CN111181580A - Communication receiving apparatus and signal processing method thereof - Google Patents
Communication receiving apparatus and signal processing method thereof Download PDFInfo
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- CN111181580A CN111181580A CN201811343211.XA CN201811343211A CN111181580A CN 111181580 A CN111181580 A CN 111181580A CN 201811343211 A CN201811343211 A CN 201811343211A CN 111181580 A CN111181580 A CN 111181580A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
- H04B2001/1045—Adjacent-channel interference
Abstract
The invention provides a communication receiving device and a signal processing method thereof, wherein the communication receiving device comprises a frequency spectrum generating circuit, a signal-to-noise ratio estimating circuit and an adjacent channel interference detecting circuit. The spectrum generating circuit is used for generating a spectrum for a received signal. The frequency spectrum includes a data band, a first guard band on one side of the data band, and a second guard band on the other side of the data band. The signal-to-noise ratio estimation circuit is used for estimating a first signal-to-noise ratio of the data frequency band relative to the first guard frequency band and estimating a second signal-to-noise ratio of the data frequency band relative to the second guard frequency band. The adjacent channel interference detection circuit is used to determine whether there is adjacent channel interference in the received signal according to the first signal-to-noise ratio and the second signal-to-noise ratio.
Description
Technical Field
The present invention relates to a communication system, and more particularly, to an adjacent-channel interference (ACI) detection technique that can be employed by a receiving end of the communication system.
Background
In recent years, various wired and wireless communication technologies have been developed. Ensuring that the communication signal is not disturbed during the transmission is a major concern. Common external interference includes glitch, common channel interference, and adjacent channel interference. Adjacent channel interference refers to the situation where signal energy in adjacent frequency bands undesirably penetrates into a specific frequency band, and is usually due to the existence of signals with frequencies too close to each other in adjacent space. In practice, if the influence of the adjacent channel interference is not eliminated, the receiving end may not be able to correctly decode the content of the received signal. Various techniques exist for canceling adjacent channel interference. However, if there is no adjacent channel interference, the adjacent channel interference cancellation procedure applied to the received signal will have adverse effects, so that the quality of the received signal will be degraded. Therefore, how to detect whether the adjacent channel interference exists is a considerable problem.
Disclosure of Invention
The invention provides a novel communication receiving device and a signal processing method thereof, which are used for detecting whether adjacent channel interference exists.
An embodiment of the invention is a communication receiving apparatus, which includes a spectrum generating circuit, a signal-to-noise ratio estimating circuit, and an adjacent channel interference detecting circuit. The spectrum generating circuit is used for generating a spectrum for a received signal. The spectrum includes a data band, a first guard band on one side of the data band, and a second guard band on the other side of the data band. The signal-to-noise ratio estimation circuit is used for estimating a first signal-to-noise ratio of the data frequency band relative to the first guard frequency band and estimating a second signal-to-noise ratio of the data frequency band relative to the second guard frequency band. The adjacent channel interference detection circuit is used to determine whether there is an adjacent channel interference in the received signal according to the first SNR and the second SNR.
Another embodiment of the present invention is a signal processing method applied to a communication receiving apparatus. First, a spectrum associated with a received signal is generated, wherein the spectrum includes a data band, a first guard band on one side of the data band, and a second guard band on the other side of the data band. Then, a first signal-to-noise ratio of the data band relative to the first guard band is estimated, and a second signal-to-noise ratio of the data band relative to the second guard band is also estimated. Then, according to the first SNR and the second SNR, whether there is an adjacent channel interference in the received signal is determined.
