CN100417036C - Message machine of receiving-transmitting time-division duplex wireless communication system - Google Patents

Message machine of receiving-transmitting time-division duplex wireless communication system Download PDF

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CN100417036C
CN100417036C CNB2004100307393A CN200410030739A CN100417036C CN 100417036 C CN100417036 C CN 100417036C CN B2004100307393 A CNB2004100307393 A CN B2004100307393A CN 200410030739 A CN200410030739 A CN 200410030739A CN 100417036 C CN100417036 C CN 100417036C
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switch
connected
mixer
receiving
common
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CN1677882A (en
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滔 段
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大唐移动通信设备有限公司
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Abstract

本发明提供了一种时分双工无线通信系统收发信机,该收发信机包括一天线和基带处理单元,以及连接天线与基带处理单元的发射电路和接收电路,该发射电路和接收电路通过切换开关共同电连接双向共用射频滤波器、一双向混频器和可调衰减器器件,实现发射电路与接收电路对这些器件的共用,从而降低成本,节约功耗,有利于提高电路设计的集成度。 The present invention provides a time division duplex wireless communication system transceiver, the transceiver comprising an antenna and a baseband processing unit, and a transmission circuit and a receiving circuit connected to the antenna and the baseband processing unit, the transmitting and receiving circuits by the switching bidirectional switch electrically connected in common shared radio frequency filter, a mixer and a two-way adjustable attenuator means, to achieve a common transmitting circuit and the receiving circuit of these devices, thereby reducing costs, conserve power, help to improve the degree of integration of the circuit design .

Description

时分双工无线通信系统收发信机技术领域本发明涉及时分双工无线通信领域,尤其涉及时分双工无线通信系统收发信机。 BACKGROUND transceiver division duplex radio communication system of the present invention relates to wireless time division duplex communication field, and particularly to time division duplex wireless communication system transceiver. 背景技术时分双工(TDD)无线通信系统,是发射和接收使用同一个频率,只是利用不同的时间来区分基站信号和用户信号,也就是说,时分双工通信系统的工作方式,使得收信机和发信机工作频率相同,但是不同时工作。 BACKGROUND OF THE INVENTION Time Division Duplex (TDD) wireless communication system, a transmission and reception using the same frequency, but with different time base signal and to distinguish between user signals, that is, work division duplex communication system, such that the recipient the same frequency transmitter and machine work, but does not work at the same time. 现有的收发信机电路设计,参见图1和图2,发信机和收信机共享天线和基带电路,但是介于天线和基带电路之间的发射路径和接收路径是相互独立的两条链路,通过开关l或l,选通两条链路, 接通天线与发射电路或接收电路。 Conventional transceiver circuit design, see FIGS. 1 and 2, the transmitter and receiver circuits share an antenna and baseband, but between transmit and receive paths between the antenna and the baseband circuit is independent of the two link by the switch or l l, gating two links, switched antenna and the transmitting circuit or the receiving circuit. 图l中,接收电路和发射电路都分别包括一与分配器(SPLITTER)连接的混频器(2、 20)、与混频器连接的射频滤波器(3、 30)以及中频滤波器(4、 40)。 Figure l, the transmitting circuit and the receiving circuit respectively includes a mixer and a distributor (SPLITTER,) connected (2, 20), radio frequency filters (3, 30) connected to the mixer and IF filter (4 40). 图2 中,采用了数字中频(DIF)技术,对中频采样信号进行数字信号处理后直接输出基带IQ数字信号。 FIG 2 outputs directly, using a digital intermediate frequency (DIF) techniques, the IF signal is digitally sampled baseband IQ signal processing digital signals. 对于发射通路,接收基带IQ数字信号后经过数信号处理后,采用DUC(数字上变频),在DAC上直接输出模拟中频信号。 For the transmit path, the received base band IQ digital signal through the number of signal processing using the DUC (digital up-conversion) on an analog IF signal is directly output DAC. 