TWI666897B - Device and method for handling signal interference - Google Patents

Device and method for handling signal interference Download PDF

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TWI666897B
TWI666897B TW107106561A TW107106561A TWI666897B TW I666897 B TWI666897 B TW I666897B TW 107106561 A TW107106561 A TW 107106561A TW 107106561 A TW107106561 A TW 107106561A TW I666897 B TWI666897 B TW I666897B
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signals
frequency
generate
circuit
signal
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TW107106561A
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TW201914273A (en
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王晉良
詹閔超
王文山
張元碩
王吳祺
林盈熙
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瑞昱半導體股份有限公司
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Priority to CN201810342578.3A priority Critical patent/CN109428849B/en
Priority to US16/120,417 priority patent/US10305523B2/en
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Abstract

一種傳送裝置，用來處理訊號干擾，包含有一第一傳送電路，用來處理第一複數個基頻訊號，以產生第一複數個射頻訊號；一第二傳送電路，用來處理第二複數個基頻訊號及複數個輸入訊號，以產生第二複數個射頻訊號；一回饋電路，耦接於該第二傳送電路，用來處理該第二複數個射頻訊號及複數個洩漏訊號，以產生複數個誤差訊號；以及一控制電路，耦接於該第一傳送電路、該第二傳送電路及該回饋電路，用來根據該第一複數個基頻訊號及該複數個誤差訊號，產生該複數個輸入訊號。 A transmission device for processing signal interference includes a first transmission circuit for processing a first plurality of base frequency signals to generate a first plurality of radio frequency signals; a second transmission circuit for processing a second plurality of signals The baseband signal and the plurality of input signals to generate a second plurality of radio frequency signals; a feedback circuit coupled to the second transmission circuit for processing the second plurality of radio frequency signals and a plurality of leakage signals to generate a plurality of signals Error signals; and a control circuit, coupled to the first transmission circuit, the second transmission circuit, and the feedback circuit, for generating the plurality of signals based on the first plurality of fundamental frequency signals and the plurality of error signals. Enter the signal.

Description

處理訊號干擾的裝置及方法 Device and method for processing signal interference

本發明相關於一種用於通訊系統的裝置及方法，尤指一種處理訊號干擾的裝置及方法。 The present invention relates to a device and method for a communication system, and more particularly to a device and method for processing signal interference.

根據習知技術，當不同類型的訊號(例如不同通訊標準的訊號)同時被傳送時，訊號間可能會相互干擾，不僅影響訊號的傳輸，也違反傳輸規範。 雖然已有數種習知技術被提出來降低此種訊號干擾，例如數位預矯正(digital pre-distortion)或較昂貴的濾波器。但這些方法存在有干擾消除的效能不佳或成本過於昂貴的缺點。因此，如何以有效且便宜的方法降低訊號干擾是亟待解決的問題。 According to the conventional technology, when different types of signals (such as signals of different communication standards) are transmitted at the same time, the signals may interfere with each other, which not only affects the transmission of the signals, but also violates the transmission specifications. Although several conventional techniques have been proposed to reduce such signal interference, such as digital pre-distortion or more expensive filters. However, these methods have the disadvantages of poor performance or excessive cost of interference cancellation. Therefore, how to reduce the signal interference in an effective and cheap way is an urgent problem.

因此，本發明提供了一種傳送裝置及傳送方法，用來處理訊號干擾，以解決上述問題。 Therefore, the present invention provides a transmission device and a transmission method for processing signal interference to solve the above problems.

本發明揭露一種傳送裝置，用來處理訊號干擾，包含有一第一傳送電路，用來處理第一複數個基頻訊號，以產生第一複數個射頻訊號；一第二傳送電路，用來處理第二複數個基頻訊號及複數個輸入訊號，以產生第二複數個 射頻訊號，其中該第一複數個射頻訊號的一第一頻率及該第二複數個射頻訊號的一第二頻率不相同；一回饋電路，耦接於該第二傳送電路，用來處理該第二複數個射頻訊號及複數個洩漏訊號，以產生複數個誤差訊號，其中該複數個洩漏訊號相關於該第一複數個射頻訊號；以及一控制電路，耦接於該第一傳送電路、該第二傳送電路及該回饋電路，用來根據該第一複數個基頻訊號及該複數個誤差訊號，產生該複數個輸入訊號。 The invention discloses a transmission device for processing signal interference, including a first transmission circuit for processing a first plurality of baseband signals to generate a first plurality of radio frequency signals; a second transmission circuit for processing a first Two or more baseband signals and plural input signals to generate a second plural A radio frequency signal, wherein a first frequency of the first plurality of radio frequency signals and a second frequency of the second plurality of radio frequency signals are different; a feedback circuit coupled to the second transmission circuit for processing the first Two or more radio frequency signals and multiple leak signals to generate a plurality of error signals, wherein the plurality of leak signals are related to the first plurality of radio frequency signals; and a control circuit coupled to the first transmission circuit, the first Two transmission circuits and the feedback circuit are used to generate the plurality of input signals according to the first plurality of fundamental frequency signals and the plurality of error signals.

10‧‧‧通訊系統 10‧‧‧Communication System

20‧‧‧傳送裝置 20‧‧‧ Transmission device

200、210、40‧‧‧傳送電路 200, 210, 40‧‧‧ transmission circuit

202、212‧‧‧放大器 202, 212‧‧‧amplifier

220、50‧‧‧回饋電路 220, 50‧‧‧ feedback circuit

230、30‧‧‧控制電路 230, 30‧‧‧ control circuit

300‧‧‧數位移頻電路 300‧‧‧ Digital shift frequency circuit

302‧‧‧估測電路 302‧‧‧Estimated Circuit

400、410‧‧‧升取樣器 400, 410‧‧‧L samplers

404、414、504、514‧‧‧混頻器 404, 414, 504, 514‧‧‧ mixers

402、412、502、512‧‧‧低通濾波器 402, 412, 502, 512‧‧‧ low-pass filters

500、510‧‧‧降取樣器 500, 510‧‧‧ downsampler

90‧‧‧流程 90‧‧‧ flow

900、902、904、906、908、910‧‧‧步驟 900, 902, 904, 906, 908, 910‧‧‧ steps

TX‧‧‧傳送端 TX‧‧‧ sender

RX‧‧‧接收端 RX‧‧‧Receiver

第1圖為本發明實施例一通訊系統的示意圖。 FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present invention.