The features, operation and efficacy of the present invention will be described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a functional block diagram of a communication receiving device according to an embodiment of the present invention;
FIG. 2 shows an exemplary frequency spectrum in one embodiment of the present invention;
FIG. 3 is a schematic flow chart of FIG. 2 after step S162;
FIGS. 4A-4C illustrate exemplary spectrums for illustrating the in-band inspection range and the out-of-band inspection range according to the present invention in an embodiment of the present invention;
FIG. 5 is a functional block diagram of a computing circuit according to an embodiment of the present invention;
FIG. 6 is a functional block diagram of a smoothing loop filter according to an embodiment of the present invention; and
fig. 7 shows a flowchart of a signal processing method of a communication receiving apparatus in an embodiment of the invention.
It is noted that the drawings include functional block diagrams that represent various functional blocks that can be associated with one another. These drawings are not detailed circuit diagrams, and the connecting lines are only used to indicate signal flows. The various interactions between functional elements and/or processes need not be achieved through direct electrical connections. In addition, the functions of the individual elements do not have to be distributed as shown in the drawings, and the distributed blocks do not have to be implemented by distributed electronic elements.
Description of the symbols
100 communication receiver
110 automatic gain control circuit
120 frequency spectrum generating circuit
130 channel estimation circuit
140 equalization circuit
150 demapping/decoding circuit
160 signal-to-noise ratio estimation circuit
161 frequency band selection circuit
162 peak value selecting circuit
163 computing circuit
163A-163D smoothing loop filter
163E ratio calculation circuit
163A1 multiplier
163A2 adder
163A3 delay circuit
163A4 multiplier
170 adjacent channel interference detection circuit
410 rising edge of energy
420 falling edge of energy
BDATAData frequency band
BGUARD_1First guard band
BGUARD_2Second guard band
BINIn-band inspection range
BIN_1First in-band viewing range
BIN_2Second in-band viewing range
BOUT_1First out-of-band viewing range
BOUT_2Second out-of-band viewing range
PINPeak value of in-band energy
PIN_1、PIN_1_iFirst in-band energy peak
PIN_2、PIN_2_iSecond in-band energy peak
PIN_1_addPeak in band energy after first addition
PIN_2_addSecond post-addition in-band energy peak
POUT_1、POUT_1_iFirst out-of-band energy peak
POUT_2、POUT_2_iSecond out-of-band energy peak
POUT_1_addFirst added out-of-band energy peak
POUT_2_addSecond added out-of-band energy peak
S701-S706 flow steps
S frequency spectrum
SNR_1First signal to noise ratio
SNR_2Second signal to noise ratio
Y received signal
Y' output signal
Z control signal
α smoothing parameter
Detailed Description
An embodiment of the invention is a communication receiving apparatus, which includes a spectrum generating circuit, a signal-to-noise ratio estimating circuit, and an adjacent channel interference detecting circuit. The following mainly uses a signal processing architecture of a receiving end of an Orthogonal Frequency Division Multiplexing (OFDM) system as an example to describe how to apply the above-mentioned circuits to implement the concept of the present invention. Please refer to fig. 1. The communication receiver 100 includes an automatic gain control circuit 110, a spectrum generating circuit 120, a channel estimation circuit 130, an equalization circuit 140, a demapping/decoding circuit 150, a signal-to-noise ratio estimation circuit 160, and an adjacent channel interference detection circuit 170. Although not shown in fig. 1, the communication receiving apparatus 100 may further include other elements such as a tuner (tuner), a down-conversion circuit, and an analog-digital conversion circuit.
The agc circuit 110 is responsible for applying an agc procedure to the received signal Y to adjust its amplitude to a magnitude suitable for subsequent circuit processing. Next, the spectrum generating circuit 120 is responsible for generating a spectrum S for the output signal Y' of the agc circuit 110. The channel estimation circuit 130 is used to generate a channel impulse response estimation value according to the spectrum S
Which is provided to the equalization circuit 140. Then, the equalized signal generated by the equalization circuit 140
Is sent to the demapping/decoding circuit 150 for subsequent processing.
