TW202019105A - Communication receiving apparatus and signal processing method thereof - Google Patents

Abstract

A communication receiving apparatus including a spectrum generating circuit, a signal-to-noise (SNR) ratio estimating circuit, and an adjacent-channel interference (ACI) detecting circuit is provided. The spectrum generating circuit generates a spectrum for a received signal. The spectrum includes a data band, a first guard band at one side of the data band, and a second guard band at the other side of the data band. The SNR ratio estimating circuit estimates two ratios. The first one is the SNR of the data band in contrast to the first guard band; the second one is the SNR of the data band in contrast to the second guard band. Based on the first SNR and second SNR, the ACI detecting circuit determines whether there is ACI in the received signal.

Description

通訊接收裝置及其信號處理方法Communication receiving device and its signal processing method

本發明與通訊系統相關，並且尤其與通訊系統之接收端能採用的鄰頻干擾（adjacent-channel interference, ACI）偵測技術相關。The invention relates to a communication system, and particularly relates to an adjacent-channel interference (ACI) detection technology that can be used at the receiving end of the communication system.

近年來，各種有線及無線的通訊技術皆蓬勃發展。確保通訊信號在傳遞過程中不受到干擾是備受關注的議題。常見的外部干擾包含突波干擾、共同頻道干擾，以及鄰頻干擾。所謂鄰頻干擾是指鄰近頻段之信號能量非預期地滲入一特定頻段的情況，其成因通常為鄰近空間中存在頻率過於相近的信號。實務上，若未消除鄰頻干擾的影響，接收端有可能無法正確解讀接收信號的內容。目前已存在多種消除鄰頻干擾的技術。然而，若是在沒有鄰頻干擾的情況下，對接收信號施以鄰頻干擾消除程序會帶來反效果，使得接收信號的品質下降。因此，如何偵測鄰頻干擾是否存在是值得重視的問題。In recent years, various wired and wireless communication technologies have flourished. Ensuring that communication signals are not disturbed during transmission is a topic of great concern. Common external interference includes glitch interference, common channel interference, and adjacent channel interference. The so-called adjacent frequency interference refers to the situation where the signal energy of the adjacent frequency band unintentionally penetrates into a specific frequency band. The cause is usually that there are signals in the adjacent space whose frequencies are too close. In practice, if the influence of adjacent channel interference is not eliminated, the receiving end may not be able to correctly interpret the content of the received signal. At present, there are various techniques for eliminating adjacent-channel interference. However, if there is no adjacent-channel interference, applying the adjacent-channel interference cancellation procedure to the received signal will have a negative effect, resulting in a decrease in the quality of the received signal. Therefore, how to detect the existence of adjacent frequency interference is a problem that deserves attention.

本發明提出一種新的通訊接收裝置及其信號處理方法，用以偵測鄰頻干擾是否存在。The present invention proposes a new communication receiving device and its signal processing method for detecting the presence of adjacent-frequency interference.

根據本發明之一實施例為一種通訊接收裝置，其中包含一頻譜產生電路、一信號雜訊比估計電路，以及一鄰頻干擾偵測電路。該頻譜產生電路係用以針對一接收信號產生一頻譜。該頻譜包含一資料頻帶、位於該資料頻帶一側之一第一防護頻帶，以及位於該資料頻帶另一側之一第二防護頻帶。該信號雜訊比估計電路係用以估計該資料頻帶相對於該第一防護頻帶之一第一信號雜訊比，並估計該資料頻帶相對於該第二防護頻帶之一第二信號雜訊比。該鄰頻干擾偵測電路係用以根據該第一信號雜訊比與該第二信號雜訊比判斷該接收信號中是否存在一鄰頻干擾。According to an embodiment of the present invention, a communication receiving device includes a spectrum generating circuit, a signal-to-noise ratio estimation circuit, and an adjacent-frequency interference detection circuit. The frequency spectrum generating circuit is used to generate a frequency 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 to estimate a first signal-to-noise ratio of the data band relative to the first guard band, and estimate a second signal-to-noise ratio of the data band relative to the second guard band . The adjacent channel interference detection circuit is used to determine whether there is a adjacent channel interference in the received signal according to the first signal to noise ratio and the second signal to noise ratio.

根據本發明之另一實施例為一種應用於一通訊接收裝置之信號處理方法。首先，與一接收信號相關之一頻譜被產生，其中該頻譜包含一資料頻帶、位於該資料頻帶一側之一第一防護頻帶，以及位於該資料頻帶另一側之一第二防護頻帶。其次，該資料頻帶相對於該第一防護頻帶之一第一信號雜訊比被估計，且該資料頻帶相對於該第二防護頻帶之一第二信號雜訊比亦被估計。隨後，根據該第一信號雜訊比與該第二信號雜訊比，該接收信號中是否存在一鄰頻干擾被判斷。Another embodiment according to the present invention is a signal processing method applied to a communication receiving device. First, a frequency spectrum related to a received signal is generated, where 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. Second, the first signal-to-noise ratio of the data band relative to the first guard band is estimated, and the second signal-to-noise ratio of the data band relative to the second guard band is also estimated. Then, according to the first signal-to-noise ratio and the second signal-to-noise ratio, it is determined whether there is an adjacent channel interference in the received signal.

有關本發明的特徵、實作與功效，茲配合圖式作較佳實施例詳細說明如下。Regarding the features, implementation and efficacy of the present invention, the preferred embodiments in conjunction with the drawings are described in detail below.

根據本發明之一實施例為一種通訊接收裝置，其中包含一頻譜產生電路、一信號雜訊比估計電路，以及一鄰頻干擾偵測電路。以下主要採用一正交分頻多工（orthogonal frequency-division multiplexing, OFDM）系統之接收端的信號處理架構做為範例，說明如何應用上述電路實現本發明的概念。請參閱圖1。通訊接收裝置100包含一自動增益控制電路110、一頻譜產生電路120、一通道估計電路130、一等化電路140、一解映射/解碼電路150、一信號雜訊比估計電路160，以及一鄰頻干擾偵測電路170。須說明的是，雖未繪示於圖1中，通訊接收裝置100還可包含例如調諧器（tuner）、降頻轉換電路、類比-數位轉換電路等其他元件。According to an embodiment of the present invention, a communication receiving device includes a spectrum generating circuit, a signal-to-noise ratio estimation circuit, and an adjacent-frequency interference detection circuit. The following mainly uses the signal processing architecture of the receiving end of an orthogonal frequency-division multiplexing (OFDM) system as an example to illustrate how to apply the above-mentioned circuit to realize the concept of the present invention. Please refer to Figure 1. The communication receiving device 100 includes an automatic gain control circuit 110, a spectrum generation 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 a neighbor Frequency interference detection circuit 170. It should be noted that although not shown in FIG. 1, the communication receiving device 100 may further include other elements such as a tuner, a down conversion circuit, an analog-to-digital conversion circuit, and the like.

