try to achieve PAR peak to average ratio by the deviation post that detects this high-energy district, and find input PRS detector behind the position of maximum PAR peak to average ratio, like this, is initial value with this maximum PAR peak to average ratio when the PRS detector detects PRS just when effective, about it, search among a small circle and can search accurate integer frequency offset, subsequently accurate integer frequency offset is fed back to frequency mixer and enter tracking mode.The calculus of differences of above-mentioned difference engine offseting signal to a certain extent in addition, can improve processing gain by asking mould so that the high-energy district is more obvious with adding up to the influence of accuracy of detection.
Difference engine among the present invention, ask mould device, accumulator and peak to average comparator to be existing finished product device on the market, also can adopt circuit realize according to the technology general knowledge of this area, give unnecessary details no longer one by one here.
Claims (2)
1. digital receiver integer frequency offset detection method is characterized in that: may further comprise the steps:
A. to carrying out calculus of differences through the time domain OFDM data after the FFT module;
B. difference result is asked mould earlier, carry out accumulation process again asking the result behind the mould;
C. detect the high-energy district deviation post in the unloaded ripple district, try to achieve maximum PAR peak to average ratio;
D. with above-mentioned maximum PAR peak to average ratio input phase reference symbol PRS detector, when detecting phase reference symbol PRS when effective, in this scope, search for, obtain accurate integer frequency offset.
2. digital receiver integer frequency offset checkout gear comprises frequency mixer, FFT module, phase reference symbol PRS detector, it is characterized in that: also comprise difference engine, ask the mould device, accumulator and peak to average comparator; Described frequency mixer, FFT module, difference engine, ask mould device, accumulator, peak to average comparator and phase reference symbol PRS detector to connect successively; Described FFT module, frequency mixer all connect phase reference symbol PRS detector; Obtain the baseband sampling value after the frequency conversion of time domain OFDM data process frequency mixer, form OFDM symbol one by one after the baseband sampling value process FFT module, this is comprising null symbol, phase reference symbol PRS and data symbol, one road OFDM symbol enters phase reference symbol PRS detector, another road OFDM symbol enters difference engine, difference engine carries out difference processing to former and later two data symbols that receive, differentiated result's input asks the mould device to ask mould to handle, carry out accumulation process to asking result behind the mould to import accumulator again, enter the peak to average comparator through the data after the accumulation process, the peak to average comparator is tried to achieve maximum PAR peak to average ratio by the deviation post that detects the high-energy district, maximum PAR peak to average ratio is input to phase reference symbol PRS detector, is initial value with this maximum PAR peak to average ratio when phase reference symbol PRS detector detects phase reference symbol PRS just when effective, about it, search for and to search accurate integer frequency offset, subsequently accurate integer frequency offset is fed back to frequency mixer and enter tracking mode.
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| CN2009103007730A CN101488940B (en) | 2009-03-10 | 2009-03-10 | Integer frequency offset detection method and apparatus for digital receiver |
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| CN2009103007730A CN101488940B (en) | 2009-03-10 | 2009-03-10 | Integer frequency offset detection method and apparatus for digital receiver |
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| CN101488940A CN101488940A (en) | 2009-07-22 |
| CN101488940B true CN101488940B (en) | 2011-06-08 |
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| EP1480401A2 (en) * | 2003-05-20 | 2004-11-24 | Samsung Electronics Co., Ltd. | Frequency-offset estimator for multi-carrier reception |
| CN1949754A (en) * | 2006-11-09 | 2007-04-18 | 上海交通大学 | Method for estimating OFDM integer frequency shift based on virtual subcarrier and frequency domain differential sequence |
| CN101014031A (en) * | 2007-02-13 | 2007-08-08 | 鼎芯通讯（上海）有限公司 | Frequency coarse synchronizing method |
| CN101022438A (en) * | 2006-03-30 | 2007-08-22 | 北京新岸线软件科技有限公司 | Compatible DAB digital broadcasting receiver carrier synchronizing method and system |
| CN101207594A (en) * | 2006-12-21 | 2008-06-25 | 鼎芯通讯（上海）有限公司 | Method for implementing frequency coarse synchronizing using energy detection technique |
| CN101330483A (en) * | 2007-06-18 | 2008-12-24 | 安凡微电子(上海)有限公司 | Synchronization method and apparatus for digital audio broadcast receiver |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1480401A2 (en) * | 2003-05-20 | 2004-11-24 | Samsung Electronics Co., Ltd. | Frequency-offset estimator for multi-carrier reception |
| CN101022438A (en) * | 2006-03-30 | 2007-08-22 | 北京新岸线软件科技有限公司 | Compatible DAB digital broadcasting receiver carrier synchronizing method and system |
| CN1949754A (en) * | 2006-11-09 | 2007-04-18 | 上海交通大学 | Method for estimating OFDM integer frequency shift based on virtual subcarrier and frequency domain differential sequence |
| CN101207594A (en) * | 2006-12-21 | 2008-06-25 | 鼎芯通讯（上海）有限公司 | Method for implementing frequency coarse synchronizing using energy detection technique |
| CN101014031A (en) * | 2007-02-13 | 2007-08-08 | 鼎芯通讯（上海）有限公司 | Frequency coarse synchronizing method |
| CN101330483A (en) * | 2007-06-18 | 2008-12-24 | 安凡微电子(上海)有限公司 | Synchronization method and apparatus for digital audio broadcast receiver |
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