相似地,接收电路和发射电路都分别包括一与分配器(SPLITTER)连接的混频器(2,、 20,)、与混频器连接的射频滤波器(3,、 30,)以及中频滤波器(4,、 40,)。 Similarly, the transmitting circuit and the receiving circuit respectively comprises a mixer (2 ,, 20,), radio frequency filters connected to the mixer (3 ,, 30,) and an IF filtering and a dispenser (SPLITTER,) connected (4 ,, 40,). 由此可见,现有技术中采用的收发电路中使用了具有相同功能的两组电子器件,如混频器、中频滤波器和射频滤波器。 Thus, transceiver circuitry employed in the prior art use of two sets of electronic devices having the same functions, such as mixers, RF filter and IF filter. 这些相同功能的电子器件增加了功率和成本,占用了电路板面积,不利于实现电路设计的高度集成化。 The same functions of these electronic devices increases the power and cost, board area occupied, is not conducive to a highly integrated circuit design. 在一般终端设计中还应用了一种发射信号路径和接收信号路径共用一个双向中频滤波器的收发信机,开关电路负责接通该双向中频滤波器到接收电路或发射电路。 In a typical application of the terminal design is also a transmit signal path and receive signal path share a bidirectional transceiver IF filter, the bidirectional switch circuit is turned IF filter is responsible to a receiving circuit or the transmitting circuit. 但是该收发信机中仅仅是对中频滤波器的共用,其混频器或其他器件没有共用。 However, the transceiver are merely common intermediate frequency filter, a mixer or other device which is not common. 其实,对于中频和射频滤波器, 一般都是双向的,可以直接用于收信机和发信机。 In fact, for the IF and RF filters, they are generally bi-directional, and can be used directly in the transmitter receiver. 实际上由图l可以看出,天线和射频开关中间是收发共用滤波器的, 对于时分双工系统,这种滤波器的共用的设计很普遍,只是需要合理的安排共用的位置。 In fact, can be seen from FIG. L, antennas and RF switch is a duplexer intermediate filter for the time division duplex system, the common design of such filters is common, but the need to share the location reasonable arrangements. 一般终端用的混频器由于要求较低,基本采用有源混频器,所以只能对于上变频或下变频采用不同的混频器。 General terminal used by requiring lower mixer, the basic use of an active mixer, so only to the lower frequency upconversion or different mixers. 因此,在一般终端中混频器不共用。 Thus, in general do not share mixer terminal. 并且, 一般终端增益调整用的可变增益放大器,调节范围大,指标要求低,特别是线性度,有方向性,也不能共用。 Further, the gain of the variable gain amplifier general terminal adjustment, the adjustment range, the indicator is low, especially linearity, directional, can not be shared. 收发信机共用器件,首先要求器件必须是双向的,而对于现有设计中的混频器和增益调节器,很多是有源的,单向的。 Common transceiver device, the first requirement of the device must be bidirectional, and conventional designs for mixers and gain adjuster, many active, unidirectional. 因此,这些器件通常不共用。 Thus, these devices typically do not share. 另外,收信机和发信机工作在不同频率上的通信系统中,如频分双工系统,发射电路上的混频器或其他器件在发射时的工作频率与接收电路上的混频器或其他器件在接收时的工作频率不同,无法方便地实现这些器件的共用。 Further, the transmitter and receiver operate at different frequencies in communication systems, such as frequency division duplex system, the transmit mixer and the operating frequency of the receiver mixer circuit or other devices on the circuit when the emission or other devices receiving different operating frequency can not be easily implemented to share these devices. 此外,射频滤波器,混频器,可调衰减器的价格都比较昂贵, 如果能使发射和接收电路共用这些器件,则可以降低成本,节约功耗,减少这些器件占用的电路板面积。 Further, RF filters, mixers, variable attenuators are relatively expensive price, if the transmission and reception circuit can share these devices, the cost can be reduced, saving power consumption, reduced board space occupied by these devices. 发明内容本发明的目的是提供一种时分双工无线通信系统收发信机, 该收发信机的发射电路和接收电路共用射频滤波器,混频器,可调衰减器器件,从而降低成本,节约功耗,减少这些器件占用的电路板面积。 Object of the present invention is to provide a radio communication system, a time division duplex transceiver, the transceiver transmitting and receiving circuits share RF filters, mixers, variable attenuator means, thereby reducing costs, savings power, reduced board space occupied by these devices. 