自動增益控制電路110負責對接收信號Y 施以一自動增益控制程序，以將其振幅調整為適於後續電路處理的大小。接著，頻譜產生電路120負責為自動增益控制電路110的輸出信號Y’ 產生一頻譜S 。通道估計電路130係用以根據頻譜S 產生一通道脈衝響應估計值

，提供給等化電路140參考。接著，等化電路140產生的等化後信號

會被送往解映射/解碼電路150施以後續處理。The automatic gain control circuit 110 is responsible for applying an automatic gain control procedure to the received signal Y to adjust its amplitude to a size suitable for subsequent circuit processing. Next, the spectrum generating circuit 120 is responsible for generating a frequency spectrum S for the output signal Y′ of the automatic gain control circuit 110. The channel estimation circuit 130 is used to generate a channel impulse response estimation value according to the frequency spectrum S

, Provided to the equalization circuit 140 for reference. Next, the equalized signal generated by the equalization circuit 140

It will be sent to the demapping/decoding circuit 150 for subsequent processing.

在圖1呈現的實施例中，鄰頻干擾偵測電路170透過一控制信號Z 通知自動增益控制電路110其偵測結果，而自動增益控制電路110會根據接收信號Y 中是否存在鄰頻干擾，選擇性地調整施加於接收信號Y 的增益大小。舉例而言，當控制信號Z 指出接收信號Y 中存在鄰頻干擾時，自動增益控制電路110可適度降低施加於接收信號Y 的增益，以避免鄰頻干擾在信號Y’ 中造成的異常振幅超出等化電路140的輸入信號動態範圍。以下將說明鄰頻干擾偵測電路170如何判斷接收信號Y 中是否存在鄰頻干擾。In the embodiment shown in FIG. 1, the adjacent channel interference detection circuit 170 notifies the automatic gain control circuit 110 of the detection result through a control signal Z , and the automatic gain control circuit 110 will determine whether there is adjacent channel interference in the received signal Y , Selectively adjust the magnitude of the gain applied to the received signal Y. For example, when the control signal Z is noted that the presence of adjacent channel interference in the received signal Y, the automatic gain control circuit 110 may moderately reduce the gain applied to the received signal Y, in order to avoid adjacent channel interference caused by abnormality in the amplitude signal Y 'that exceeds The dynamic range of the input signal of the equalization circuit 140. The following will explain how the adjacent channel interference detection circuit 170 determines whether there is adjacent channel interference in the received signal Y.

如圖1所示，頻譜產生電路120輸出的頻譜S 也被傳送至信號雜訊比估計電路160。圖2呈現一頻譜S 的範例，其中包含一個資料頻帶B_DATA 以及位於兩側的兩個防護頻帶（guard band）B_{GUARD_1} 、B_{GUARD_2} 。更具體地說，資料頻帶B_DATA 係指對通訊接收裝置100來說存在所需資料的頻段，而所謂防護頻帶B_GUARD 係指資料頻帶B_DATA 之外並非用以傳輸所需資料的頻段。實務上，資料頻帶B_DATA 與防護頻帶B_{GUARD_1} 、B_{GUARD_2} 的範圍有時會被明訂於規格書中並且為通訊接收裝置100預先可知，有時則是會由通訊接收裝置100透過分析頻譜S 而得知。須說明的是，信號雜訊比估計電路160取得資料頻帶B_DATA 與防護頻帶B_GUARD 之頻率範圍的技術細節為本發明所屬技術領域中具有通常知識者所知，於此不贅述。As shown in FIG. 1, the spectrum S output by the spectrum generating circuit 120 is also transmitted to the signal-to-noise ratio estimation circuit 160. Figure 2 presents an example of a spectrum S , which includes a data band B _DATA and two guard bands B _{GUARD_1} and B _{GUARD_2} on both sides. More specifically, the data band B _DATA refers to a frequency band where required data exists for the communication receiving device 100, and the so-called guard band B _GUARD refers to a frequency band other than the data band B _DATA that is not used to transmit required data. In practice, the ranges of the data band B _DATA and the guard bands B _{GUARD_1} and B _{GUARD_2} are sometimes specified in the specification and known in advance for the communication receiving device 100, and sometimes the communication receiving device 100 analyzes the frequency spectrum S And learned. It should be noted that the technical details of the frequency range in which the signal-to-noise ratio estimation circuit 160 acquires the data band B _DATA and the guard band B _GUARD are known to those of ordinary skill in the technical field to which the present invention belongs, and will not be repeated here.

信號雜訊比估計電路160負責估計資料頻帶B_DATA 相對於第一防護頻帶B_{GUARD_1} 的信號雜訊比（以下稱第一信號雜訊比SNR_{_1} ），並且估計資料頻帶B_DATA 相對於第二防護頻帶B_{GUARD_2} 的信號雜訊比（以下稱第二信號雜訊比SNR_{_2} ）。如圖3所示，信號雜訊比估計電路160可被設計為包含一頻帶選取電路161、一峰值選取電路162，以及一計算電路163。於一實施例中，頻帶選取電路161係用以於第一防護頻帶B_{GUARD_1} 中選取一第一帶外檢視範圍B_{OUT_1} ，於該第二防護頻帶B_{GUARD_2} 中選取一第二帶外檢視範圍B_{OUT_2} ，並且於資料頻帶B_DATA 中選取一帶內檢視範圍B_IN 。舉例而言，如圖4A所示，頻帶選取電路161可被設計為直接採用資料頻帶B_DATA 做為帶內檢視範圍B_IN ，並將第一防護頻帶B_{GUARD_1} 視為第一帶外檢視範圍B_{OUT_1} 、將第二防護頻帶B_{GUARD_2} 視為第二帶外檢視範圍B_{OUT_2} 。The signal-to-noise ratio estimation circuit 160 is responsible for estimating the signal-to-noise ratio of the data band B _DATA relative to the first guard band B _{GUARD_1} (hereinafter referred to as the first signal-to-noise ratio SNR _{_1} ), and estimating the data band B _DATA relative to the second guard The signal-to-noise ratio of the frequency band B _{GUARD_2} (hereinafter referred to as the second signal-to-noise ratio SNR _{_2} ). As shown in FIG. 3, the signal-to-noise ratio 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 frequency band selection circuit 161 based on a first guard band B to select _{Guard l OUT_1} outer viewing range B with a first, outside the view area B select a second guard band in the second band _B GUARD_2 in _{OUT_2} , and select an in-band viewing range B _IN in the data band B _DATA . For example, as shown in FIG. 4A, the band selection circuit 161 may be designed to directly use the data band B _DATA as the in-band viewing range B _IN , and regard the first guard band B _{GUARD_1} as the first out-of-band viewing range B _{OUT_1} , the second guard band B _{GUARD_2 is} regarded as the second out-of-band viewing range B _{OUT_2} .

