CN113259290A - Signal receiving apparatus, communication system, and signal receiving method - Google Patents
Signal receiving apparatus, communication system, and signal receiving method Download PDFInfo
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- CN113259290A CN113259290A CN202110520221.1A CN202110520221A CN113259290A CN 113259290 A CN113259290 A CN 113259290A CN 202110520221 A CN202110520221 A CN 202110520221A CN 113259290 A CN113259290 A CN 113259290A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The invention relates to a signal receiving device, a communication system and a signal receiving method, wherein the signal receiving device is provided with a receiving module, a first filter, a second filter, a frequency offset estimation module and a frequency offset compensation module, a communication signal is received by the receiving module, then the first filter filters the communication signal to obtain a first signal, the second filter filters the communication signal to obtain a second signal, the frequency bandwidth of the second filter is lower than that of the first filter, so that the frequency bandwidth of the second filter is narrower, the noise interference of the second signal is less than that of the first signal, the frequency offset estimation module carries out frequency offset estimation on the second signal, the obtained frequency offset estimation value is more accurate, and finally the frequency offset compensation module carries out compensation precision on the first signal based on the frequency offset estimation value.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a signal receiving apparatus, a communication system, and a signal receiving method.
Background
The sixth generation wireless network WiFi 6 star is up to 1024QAM (the star of WiFi 5 is only 256QAM), and the sub-carrier spacing is only one quarter of WiFi 5, so the accuracy requirement of WiFi 6 on frequency offset estimation is much higher than that of WiFi 5.
For a receiving end in a communication system, the frequency deviation may cause the overall performance loss of the receiving end. After the frequency offset compensation is carried out on the general receiving end, the influence of the frequency offset can be inhibited; however, due to the channel environment and noise, the frequency offset compensation may not be accurate, and finally the performance of the receiving end is affected, which is especially significant for a system with a relatively long signal frame. Therefore, a signal receiving apparatus capable of improving the frequency offset compensation accuracy is urgently needed.
Disclosure of Invention
In view of the above, it is desirable to provide a signal receiving apparatus, a communication system, and a signal receiving method.
A signal receiving apparatus comprising:
a receiving module for receiving a communication signal;
the first filter is connected with the receiving module and used for filtering the communication signal to obtain a first signal;
the second filter is connected with the receiving module and used for filtering the communication signal to obtain a second signal, wherein the frequency bandwidth of the second filter is lower than that of the first filter;
the frequency offset estimation module is connected with the second filter and used for obtaining a frequency offset estimation value according to the second signal;
and the frequency offset compensation module is respectively connected with the first filter, the frequency offset estimation module and the signal processing terminal, and is used for performing frequency offset compensation on the first signal according to the frequency offset estimation value and transmitting the first signal to the signal processing terminal.
In one embodiment, the communication signal includes a long training code field, and the frequency bandwidth of the second filter matches the frequency bandwidth of the long training code field.
In one embodiment, the first filter is a high order linear phase filter and the second filter is a low order nonlinear phase filter.
In one embodiment, the communication signal includes a data frame field, and the frequency bandwidth of the first filter is matched to the frequency bandwidth of the data frame field.
In one embodiment, the receiving module includes:
an antenna for receiving a radio frequency signal;
and the radio frequency circuit is respectively connected with the antenna, the first filter and the second filter, and is used for converting a radio frequency signal into an electric signal to serve as the communication signal and respectively transmitting the electric signal to the first filter and the second filter.
In one embodiment, the signal receiving apparatus further includes:
and the analog-to-digital conversion module is respectively connected with the radio frequency circuit, the first filter and the second filter, and is used for converting the communication signal from an analog signal to a digital signal and respectively transmitting the digital signal to the first filter and the second filter.
In one embodiment, the signal receiving apparatus further includes:
and the Fourier transformer is respectively connected with the frequency offset compensation module and the signal processing terminal and is used for converting the first signal from a time domain to a frequency domain and transmitting the first signal to the signal processing terminal.
In one embodiment, the frequency offset compensation module is a mixer.
A communication system, comprising:
a signal processing terminal; and
the signal receiving apparatus of any of the above.
A signal receiving method comprising:
receiving a communication signal;
filtering the communication signal by using a first filter to obtain a first signal, wherein the first filter is a high-order filter;
filtering the communication signal by using a second filter to obtain a second signal, wherein the frequency bandwidth of the second filter is lower than that of the first filter;
and obtaining a frequency offset estimation value according to the second signal, and performing frequency offset compensation on the first signal according to the frequency offset estimation value.