本发明的时分双工无线通信系统收发信机实现方案是: 一种时分双工无线通信系统收发信机,其包括天线、基带处射电路和接收电路包I舌共用的第一切换开关,并且通过该第一切换开关连接天线,其特征在于,该发射电路和接收电路还包括共同电连接的双向混频器和一组在第一切换开关与混频器之间的第二切换开关;该发射电路和接收电路通过第二切换开关共同电连接共用射频滤波器,该共用射频滤波器连接在该第二切换开关与所述混频器之间;该发射电路包括顺序连接的与基带处理单元连接的调制器或数字调制器、发射中频滤波器(211)、发射中频放大器(212)、第三切换开关、混频器、共用射频滤波器、第二切换开关、发射可变增益放大器(213)、发射射频滤波器(214)、发射低噪声放大器(215)以及第一切换开关(003 ),其中,混频器还连接本振; The present invention is a time division duplex wireless communication system transceiver implementation is: a time division duplex wireless communication system transceiver, including an antenna, base band emission and reception circuits a first packet switch tongue common I and the antenna is connected through the first switch, wherein the transmitting and receiving circuits further comprises a bi-directional mixer and electrically connected to a common second group of switch between the first switch and the mixer; the transmitting and receiving circuits connected to a common radio frequency filter electrically together via a second switch, the common radio frequency filter connected between the second switch and the mixer; the baseband processing unit includes a transmitting circuit connected in sequence a variable gain amplifier connected to the modulator or a digital modulator, the transmit IF filter (211), a transmit intermediate frequency amplifier (212), a third switch, a mixer, a common radio frequency filter, the second switch, transmitting (213 ), transmit radio frequency filter (214), emitting a low noise amplifier (215) and a first switch (003), wherein the local oscillator is also connected to the mixer; 该接收电路包括顺序连接的第一切换开关、接收低噪声放大器、接收射频滤波器、接收可变增益放大器、第二切换开关、共用射频滤波器、混频器、第三切换开关、接收中频放大器、接收中频滤波器、 以及连接基带处理单元的解调器或数字解调器;所述第一切换开关、第二切换开关、第三切换开关分别由第一切换控制信号和第二切换控制信号控制,当收发信机处于接收状态时,通过时序控制使第一切换控制信号为高电平,第二切换控制信号为低电平,当收发信机处于发射状态时,通过时序控制使第一切换控制信号为低电平,第二切换控制信号为高电平。 The receiving circuit comprises a first switch connected in sequence, receive a low-noise amplifier, receiving a radio frequency filter receiving a variable gain amplifier, the second switch, the common radio frequency filter, a mixer, a third switch, the reception intermediate frequency amplifier receive IF filter, and a demodulator connected to the baseband processing unit or digital demodulator; the first switch, second switch, third switch and the second switching signals, respectively controlled by a first switching control signal control, when the transceiver is in a receiving state, the first switching control signal by controlling the timing of high level, the second switching control signal is low when the transceiver is in transmit state, by controlling the timing of the first The switching control signal is low level, the second switching control signal is high. 较佳的,所述时分双工无线通信系统的空中无线信号包括上行时隙、保护时隙和下行时隙,所述第二切换开关在发射使能时将共用射频滤波器和混频器接入发射电路;在接收使能时将共用射频滤波器和混频器接入接收电路,该发射使能与接收使能之间的切换时间在该保护时隙内。 Preferably, the time division duplex radio communication system comprises an uplink slot-air radio signal, the protection time slot and downlink slot, said second switch so that the emitter of the common radio frequency filters and mixers is enabled then the transmitting circuit; in that the receiving of the common radio frequency filters and mixers is enabled access to the receiving circuit, the transmitter and receiver to enable the switching between the time slot can be within the guard. 较佳的,该混频器直接连接本振或者该混频器通过緩沖放大器与本振连接。 Preferably, the mixer or directly connected to the local oscillator mixer with a local oscillator through a buffer amplifier connected. 较佳的,该发射电路和接收电路共同电连接一双向可调衰减器,该可调衰减器连接该混频器和该第三切换开关。 