第2圖為本發明實施例一傳送裝置的示意圖。 FIG. 2 is a schematic diagram of a transmitting device according to a first embodiment of the present invention.

第3圖為本發明實施例一控制電路的示意圖。 FIG. 3 is a schematic diagram of a control circuit according to an embodiment of the present invention.

第4圖為本發明實施例一傳送電路的示意圖。 FIG. 4 is a schematic diagram of a transmission circuit according to a first embodiment of the present invention.

第5圖為本發明實施例一回饋電路的示意圖。 FIG. 5 is a schematic diagram of a feedback circuit according to an embodiment of the present invention.

第6圖為本發明實施例一功率頻譜密度的比較圖。 FIG. 6 is a comparison diagram of power spectral density according to the first embodiment of the present invention.

第7圖為本發明實施例一功率頻譜密度的比較圖。 FIG. 7 is a comparison diagram of power spectral density according to the first embodiment of the present invention.

第8圖為本發明實施例一功率頻譜密度的比較圖。 FIG. 8 is a comparison diagram of power spectral density according to the first embodiment of the present invention.

第9圖為本發明實施例一流程的流程圖。 FIG. 9 is a flowchart of a process according to an embodiment of the present invention.

第1圖為本發明實施例一通訊系統10的示意圖。通訊系統10可為任何使用正交分頻多工(orthogonal frequency-division multiplexing，OFDM)技術(或稱為離散多頻調變(discrete multi-tone modulation，DMT)技術)的通訊系統，簡略地由一傳送端TX及一接收端RX所組成。在第1圖中，傳送端TX及接收端RX 是用來說明通訊系統10之架構。舉例來說，通訊系統10可為非對稱式數位用戶迴路(asymmetric digital subscriber line，ADSL)系統、電力通訊(power line communication，PLC)系統、同軸電纜的乙太網路(Ethernet over coax，EOC)等有線通訊系統。或者，通訊系統10可為藍芽(Bluetooth，BT)、無線區域網路(wireless local area network，WLAN)、數位視訊廣播(Digital Video Broadcasting，DVB)系統、長期演進(Long Term Evolution，LTE)系統及先進長期演進(LTE-advanced，LTE-A)系統、第五代(5th generation，5G)系統等無線通訊系統。此外，傳送端TX及接收端RX可設置於行動電話、筆記型電腦、個人電腦等裝置中，不限於此。 FIG. 1 is a schematic diagram of a communication system 10 according to an embodiment of the present invention. The communication system 10 may be any communication system using orthogonal frequency-division multiplexing (OFDM) technology (also known as discrete multi-tone modulation (DMT) technology). It consists of a transmitting end TX and a receiving end RX. In Figure 1, the transmitting end TX and the receiving end RX It is used to describe the structure of the communication system 10. For example, the communication system 10 may be an asymmetric digital subscriber line (ADSL) system, a power line communication (PLC) system, and an Ethernet over coax (EOC) coaxial cable. And other wired communication systems. Alternatively, the communication system 10 may be a Bluetooth (BT), a wireless local area network (WLAN), a Digital Video Broadcasting (DVB) system, or a Long Term Evolution (LTE) system. And wireless communication systems such as advanced long-term evolution (LTE-advanced, LTE-A) systems, and 5th generation (5G) systems. In addition, the transmitting end TX and the receiving end RX can be set in devices such as a mobile phone, a notebook computer, and a personal computer, and are not limited thereto.

第2圖為本發明實施例一傳送裝置20的示意圖，可用於第1圖的傳送端TX中，用來消除訊號干擾(signal interference)，例如不同類型的訊號的交互干擾。傳送裝置20包含有一傳送電路200、一放大器202、一傳送電路210、一放大器212、一回饋電路220及一控制電路230。詳細來說，傳送電路200用來處理基頻訊號xB[n](例如複數(complex)訊號)，以產生射頻訊號。傳送電路210用來處理基頻訊號xW[n]及輸入訊號yA[n]，以產生射頻訊號，其中射頻訊號的頻率wB及射頻訊號的頻率wW不相同。回饋電路220耦接於傳送電路210，用來處理射頻訊號及洩漏訊號(例如其加總訊號的放大訊號)，以產生誤差訊號e[n]，其中洩漏訊號相關於射頻訊號。控制電路230耦接於傳送電路200、傳送電路210及回饋電路220，用來根據基頻訊號xB[n]及個誤差訊號e[n]，產生輸入訊號yA[n]。放大器202耦接於傳送電路200，以及放大器212耦接於傳送電路210及回饋電路220之間。傳送裝置20可傳送經過放大器202處理射頻訊號所得的放大訊號yB,PO[n]，以及可傳送經過放大器212處理射頻訊號及洩漏訊號的加總訊號所得的放大訊號yW,PO[n]。 在本實施例中，索引n的範圍可介於0~N-1之間，其中N皆為正整數。此外，假設傳送電路200及傳送電路210間存在一衰減增益g，可獲得洩漏訊號。 FIG. 2 is a schematic diagram of a transmitting device 20 according to an embodiment of the present invention, which can be used in the transmitting end TX of FIG. 1 to eliminate signal interference, such as mutual interference of different types of signals. The transmitting device 20 includes a transmitting circuit 200, an amplifier 202, a transmitting circuit 210, an amplifier 212, a feedback circuit 220, and a control circuit 230. In detail, the transmission circuit 200 is used to process the baseband signal x B [n] (such as a complex signal) to generate a radio frequency signal. . The transmission circuit 210 is used to process the baseband signal x W [n] and the input signal y A [n] to generate a radio frequency signal Of which the radio frequency signal Frequency w B and RF signal The frequency w W is not the same. The feedback circuit 220 is coupled to the transmission circuit 210 and is used for processing radio frequency signals. And leak signals (Such as its amplified signal by adding signals) to produce an error signal e [n], where the signal is leaking Related to RF signals . The control circuit 230 is coupled to the transmission circuit 200, the transmission circuit 210, and the feedback circuit 220, and is configured to generate an input signal y A [n] according to a base frequency signal x B [n] and an error signal e [n]. The amplifier 202 is coupled to the transmission circuit 200, and the amplifier 212 is coupled between the transmission circuit 210 and the feedback circuit 220. The transmitting device 20 can transmit the RF signal processed by the amplifier 202 The resulting amplified signal y B, PO [n], and can be transmitted to the RF signal processed by the amplifier 212 And leak signals The amplified signal y W, PO [n] obtained by adding the signals of. In this embodiment, the index n can range from 0 to N-1, where N is a positive integer. In addition, if there is an attenuation gain g between the transmission circuit 200 and the transmission circuit 210, a leakage signal can be obtained. .