In the embodiment shown in fig. 1, the adjacent channel interference detecting circuit 170 informs the agc circuit 110 of the detection result through a control signal Z, and the agc circuit 110 selectively adjusts the gain applied to the received signal Y according to whether the adjacent channel interference exists in the received signal Y. For example, when the control signal Z indicates that the received signal Y has the adjacent channel interference, the agc circuit 110 may appropriately reduce the gain applied to the received signal Y to prevent the abnormal amplitude caused by the adjacent channel interference in the signal Y' from exceeding the dynamic range of the input signal of the equalizer circuit 140. How the adjacent channel interference detecting circuit 170 determines whether or not adjacent channel interference exists in the received signal Y will be described below.
As shown in fig. 1, the spectrum S output from the spectrum generating circuit 120 is also transmitted to the snr estimation circuit 160. FIG. 2 shows an example of a spectrum S comprising a data band BDATAAnd two guard bands (guard bands) B on both sidesGUARD_1、BGUARD_2. More specifically, data band BDATAThe frequency band in which the desired data exists in the communication receiving apparatus 100 is called a guard band BGUARDRefers to data band BDATAIs not the frequency band used to transmit the desired data. In practice, data band BDATAAnd guard band BGUARD_1、BGUARD_2The range of (a) may be clearly defined in the specification and known to the communication reception apparatus 100 in advance, or may be known from the communication reception apparatus 100 by analyzing the spectrum S. It should be noted that the SNR estimation circuit 160 obtains the data band BDATAAnd guard band BGUARDThe technical details of the frequency range are known to those skilled in the art, and are not described herein.
The SNR estimation circuit 160 is responsible for estimating the data band BDATAWith respect to the first guard band BGUARD_1Signal-to-noise ratio (hereinafter referred to as first signal-to-noise ratio SNR)_1) And estimate the data band BDATAWith respect to the second guard band BGUARD_2Signal-to-noise ratio (hereinafter referred to as second signal-to-noise ratio SNR)_2). As shown in fig. 3, the snr estimation circuit 160 may be designed to include a band selection circuit 161, a peak selection circuit 162, and a calculation circuit 163. In one embodiment, the band selection circuit 161 is used for the first guard band BGUARD_1A first out-of-band inspection range B is selectedOUT_1In the second guard band BGUARD_2Selecting a second out-of-band inspection range BOUT_2And in the data band BDATASelecting an in-band inspection range BIN. For example, as shown in FIG. 4A, the band selection circuit 161 can be designed to directly use the data band BDATAAs the in-band inspection range BINAnd the first guard band BGUARD_1Is regarded as the first out-of-band inspection range BOUT_1The second guard band BGUARD_2Regarded as the second out-of-band inspection range BOUT_2。
In another embodiment, as shown in FIG. 4B, the band selection circuit 161 can be designed to identify the data band B in the spectrum S according to the trend of the energy variationDATAA rising edge (rising edge) and a falling edge (falling edge), and excluding the rising edge or falling edge from the in-band viewing range BINAnd an outside viewing range BOUT_1、BOUT_2And (c) out. In the example presented in FIG. 4B, data band BDATAIs shown as dashed range 410 and its energy falling edge is shown as dashed range 420. As can be seen in FIG. 4B, the in-band viewing range BINAnd an outside viewing range BOUT_1、BOUT_2Neither of the energy rising edge nor the energy falling edge is included. In practical situations, the energy rising/falling edge may fall on the data band B in whole or in partDATAIn addition, it is possible to fall wholly or partially on guard band BGUARDAnd (4) the following steps. The reason for excluding the rising/falling energy is that the energy of the transition region is not suitable for representing the data band BDATAThe overall energy level ofTo represent the guard band BGUARDThe overall energy level.
The peak selecting circuit 162 is responsible for viewing the first out-of-band viewing range BOUT_1A first out-of-band energy peak value P is selectedOUT_1In the second out-of-band viewing range BOUT_2A second out-of-band energy peak value P is selectedOUT_2And in-band viewing range BINIn which an in-band energy peak P is selectedINThat is, the highest energy value in each of the three inspection ranges is selected, as indicated in FIG. 4B.