於另一實施例中，如圖4B所示，頻帶選取電路161可被設計為根據能量的變化趨勢在頻譜S 中辨識出資料頻帶B_DATA 之一能量升緣（rising edge）與一能量降緣（falling edge），並將該能量升緣或該能量降緣排除於帶內檢視範圍B_IN 與帶外檢視範圍B_{OUT_1} 、B_{OUT_2} 之外。在圖4B呈現的範例中，資料頻帶B_DATA 的能量升緣被框示為虛線範圍410，而其能量降緣被框示為虛線範圍420。由圖4B可看出，帶內檢視範圍B_IN 與帶外檢視範圍B_{OUT_1} 、B_{OUT_2} 皆未包含該能量升緣與能量降緣。於實際情況中，能量升緣/降緣有可能全部或部分落在資料頻帶B_DATA 內，也有可能全部或部分落在防護頻帶B_GUARD 內。排除能量升緣/降緣的原因在於，此一轉換區間的能量不適合用以代表資料頻帶B_DATA 的整體能量準位，亦不適合用以代表防護頻帶B_GUARD 的整體能量準位。In another embodiment, as shown in FIG. 4B, the frequency band selection circuit 161 may be designed to identify an energy rising edge and an energy falling edge of the data band B _DATA in the frequency spectrum S according to the energy change trend (Falling edge), and exclude the energy rising edge or the energy falling edge from the in-band inspection range B _IN and the out-of-band inspection range B _{OUT_1} , B _{OUT_2} . In the example presented in FIG. 4B, the energy rising edge of the data band B _DATA is framed as a dashed range 410, and the energy falling edge is framed as a dashed range 420. It can be seen from FIG. 4B that _{neither the in-} band inspection range B _{IN nor the out-of-} band inspection ranges B _{OUT_1} and B _{OUT_2} include the energy rising edge and energy falling edge. In actual situations, the energy rising/falling edge may be wholly or partially within the data band B _DATA , or may be wholly or partially within the guard band B _GUARD . The reason for excluding the energy rising/falling edge is that the energy in this conversion interval is not suitable for representing the overall energy level of the data band B _DATA , nor for representing the overall energy level of the guard band B _GUARD .

峰值選取電路162負責於第一帶外檢視範圍B_{OUT_1} 中選取一第一帶外能量峰值P_{OUT_1} 、於第二帶外檢視範圍B_{OUT_2} 中選取一第二帶外能量峰值P_{OUT_2} ，並且於帶內檢視範圍B_IN 中選取一帶內能量峰值P_IN ，也就是選取出這三個檢視範圍內各自的最高能量值，例如圖4B中所標示者。Select circuit 162 is responsible for a peak in the range of view outside the first band B _{OUT_1} select a first outer band energy peak P _{OUT_1,} select a second outer band peak energy P _{OUT_2} outer viewing range B _{OUT_2} second belt, and the belt B _iN the view area within the selected energy peak area P _iN, that is, select a maximum energy value of each of the three viewing range, for example, as indicated by Figure 4B.

隨後，計算電路163可根據帶內能量峰值P_IN 與第一帶外能量峰值P_{OUT_1} 估計第一信號雜訊比SNR_{_1} ，並根據帶內能量峰值P_IN 與第二帶外能量峰值P_{OUT_2} 估計第二信號雜訊比SNR_{_2} 。舉例而言，計算電路163可採用下列運算式：Subsequently, the calculation circuit 163 may estimate the energy peaks in the P _IN and the outer band of the first band energy peak P _{OUT_1} a first signal to noise ratio SNR _{_1,} and estimates the energy peaks in the peak energy of the outer band and the second band P _IN P _{OUT_2} The second signal to noise ratio SNR _{_2} . For example, the calculation circuit 163 may use the following formula:

(式一)

(Formula 1)

接著，鄰頻干擾偵測電路170會根據信號雜訊比估計電路160提供的第一信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 判斷接收信號Y 中是否存在鄰頻干擾。具體地說，所謂鄰頻干擾便是指防護頻帶B_{GUARD_1} 或B_{GUARD_2} 中出現不在預期之中的異常能量。因此，如果不存在鄰頻干擾，則第一信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 的絕對值差異（以下用符號diff 表示）通常很小。相對地，若存在鄰頻干擾，則信號雜訊比SNR_{_1} 、SNR_{_2} 便會有相當大的差距；鄰頻干擾愈強，差異diff 就愈大。Next, the adjacent channel interference detection circuit 170 based on the first signal-noise ratio estimation circuit 160 to provide noise ratio SNR _{_1} and the second signal noise ratio SNR _{_2} presence of adjacent channel interference is determined whether the received signal Y. Specifically, the so-called adjacent frequency interference refers to the unexpected energy in the guard band B _{GUARD_1} or B _{GUARD_2} that is not expected. Thus, if adjacent channel interference is not present, then the signal to noise ratio SNR _{_1} first and second signal noise ratio SNR _{_2} difference absolute value (hereinafter indicated by symbol diff) is generally small. In contrast, if the adjacent channel interference is present, the signal to noise ratio SNR _{_1,} SNR _{_2} will have a considerable gap; adjacent channel interference, the stronger, the greater the difference diff.

於一實施例中，鄰頻干擾偵測電路170係比較差異diff 是否高於一預設門檻值；當差異diff 的絕對值高於該預設門檻值，便判定接收信號Y 中存在鄰頻干擾。實務上，該預設門檻值不以特定數值為限。舉例而言，該預設門檻值可根據解映射/解碼電路150對於失真數量的容忍度來決定。如先前所述，差異diff 愈大，表示鄰頻干擾愈強，自動增益控制電路110輸出之信號Y ’中包含失真信號的機率也愈大。對許多具有糾錯功能的解碼器來說，當失真信號的出現機率高於一特定值，便可能會解碼失敗。相對地，當失真信號的出現機率低於該特定值，即使有失真信號存在，解碼器仍能修正錯誤、正確解碼。電路設計者可預先進行實驗或模擬，統計出當差異diff 達到多高，就可能會讓失真信號的數量過多、影響解碼器的成功率，並據此決定該預設門檻值。若控制信號Z 指出差異diff 低於該預設門檻值，自動增益控制電路110便不需要調降施加於接收信號Y 的增益。相對地，若差異diff 高於該預設門檻值，則自動增益控制電路110可適度調降增益，藉此避免過多的異常振幅經過自動增益控制電路110後超出等化電路140的輸入信號動態範圍而導致解映射/解碼電路150解碼失敗。In one embodiment, the adjacent channel interference detection circuit 170 compares whether the difference diff is higher than a preset threshold; when the absolute value of the difference diff is higher than the preset threshold, it determines that there is adjacent channel interference in the received signal Y . In practice, the preset threshold is not limited to a specific value. For example, the predetermined threshold can be determined according to the tolerance of the demapping/decoding circuit 150 to the amount of distortion. As described above, the greater the difference diff , the stronger the adjacent-channel interference, and the greater the probability that the signal Y ′ output by the automatic gain control circuit 110 includes a distorted signal. For many decoders with error correction function, when the occurrence probability of the distorted signal is higher than a certain value, decoding may fail. On the contrary, when the occurrence probability of the distorted signal is lower than the specific value, even if the distorted signal exists, the decoder can still correct the error and correctly decode. The circuit designer can conduct experiments or simulations in advance to calculate how high the difference diff is , which may cause excessive distortion signals and affect the success rate of the decoder, and determine the preset threshold accordingly. If the control signal Z indicates that the difference diff is lower than the preset threshold, the automatic gain control circuit 110 does not need to reduce the gain applied to the received signal Y. On the contrary, if the difference diff is higher than the preset threshold, the automatic gain control circuit 110 can moderately reduce the gain, thereby avoiding excessive abnormal amplitude passing through the automatic gain control circuit 110 and exceeding the dynamic range of the input signal of the equalization circuit 140 As a result, decoding by the demapping/decoding circuit 150 fails.