Preferably, the transmitting and receiving circuits electrically connected to a common two-way adjustable attenuator, of the adjustable attenuator and the mixer is connected to the third switch. 较佳的,所述可调衰减器可以连接在中频链路也可以连接在射频链路上。 Preferably, the variable attenuator can be connected to the intermediate link may also be connected over the radio link. 较佳的,该发射电路和接收电路通过切换开关共同电连接一中频滤波器,该中频滤波器连接在该混频器与第三切换开关之间。 Preferably, the transmitting and receiving circuits electrically connected together through an intermediate frequency filter switch, the IF filter is connected between the mixer and the third switch. 较佳的,该中频滤波器连接在可调衰减器与第三切换开关之间,或者连接在混频器与可调衰减器之间。 Preferably, the IF filter is connected between the variable attenuator and the third switch, or between the mixer and the adjustable attenuator. 附图说明图l是现有无线收发信机电路图;图2是釆用数字中频技术的现有收发信机电路图;图3是本发明无线收发信机第一实施例电路示意图;图4是图3中无线收发信机的时序控制示意图;图5是本发明无线收发信机第二实施例电路示意图。 BRIEF DESCRIPTION OF DRAWINGS Figure l is a circuit diagram of a conventional radio transceiver; FIG. 2 is preclude the use of prior art digital IF circuit diagram of the transceiver; FIG. 3 is a schematic diagram of a circuit embodiment of the present invention is a wireless transceiver a first embodiment; FIG. 4 is a diagram the timing of a wireless transceiver 3 is a schematic view of a control; FIG. 5 is a circuit diagram of a second embodiment of the present invention is a wireless transceiver. 具体实施方式为了便于本领域一般技术人员实施与理解本发明,下面分别参照附图通过实施例描述本发明。 DETAILED DESCRIPTION For purposes of this embodiment and those of ordinary skill in the art understand the present invention, the following description of the accompanying drawings the present invention by way of example with reference respectively. 通过前面的介绍,可以看出,收信机和发信机的很多器件在收发链路中所起到的作用是相同的,特别是在TDD无线通信系统中。 By the foregoing description, it can be seen, many devices of the transmitter and receiver in a transceiver link role played is the same, especially in a TDD wireless communication system. 由于TDD系统中发射和接收时,收发信机工作频率相同,发射电路中射频滤波器和中频滤波器与接收电路中的射频滤波器和中频滤波器是完全相同的。 TDD system due to transmission and reception, the same as the operating frequency of the transceiver, transmitter circuit RF filter and IF filter and the reception circuit RF filter and IF filter are identical. 对于混频器,如果采用无源混频器,其可以作为上变频器和下变频器使用。 For the mixer, if the passive mixer, which can be used as an upconverter and a downconverter used. 由于TDD是时分工作,在同一时刻只有一个方向的链路处于工作状态,这就为发射电路和接收电路上的器件共用提供了可能。 Since TDD time division of work, at the same time in one direction only link is in working condition, which is on the emitting device and receiving circuits share possible. 对于相同的无源器件可以时分复用到接收电路和发射电路,也就是在接收时,该无源器件连接到接收电路上,在发射时,该无源器件连接到发射电路上。 For the same passive devices and can be time-division multiplex transmitting circuit to the reception circuit, i.e. when receiving the passive components connected to the receiver circuit, when transmitting, the passive components connected to the transmitting circuit. 因此本发明提出一种用于TDD的无线收发信机电路,在发射和接收电路中共用射频滤波器和变频器,以及可调衰减器。 Therefore, the present invention proposes a wireless transceiver circuit for TDD in transmitting and receiving radio frequency filter circuit and shared by the inverter, and an adjustable attenuator. 具体结合图3,本发明第一实施例中的收发信机包括一天线001、基带处理单元100以及连接天线与基带处理单元的发射电路和接收电路。 DETAILED conjunction with Figure 3, a first embodiment of the present invention comprises a transceiver antenna 001, a baseband processing unit 100 and a transmission circuit and a receiving circuit connected to the antenna and the baseband processing unit. 接收电路包括顺序连接的第一射频滤波器002、第一切换开关003、接收低噪声放大器(LNA) 110、接收射频滤波器111、接收可变增益放大器112、第二切换开关004、共用射频滤波器OIO、混频器Oll、可调衰减器012、第三切换开关005、接收中频放大器113、接收中频滤波器114、以及连接基带处理单元100 的解调器115。 