根據習知技術，當基頻訊號xB[n]及基頻訊號xW[n]同時被傳送時，洩漏訊號會對射頻訊號造成干擾，不僅影響射頻訊號的傳輸，也違反傳輸規範。根據本發明，透過回饋電路220及控制電路230的使用，可在大幅消除洩漏訊號的同時，維持射頻訊號的完整性。 According to the conventional technology, when the baseband signal x B [n] and the baseband signal x W [n] are transmitted at the same time, the leaked signal RF signal Cause interference, not only affect RF signals Transmission also violates transmission specifications. According to the present invention, by using the feedback circuit 220 and the control circuit 230, leakage signals can be largely eliminated. While maintaining RF signals Integrity.

第3圖為本發明實施例一控制電路30的示意圖，可用於第2圖的傳送裝置20中，用來實現控制電路230。控制電路30包含有一數位移頻電路(Digital Frequency Shifting，DFS)300及一估測電路302。詳細來說，數位移頻電路300耦接於傳送電路200，用來根據頻率wB及頻率wW，處理基頻訊號xB[n]，以產生移頻訊號。估測電路302，耦接於數位移頻電路300、傳送電路210及回饋電路220，處理移頻訊號及誤差訊號e[n]，以產生輸入訊號yA[n]，其中誤差訊號e[n]相關於洩漏訊號及射頻訊號。 FIG. 3 is a schematic diagram of a control circuit 30 according to an embodiment of the present invention, which can be used in the transmitting device 20 of FIG. 2 to implement the control circuit 230. The control circuit 30 includes a digital frequency shifting (DFS) 300 and an estimation circuit 302. In detail, the digital shift frequency circuit 300 is coupled to the transmission circuit 200 and is configured to process the base frequency signal x B [n] according to the frequency w B and the frequency w W to generate a frequency shift signal. . The estimation circuit 302 is coupled to the digital frequency shift circuit 300, the transmission circuit 210, and the feedback circuit 220, and processes the frequency shift signal. And the error signal e [n] to generate the input signal y A [n], where the error signal e [n] is related to the leak signal And RF signals .

根據第3圖，在一實施例中，當傳送電路210處理移頻訊號以獲得處理的訊號時，該處理的訊號的頻率與頻率wB相同。在一實施例中，根據一修正的歸一化最小均方(modified normalized least mean square，modified NLMS)濾波器演算法，估測電路302處理移頻訊號及誤差訊號e[n]。在一實施例中，根據修正的歸一化最小均方濾波器演算法，誤差訊號e[n]根據以下方程式被定義：；以及 ê[n|n+1]=e[n|n+1]-e[n-1|n+1] (式1) According to FIG. 3, in an embodiment, when the transmission circuit 210 processes a frequency shift signal, When a processed signal is obtained, the frequency of the processed signal is the same as the frequency w B. In an embodiment, the estimation circuit 302 processes the frequency shift signal according to a modified normalized least mean square (modified NLMS) filter algorithm. And error signal e [n]. In one embodiment, according to the modified normalized minimum mean square filter algorithm, the error signal e [n] is defined according to the following equation: ; And ê [n | n + 1] = e [n | n + 1] -e [n-1 | n + 1] (Eq. 1)

其中，x n為修正的歸一化最小均方濾波器演算法的輸入向量，w k為修正的歸一化最小均方濾波器演算法的權重向量，以及d[n]為洩漏訊號()。 Where x n is the input vector of the modified normalized minimum mean square filter algorithm, w k is the weight vector of the modified normalized minimum mean square filter algorithm, and d [n] is the leak signal ( ).

第4圖為本發明實施例一傳送電路40的示意圖，可用於第2圖的傳送裝置20中，用來實現傳送電路200或傳送電路210。傳送電路40包含有一升取樣器(upsampler)400、一低通濾波器(low-pass filter，LPF)402、一混頻器(mixer)404、一升取樣器410、一低通濾波器412及一混頻器414。詳細來說，當傳送電路40用來實現傳送電路200時，升取樣器400及410處理基頻訊號xB[n]=xB,I[n]+jxB,Q[n]，以產生取樣訊號xB,S[n]=xB,S,I[n]+jxB,S,Q[n]。低通濾波器402及412分別耦接於升取樣器400及410，用來過濾升取樣訊號xB,S[n]，以產生過濾訊號xB,F[n]=xB,F,I[n]+jxB,F,Q[n]。混頻器404及414分別耦接於低通濾波器402及412，用來根據頻率wB，混頻過濾訊號xB,F[n]，以產生射頻訊號。 FIG. 4 is a schematic diagram of a transmission circuit 40 according to a first embodiment of the present invention, which can be used in the transmission device 20 of FIG. 2 to implement the transmission circuit 200 or the transmission circuit 210. The transmission circuit 40 includes a liter sampler (upsampler) 400, a low-pass filter (LPF) 402, a mixer 404, a liter sampler 410, a low-pass filter 412, and A mixer 414. In detail, when the transmission circuit 40 is used to implement the transmission circuit 200, the up-samplers 400 and 410 process the baseband signal x B [n] = x B, I [n] + jx B, Q [n] to generate Sampling signal x B, S [n] = x B, S, I [n] + jx B, S, Q [n]. The low-pass filters 402 and 412 are respectively coupled to the up-samplers 400 and 410, and are used to filter the up-sampled signals x B, S [n] to generate filtered signals x B, F [n] = x B, F, I [n] + jx B, F, Q [n]. The mixers 404 and 414 are respectively coupled to the low-pass filters 402 and 412, and are used to filter the signal x B, F [n] according to the frequency w B to generate a radio frequency signal. .