須說明的是，第一信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 的產生方式不以上述機制為限。舉例而言，如圖4C所示，頻帶選取電路161可在資料頻帶B_DATA 中選取鄰近於第一帶外檢視範圍B_{OUT_1} 之一第一帶內檢視範圍B_{IN_1} ，並且於資料頻帶B_DATA 中選取鄰近於第二帶外檢視範圍B_{OUT_2} 之一第二帶內檢視範圍B_{IN_2} 。這兩個帶內檢視範圍B_{IN_1} 、B_{IN_2} 皆小於資料頻帶B_DATA 且彼此並未重疊。峰值選取電路162於第一帶內檢視範圍B_{IN_1} 中選取一第一帶內能量峰值P_{IN_1} ，並於第二帶內檢視範圍B_{IN_2} 中選取一第二帶內能量峰值P_{IN_2} 。在這個實施例中，計算電路163係根據第一帶內能量峰值P_{IN_1} 與第一帶外能量峰值P_{OUT_1} 估計第一信號雜訊比SNR_{_1} ，並根據第二帶內能量峰值P_{IN_2} 與第二帶外能量峰值P_{OUT_2} 估計第二信號雜訊比SNR_{_2} ，例如採用下列運算式：It should be noted that the generation methods of the first signal-to-noise ratio SNR _{_1} and the second signal-to-noise ratio SNR _{_2} are not limited to the above mechanism. For example, as shown in FIG. 4C, the frequency band selection circuit 161 may select the view area proximate to the outer band of the first viewing range B _{IN_1} within one of a first band in the data B _{OUT_1} band B _DATA, and the data in the frequency band B _DATA A second in-band viewing range B _{IN_2} adjacent to the second out-of-band viewing range B _{OUT_2 is selected} . The two in-band viewing ranges B _{IN_1} and B _{IN_2 are} smaller than the data band B _DATA and do not overlap each other. View Select circuit 162 peak energy peak within a selected range B _{IN_1} P _{IN_1} first tape in the first _tape, and examine energy peak within a selected range B _{IN_2} P _{IN_2} second band in a second band. In this embodiment, the calculation circuit 163 estimates the first signal-to-noise ratio SNR _{_1} based on the first in-band energy peak P _{IN_1} and the first out-of-band energy peak P _{OUT_1} , and based on the second in-band energy peak P _{IN_2} and the first The two out-of-band energy peaks P _{OUT_2} estimate the second signal-to-noise ratio SNR _{_2} , for example, using the following formula:

(式二)

(Formula 2)

須說明的是，鄰頻干擾偵測電路170係根據第一信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 的差異來判斷鄰頻干擾是否存在；實務上，信號雜訊比估計電路160並不需要提供絕對準確精細的信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 。相對於檢視整個資料頻帶B_DATA ，選取兩個較小的帶內檢視範圍的好處在於，峰值選取電路162在選取帶內能量峰值時可檢視較少筆資料，因此效率較高，並且通常已足以產出供鄰頻干擾偵測電路170做出正確判斷的信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 。Should be noted that the adjacent channel interference detection circuit 170 based ratio SNR _{_1} and the second difference signal noise ratio SNR _{_2} to determine whether there is a first adjacent channel interference noise signal; In practice, the signal to noise ratio estimation circuit 160 does not need to provide absolutely accurate and fine signal-to-noise ratio SNR _{_1} and second signal-to-noise ratio SNR _{_2} . Compared with viewing the entire data band B _DATA , the advantage of selecting two smaller in-band viewing ranges is that the peak selection circuit 162 can view fewer data when selecting the in-band energy peak, so the efficiency is higher and is usually sufficient noise output signal for the adjacent channel interference detection circuit 170 to make the right judgment ratio SNR _{_1} the second signal noise ratio SNR _{_2.}

另一方面，若接收信號Y 符合正交分頻多工（OFDM）規範，則頻譜產生電路120可針對接收信號Y 中的N個符號（symbol）各自產生一頻譜S_i （N為大於一之整數，整數指標i = 1~N），且信號雜訊比估計電路160於估計信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 時，可將該N個頻譜皆納入考量。以上述頻帶選取電路161會在資料頻帶B_DATA 中選取兩個帶內檢視範圍的情況為例。每分析完一個頻譜，峰值選取電路162便會提供四個峰值（第一帶內能量峰值P_{IN_1_i} 、第一帶外能量峰值P_{OUT_1_i} 、第二帶內能量峰值P_{IN_2_i} 、第二帶外能量峰值P_{OUT_2_i} ）給計算電路163。圖5呈現計算電路163的一個詳細實施範例，其中包含四個平滑化迴圈濾波器（smooth loop filter）163A~163D與一比值計算電路163E。On the other hand, if the received signal Y conforms to the Orthogonal Frequency Division Multiplexing (OFDM) specification, the spectrum generating circuit 120 may generate a spectrum S _i (N is greater than one) for each of the N symbols in the received signal Y integer, the integer index i = 1 ~ N), and the noise signal to estimate signal-noise ratio SNR _{_2,} can be the ratio of N spectral SNR _{_1} ratio estimation circuit 160 and the second signal are noise into account. Take the case where the above band selection circuit 161 selects two in-band viewing ranges in the data band B _DATA as an example. Each time a spectrum is analyzed, the peak selection circuit 162 will provide four peaks (first in-band energy peak P _{IN_1_ i} , first out-of-band energy peak P _{OUT_1_ i} , second in-band energy peak P _{IN_2_ i} , second band The external energy peak value P _{OUT_2_ i} ) is given to the calculation circuit 163. FIG. 5 presents a detailed implementation example of the calculation circuit 163, which includes four smooth loop filters 163A-163D and a ratio calculation circuit 163E.