The signal receiving device is provided with a receiving module, a first filter, a second filter, a frequency offset estimation module and a frequency offset compensation module, wherein the communication signal is received through the receiving module, then the first filter filters the communication signal to obtain a first signal, the second filter filters the communication signal to obtain a second signal, the frequency bandwidth of the second filter is lower than that of the first filter, so that the noise interference of the second signal is less than that of the first signal due to the narrower frequency bandwidth of the second filter, the frequency offset estimation module performs frequency offset estimation on the second signal, the obtained frequency offset estimation value is more accurate, and finally the frequency offset compensation module performs compensation on the first signal based on the frequency offset estimation value with higher precision.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a signal receiving apparatus according to an embodiment;
fig. 2 is a schematic structural diagram of a signal receiving apparatus according to another embodiment;
fig. 3 is a schematic structural diagram of a signal receiving apparatus according to another embodiment.
Element number description:
a receiving module: 101, a first electrode and a second electrode; a first filter: 102, and (b); a second filter: 103; a frequency offset estimation module: 104; a frequency offset compensation module: 105; a signal processing terminal: 106; an antenna: 107; a radio frequency circuit: 108; an analog-to-digital conversion module: 109
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have electrical signals or signal transmission therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
Fig. 1 is a schematic structural diagram of a signal receiving apparatus according to an embodiment, as shown in fig. 1, the signal receiving apparatus includes a receiving module 101, a first filter 102, a second filter 103, a frequency offset estimation module 104, and a frequency offset compensation module 105, where the receiving module 101 is configured to receive a communication signal; the first filter 102 is connected to the receiving module 101, and is configured to filter the communication signal to obtain a first signal; the second filter 103 is connected to the receiving module 101, and configured to filter the communication signal to obtain a second signal, where a frequency bandwidth of the second filter 103 is lower than a frequency bandwidth of the first filter 102; the frequency offset estimation module 104 is connected to the second filter 103, and configured to obtain a frequency offset estimation value according to the second signal; the frequency offset compensation module 105 is connected to the first filter 102, the frequency offset estimation module 104 and the signal processing terminal 106, and configured to perform frequency offset compensation on the first signal according to the frequency offset estimation value, and transmit the first signal to the signal processing terminal 106.
The receiving module 101 can receive the communication signal in a wireless manner, and since the communication signal is exposed in a wireless space and is very prone to be interfered by an external adjacent frequency, the first filter 102 can be arranged to filter the communication signal, wherein the first filter 102 can be a wideband filter, and has a high signal-to-noise ratio characteristic, so that the adjacent frequency interference information in the communication signal can be efficiently filtered, and the first signal with a high signal-to-noise ratio is obtained, thereby meeting the requirement of the high signal-to-noise ratio of the later-stage signal processing terminal 106 during carrier signal demodulation. The second filter 103 may be a narrow band filter with a bandwidth lower than that of the first filter 102, and because the bandwidth is narrower, the second filter can filter more interference information in the communication signal to obtain a purer second signal, and the frequency offset estimation value obtained by the frequency offset estimation module 104 according to the second signal is more accurate.
Further, after obtaining the frequency offset estimation value, the frequency offset compensation module 105 may perform frequency offset compensation on the first signal, and transmit the first signal to the signal processing terminal 106. Specifically, the frequency offset compensation module 105 may modify the frequency of the first signal according to the frequency offset estimation value, so as to improve the frequency offset of the first signal.
The signal receiving apparatus of the embodiment of the present invention is provided with a receiving module 101, a first filter 102, a second filter 103, a frequency offset estimation module 104, and a frequency offset compensation module 105, wherein the receiving module 101 receives a communication signal, then the first filter 102 filters the communication signal to obtain a first signal, the second filter 103 filters the communication signal to obtain a second signal, wherein a frequency bandwidth of the second filter 103 is lower than a frequency bandwidth of the first filter 102, so that the frequency offset estimation module 104 performs frequency offset estimation on the second signal, an obtained frequency offset estimation value is more accurate, and finally the frequency offset compensation module 105 compensates the first signal based on the frequency offset estimation value.
In one embodiment, the communication signal includes a long training code field, and the frequency bandwidth of the second filter 103 is matched to the frequency bandwidth of the long training code field.