相似地，當傳送電路40用來實現傳送電路210時，升取樣器400及410處理基頻訊號xW[n]=xW,I[n]+jxW,Q[n]，以產生取樣訊號xW,S[n]=xW,S,I[n]+jxW,S,Q[n]。低通濾波器402及412分別耦接於升取樣器400及410，用來過濾升取樣訊號xW,S[n]，以產生過濾訊號xW,F[n]=xW,F,I[n]+jxW,F,Q[n]。混頻器404及414分別耦接於低通濾波器402及412，用來根據頻率wW，混頻過濾訊號xW,F[n]，以產生射頻訊號。 Similarly, when the transmission circuit 40 is used to implement the transmission circuit 210, the up-samplers 400 and 410 process the baseband signal x W [n] = x W, I [n] + jx W, Q [n] to generate samples Signal x W, S [n] = x W, S, I [n] + jx W, S, Q [n]. The low-pass filters 402 and 412 are respectively coupled to the up-samplers 400 and 410, and are used to filter the up-sampled signals x W, S [n] to generate filtered signals x W, F [n] = x W, F, I [n] + jx W, F, Q [n]. The mixers 404 and 414 are coupled to the low-pass filters 402 and 412, respectively, and are used to filter the signal x W, F [n] according to the frequency w W to generate a radio frequency signal. .

第5圖為本發明實施例一回饋電路50的示意圖，可用於第2圖的傳送裝置20中，用來實現回饋電路220。回饋電路50包含有一降取樣器(decimator) 500、一低通濾波器502、一混頻器504、一降取樣器510、一低通濾波器512及一混頻器514。詳細來說，混頻器504及514用來根據頻率wW，混頻射頻訊號及洩漏訊號的加總訊號(或其放大訊號yW,PO[n])，以產生混頻訊號xM[n]=xM,I[n]+jxM,Q[n]。低通濾波器502及512分別耦接於混頻器504及514，用來過濾混頻訊號xM[n]，以產生過濾訊號xM,F[n]=xM,F,I[n]+jxM,F,Q[n]。降取樣器500及510分別耦接於低通濾波器502及512，用來處理過濾訊號xM,F[n]，以產生誤差訊號e[n]。 FIG. 5 is a schematic diagram of a feedback circuit 50 according to an embodiment of the present invention, which can be used in the transmission device 20 of FIG. 2 to implement the feedback circuit 220. The feedback circuit 50 includes a decimator 500, a low-pass filter 502, a mixer 504, a down-sampler 510, a low-pass filter 512, and a mixer 514. In detail, the mixers 504 and 514 are used to mix the RF signals according to the frequency w W And leak signals Sum the signals (or their amplified signals y W, PO [n]) to produce a mixed signal x M [n] = x M, I [n] + jx M, Q [n]. Low-pass filters 502 and 512 are coupled to mixers 504 and 514, respectively, and are used to filter the mixed signal x M [n] to generate a filtered signal x M, F [n] = x M, F, I [n ] + jx M, F, Q [n]. The down-samplers 500 and 510 are coupled to the low-pass filters 502 and 512, respectively, and are used to process the filtering signals x M, F [n] to generate an error signal e [n].

在一實施例中，基頻訊號xB[n]為藍芽訊號，以及基頻訊號xW[n]為無線區域網路訊號，但不限於此。本領域具通常知識者可將本發明應用於同時傳送多種訊號的傳送端，以解決訊號干擾的問題。 In one embodiment, the baseband signal x B [n] is a Bluetooth signal, and the baseband signal x W [n] is a wireless local area network signal, but is not limited thereto. Those with ordinary knowledge in the art can apply the present invention to a transmitting end transmitting multiple signals at the same time to solve the problem of signal interference.

根據以上所述，以下根據傳送裝置20，以藍芽及無線區域網路為例，舉例說明本發明一實施例，其中以BT及WLAN分別表示藍芽及無線區域網路以改善陳述的明確性。 Based on the above, the following uses Bluetooth and wireless local area network as an example to illustrate an embodiment of the present invention according to the transmission device 20, in which BT and WLAN represent the Bluetooth and wireless local area network respectively to improve the clarity of the statement. .

首先，分別定義傳送電路200的BT基頻訊號及傳送電路210的WLAN基頻訊號如下：xB[n]=xB,I[n]+jxB,Q[n]；以及xW[n]=xW,I[n]+jxW,Q[n] (式2) First, the BT baseband signal of the transmission circuit 200 and the WLAN baseband signal of the transmission circuit 210 are defined as follows: x B [n] = x B, I [n] + jx B, Q [n]; and x W [n ] = x W, I [n] + jx W, Q [n] (Eq. 2)

其中xB,I[n]及xB,Q[n]分別為BT基頻訊號的實部訊號與虛部訊號，以及xW,I[n]及xW,Q[n]分別為WLAN基頻訊號的實部訊號與虛部訊號。接著，BT基頻訊號及WLAN基頻訊號分別經過對應的升取樣運作(例如升取樣器及低通濾波器)後，再以分別以對應的射頻頻率(radio frequency)進行升頻運作(即調 變)，成為BT射頻訊號及WLAN射頻訊號，其可分別表示如下：；以及 Where x B, I [n] and x B, Q [n] are the real and imaginary signals of the BT baseband signal, and x W, I [n] and x W, Q [n] are WLAN respectively The real and imaginary signals of the baseband signal. Then, after the BT baseband signal and the WLAN baseband signal are respectively subjected to corresponding upsampling operations (such as upsampling and low-pass filters), the upsampling operation is performed at the corresponding radio frequency (i.e. Change), become BT radio frequency signal And WLAN RF signals , Which can be expressed as follows: ;as well as

其中wB及wW分別為BT及WLAN的(例如不同)射頻頻率(即載波頻率)，以及θB和θW則分別為BT及WLAN的混頻器的(例如不同)相位。 Wherein w B and w W are (eg, different) RF frequencies (ie, carrier frequencies) of BT and WLAN, and θ B and θ W are (eg, different) phases of BT and WLAN mixers, respectively.