第一平滑化迴圈濾波器163A係用以根據一平滑化參數α將依序收到的N個第一帶內能量峰值P_{IN_1} 相加，藉此產生一第一加成後帶內能量峰值P_{IN_1_add} 。圖6呈現第一平滑化迴圈濾波器163A的一種詳細實施範例。平滑化參數α可由電路設計者根據實務經驗選定，例如設定為數值0.5或0.25。該N個第一帶內能量峰值P_{IN_1} 被依序送入第一平滑化迴圈濾波器163A。乘法器163A1負責將其中的第i 個峰值P_{IN_1_i} 乘上平滑化參數α，做為加法器163A2的輸入信號之一。透過延遲電路163A3與乘法器163A4的作用，加法器163A2的另一輸入信號為P_{IN_add _(i -1)} 與數值(α-1)的乘積。在該N個第一帶內能量峰值P_{IN_1} 都被依序加成後，能量P_{IN_1_add_N} 即為第一加成後帶內能量峰值P_{IN_1_add} 。The first smoothing loop filter 163A is used to add N first in-band energy peaks P _{IN_1} received in sequence according to a smoothing parameter α, thereby generating a first addition in-band energy peak P _{IN_1_add} . FIG. 6 presents a detailed implementation example of the first smoothing loop filter 163A. The smoothing parameter α can be selected by the circuit designer according to practical experience, for example, set to a value of 0.5 or 0.25. The N first in-band energy peaks P _{IN_1} are sequentially fed into the first smoothing loop filter 163A. Multipliers 163A1 responsible wherein the i-th peak _P IN_1_ _i multiplied by the smoothing parameters α, as one of the input signals of the adder 163A2. Through the action of the delay circuit 163A3 and the multiplier 163A4, the other input signal of the adder 163A2 is the product of P _{IN_add _( i -1)} and the value (α-1). After the N first in-band energy peaks P _{IN_1} are added sequentially, the energy P _{IN_1_add_N is} the first-in-band energy peak value P _{IN_1_add} .

相似地，第二平滑化迴圈濾波器163B係用以將N個第二帶內能量峰值P_{IN_2} 相加，藉此產生一第二加成後帶內能量峰值P_{IN_2_add} ；第三平滑化迴圈濾波器163C係用以將N個第一帶外能量峰值P_{OUT_1} 相加，藉此產生一第一加成後帶外能量峰值P_{OUT_1_add} ；第四平滑化迴圈濾波器163D係用以將N個第二帶外能量峰值P_{OUT_2} 相加，藉此產生一第二加成後帶外能量峰值P_{OUT_2_add} 。Similarly, the second smoothing loop filter 163B is used to add N second in-band energy peaks P _{IN_2} , thereby generating a second addition in-band energy peak P _{IN_2_add} ; the third smoothing loop The loop filter 163C is used to add N first out-of-band energy peaks P _{OUT_1} , thereby generating a first added out-of-band energy peak P _{OUT_1_add} ; the fourth smoothed loop filter 163D is used to The N second out-of-band energy peaks P _{OUT_2} are added, thereby generating a second added out-of-band energy peak P _{OUT_2_add} .

隨後，比值計算電路163E負責計算第一加成後帶內能量峰值P_{IN_1_add} 與第一加成後帶外能量峰值P_{OUT_1_add} 的比值，做為第一信號雜訊比SNR _{_1} ：Subsequently, after calculating a ratio of the energy band of the first peak _P IN_1_add after addition of the first addition circuit 163E is responsible for calculating the ratio of the peak power _P OUT_1_add outer band, as a first signal noise ratio SNR _{_1:}

(式三)

(Formula 3)

並計算第二加成後帶內能量峰值P_{IN_2_add} 與第二加成後帶外能量峰值P_{OUT_2_add} 的比值，做為第二信號雜訊比SNR _{_2} ：And calculate the ratio of the peak in-band energy P _{IN_2_add} after the second addition and the peak out-of-band energy P _{OUT_2_add} after the second addition as the second signal-to-noise ratio SNR _{_2} :

(式四)

(Formula 4)

將多個符號納入考慮的好處在於能夠觀察更大的時間範圍，避免通訊環境中的短期擾動影響了信號雜訊比SNR_{_1} 與第二信號雜訊比SNR_{_2} 的整體正確性。The benefit of taking multiple symbols into consideration is the ability to observe a larger time range and avoid short-term disturbances in the communication environment that affect the overall accuracy of the signal-to-noise ratio SNR _{_1} and the second signal-to-noise ratio SNR _{_2} .

實務上，前述信號雜訊比估計電路160與鄰頻干擾偵測電路170可被實現為固定式及/或可程式化數位邏輯電路，包含可程式化邏輯閘陣列、特定應用積體電路、微控制器、微處理器、數位信號處理器，與其他必要電路。本發明所屬技術領域中具有通常知識者可理解，有多種電路組態和元件可在不背離本發明精神的情況下實現本發明的概念。In practice, the aforementioned signal-to-noise ratio estimation circuit 160 and adjacent frequency interference detection circuit 170 can be implemented as fixed and/or programmable digital logic circuits, including programmable logic gate arrays, application specific integrated circuits, micro Controller, microprocessor, digital signal processor, and other necessary circuits. Those of ordinary skill in the technical field to which the present invention pertains will understand that there are a variety of circuit configurations and components that can implement the concepts of the present invention without departing from the spirit of the present invention.

須說明的是，鄰頻干擾偵測電路170產生的控制信號Z 還有可能被用來做為設定多種系統參數的參考值，不限於用以決定是否應調整自動增益控制電路110的增益。It should be noted that the control signal Z generated by the adjacent-channel interference detection circuit 170 may also be used as a reference value for setting various system parameters, not limited to determining whether the gain of the automatic gain control circuit 110 should be adjusted.

根據本發明之另一實施例為一種應用於一通訊接收裝置之信號處理方法，其流程圖係繪示於圖7。首先，步驟S701為針對一接收信號產生一頻譜，其中該頻譜包含一資料頻帶、位於該資料頻帶一側之一第一防護頻帶，以及位於該資料頻帶另一側之一第二防護頻帶。隨後，步驟S702為估計該資料頻帶相對於該第一防護頻帶之一第一信號雜訊比。步驟S703則是估計該資料頻帶相對於該第二防護頻帶之一第二信號雜訊比。步驟S704為根據該第一信號雜訊比與該第二信號雜訊比判斷該接收信號中是否存在一鄰頻干擾。Another embodiment according to the present invention is a signal processing method applied to a communication receiving device. The flowchart is shown in FIG. 7. First, step S701 is to generate a spectrum for a received signal, where 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. Subsequently, step S702 is to estimate a first signal-to-noise ratio of the data band relative to the first guard band. Step S703 is to estimate a second signal-to-noise ratio of the data band relative to the second guard band. Step S704 is 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.

本發明所屬技術領域中具有通常知識者可理解，圖7中某些步驟的順序可被調換或是同時進行，並不會影響該信號處理方法的整體效果。此外，先前在介紹通訊接收裝置100時描述的各種操作變化亦可應用至圖7呈現的信號處理方法，其細節不再贅述。Those of ordinary skill in the technical field to which the present invention pertains will understand that the order of certain steps in FIG. 7 can be reversed or performed simultaneously, without affecting the overall effect of the signal processing method. In addition, the various operation changes previously described when introducing the communication receiving device 100 can also be applied to the signal processing method presented in FIG. 7, and the details will not be repeated.

藉由以上具體實施例之詳述，係希望能更加清楚描述本發明之特徵與精神，而並非以上述所揭露的具體實施例來對本發明之範疇加以限制。相反地，其目的是希望能涵蓋各種改變及具相等性的安排於本發明所欲申請之專利範圍的範疇內。Through the detailed description of the above specific embodiments, it is hoped that the features and spirit of the present invention can be described more clearly, rather than limiting the scope of the present invention with the specific embodiments disclosed above. On the contrary, the purpose is to cover various changes and equivalent arrangements within the scope of the patent application of the present invention.