It is understood that the communication Signal may be based on a packet format specified in the IEEE 802.11 wireless standard, and includes a preamble (which may be divided into three parts, namely, a short Training Field (stf), a Long Training Field (LTF), and a Signal Field (SIG), and the frequency offset estimation module 104 uses the Long Training Field (LTF) to perform the CFO carrier frequency offset estimation, specifically, uses the autocorrelation of the LTF long Training Field in the time domain to perform the frequency offset estimation, so that the frequency bandwidth of the second filter 103 may be set to match the frequency bandwidth of the long Training Field, thereby improving the accuracy of the frequency offset estimation.
In one embodiment, the first filter 102 may be a high order linear phase filter and the second filter 103 may be a low order nonlinear phase filter.
It can be understood that the high order linear phase filter can meet the requirement of high signal to noise ratio of the signal processing terminal 106, so that the signal to noise ratio of the processed communication signal is higher, and the signal to noise ratio requirement of the signal processing terminal 106 is better met. And the price of the low-order nonlinear phase filter is lower than that of the high-order linear phase filter, and the cost can be saved by adopting the low-order nonlinear phase filter.
In one embodiment, the communication signal includes a data frame field, and the frequency bandwidth of the first filter 102 matches the frequency bandwidth of the data frame field.
It can be understood that the communication signal based on the packet format specified in the IEEE 802.11 wireless standard further includes a data frame field, and the first filter 102 with the frequency bandwidth matching the frequency bandwidth of the data frame field is used to perform filtering processing on the communication signal, so that the integrity of the data frame field is ensured and the communication signal is not lost due to the processing of the first filter 102.
For example, the bandwidths of the long midamble field and the data frame field defined in the IEEE 802.11n HT (a.ka.wifi 4) protocol and the IEEE 802.11ac VHT (a.ka.wifi 5) protocol standards are 16.25MHz (312.5 kHz 52 16.25MHz) and 17.5MHz (312.5 kHz 56 17.5MHz), respectively, that is, the system data frame field bandwidths of WiFi 4 and WiFi 5 are 7.7% more (17.5MHz/16.25MHz-1 is 7.07%) than the long midamble field bandwidth, if the communication signal is processed by only the first filter 102, and the processed communication signal is further frequency offset estimated and compensated, respectively, the frequency offset estimation is performed because of the 7.7% noise, so the accuracy of the estimated frequency offset value is reduced, and therefore, the frequency bandwidth of the communication signal is matched with the bandwidth of the long midamble field, and the bandwidth of the data frame field is processed by the second filter 103, and the first filter 102, respectively, to obtain a first signal and a second signal, respectively.
The frequency bandwidths of the long training code field and the data frame field specified in the IEEE 802.11ax HE (a.ka. WiFi 6) protocol standard are 16.25MHz (312.5 kHz 52 16.25MHz) and 19.06MHz (78.125 kHz 244 19.06MHz), respectively, that is, the frequency bandwidth of the system data frame field in WiFi 6 is 17.3% greater than the frequency bandwidth of the long training code field, and compared with only 7.7% greater in WiFi 4 and WiFi 5, the difference between the frequency bandwidths of the long training code field and the data frame field in WiFi 6 is larger. In addition, since the subcarrier spacing of the WiFi 6 data frame field is only one fourth of the subcarrier spacing of WiFi 3/4/5, and compared with the star 256QAM of WiFi 5 and the star 256QAM of WiFi 4, and the star of WiFi 6 is 1024QAM, the accuracy requirement of the frequency offset estimation by WiFi 6 is much higher than that of WiFi 4 and WiFi 5, so if only the first filter 102 is used to process the communication signal, and then the frequency offset estimation and frequency offset compensation are respectively performed on the processed communication signal, which finally results in the reduction of the signal-to-noise ratio of the communication signal received by the receiving terminal and the reduction of the data throughput.
Fig. 2 is a schematic structural diagram of a signal receiving apparatus according to another embodiment, and as shown in fig. 2, the receiving module 101 includes an antenna 107 and a radio frequency circuit 108, where the antenna 107 is used for receiving radio frequency signals; the radio frequency circuit 108 is connected to the antenna 107, the first filter 102, and the second filter 103, respectively, and is configured to convert the radio frequency signal into an electrical signal as a communication signal, and transmit the electrical signal to the first filter 102 and the second filter 103, respectively.