由於BT射頻訊號會對WLAN射頻訊號造成干擾，考慮BT及WLAN間路徑的衰減增益g後，可將BT洩漏訊號表示為： Due to BT radio frequency signal WLAN RF signal Causes interference, considering the attenuation gain g of the path between BT and WLAN, the BT leakage signal can be Expressed as:

在本發明中，假設放大器212具有三階的非線性模型，可表示經放大器212處理所得的放大訊號如下： In the present invention, it is assumed that the amplifier 212 has a third-order non-linear model, which can indicate that the amplified signal obtained by the processing of the amplifier 212 is as follows:

其中a1和a3分別為放大器212的一階係數及三階係數。根據(式5)可知，在放大器的非線性模型的影響下，WLAN射頻訊號及BT洩漏訊號的相加會產生互調的干擾訊號S1和S2。 Where a 1 and a 3 are first-order coefficients and third-order coefficients of the amplifier 212, respectively. According to (Eq. 5), under the influence of the nonlinear model of the amplifier, the WLAN radio frequency signal And BT leak signal Addition of the interfering signals will produce intermodulation interference signals S 1 and S 2 .

以下以兩個部分說明本發明一控制電路實施例。首先，說明控制電路的架構及運作方式。詳細來說，控制電路包含有數位移頻電路及估測電路。舉例來說，估測電路為執行適應性演算法的適應性濾波器，其中適應性演算法 可為一歸一化最小均方濾波器演算法，但不限於此。適應性演算法的相關參數及估測電路的三個運算訊號：期望訊號(desired signal)、估測電路輸出訊號及誤差訊號會在接下來段落中被定義。接著，以修正的歸一化最小均方濾波器演算法進一步改善估測電路的效能。 The following describes an embodiment of a control circuit of the present invention in two parts. First, the structure and operation of the control circuit will be described. In detail, the control circuit includes a digital shift frequency circuit and an estimation circuit. For example, the estimation circuit is an adaptive filter that performs an adaptive algorithm, where the adaptive algorithm It can be a normalized minimum mean square filter algorithm, but it is not limited to this. The relevant parameters of the adaptive algorithm and the three operational signals of the estimation circuit: the desired signal, the output signal of the estimation circuit, and the error signal will be defined in the following paragraphs. Then, the performance of the estimation circuit is further improved with a modified normalized minimum mean square filter algorithm.

考慮BT的射頻頻率wB及WLAN的射頻頻率wW不相同，本發明先以數位移頻電路處理BT基頻訊號xB[n]。詳細來說，根據射頻頻率wB及ww，數位移頻電路將BT基頻訊號xB[n]移到頻率(wB-wW)，以獲得移頻訊號。因此，移頻訊號經過WLAN的升頻運作後，所造成的訊號的頻率可與BT洩漏訊號的頻率相同。定義經過適應性濾波器處理移頻訊號所得的訊號為：yA[n]=yA,I[n]+jyA,Q[n] (式6) Considering that the radio frequency w B of BT and the radio frequency w W of WLAN are different, the present invention first uses a digital shift frequency circuit to process the BT base frequency signal x B [n]. In detail, according to the RF frequencies w B and w w , the digital shift frequency circuit shifts the BT base frequency signal x B [n] to the frequency (w B -w W ) to obtain a frequency shift signal. . So the frequency shift signal After the up-scaling operation of WLAN, the frequency of the resulting signal can be compared with the BT leakage signal. The same frequency. Defines frequency-shifted signals processed by adaptive filters The resulting signal is: y A [n] = y A, I [n] + jy A, Q [n] (Eq. 6)

接著，對訊號yA[n]及WLAN基頻訊號xW[n]的加總訊號執行WLAN的升取樣運作及升頻運作後，可產生WLAN射頻訊號。 Then, the WLAN upsampling operation and the upsampling operation are performed on the sum signal of the signal y A [n] and the WLAN base frequency signal x W [n] to generate a WLAN radio frequency signal. .

根據估測電路的運作，期望訊號可為BT洩漏訊號。誤差訊號(即放大器212的輸入訊號)相關於(或可被視為)期望訊號及WLAN射頻訊號的總和。 According to the operation of the estimated circuit, the expected signal can be a BT leak signal . The error signal (i.e. the input signal of the amplifier 212) is related to (or can be considered as) the desired signal And WLAN RF signals Sum.

根據以上所述，放大器212的輸入訊號經過放大器212，再經過回饋路徑後，可提供給疊代運作來計算合適的估測電路參數。經由本架構之設計，估測電路對進入放大器212前的BT洩漏訊號進行消除運作，以降低放大器212所輸出的干擾訊號。 According to the above, after the input signal of the amplifier 212 passes the amplifier 212 and then passes through the feedback path, it can be provided to the iterative operation to calculate the appropriate estimated circuit parameters. Based on the design of this architecture, the circuit estimates the BT leakage signal before entering the amplifier 212 A cancellation operation is performed to reduce the interference signal output by the amplifier 212.

需注意的是，若估測電路所使用的適應性演算法為習知歸一化最小均方濾波器演算法，上述設計雖可大幅消除BT洩漏訊號，但也消除WLAN基頻訊號xW[n]的小部分訊號，減少了效能改善的幅度。因此，本發明以一修正的歸一化最小均方濾波器演算法來改善WLAN基頻訊號xW[n]的衰減。 It should be noted that if the adaptive algorithm used in the estimation circuit is a conventionally normalized minimum mean square filter algorithm, the above design can greatly eliminate the BT leakage signal. , But it also eliminates a small part of the signal of the WLAN baseband signal x W [n], reducing the extent of performance improvement. Therefore, the present invention uses a modified normalized minimum mean square filter algorithm to improve the attenuation of the WLAN fundamental frequency signal x W [n].

首先，定義適應性演算法的兩個錯誤項(估測電路誤差訊號)如下： First, the two error terms (estimated circuit error signal) of the adaptive algorithm are defined as follows:

其中為適應性演算法的輸入向量，w n=[wn[0],wn[1],...,wn[L-1]]T為適應性演算法的權重向量，以及期望訊號(即BT洩漏訊號)。 among them Is the input vector of the adaptive algorithm, w n = [w n [0], w n [1], ..., w n [L-1]] T is the weight vector of the adaptive algorithm and the expected signal (I.e. BT leak signal ) .