100:通訊接收裝置110:自動增益控制電路120:頻譜產生電路130:通道估計電路140:等化電路150:解映射/解碼電路160:信號雜訊比估計電路161:頻帶選取電路162:峰值選取電路163:計算電路163A~163D:平滑化迴圈濾波器163E:比值計算電路163A1:乘法器163A2:加法器163A3:延遲電路163A4:乘法器170:鄰頻干擾偵測電路410:能量升緣420:能量降緣B_DATA:資料頻帶B_{GUARD_1}:第一防護頻帶B_{GUARD_2}:第二防護頻帶B_IN:帶內檢視範圍B_{IN_1}:第一帶內檢視範圍B_{IN_2}:第二帶內檢視範圍B_{OUT_1}:第一帶外檢視範圍B_{OUT_2}:第二帶外檢視範圍

:通道脈衝響應估計值P_IN:帶內能量峰值P_{IN_1}、P_{IN_1_i} :第一帶內能量峰值P_{IN_2}、P_{IN_2_i} :第二帶內能量峰值P_{IN_1_add}:第一加成後帶內能量峰值P_{IN_2_add}:第二加成後帶內能量峰值P_{OUT_1}、P_{OUT_1_i} :第一帶外能量峰值P_{OUT_2}、P_{OUT_2_i} :第二帶外能量峰值P_{OUT_1_add}:第一加成後帶外能量峰值P_{OUT_2_add}:第二加成後帶外能量峰值S701~S706:流程步驟S頻譜SNR_{_1}:第一信號雜訊比SNR_{_2}:第二信號雜訊比

:等化後信號Y:接收信號Y’:輸出信號Z:控制信號α:平滑化參數100: communication receiving device 110: automatic gain control circuit 120: spectrum generation circuit 130: channel estimation circuit 140: equalization circuit 150: demapping/decoding circuit 160: signal-to-noise ratio estimation circuit 161: band selection circuit 162: peak selection Circuit 163: Calculation circuits 163A to 163D: Smoothing loop filter 163E: Ratio calculation circuit 163A1: Multiplier 163A2: Adder 163A3: Delay circuit 163A4: Multiplier 170: Adjacent frequency interference detection circuit 410: Energy rise 420 : Energy falling edge B _DATA : Data band B _{GUARD_1} : First guard band B _{GUARD_2} : Second guard band B _IN : In-band viewing range B _{IN_1} : First in-band viewing range B _{IN_2} : Second in-band viewing range B _{OUT_1} : First out-of-band inspection range B _{OUT_2} : Second out-of-band inspection range

: Channel impulse response estimated value P _IN : In-band energy peaks P _{IN_1} , P _{IN_1_ i} : First in-band energy peak P _{IN_2} , P _{IN_2_ i} : Second in-band energy peak P _{IN_1_add} : In-band energy after the first addition peak _P IN_2_add: with the addition of the second energy peak _{P OUT_1,} P OUT_1_ _i: a first outer band energy peak _{P OUT_2,} P OUT_2_ _i: a second outer band energy peak _P OUT_1_add: after the addition of the first energy band Peak P _{OUT_2_add} : Peak of out-of-band energy after the second addition S701~S706: process step S spectrum SNR _{_1} : first signal to noise ratio SNR _{_2} : second signal to noise ratio

: Equalized signal Y : Received signal Y' : Output signal Z : Control signal α: Smoothing parameter

［圖1］顯示本發明之一實施例中的通訊接收裝置之功能方塊圖； ［圖2］顯示本發明之一實施例中的一頻譜範例； ［圖3］顯示圖3是圖2中步驟S162之後的流程示意圖； ［圖4A］至［圖4C］顯示本發明之一實施例中用以說明根據本發明之帶內檢視範圍與帶外檢視範圍的頻譜範例； ［圖5］顯示本發明之一實施例中的計算電路之功能方塊圖； ［圖6］顯示本發明之一實施例中的平滑化迴圈濾波器之功能方塊圖；以及 ［圖7］顯示本發明之一實施例中的通訊接收裝置之信號處理方法的流程圖。[FIG. 1] shows a functional block diagram of a communication receiving device in an embodiment of the invention; [FIG. 2] shows an example of a spectrum in an embodiment of the invention; [FIG. 3] shows that FIG. 3 shows the steps in FIG. 2. Schematic diagram of the process after S162; [FIG. 4A] to [FIG. 4C] show examples of the frequency spectrum used to illustrate the in-band inspection range and the out-of-band inspection range according to the present invention in one embodiment of the invention; [FIG. 5] shows the invention A functional block diagram of a calculation circuit in an embodiment; [FIG. 6] shows a functional block diagram of a smoothed loop filter in an embodiment of the invention; and [FIG. 7] shows an embodiment of the invention Flowchart of the signal processing method of the communication receiving device.

須說明的是，本發明的圖式包含呈現多種彼此關聯之功能性模組的功能方塊圖。該等圖式並非細部電路圖，且其中的連接線僅用以表示信號流。功能性元件及/或程序間的多種互動關係不一定要透過直接的電性連結始能達成。此外，個別元件的功能不一定要如圖式中繪示的方式分配，且分散式的區塊不一定要以分散式的電子元件實現。It should be noted that the drawings of the present invention include functional block diagrams showing various functional modules related to each other. These drawings are not detailed circuit diagrams, and the connecting lines are only used to represent the signal flow. Multiple interactions between functional components and/or programs need not necessarily be achieved through direct electrical connections. In addition, the functions of individual components do not have to be distributed as shown in the drawings, and the distributed blocks do not have to be implemented by distributed electronic components.

100:通訊接收裝置 100: communication receiving device

110:自動增益控制電路 110: Automatic gain control circuit

120:頻譜產生電路 120: Spectrum generation circuit

130:通道估計電路 130: Channel estimation circuit

140:等化電路 140: Equalization circuit

150:解映射/解碼電路 150: demapping/decoding circuit

160:信號雜訊比估計電路 160: Signal-to-noise ratio estimation circuit

170:鄰頻干擾偵測電路 170: adjacent frequency interference detection circuit

:通道脈衝響應估計值

: Channel impulse response estimate

S:頻譜 S : spectrum

SNR_{_1}:第一信號雜訊比 SNR _{_1} : the first signal to noise ratio

SNR_{_2}:第二信號雜訊比 SNR _{_2} : second signal to noise ratio

:等化後信號

: Signal after equalization

Y:接收信號 Y : Receive signal

Y’:輸出信號 Y' : output signal

Z:控制信號 Z : control signal

Claims (12)