In one embodiment, the signal receiving apparatus further includes an analog-to-digital conversion module 109, as shown in fig. 3, the analog-to-digital conversion module 109 is respectively connected to the radio frequency circuit 108, the first filter 102 and the second filter 103, and is configured to convert the communication signal from an analog signal into a digital signal, and transmit the digital signal to the first filter 102 and the second filter 103 respectively.
In one embodiment, the signal receiving apparatus further includes a fourier transformer (not shown) connected to the frequency offset compensation module 105 and the signal processing terminal 106, respectively, for converting the first signal from time domain to frequency domain and transmitting to the signal processing terminal 106.
It can be understood that, when the communication signal is subjected to multi-carrier modulation, the frequency offset compensated communication signal needs to be converted from the time domain to the frequency domain for further transmission to the signal processing terminal 106 for data demodulation.
In one embodiment, the frequency offset compensation module 105 may be a mixer.
The embodiment of the present invention further provides a communication system, which includes a signal processing terminal 106; and a signal receiving apparatus as in any of the above embodiments.
The embodiment of the invention also provides a signal receiving method, which comprises the following steps:
step S110, a communication signal is received.
Wherein the communication signal may be received by wireless communication, for example, an antenna 107 assembly including an antenna 107 and a radio frequency circuit 108 may be used.
In step S120, the communication signal is filtered by the first filter 102 to obtain a first signal.
Because the communication signal is exposed in the wireless space and is very prone to be interfered by external adjacent frequency, the first filter 102 can be arranged to filter the communication signal, wherein the first filter 102 can be a broadband filter and has a high signal-to-noise ratio characteristic, and can efficiently filter the adjacent frequency interference information in the communication signal to obtain a first signal with a high signal-to-noise ratio, so that the requirement of the post-processing terminal 106 on the high signal-to-noise ratio during carrier signal demodulation is met.
In step S130, the communication signal is filtered by the second filter 103 to obtain a second signal, wherein the frequency bandwidth of the second filter 103 is lower than the frequency bandwidth of the first filter 102.
The second filter 103 may be a narrow band filter with a bandwidth lower than that of the first filter 102, and because the bandwidth is narrower, the second filter can filter more interference information in the communication signal to obtain a purer second signal, and the frequency offset estimation value obtained by the frequency offset estimation module 104 according to the second signal is more accurate.
Step S140, obtaining a frequency offset estimation value according to the second signal, performing frequency offset compensation on the first signal according to the frequency offset estimation value, and transmitting the first signal to the signal processing terminal 106.
In the embodiment of the present invention, the communication signal is received, then the first filter 102 is used to filter the communication signal to obtain the first signal, and the second filter 103 is used to filter the communication signal to obtain the second signal, wherein the frequency bandwidth of the second filter 103 is lower than the frequency bandwidth of the first filter 102, so that the noise interference of the second signal is less than that of the first signal, and therefore, the frequency offset estimation module 104 performs frequency offset estimation on the second signal, and the obtained frequency offset estimation value is more accurate.
In one embodiment, the communication signal may include a long training code field and the frequency bandwidth of the second filter 103 may be matched to the frequency bandwidth of the long training code field.
It is understood that the communication Signal may be based on a packet format specified in the IEEE 802.11 wireless standard, and includes a preamble (which may be divided into three parts, namely, a short Training Field (stf), a Long Training Field (LTF), and a Signal Field (SIG), and the frequency offset estimation module 104 uses the Long Training Field (LTF) to perform the CFO carrier frequency offset estimation, specifically, uses the autocorrelation of the LTF long Training Field in the time domain to perform the frequency offset estimation, so that the frequency bandwidth of the second filter 103 may be set to match the frequency bandwidth of the long Training Field, thereby improving the accuracy of the frequency offset estimation.
In one embodiment, the first filter 102 may be a high order linear phase filter and the second filter 103 may be a low order nonlinear phase filter.
It can be understood that the high order linear phase filter can meet the requirement of high signal to noise ratio of the signal processing terminal 106, so that the signal to noise ratio of the processed communication signal is higher, and the signal to noise ratio requirement of the signal processing terminal 106 is better met, when frequency offset estimation is performed through the autocorrelation of the LTF long training code in the time domain, because the autocorrelation of the LTF long training code in the time domain has lower requirement on the phase linearity of the filter, and considering that the frequency bandwidth needs to be matched with the long training code field, the second signal can be obtained by processing the low order nonlinear phase filter, so that frequency offset estimation is performed on the second signal, and finally the precision of frequency offset compensation is higher, and is closer to the communication signal sent by the sending end, and carrier synchronization is realized. And the price of the low-order nonlinear phase filter is lower than that of the high-order linear phase filter, and the cost can be saved by adopting the low-order nonlinear phase filter.