The receiving circuit includes a first RF filter 002 connected in sequence, a first switch 003, receiving low noise amplifier (LNA) 110, receives a radio frequency filter 111, receiving a variable gain amplifier 112, a second switch 004, a common RF filtering is the OIO, Oll mixer, adjustable attenuator 012, third switch 005, the reception intermediate frequency amplifier 113, the reception intermediate frequency filter 114, and the demodulator 115 connected to the baseband processing unit 100. 其中,开关003、 004、 005分别由切换控制信号SW1和SW2控制,混频器011还连接本振008。 Wherein, the switch 003, 004, 005, respectively, by the switching control signals SW1 and SW2, a mixer local oscillator 011 is also connected to the control 008. 可以理解,该本振008也可以通过緩冲放大器(未图示)与混频器011连接。 It will be appreciated, the oscillator 008 may also be present (not shown) through a buffer amplifier connected to the mixer 011. 开关003、 004、 005根据基站或终端的时序控制进行切换。 Switches 003, 004, 005 is switched in accordance with the timing control base station or a terminal. 图4是基站的控制时序图。 FIG 4 is a timing chart of the control of the base station. 在此只对基站的控制时序作说明,终端的控制时序和基站的控制时序类似,只是时间点不一样:当基站处于发射使能时,终端处于接收使能;当基站处于接收使能时,终端处于发射使能。 The control of the timing of the base station only for explanation, similar control timing control timing and a base station terminal, but the time point is not the same: when the base station is transmitting is enabled, the terminal is in the reception enabled; when the base station is in the reception enabled, transmitting terminal is enabled. 无论基站,还是终端,所有的转换控制都是在系统的保护时隙GT0和GT1内实现的。 Whether the base station, or a terminal, the switching control are all implemented within the protection time slot GT0 and GT1 system. 在图4中示意性表示了时分双工通信系统中基站的控制时序。 In FIG. 4 schematically shows a control sequence in a time division duplex communication system base station. 时分双工通信系统的空中无线信号包括多数个帧,其中,每一帧有两个保护时隙GT0和GTl,有N个下行时隙(slot 0至slot N-1 ) 和M个上行时隙(slot N至slot N+Ml ),该〗呆护时隙介于上行时隙和下行时隙之间。 Air radio signal time division duplex communication system comprising a plurality of frames, wherein each frame has two slots GT0 and GTL protection, there are N downlink slots (slot 0 to slot N-1) and M uplink slots (slot N to slot N + Ml), the slot guard〗 stay between uplink time slots and downlink time slots. 在下行时隙,发射使能,SW1低电平,SW2 高电平,开关003、 004、 005中C点连接S2点,基站发射电路接通。 In the downlink time slot, transmit enable, low SWl, SW2 level, the switch 003, 004, 005 connected to point C point S2, the base station transmitting circuit is turned on. 在保护时隙GT0,基站由发射使能状态转为接收使能状态, 控制信号SW1为高电平,SW2为低电平,三组开关003、 004、 005的C点都连接SI点,使接收电路接通。 In the guard slot GT0, enabling the base station by the transmitting state to the reception enabled state, the control signal SW1 is high, SW2 is low, three sets of switches 003, 004, C SI points 005 are connected, enabling the a receiving circuit is turned on. 在保护时隙GTl,基站由接收使能状态又转为发射使能状态,SW1低电平,SW2高电平,开关003、 004、 005中C点连接S2点,导通发射电if各。 GTL the guard slot, the base station by the reception enabled state and transmitting into the enable state, low SWl, SW2 level, the switch 003, 004, 005 connected to point C point S2, is turned on if the respective emission. 回到图3,当收发信机处于接收状态时,通过时序控制使控制信号SW1上电平为高,SW2为低,开关003, 004, 005的C点和SI点连通。 Returning to Figure 3, when the transceiver is in a receiving state, the timing control so that the level is high on the control signal SW1, SW2 is low, switches 003, 004, C SI point and the point 005 in communication. 其信号流向如下:无线信号从天线001输入,经第一射频滤波器002滤波,经过开关003,此时003的C点和SI点是连通的,信号输入到接收低噪声放大器110,信号放大后,再经接收射频滤波器lll滤波,经过接收可变增益放大器112放大后,信号输入到开关004的C点,此时开关003的C点和SI点是连通的,所以信号输入到共用射频滤波器010,经过混频器011,此时由于信号是从混频器的射频入口输入,和本振(RF—LO) 008的本振信号混频后,输出中频信号,此时的混频器Oll起一个下变频器的作用。 