一種通訊接收裝置，包含： 一頻譜產生電路，用以針對一接收信號產生一頻譜，其中該頻譜包含一資料頻帶、位於該資料頻帶一側之一第一防護頻帶，以及位於該資料頻帶另一側之一第二防護頻帶； 一信號雜訊比估計電路，用以估計該資料頻帶相對於該第一防護頻帶之一第一信號雜訊比，並估計該資料頻帶相對於該第二防護頻帶之一第二信號雜訊比；以及 一鄰頻干擾偵測電路，用以根據該第一信號雜訊比與該第二信號雜訊比判斷該接收信號中是否存在一鄰頻干擾。A communication receiving device includes: a frequency spectrum generating circuit for generating a frequency spectrum for a received signal, wherein the frequency spectrum includes a data frequency band, a first guard band on one side of the data frequency band, and another on the data frequency band A second guard band on the side; 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 the data band relative to the second guard band A second signal-to-noise ratio; and a neighboring-frequency interference detection circuit, used to determine whether there is a neighboring-frequency interference in the received signal according to the first signal-to-noise ratio and the second signal-to-noise ratio. 如申請專利範圍第1項所述之通訊接收裝置，其中該信號雜訊比估計電路包含： 一頻帶選取電路，用以於該資料頻帶中選取一帶內檢視範圍、於該第一防護頻帶中選取一第一帶外檢視範圍，並且於該第二防護頻帶中選取一第二帶外檢視範圍； 一峰值選取電路，用以於該帶內檢視範圍中選取一帶內能量峰值、於該第一帶外檢視範圍中選取一第一帶外能量峰值，並且於該第二帶外檢視範圍中選取一第二帶外能量峰值；以及 一計算電路，用以根據該帶內能量峰值與該第一帶外能量峰值估計該第一信號雜訊比，並係根據該帶內能量峰值與該第二帶外能量峰值估計該第二信號雜訊比。The communication receiving device as described in item 1 of the patent application scope, wherein the signal-to-noise ratio estimation circuit includes: a frequency band selection circuit for selecting an in-band viewing range in the data band and selecting in the first guard band A first out-of-band inspection range, and a second out-of-band inspection range is selected in the second guard band; a peak selection circuit for selecting an in-band energy peak in the in-band inspection range, in the first band A first out-of-band energy peak is selected in the out-of-view range, and a second out-of-band energy peak is selected in the second out-of-band view range; and a calculation circuit is used to determine the first out-of-band energy peak and the first band The external energy peak estimates the first signal-to-noise ratio, and estimates the second signal-to-noise ratio based on the in-band energy peak and the second out-of-band energy peak. 如申請專利範圍第1項所述之通訊接收裝置，其中該信號雜訊比估計電路包含： 一頻帶選取電路，用以於該資料頻帶中選取鄰近於該第一帶外檢視範圍之一第一帶內檢視範圍、於該資料頻帶中選取鄰近於該第二帶外檢視範圍之一第二帶內檢視範圍、於該第一防護頻帶中選取一第一帶外檢視範圍，並且於該第二防護頻帶中選取一第二帶外檢視範圍； 一峰值選取電路，用以於該第一帶內檢視範圍中選取一第一帶內能量峰值，並於該第二帶內檢視範圍中選取一第二帶內能量峰值、於該第一帶外檢視範圍中選取一第一帶外能量峰值，並且於該第二帶外檢視範圍中選取一第二帶外能量峰值；以及 一計算電路，用以根據該第一帶內能量峰值與該第一帶外能量峰值估計該第一信號雜訊比，並係根據該第二帶內能量峰值與該第二帶外能量峰值估計該第二信號雜訊比。The communication receiving device as described in item 1 of the patent application range, wherein the signal-to-noise ratio estimation circuit includes: a frequency band selection circuit for selecting a first adjacent to the first out-of-band viewing range in the data frequency band In-band viewing range, select a second in-band viewing range adjacent to the second out-of-band viewing range in the data band, select a first out-of-band viewing range in the first guard band, and select in the second A second out-of-band inspection range is selected in the guard band; a peak selection circuit is used to select a first in-band energy peak in the first in-band inspection range and a first in-band inspection range Two in-band energy peaks, a first out-of-band energy peak is selected in the first out-of-band inspection range, and a second out-of-band energy peak is selected in the second out-of-band inspection range; and a calculation circuit for The first signal-to-noise ratio is estimated based on the first in-band energy peak and the first out-of-band energy peak, and the second signal noise is estimated based on the second in-band energy peak and the second out-of-band energy peak ratio. 如申請專利範圍第1項所述之通訊接收裝置，其中信號雜訊比估計電路於該頻譜中辨識出該資料頻帶與該第一防護頻帶間之一能量升緣、辨識出該資料頻帶與該第二防護頻帶間之一能量降緣，並且於估計該第一信號雜訊比與該第二信號雜訊比時排除該能量升緣及該能量降緣包含之能量。The communication receiving device as described in item 1 of the patent application scope, wherein the signal-to-noise ratio estimation circuit identifies an energy rising edge between the data band and the first guard band in the frequency spectrum, and identifies the data band and the An energy falling edge between the second guard bands, and excluding the energy included 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. 如申請專利範圍第1項所述之通訊接收裝置，其中該接收信號符合一正交分頻多工規範，該頻譜產生電路針對該接收信號中的N個符號各自產生一頻譜，其中N為大於一之整數；於估計該第一信號雜訊比與該第二信號雜訊比時，該信號雜訊比估計電路將該N個頻譜納入考量。The communication receiving device as described in item 1 of the patent application, wherein the received signal conforms to an orthogonal frequency division multiplexing specification, and the spectrum generation circuit generates a spectrum for each of the N symbols in the received signal, where N is greater than An integer of one; when estimating the first signal-to-noise ratio and the second signal-to-noise ratio, the signal-to-noise ratio estimation circuit takes the N spectrums into consideration. 如申請專利範圍第5項所述之通訊接收裝置，其中該信號雜訊比估計電路包含： 一頻帶選取電路，用以針對該N個頻譜中的每一個頻譜，於該第一防護頻帶中選取一第一帶外檢視範圍，並且於該第二防護頻帶中選取一第二帶外檢視範圍； 一峰值選取電路，用以針對該N個頻譜中的每一個頻譜，於該第一帶外檢視範圍中選取一第一帶外能量峰值，並且於該第二帶外檢視範圍中選取一第二帶外能量峰值； 一第一平滑化迴圈濾波器，用以根據一平滑化參數將該N個第一帶外能量峰值相加，藉此產生一第一加成後帶外峰值； 一第二平滑化迴圈濾波器，用以根據該平滑化參數將該N個第二帶外能量峰值相加，藉此產生一第二加成後帶外峰值；以及 一計算電路，用以根據該第一加成後帶外峰值估計該第一信號雜訊比，並係根據該第二加成後帶外峰值估計該第二信號雜訊比。The communication receiving device as described in item 5 of the patent application range, wherein the signal-to-noise ratio estimation circuit includes: a frequency band selection circuit for selecting each of the N spectrums in the first guard band A first out-of-band viewing range, and a second out-of-band viewing range is selected in the second guard band; a peak selection circuit is used to view out of the first out-of-band for each of the N spectrums Select a first out-of-band energy peak in the range and select a second out-of-band energy peak in the second out-of-band viewing range; a first smoothing loop filter is used to set the N according to a smoothing parameter A first out-of-band energy peak is added, thereby generating a first added out-of-band peak; a second smoothing loop filter is used to apply the N second out-of-band energy peaks according to the smoothing parameter Adding, thereby generating a second out-of-band peak after addition; and a calculation circuit for estimating the first signal-to-noise ratio based on the first out-of-band peak after addition, and based on the second addition The out-of-band peak value estimates the second signal-to-noise ratio. 