Subsequently, the calculation circuit 163 may be based on the in-band energy peak PINWith a first out-of-band energy peak POUT_1Estimating a first signal-to-noise ratio (SNR)_1And according to the in-band energy peak PINAnd a second out-of-band energy peak POUT_2Estimating a second signal-to-noise ratio (SNR)_2. For example, the calculation circuit 163 may employ the following operation:
then, the adjacent channel interference detection circuit 170 will detect the first SNR provided by the SNR estimation circuit 160_1SNR with a second signal to noise ratio_2And judging whether the adjacent channel interference exists in the received signal Y. Specifically, the adjacent channel interference means guard band BGUARD_1Or BGUARD_2In which abnormal energy that is not in expectation occurs. Thus, if there is no adjacent channel interference, the first SNR_1SNR with a second signal to noise ratio_2The absolute value difference of (d) (hereinafter denoted by the symbol diff) is usually small. On the other hand, if there is adjacent channel interference, the SNR is_1、SNR_2There is a considerable gap; the stronger the adjacent channel interference, the greater the difference diff.
In one embodiment, the adjacent channel interference detecting circuit 170 compares whether the difference diff is higher than a predetermined threshold; when the absolute value of the difference diff is higher than the predetermined threshold, it is determined that the adjacent channel interference exists in the received signal Y. In practice, the predetermined threshold is not limited to a specific value. For example, the predetermined threshold value may be determined according to the tolerance of the demapping/decoding circuit 150 for the amount of distortion. As mentioned above, the larger the difference diff is, the stronger the adjacent channel interference is, the greater the probability that the signal Y' output by the agc circuit 110 contains distortion signal is. For many decoders with error correction, when the occurrence probability of distorted signals is higher than a certain value, the decoding may fail. On the other hand, when the occurrence probability of the distortion signal is lower than the specific value, the decoder can correct the error and decode correctly even if the distortion signal exists. The circuit designer may perform experiments or simulations in advance to count how high the difference diff is, which may cause the number of distorted signals to be excessive and affect the success rate of the decoder, and accordingly determine the predetermined threshold. If the control signal Z indicates that the difference diff is below the predetermined threshold, the agc circuit 110 does not need to adjust the gain applied to the received signal Y. On the other hand, if the difference diff is higher than the predetermined threshold, the agc circuit 110 may properly adjust the gain, so as to avoid the decoding failure of the demapping/decoding circuit 150 due to excessive abnormal amplitude passing through the agc circuit 110 and exceeding the dynamic range of the input signal of the equalizer circuit 140.
It is noted that the first SNR_1SNR with a second signal to noise ratio_2Is not limited to the above mechanism. For example, as shown in FIG. 4C, the band selection circuit 161 may be in the data band BDATAIn the first out-of-band inspection range BOUT_1A first in-band inspection range BIN_1And in the data band BDATAIn the second out-of-band inspection range BOUT_2A second in-band inspection range BIN_2. The two in-band inspection ranges BIN_1、BIN_2Are all smaller than the data band BDATAAnd do not overlap each other. The peak value selecting circuit 162 inspects the range B in the first bandIN_1In which a first in-band energy peak P is selectedIN_1And viewing the range B in the second zoneIN_2Selecting a second in-band energy peak PIN_2. In this embodiment, electricity is calculatedThe path 163 is based on the first in-band energy peak PIN_1With a first out-of-band energy peak POUT_1Estimating a first signal-to-noise ratio (SNR)_1And according to the second in-band energy peak PIN_2And a second out-of-band energy peak POUT_2Estimating a second signal-to-noise ratio (SNR)_2For example, the following operational formula is used:
it should be noted that the adjacent channel interference detection circuit 170 is based on the first SNR_1SNR with a second signal to noise ratio_2Judging whether the adjacent channel interference exists or not according to the difference; in practice, the SNR estimation circuit 160 does not need to provide an absolutely accurate and fine SNR_1SNR with a second signal to noise ratio_2. With respect to viewing the entire data band BDATAThe advantage of selecting two smaller in-band inspection ranges is that the peak selection circuit 162 can inspect less data when selecting the in-band energy peak, and therefore is more efficient and generally sufficient to yield a signal-to-noise ratio SNR that allows the adjacent channel interference detection circuit 170 to make a correct determination_1SNR with a second signal to noise ratio_2。
On the other hand, if the received signal Y conforms to the Orthogonal Frequency Division Multiplexing (OFDM) specification, the spectrum generating circuit 120 can generate a spectrum S for each of N symbols (symbols) in the received signal Yi(N is an integer greater than one, and the integer index i is 1-N), and the SNR estimation circuit 160 estimates the SNR_1SNR with a second signal to noise ratio_2The N spectra may be taken into account. The band selection circuit 161 is used to select the data band BDATATake the case of two in-band inspection ranges as an example. The peak selection circuit 162 provides four peaks (the first in-band energy peak P) for each analyzed spectrumIN_1_iFirst out-of-band energy peak POUT_1_iSecond in-band energy peak PIN_2_iSecond out-of-band energy peak POUT_2_i) To the calculation circuit 163. FIG. 5 presents one of the calculation circuits 163In detail, the exemplary embodiment includes four smoothing loop filters (smoothing loop filters) 163A to 163D and a ratio calculating circuit 163E.
the first smoothing loop filter 163A is used to receive the N first in-band energy peaks P in sequence according to a smoothing parameter αIN_1Adding to generate a first post-addition in-band energy peak PIN_1_addFIG. 6 shows a detailed implementation example of the first smoothing loop filter 163A. the smoothing parameter α can be selected by the circuit designer based on practical experience, for example, set to a value of 0.5 or 0.25IN_1Are sequentially fed to a first smoothing loop filter 163A. The multiplier 163A1 is responsible for dividing the ith peak P thereinIN_1_ithe smoothing parameter α is multiplied by the input signal of the adder 163A2, the other input signal of the adder 163A2 is P through the action of the delay circuit 163A3 and the multiplier 163A4IN_add_(i-1)product of the N first in-band energy peaks PIN_1Are sequentially added to obtain energy PIN_1_add_NI.e. the first post-addition in-band energy peak value PIN_1_add。
Similarly, the second smoothing loop filter 163B is used to combine the N second in-band energy peaks PIN_2Adding to produce a second post-addition in-band energy peak PIN_2_add(ii) a The third smoothing loop filter 163C is used to filter the N first out-of-band energy peaks POUT_1Adding to generate a first added out-of-band energy peak POUT_1_add(ii) a The fourth smoothing loop filter 163D is used to filter the N second out-of-band energy peaks POUT_2Adding to generate a second added out-of-band energy peak POUT_2_add。
The ratio calculation circuit 163E is then responsible for calculating the first post-addition in-band energy peak PIN_1_addOut-of-band energy peak P after first additionOUT_1_addAs the first signal-to-noise ratio SNR_1：
And calculating the second post-addition in-band energy peak PIN_2_addOut-of-band energy peak P after second additionOUT_2_addAs a second signal-to-noise ratio SNR_2：
The benefit of taking multiple symbols into account is that a larger time frame can be observed, avoiding short term disturbances in the communication environment affecting the signal-to-noise ratio SNR_1SNR with a second signal to noise ratio_2Overall correctness of.
In practice, the SNR estimation circuit 160 and the adjacent channel interference detection circuit 170 can be implemented as fixed and/or programmable digital logic circuits, including programmable logic gate arrays, application specific integrated circuits, microcontrollers, microprocessors, digital signal processors, and other necessary circuits. Those skilled in the art will appreciate that there are numerous circuit configurations and components which can implement the concepts of the present invention without departing from the spirit of the invention.