接著，定義及為差異項。根據最小平均平方誤差(Minimum Mean Square Error，MMSE)的準則，考慮以下兩 Next, define and Is the difference term. According to the Minimum Mean Square Error (MMSE) criterion, consider the following two

為了解決上述方程式，定義△w n+1=w n+1-w n，以及根據Lagrange乘數法來定義以下的成本函數(cost function)： To solve the above equation, define Δ w n + 1 = w n + 1 - w n , and define the following cost function according to the Lagrange multiplier method:

其中，λ為複數的Lagrange乘數。接著，對成本函數做的偏微分，以及假設結果為0，則可得到： Among them, λ is a Lagrange multiplier of a complex number. Next, do the cost function Partial differential of, and assuming the result is 0, you can get:

將(式13)代入(式10)，可以導出複數的Lagrange乘數λ如下： Substituting (Equation 13) into (Equation 10), a complex Lagrange multiplier λ can be derived as follows:

接著，將Lagrange乘數λ輸入(式13)，新增α為適應性參數(即步進參數)，以及新增一個很小的正值c值來避免為0所造成的演算法異常，可得到下列方程式： Next, enter Lagrange multiplier λ (Equation 13), add α as the adaptive parameter (ie, step parameter), and add a small positive value of c to avoid The algorithm abnormality caused by 0 can get the following equation:

需注意的是，雖然可將期望訊號視為BT洩漏訊號，但實際上，無法直接取得d[n]的真正數值，使(式15)式中ê*[n|n]無法由(式7)和(式8)來獲得。因此，本發明提供了一個解決方案，以ê*[n]-ê*[n-1]來近似ê*[n|n]。(式15)可據以被修改如下式： It should be noted that although the desired signal can be regarded as a BT leak signal However, in fact, the true value of d [n] cannot be obtained directly, so that ê * [n | n] in (Equation 15) cannot be obtained from (Equation 7) and (Equation 8). Therefore, the present invention provides a solution to approximate ê * [n | n] with ê * [n] -ê * [n-1]. (Eq. 15) can be modified as follows:

隨著疊代(iteration)次數的增加，可提高上述近似的準確度。原因為當疊代次數增加時，參數將逐漸收斂，使將越來越接近，計算結果將越來越精確。 As the number of iterations increases, the accuracy of the above approximation can be improved. The reason is that when the number of iterations increases, the parameters will gradually converge, so that Will get closer The calculation results will become more and more accurate.

第6圖為本發明實施例一功率頻譜密度(power spectrum density，PSD)的比較圖。第6圖繪示有歸一化最小均方濾波器演算法及修正的歸一化最小均方濾波器演算法的輸入訊號yA[n]的功率頻譜密度，其中“NLMS”表示歸一化最小均方濾波器演算法的結果，以及“Modified NLMS”表示修正的歸一化最小均方濾波器演算法的結果。輸入訊號yA[n]在WLAN傳輸路徑以反向(負值)的方式被加入，用於消除BT洩漏訊號。因此，此處輸出的BT訊號越相似於 BT洩漏訊號，則干擾消除的結果越佳。在第6圖中，經過歸一化最小均方濾波器演算法的結果為-62.64dBm/Hz，修正的歸一化最小均方濾波器演算法的結果為-62.62dBm/Hz，以及實際的BT洩漏干擾訊號則為-63.63dBm/Hz。值得注意的是中間頻率的結果，這個區域若存在有訊號，該訊號會對WLAN訊號造成干擾。 根據第6圖，歸一化最小均方濾波器演算法的結果為-88.63dBm/Hz，以及修正的歸一化最小均方濾波器演算法的結果為-113dBm/Hz。因此，修正的歸一化最小均方濾波器演算法確實可減少干擾量的產生，使WLAN訊號的品質受到較少的影響。 FIG. 6 is a comparison diagram of power spectrum density (PSD) according to the first embodiment of the present invention. Figure 6 shows the power spectral density of the input signal y A [n] with a normalized minimum mean square filter algorithm and a modified normalized minimum mean square filter algorithm, where "NLMS" means normalized The result of the minimum mean square filter algorithm, and "Modified NLMS" represents the result of the modified normalized minimum mean square filter algorithm. The input signal y A [n] is added in the reverse direction (negative value) on the WLAN transmission path to eliminate the BT leakage signal . Therefore, the more similar the BT signal output here is to the BT leak signal, the better the result of interference cancellation. In Figure 6, the result of the normalized minimum mean square filter algorithm is -62.64dBm / Hz, and the result of the modified normalized minimum mean square filter algorithm is -62.62dBm / Hz, and the actual The BT leakage interference signal is -63.63dBm / Hz. It is worth noting the result of the intermediate frequency. If there is a signal in this area, the signal will cause interference to the WLAN signal. According to Figure 6, the result of the normalized minimum mean square filter algorithm is -88.63 dBm / Hz, and the result of the modified normalized minimum mean square filter algorithm is -113 dBm / Hz. Therefore, the modified normalized minimum mean square filter algorithm can indeed reduce the amount of interference and make the quality of the WLAN signal less affected.

第7圖為本發明實施例一功率頻譜密度的比較圖。在第7圖中，不同消除干擾方法所造成放大器212的輸入訊號(+)會被比較：未消除BT洩漏訊號、使用歸一化最小均方濾波器演算法及修正的歸一化最小均方濾波器演算法。“Without Cancellation”表示未使用任何干擾消除的結果，“NLMS”表示歸一化最小均方濾波器演算法的結果，以及“Modified NLMS”表示修正的歸一化最小均方濾波器演算法的結果。上述三種方法所得到的結果分別為：-63.63dBm/Hz、-87.87dBm/Hz及-90.6dBm/Hz。比較上述差異後，可得到歸一化最小均方濾波器演算法及修正的歸一化最小均方濾波器演算法分別消除了24.24dB和26.97dB的干擾。 FIG. 7 is a comparison diagram of power spectral density according to the first embodiment of the present invention. In Figure 7, the input signal of the amplifier 212 ( + ) Will be compared: the BT leakage signal is not eliminated, the normalized minimum mean square filter algorithm is used, and the modified normalized minimum mean square filter algorithm is used. "Without Cancellation" indicates the result without any interference cancellation, "NLMS" indicates the result of the normalized minimum mean square filter algorithm, and "Modified NLMS" indicates the result of the modified normalized minimum mean square filter algorithm . The results obtained by the above three methods are: -63.63dBm / Hz, -87.87dBm / Hz, and -90.6dBm / Hz. After comparing the above differences, a normalized minimum mean square filter algorithm and a modified normalized minimum mean square filter algorithm are obtained to eliminate interference of 24.24dB and 26.97dB, respectively.