Which signal flow is as follows: a wireless signal input from the antenna 001, RF filter 002 via the first filter, through the switch 003, and SI at this time point C point 003 is in communication, the reception signal is inputted to the low noise amplifier 110, the signal amplified , and then by filtering the received radio frequency filter lll, after receiving the variable gain amplifier 112 amplifies the signal input to the switch 004 at point C, point C, and at this time the switch points SI 003 is connected, the signal input to the common RF filtering after 010, 011 through the mixer, at this time since the signal is a local oscillator signal 008 from the RF mixer input of the mixer inlet, and a local oscillator (RF-LO), the output IF signal from the mixer at this time Oll play the role of a down-converter. 混频器Oll输出的中频信号经012可调衰减器进一步调整信号电平,送入开关005,此时的005的C点和Sl点是连通的, 中频信号送入到接收中频放大器113。 Oll intermediate frequency signal output by the mixer 012 to adjust the variable attenuator further signal level fed to the switch 005, 005 at this time point C and the point Sl is connected, to the reception intermediate frequency signal into an intermediate frequency amplifier 113. 经接收中频滤波器114滤波后到解调器115。 After receiving the filtered IF filter 114 to the demodulator 115. 将中频信号解调为I、 Q基带信号,送入基带处理单元100,进行后续的基带处理。 The IF signals are demodulated into I, Q baseband signals into baseband processing unit 100, subsequent baseband processing. 本发明收发信机的发射电路包括顺序连接的与基带处理单元100连接的解调器210、发射中频滤波器211、发射中频放大器212、第三切换开关005、可调衰减器012、混频器Oll、共用射频滤波器010、第二切换开关004、发射可变增益放大器213、发射射频滤波器214、发射低噪声放大器215、第一切换开关003以及第一射频滤波器002与天线001电连接。 Transmitting transceiver circuit of the present invention comprises a serially connected to the baseband processing unit 100 connected to the demodulator 210, a transmit IF filter 211, a transmit IF amplifier 212, a third switch 005, variable attenuator 012, a mixer OLL, the common radio frequency filter 010, a second switch 004, a transmit variable gain amplifier 213, a transmit RF filter 214, low noise amplifier 215 emission, a first switch 003 and a first RF filter 002 is electrically connected to the antenna 001 . 其中,混频器011还连接本振008。 Wherein, the mixer 011 is also connected to the local oscillator 008. 当收发信机处于发射状态时,此时控制信号SW1为低电平, SW2为高电平,开关003, 004, 005的C点和S2点连通。 When the transceiver is in transmit state, when a low level control signal SW1, SW2 is high, switches 003, 004, C 005 and the point S2 point communication. 基带处理单元100输出的I,Q基带信号通过调制器210,将基带信号调制为中频信号,经发射中频滤波器2il滤波以及发射中频放大器212 放大后输入到开关005的S2点,此时开关005的C点和S2点是连通的,中频信号送入可调衰减器012,进行第一次功率控制,经过混频器Oll,此时由于信号是从混频器011的中频入口输入,和本振LO 008输出的本振信号混频后,输出射频信号,此时的混频器Oll起一个上变频器的作用。 The baseband processing unit 100 outputs I, Q baseband signal by the modulator 210, a baseband signal modulated intermediate frequency signal S2 inputted to the switch 005 after the point 212 amplified by the transmit IF filter and a transmitter filter 2il IF amplifier, at this time the switch 005 the point C and the point S2 is connected, the intermediate frequency signal into the variable attenuator 012, a power control for the first time, through the mixer Oll, this time due to the IF signal from the mixer 011 inputs the inlet, and this after the local oscillator signal output from the mixer oscillator LO 008, the RF output signal, this time from a mixer Oll acting on the drive. 混频器Oll输出的射频信号经射频滤波器010,送入开关004,此时开关004的C点和S2点是连通的,射频信号进入发射射频可变增益放大器213,经发射射频滤波器214进一步滤波后,由发射低噪声放大器215功放输出到开关003,此时的开关003的C点和S2点是连通的,射频信号通过滤波器002到天线001发射出去。 