It should be noted that the control signal Z generated by the adjacent channel interference detecting circuit 170 may also be used as a reference value for setting various system parameters, and is not limited to determining whether the gain of the agc circuit 110 should be adjusted.
Another embodiment of a signal processing method applied to a communication receiving apparatus according to the present invention is illustrated in fig. 7. First, in step S701, a spectrum is generated for a received signal, wherein the spectrum includes a data band, a first guard band located at one side of the data band, and a second guard band located at the other side of the data band. Then, in step S702, a first snr of the data band with respect to the first guard band is estimated. In step S703, a second snr of the data band relative to the second guard band is estimated. Step S704 is to determine whether there is an adjacent channel interference in the received signal according to the first snr and the second snr.
As one of ordinary skill in the art will appreciate, the order of some steps in FIG. 7 can be changed or performed simultaneously without affecting the overall performance of the signal processing method. In addition, various operation changes described in the introduction of the communication receiving apparatus 100 can also be applied to the signal processing method shown in fig. 7, and details thereof are not repeated.
The foregoing detailed description of the embodiments is intended to more clearly illustrate the features and spirit of the invention, and not to limit the scope of the invention by the embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the claims.
Claims (12)
1. A communication receiving apparatus, comprising:
a spectrum generating circuit, for generating a spectrum for a received signal, wherein the spectrum includes a data band, a first guard band located at one side of the data band, and a second guard band located at the other side of the data band;
a signal-to-noise ratio estimation circuit for estimating a first signal-to-noise ratio of the data band relative to the first guard band and estimating a second signal-to-noise ratio of the data band relative to the second guard band; and an adjacent channel interference detection circuit for determining whether an adjacent channel interference exists in the received signal according to the first signal-to-noise ratio and the second signal-to-noise ratio.
2. The communication receiver of claim 1, wherein the snr estimation circuit comprises:
a band selection circuit for selecting an in-band inspection range from the data band, selecting a first out-of-band inspection range from the first guard band, and selecting a second out-of-band inspection range from the second guard band;
a peak value selecting circuit, for selecting an in-band energy peak value in the in-band inspection range, selecting a first out-of-band energy peak value in the first out-of-band inspection range, and selecting a second out-of-band energy peak value in the second out-of-band inspection range; and
a calculating circuit for estimating the first SNR according to the in-band energy peak and the first out-of-band energy peak, and estimating the second SNR according to the in-band energy peak and the second out-of-band energy peak.
3. The communication receiver of claim 1, wherein the snr estimation circuit comprises:
a band selection circuit for selecting a first in-band viewing range adjacent to the first out-of-band viewing range from the data band, selecting a second in-band viewing range adjacent to the second out-of-band viewing range from the data band, selecting a first out-of-band viewing range from the first guard band, and selecting a second out-of-band viewing range from the second guard band;
a peak value selecting circuit, for selecting a first in-band energy peak value in the first in-band viewing range, selecting a second in-band energy peak value in the second in-band viewing range, selecting a first out-of-band energy peak value in the first out-of-band viewing range, and selecting a second out-of-band energy peak value in the second out-of-band viewing range; and
a calculating circuit for estimating the first SNR according to the first in-band energy peak and the first out-of-band energy peak, and estimating the second SNR according to the second in-band energy peak and the second out-of-band energy peak.
4. The communication receiver of claim 1, wherein the SNR estimation circuit identifies a rising energy edge between the data band and the first guard band, identifies a falling energy edge between the data band and the second guard band, and excludes energy contained by the rising energy edge and the falling energy edge when estimating the first SNR and the second SNR.
5. The communication receiver of claim 1, wherein the received signal conforms to an orthogonal frequency division multiplexing specification, the spectrum generator circuit generating a spectrum for each of N symbols in the received signal, where N is an integer greater than one; the SNR estimation circuit takes into account the N spectra when estimating the first and second SNR.