第8圖為本發明實施例一功率頻譜密度的比較圖。在第8圖中，不同消除干擾方法所造成放大器212的輸出訊號(yW,PO[n])會被比較，該結果也是最後會被量測出的實際結果：未消除BT洩漏訊號、使用歸一化最小均方濾波器演算法及修正的歸一化最小均方濾波器演算法。“Without Cancellation”表示未使用任何干擾消除的結果，“NLMS”表示歸一化最小均方濾波器演算法的結果， “Modified NLMS”表示修正的歸一化最小均方濾波器演算法的結果，“OOB”表示頻帶外(out-of-band)，以及“OOB Emission”表示頻帶外發射。上述三種方法所得到的結果分別為：-62.04dBm/Hz、-70.11dBm/Hz及-68.65dBm/Hz。比較上述差異後，可得到歸一化最小均方濾波器演算法及修正的歸一化最小均方濾波器演算法分別消除了8.07dB和6.61dB的干擾。 FIG. 8 is a comparison diagram of power spectral density according to the first embodiment of the present invention. In Figure 8, the output signal (y W, PO [n]) of the amplifier 212 caused by different interference cancellation methods will be compared. This result is also the actual result that will be measured finally: BT leakage signal is not eliminated, use Normalized minimum mean square filter algorithm and modified normalized minimum mean square filter algorithm. "Without Cancellation" indicates the result without using any interference cancellation, "NLMS" indicates the result of the normalized minimum mean square filter algorithm, and "Modified NLMS" indicates the result of the modified normalized minimum mean square filter algorithm, "OOB" means out-of-band, and "OOB Emission" means out-of-band transmission. The results obtained by the above three methods are: -62.04 dBm / Hz, -70.11 dBm / Hz, and -68.65 dBm / Hz. After comparing the above differences, a normalized minimum mean square filter algorithm and a modified normalized minimum mean square filter algorithm are obtained to eliminate interference of 8.07dB and 6.61dB, respectively.

第9圖為本發明實施例一流程90的流程圖，用來說明前述傳送裝置20的運作方式，其包含有以下步驟：步驟900：開始。 FIG. 9 is a flowchart of a process 90 according to an embodiment of the present invention, which is used to describe the operation mode of the aforementioned transmitting device 20, and includes the following steps: Step 900: Start.

步驟902：處理第一複數個基頻訊號，以產生第一複數個射頻訊號。 Step 902: Process the first plurality of base frequency signals to generate a first plurality of radio frequency signals.

步驟904：處理第二複數個基頻訊號及複數個輸入訊號，以產生第二複數個射頻訊號，其中該第一複數個射頻訊號的一第一頻率及該第二複數個射頻訊號的一第二頻率不相同。 Step 904: Process the second plurality of base frequency signals and the plurality of input signals to generate a second plurality of radio frequency signals, wherein a first frequency of the first plurality of radio frequency signals and a first frequency of the second plurality of radio frequency signals. The two frequencies are not the same.

步驟906：處理該第二複數個射頻訊號及複數個洩漏訊號，以產生複數個誤差訊號，其中該複數個洩漏訊號相關於該第一複數個射頻訊號。 Step 906: Process the second plurality of radio frequency signals and the plurality of leakage signals to generate a plurality of error signals, wherein the plurality of leakage signals are related to the first plurality of radio frequency signals.

步驟908：根據該第一複數個基頻訊號及該複數個誤差訊號，產生該複數個輸入訊號。 Step 908: Generate the plurality of input signals according to the first plurality of base frequency signals and the plurality of error signals.

步驟910：結束。 Step 910: End.

需注意的是，可根據設計考量或系統需求，將傳送電路200、放大器202、傳送電路210、放大器212、回饋電路220及控制電路230整合為一或多個電路。此外，傳送裝置20及其中電路可以硬體、軟體、韌體、電子系統、或上述裝置的組合來實現，不限於此。 It should be noted that the transmission circuit 200, the amplifier 202, the transmission circuit 210, the amplifier 212, the feedback circuit 220, and the control circuit 230 may be integrated into one or more circuits according to design considerations or system requirements. In addition, the transmitting device 20 and the circuits therein may be implemented by hardware, software, firmware, electronic system, or a combination of the above devices, and is not limited thereto.

綜上所述，本發明提供了一種裝置及其方法，透過使用回饋電路及控制電路的使用，可降低同時傳送不同類型訊號時所產生的訊號間干擾。相較於習知技術，本發明不僅具有較佳的效能，也具有較低的成本。以上所述僅為本發明之較佳實施例，凡依本發明申請專利範圍所做之均等變化與修飾，皆應屬本發明之涵蓋範圍。 In summary, the present invention provides a device and a method thereof. By using the feedback circuit and the control circuit, interference between signals generated when different types of signals are transmitted at the same time can be reduced. Compared with the conventional technology, the present invention not only has better performance, but also has lower cost. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

Claims (10)