Oll radio frequency signal output from the mixer 010 via radio frequency filter, into the switch 004, when switch S2 and the C point 004 is the point communication, transmitting a radio frequency RF signal enters the variable gain amplifier 213, the transmit RF filter 214 after further filtering, by the transmit amplifier output low noise amplifier 215 to the switch 003, then the switch 003 and the point C is the point S2 communication, radio frequency signals emitted by the filter 002 to the antenna 001. 该发收信机中的发射电路和接收电路通过开关电路共用射频滤波器,混频器,可调衰减器,为了实现共用,这些器件都应当是双向的。 Transmitting and receiving circuits of the receiver sent by the switch circuits share RF filters, mixers, variable attenuator, in order to achieve a common, these devices should be bidirectional. 另外,双向混频器在不同工作状态下,起不同的作用:在接收状态时,做为下变频器,实现射频信号到中频信号的向下频谱搬移;在发射状态时,做为上变频器,实现中频信号到射频信号的向上频镨搬移。 Further, the bidirectional mixer under different working conditions, play different roles: upon receiving state, as downconverter, implement a radio frequency signal to an intermediate frequency signal spectrum shifting down; when transmitting state, as the drive , the intermediate frequency signal to achieve an upward RF signal frequency praseodymium move. 本发明的收发信机共用了比较昂贵的射频滤波器、混频器以及可调衰减器。 Transceiver according to the invention is a relatively expensive share RF filters, mixers, and adjustable attenuator. 同时,对于本振而言,不用功率分配器就可以直接连接混频器。 Meanwhile, the local oscillator, the power divider can not be directly connected to the mixer. 采用这种设计可以降低成本,节约功耗,有利于提高电路设计的集成度。 With this design can reduce costs, conserve power, it will help improve the integrated circuit design. 需要指出的是,共用的可调衰减器可以设置在中频链路,也可以设置在射频链路上。 It should be noted that a common adjustable attenuator may be provided in the intermediate link may be provided on the radio link. 发射电路和接收电路中的中频滤波器可以根据需要实现共用。 Transmitting circuit and the receiving circuit common to the IF filter may be implemented according to need. 共用中频滤波器时,该中频滤波器连接在双向混频器011与切换开关005之间,或者连接在可调衰减器012与开关005之间,或者连接在双向混频器011与可调衰减器012之间。 When the common intermediate frequency filter, IF filter which is connected between the mixer 011 and the bidirectional switch 005, or connected between the variable attenuator 012 and the switch 005, or connected to a bidirectional attenuation in the mixer 011 and tunable between 012. 图5中所示的是本发明第二实施例,是在l次变频技术中应用了数字中频技术的收发信机电路示意图。 FIG 5 is a second embodiment of the present invention, is a schematic view of the application of the transceiver circuitry in the digital IF technology l-conversion techniques. 该收发信机的工作原理和第一实施例中采用2次变频技术的无线收发信机类似,但是,对于接收电路将解调器115变为数字解调器115,;对于发射电路,将调制器210变为数字调制器210,。 Working principle of the transceiver and a wireless transceiver used in Example 2-conversion technique similar to the first embodiment, however, for the reception circuit 115 to the demodulator 115 into digital demodulator circuit ,; for transmitting the modulated 210 into a digital modulator 210 ,. 数字解调器115,由高速ADC (模数转化器)和数字下变频器组成。 Digital demodulator 115, by the high speed ADC (analog digital converter) converters and digital components. 数字解调器115,对中频滤波器114输出的中频信号进行数字解调,直接输出数字信号给基带处理单元100。 Digital demodulator 115, the intermediate frequency signal IF output from the digital filter 114 demodulates the output digital signal directly to the baseband processing unit 100. 对于发射通道,数字调制器210,由数字上变频器和高速DAC (数模转化器)组成。 For the transmit path, a digital modulator 210, a digital converter and a high-speed DAC (digital analog converter) composition. 数字调制器210,直接接收基带处理单元IOO的数字信号I、 Q信号,进行数字调制后输出模拟中频信号给中频滤波器211。 Outputs an analog IF signal to the IF filter 211 the digital modulator 210, a baseband processing unit IOO directly receives digital signals I, Q signals for digital modulation. 本发明通过切换开关将共用的射频滤波器、混频器、可调衰减器连接到发射电路或接收电路上。 The present invention, by switching the switch the common RF filters, mixers, variable attenuator connected to the transmitting circuit or the receiving circuit. 