In one embodiment, the communication signal includes a data frame field, and the frequency bandwidth of the first filter 102 matches the frequency bandwidth of the data frame field.
It can be understood that the communication signal based on the packet format specified in the IEEE 802.11 wireless standard further includes a data frame field, and the first filter 102 with the frequency bandwidth matching the frequency bandwidth of the data frame field is used to perform filtering processing on the communication signal, so that the integrity of the data frame field is ensured and the communication signal is not lost due to the processing of the first filter 102.
In one embodiment, the step of receiving a communication signal further comprises receiving a radio frequency signal communication signal, and converting the radio frequency signal into an electrical signal as the communication signal, and transmitting the communication signal to the first filter 102 and the second filter 103 respectively.
In one embodiment, after the radio frequency signal is converted into the electrical signal as the communication signal, the signal receiving method further includes converting the communication signal from an analog signal into a digital signal.
In one embodiment, after performing the frequency offset compensation on the first signal according to the frequency offset estimation value, the signal receiving method further includes converting the first signal from the time domain to the frequency domain and transmitting the converted first signal to the signal processing terminal 106.
It can be understood that, when the communication signal is subjected to multi-carrier modulation, the frequency offset compensated communication signal needs to be converted from the time domain to the frequency domain for further transmission to the signal processing terminal 106 for data demodulation.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A signal receiving apparatus, comprising:
a receiving module for receiving a communication signal;
the first filter is connected with the receiving module and used for filtering the communication signal to obtain a first signal;
the second filter is connected with the receiving module and used for filtering the communication signal to obtain a second signal, wherein the frequency bandwidth of the second filter is lower than that of the first filter;
the frequency offset estimation module is connected with the second filter and used for obtaining a frequency offset estimation value according to the second signal;
and the frequency offset compensation module is respectively connected with the first filter, the frequency offset estimation module and the signal processing terminal, and is used for performing frequency offset compensation on the first signal according to the frequency offset estimation value and transmitting the first signal to the signal processing terminal.
2. The signal receiving apparatus of claim 1, wherein the communication signal includes a long training code field, and wherein a frequency bandwidth of the second filter matches a frequency bandwidth of the long training code field.
3. The signal receiving apparatus of claim 2, wherein the first filter is a higher order linear phase filter and the second filter is a lower order nonlinear phase filter.
4. The signal receiving apparatus of claim 1, wherein the communication signal comprises a data frame field, and wherein a frequency bandwidth of the first filter matches a frequency bandwidth of the data frame field.
5. The signal receiving apparatus of claim 1, wherein the receiving module comprises:
an antenna for receiving a radio frequency signal;
and the radio frequency circuit is respectively connected with the antenna, the first filter and the second filter, and is used for converting a radio frequency signal into an electric signal to serve as the communication signal and respectively transmitting the electric signal to the first filter and the second filter.
6. The signal receiving apparatus according to claim 5, characterized in that the signal receiving apparatus further comprises:
and the analog-to-digital conversion module is respectively connected with the radio frequency circuit, the first filter and the second filter, and is used for converting the communication signal from an analog signal to a digital signal and respectively transmitting the digital signal to the first filter and the second filter.
7. The signal receiving apparatus according to claim 1, characterized in that the signal receiving apparatus further comprises:
and the Fourier transformer is respectively connected with the frequency offset compensation module and the signal processing terminal and is used for converting the first signal from a time domain to a frequency domain and transmitting the first signal to the signal processing terminal.
8. The signal receiving apparatus of claim 1, wherein the frequency offset compensation module is a mixer.
9. A communication system, comprising:
a signal processing terminal; and
the signal receiving device of any one of claims 1 to 7.
10. A signal receiving method, comprising:
receiving a communication signal;
filtering the communication signal by using a first filter to obtain a first signal, wherein the first filter is a high-order filter;
filtering the communication signal by using a second filter to obtain a second signal, wherein the frequency bandwidth of the second filter is lower than that of the first filter;
and obtaining a frequency offset estimation value according to the second signal, and performing frequency offset compensation on the first signal according to the frequency offset estimation value.
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| CN101453437A (en) * | 2007-12-07 | 2009-06-10 | 联发科技股份有限公司 | Frequency offset estimation method, automatic frequency control method and signal transceiver |
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