一種傳送裝置，用來處理訊號干擾，包含有：一第一傳送電路，用來處理第一複數個基頻訊號，以產生第一複數個射頻訊號；一第二傳送電路，用來處理第二複數個基頻訊號及複數個輸入訊號，以產生第二複數個射頻訊號，其中該第一複數個射頻訊號的一第一頻率及該第二複數個射頻訊號的一第二頻率不相同；一回饋電路，耦接於該第二傳送電路，用來處理該第二複數個射頻訊號及複數個洩漏訊號，以產生複數個誤差訊號，其中該複數個洩漏訊號相關於該第一複數個射頻訊號；以及一控制電路，耦接於該第一傳送電路、該第二傳送電路及該回饋電路，用來根據該第一複數個基頻訊號及該複數個誤差訊號，產生該複數個輸入訊號。A transmission device for processing signal interference includes: a first transmission circuit for processing a first plurality of baseband signals to generate a first plurality of radio frequency signals; a second transmission circuit for processing a second The plurality of base frequency signals and the plurality of input signals to generate a second plurality of radio frequency signals, wherein a first frequency of the first plurality of radio frequency signals and a second frequency of the second plurality of radio frequency signals are different; A feedback circuit is coupled to the second transmission circuit and is used to process the second plurality of radio frequency signals and the plurality of leakage signals to generate a plurality of error signals, wherein the plurality of leakage signals are related to the first plurality of radio frequency signals. And a control circuit coupled to the first transmission circuit, the second transmission circuit, and the feedback circuit to generate the plurality of input signals according to the first plurality of base frequency signals and the plurality of error signals. 如請求項1所述的傳送裝置，其中該控制電路包含有：一數位移頻電路，耦接於該第一傳送電路，用來根據該第一頻率及該第二頻率，處理該第一複數個基頻訊號，以產生複數個移頻訊號；以及一估測電路，耦接於該數位移頻電路、該第二傳送電路及該回饋電路，用來處理該複數個移頻訊號及該複數個誤差訊號，以產生該複數個輸入訊號，其中該複數個誤差訊號相關於該複數個洩漏訊號及該第二複數個射頻訊號。The transmission device according to claim 1, wherein the control circuit includes a digital shift frequency circuit coupled to the first transmission circuit for processing the first complex number according to the first frequency and the second frequency. Base frequency signals to generate a plurality of frequency shifted signals; and an estimation circuit coupled to the number shifted frequency circuit, the second transmission circuit and the feedback circuit for processing the plurality of frequency shifted signals and the complex number Error signals to generate the plurality of input signals, wherein the plurality of error signals are related to the plurality of leakage signals and the second plurality of radio frequency signals. 如請求項2所述的傳送裝置，其中當該第二傳送電路處理該複數個移頻訊號以獲得複數個處理的訊號時，該複數個處理的訊號的一第三頻率與該第一頻率相同。The transmission device according to claim 2, wherein when the second transmission circuit processes the plurality of frequency-shifted signals to obtain the plurality of processed signals, a third frequency of the plurality of processed signals is the same as the first frequency . 如請求項2所述的傳送裝置，其中根據一修正的歸一化最小均方(modified normalized least mean square，modified NLMS)濾波器演算法，該估測電路處理該複數個移頻訊號及該複數個誤差訊號。The transmission device according to claim 2, wherein the estimation circuit processes the plurality of frequency shift signals and the complex number according to a modified normalized least mean square (modified NLMS) filter algorithm. Error signals. 如請求項4所述的傳送裝置，其中根據該修正的歸一化最小均方濾波器演算法，該複數個誤差訊號根據以下方程式被定義：；以及ê[n|n+1]=e[n|n+1]-e[n-1|n+1]；其中，x n為該修正的歸一化最小均方濾波器演算法的一輸入向量，w k為該修正的歸一化最小均方濾波器演算法的一權重向量，以及d[n]為該複數個洩漏訊號。The transmission device according to claim 4, wherein according to the modified normalized minimum mean square filter algorithm, the plurality of error signals are defined according to the following equation: ; And ê [n | n + 1] = e [n | n + 1] -e [n-1 | n + 1]; where x n is the value of the modified normalized minimum mean square filter algorithm An input vector, w k is a weight vector of the modified normalized minimum mean square filter algorithm, and d [n] is the plurality of leakage signals. 如請求項1所述的傳送裝置，其中該第一傳送電路包含有：第一複數個升取樣器，用來處理該第一複數個基頻訊號，以產生第一複數個升取樣訊號；第一複數個低通濾波器，耦接於該第一複數個升取樣器，用來過濾該第一複數個升取樣訊號，以產生第一複數個過濾訊號；以及第一複數個混頻器，耦接於該第一複數個低通濾波器，用來根據該第一頻率，混頻該第一複數個過濾訊號，以產生該第一複數個射頻訊號。The transmission device according to claim 1, wherein the first transmission circuit includes: a first plurality of up-samplers for processing the first plurality of base-frequency signals to generate a first plurality of up-sampled signals; A plurality of low-pass filters, coupled to the first plurality of up-samplers, for filtering the first plurality of up-sampled signals to generate a first plurality of filtered signals; and a first plurality of mixers, The first plurality of low-pass filters are coupled to mix the first plurality of filtering signals according to the first frequency to generate the first plurality of radio frequency signals. 如請求項1所述的傳送裝置，其中該第二傳送電路包含有：第二複數個升取樣器，用來處理該第二複數個基頻訊號，以產生第二複數個升取樣訊號；第二複數個低通濾波器，耦接於該第二複數個升取樣器，用來過濾該第二複數個升取樣訊號，以產生第二複數個過濾訊號；以及第二複數個混頻器，耦接於該第二複數個低通濾波器，用來根據該第二頻率，混頻該第二複數個過濾訊號，以產生該第二複數個射頻訊號。The transmission device according to claim 1, wherein the second transmission circuit includes: a second plurality of up-samplers for processing the second plurality of base-frequency signals to generate a second plurality of up-sampled signals; Two or more low-pass filters, coupled to the second plurality of up-samplers, for filtering the second plurality of up-sampled signals to generate a second plurality of filtered signals; and a second plurality of mixers, The second plurality of low-pass filters are coupled to mix the second plurality of filtering signals according to the second frequency to generate the second plurality of radio frequency signals. 如請求項1所述的傳送裝置，其中透過一放大器，該回饋電路耦接於該第二傳送電路。The transmission device according to claim 1, wherein the feedback circuit is coupled to the second transmission circuit through an amplifier. 如請求項1所述的傳送裝置，其中該回饋電路包含有：第三複數個混頻器，用來根據該第二頻率，用來混頻該第二複數個射頻訊號及該複數個洩漏訊號，以產生複數個混頻訊號；第三複數個低通濾波器，耦接於該第三複數個混頻器，用來過濾該複數個混頻訊號，以產生複數個過濾訊號；以及複數個降取樣器，耦接於該第三複數個低通濾波器，用來處理該複數個過濾訊號，以產生該複數個誤差訊號。The transmission device according to claim 1, wherein the feedback circuit includes: a third plurality of mixers for mixing the second plurality of radio frequency signals and the plurality of leakage signals according to the second frequency. To generate a plurality of mixing signals; a third plurality of low-pass filters, coupled to the third plurality of mixers, for filtering the plurality of mixing signals to generate a plurality of filtering signals; and a plurality of filtering signals; and The down-sampler is coupled to the third plurality of low-pass filters and is used to process the plurality of filtering signals to generate the plurality of error signals. 如請求項1所述的傳送裝置，其中該第一複數個基頻訊號為藍芽(Bluetooth)訊號，以及該第二複數個基頻訊號為無線區域網路(wireless local area network，WLAN)訊號。The transmitting device according to claim 1, wherein the first plurality of fundamental frequency signals are Bluetooth signals, and the second plurality of fundamental frequency signals are wireless local area network (WLAN) signals .
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