一種應用於一通訊接收裝置之信號處理方法，包含： (a)針對一接收信號產生一頻譜，其中該頻譜包含一資料頻帶、位於該資料頻帶一側之一第一防護頻帶，以及位於該資料頻帶另一側之一第二防護頻帶； (b)估計該資料頻帶相對於該第一防護頻帶之一第一信號雜訊比，並估計該資料頻帶相對於該第二防護頻帶之一第二信號雜訊比；以及 (c)根據該第一信號雜訊比與該第二信號雜訊比判斷該接收信號中是否存在一鄰頻干擾。A signal processing method applied to a communication receiving device, including: (a) generating a frequency spectrum for a received signal, wherein the frequency spectrum includes a data frequency band, a first guard band located on one side of the data frequency band, and the data located on the data A second guard band on the other side of the frequency band; (b) estimate a first signal-to-noise ratio of the data band relative to the first guard band, and estimate a second of the data band relative to one of the second guard band Signal-to-noise ratio; and (c) judging whether there is an adjacent frequency interference in the received signal according to the first-to-noise ratio and the second-to-noise ratio. 如申請專利範圍第7項所述之信號處理方法，其中步驟(b)包含： 於該資料頻帶中選取一帶內檢視範圍、於該第一防護頻帶中選取一第一帶外檢視範圍，並且於該第二防護頻帶中選取一第二帶外檢視範圍； 於該帶內檢視範圍中選取一帶內能量峰值、於該第一帶外檢視範圍中選取一第一帶外能量峰值，並且於該第二帶外檢視範圍中選取一第二帶外能量峰值；以及 根據該帶內能量峰值與該第一帶外能量峰值估計該第一信號雜訊比，並根據該帶內能量峰值與該第二帶外能量峰值估計該第二信號雜訊比。The signal processing method as described in item 7 of the patent application scope, wherein step (b) includes: selecting an in-band viewing range in the data band, selecting a first out-of-band viewing range in the first guard band, and Select a second out-of-band viewing range in the second guard band; select an in-band energy peak in the in-band viewing range, select a first out-of-band energy peak in the first out-of-band viewing range, and select Select a second out-of-band energy peak in the two out-of-band viewing ranges; and estimate the first signal-to-noise ratio based on the in-band energy peak and the first out-of-band energy peak, and based on the in-band energy peak and the second The peak out-of-band energy estimates the second signal-to-noise ratio. 如申請專利範圍第7項所述之信號處理方法，其中步驟(b)包含： 於該資料頻帶中選取鄰近於該第一帶外檢視範圍之一第一帶內檢視範圍、於該資料頻帶中選取鄰近於該第二帶外檢視範圍之一第二帶內檢視範圍、於該第一防護頻帶中選取一第一帶外檢視範圍，並且於該第二防護頻帶中選取一第二帶外檢視範圍； 於該第一帶內檢視範圍中選取一第一帶內能量峰值、於該第二帶內檢視範圍中選取一第二帶內能量峰值、於該第一帶外檢視範圍中選取一第一帶外能量峰值，並且於該第二帶外檢視範圍中選取一第二帶外能量峰值；以及 根據該第一帶內能量峰值與該第一帶外能量峰值估計該第一信號雜訊比，並根據該第二帶內能量峰值與該第二帶外能量峰值估計該第二信號雜訊比。The signal processing method as described in item 7 of the patent application scope, wherein step (b) includes: selecting a first in-band inspection range adjacent to the first out-of-band inspection range in the data band in the data frequency band Selecting a second in-band inspection range adjacent to the second out-of-band inspection range, selecting a first out-of-band inspection range in the first guard band, and selecting a second out-of-band inspection in the second guard band Range; select a first in-band energy peak in the first in-band viewing range, select a second in-band energy peak in the second in-band viewing range, and select a first in the first out-of-band viewing range An out-of-band energy peak, and selecting a second out-of-band energy peak in the second out-of-band viewing range; and estimating the first signal-to-noise ratio based on the first in-band energy peak and the first out-of-band energy peak And estimate the second signal-to-noise ratio based on the second peak in-band energy and the second peak out-of-band energy. 如申請專利範圍第7項所述之信號處理方法，其中步驟(b)包含： 於該頻譜中辨識出該資料頻帶與該第一防護頻帶間之一能量升緣； 辨識出該資料頻帶與該第二防護頻帶間之一能量降緣；以及 於估計該第一信號雜訊比與該第二信號雜訊比時排除該能量升緣及該能量降緣包含之能量。The signal processing method as described in item 7 of the patent application scope, wherein step (b) includes: identifying an energy rising edge between the data band and the first guard band in the frequency spectrum; identifying the data band and the An energy falling edge between the second guard bands; and excluding the energy included 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. 如申請專利範圍第7項所述之信號處理方法，其中該接收信號符合一正交分頻多工規範；該信號處理方法包含： 針對該接收信號中的N個符號各自產生一頻譜，其中N為大於一之整數；以及 於估計該第一信號雜訊比與該第二信號雜訊比時，將該N個頻譜納入考量。The signal processing method as described in item 7 of the patent application scope, wherein the received signal conforms to an orthogonal frequency division multiplexing specification; the signal processing method includes: generating a spectrum for each of the N symbols in the received signal, where N Is an integer greater than one; and when estimating the first signal-to-noise ratio and the second signal-to-noise ratio, the N spectrums are taken into consideration. 如申請專利範圍第11項所述之信號處理方法，其中步驟(b)包含： 針對該N個頻譜中的每一個頻譜，於該第一防護頻帶中選取一第一帶外檢視範圍，並且於該第二防護頻帶中選取一第二帶外檢視範圍； 針對該N個頻譜中的每一個頻譜，於該第一帶外檢視範圍中選取一第一帶外能量峰值，並且於該第二帶外檢視範圍中選取一第二帶外能量峰值； 根據一平滑化參數將該N個第一帶外能量峰值相加，藉此產生一第一加成後帶外峰值； 根據該平滑化參數將該N個第二帶外能量峰值相加，藉此產生一第二加成後帶外峰值；以及 根據該第一加成後帶外峰值估計該第一信號雜訊比，並係根據該第二加成後帶外峰值估計該第二信號雜訊比。The signal processing method as described in item 11 of the patent application scope, wherein step (b) includes: for each of the N spectrums, select a first out-of-band viewing range in the first guard band, and A second out-of-band viewing range is selected in the second guard band; for each of the N spectrums, a first out-of-band energy peak is selected in the first out-of-band viewing range and in the second band Select a second out-of-band energy peak in the out-of-view range; add the N first out-of-band energy peaks according to a smoothing parameter, thereby generating a first added out-of-band peak; according to the smoothing parameter The N second out-of-band energy peaks are added to thereby generate a second post-addition out-of-band peak; and the first signal-to-noise ratio is estimated based on the first post-addition out-of-band peak, and is based on the first After the second addition, the out-of-band peak value estimates the second signal-to-noise ratio.

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