6. The communication receiver of claim 5, wherein the SNR estimation circuit comprises:
a band selection circuit for selecting a first out-of-band inspection range in the first guard band and a second out-of-band inspection range in the second guard band for each of the N frequency spectrums;
a peak selection circuit for selecting a first out-of-band energy peak in the first out-of-band viewing range and a second out-of-band energy peak in the second out-of-band viewing range for each of the N frequency spectra;
a first smoothing loop filter for summing the N first out-of-band energy peaks according to a smoothing parameter, thereby generating a first added out-of-band peak;
a second smoothing loop filter for summing the N second out-of-band energy peaks according to the smoothing parameter to thereby generate a second added out-of-band peak; and
a calculating circuit for estimating the first SNR according to the first added out-of-band peak and for estimating the second SNR according to the second added out-of-band peak.
7. A signal processing method applied to a communication receiving apparatus, comprising:
(a) generating a frequency spectrum for a received signal, wherein the frequency spectrum comprises a data band, a first guard band located at one side of the data band, and a second guard band located at the other side of the data band;
(b) estimating a first signal-to-noise ratio of the data band relative to the first guard band, and estimating a second signal-to-noise ratio of the data band relative to the second guard band; and
(c) determining whether there is an adjacent channel interference in the received signal according to the first SNR and the second SNR.
8. The signal processing method of claim 7, wherein step (b) comprises:
selecting an in-band inspection range from the data frequency band, selecting a first out-of-band inspection range from the first guard band, and selecting a second out-of-band inspection range from the second guard band;
selecting an in-band energy peak value in the in-band inspection range, selecting a first out-of-band energy peak value in the first out-of-band inspection range, and selecting a second out-of-band energy peak value in the second out-of-band inspection range; and
estimating the first SNR according to the in-band energy peak and the first out-of-band energy peak, and estimating the second SNR according to the in-band energy peak and the second out-of-band energy peak.
9. The signal processing method of claim 7, wherein step (b) comprises:
selecting a first in-band inspection range adjacent to the first out-of-band inspection range from the data band, selecting a second in-band inspection range adjacent to the second out-of-band inspection range from the data band, selecting a first out-of-band inspection range from the first guard band, and selecting a second out-of-band inspection range from the second guard band;
selecting a first in-band energy peak value in the first in-band inspection range, a second in-band energy peak value in the second in-band inspection range, a first out-of-band energy peak value in the first out-of-band inspection range, and a second out-of-band energy peak value in the second out-of-band inspection range; and
estimating the first SNR according to the first in-band energy peak and the first out-of-band energy peak, and estimating the second SNR according to the second in-band energy peak and the second out-of-band energy peak.
10. The signal processing method of claim 7, wherein step (b) comprises:
identifying an energy rising edge between the data band and the first guard band in the spectrum;
identifying an energy falling edge between the data band and the second guard band; and
and eliminating energy contained in the energy rising edge and the energy falling edge when estimating the first signal-to-noise ratio and the second signal-to-noise ratio.
11. The method of claim 7 wherein the received signal complies with an orthogonal frequency division multiplexing specification; the signal processing method comprises the following steps:
generating a frequency spectrum for each of N symbols in the received signal, wherein N is an integer greater than one; and
the N spectra are taken into account when estimating the first SNR and the second SNR.
12. The signal processing method of claim 11, wherein step (b) comprises:
selecting a first out-of-band inspection range in the first guard band and a second out-of-band inspection range in the second guard band for each of the N frequency spectrums;
selecting a first out-of-band energy peak in the first out-of-band viewing range and a second out-of-band energy peak in the second out-of-band viewing range for each of the N spectra;
adding the N first out-of-band energy peaks according to a smoothing parameter, thereby generating a first added out-of-band peak;
adding the N second out-of-band energy peaks according to the smoothing parameter, thereby generating a second added out-of-band peak; and
estimating the first SNR from the first added out-of-band peak and estimating the second SNR from the second added out-of-band peak.
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