切换开关受使能信号控制,在发射使能时将射频滤波器和混频器接入发射电路;在接收使能时将射频滤波器和混频器接入接收电路。 Switch controlled by an enable signal, so that the transmitting radio frequency filters and mixers access transmission circuit is enabled; in that the received radio frequency filters and mixers is enabled access reception circuit. 可以理解,可调衰减器也可以分别连接在发射电路和接收电路上,不共用。 Be appreciated that the variable attenuator may be connected to the transmitting and receiving circuits, respectively, it is not common. 为了补偿收发信机的不同增益要求,实际上收发链路上已经分别加了不同的可变增益放大器。 In order to compensate for the different gain requirements of the transceiver, the transceiver link has been actually added respectively different variable gain amplifier. 这个共用可调衰减器是为了进一步扩展控制范围。 The adjustable attenuator is common to further extend the control range. 本发明主要针对基站使用,基站对可调衰减器,混频器的要求都比较高。 The present invention is primarily directed to use the base station, the base station are high on the adjustable attenuator, mixer requirements. 采用共用混频器,需要对混频器提出特殊的要求,只能采用无源混频器,且能作为上变频器和下变频器使用。 Using a common mixer, need to make special demands on the mixer, only passive mixer, and can be used as an upconverter and downconverter used. 通常,对于上下变频器的技术指标要求不同,共用变频器设计时需要确认接收电路和发射电路的指标分配,才能保证正确的共用混频器。 Typically, the technical requirements for the different down converter, the common transmitting and receiving circuits need to confirm index distribution circuit, in order to ensure proper mixer common drive design. 虽然通过实施例描绘了本发明,本领域普通技术人员知道,本发明有许多变形和变化而不脱离本发明的精神,希望所附的权利要求包括这些变形和变化而不脱离本发明的精神。 Although the present invention is depicted by way of example, those of ordinary skill in the art know that there are many modifications and variations of the present invention without departing from the spirit of the invention, intended that the appended claims cover such modifications and variations without departing from the spirit of the invention.

Claims (6)

1. 一种时分双工无线通信系统收发信机,其包括天线(001)、基带处理单元(100)以及连接天线与基带处理单元的发射电路和接收电路,该发射电路和接收电路包括共用的第一切换开关(003),并且通过该第一切换开关连接天线,其特征在于,该发射电路和接收电路还包括共同电连接的双向混频器(011)和一组在第一切换开关与混频器之间的第二切换开关(004); 该发射电路和接收电路通过第二切换开关共同电连接共用射频滤波器(010),该共用射频滤波器连接在该第二切换开关与所述混频器之间; 该发射电路包括顺序连接的与基带处理单元连接的调制器或数字调制器、发射中频滤波器(211)、发射中频放大器(212)、第三切换开关、混频器、共用射频滤波器、第二切换开关、发射可变增益放大器(213)、发射射频滤波器(214)、发射低噪声放大器(215)以及第一切换开关(003) 1. A time division duplex wireless communication system transceiver, which includes an antenna (001), a baseband processing unit (100), and transmitting and receiving circuits connected to the antenna and the baseband processing unit, the transmitting circuit and a receiving circuit comprising a common a first switch (003), and by the first switch connected to the antenna, wherein the transmitting and receiving circuits further includes a bidirectional mixer (011) and electrically connected in common to a first switch group and a second switch between the mixer (004); the transmitting and receiving circuits electrically connected in common shared radio frequency filter (010) via a second switch, the common connecting the radio frequency filter and the second switch between said mixer; the transmitting circuit includes a modulator or a digital modulator connected to sequentially connected baseband processing unit, and transmit IF filter (211), a transmit intermediate frequency amplifier (212), a third switch, mixer common radio frequency filter, the second switch, the variable gain transmit amplifier (213), transmits a radio frequency filter (214), emitting a low noise amplifier (215) and a first switch (003) 其中,混频器还连接本振;该接收电路包括顺序连接的第一切换开关、接收低噪声放大器、接收射频滤波器、接收可变增益放大器、第二切换开关、共用射频滤波器、混频器、第三切换开关、接收中频放大器、接收中频滤波器、以及连接基带处理单元的解调器或数字解调器; 所述第一切换开关、第二切换开关、第三切换开关分别由第一切换控制信号和第二切换控制信号控制,当收发信机处于接收状态时,通过时序控制使第一切换控制信号为高电平,第二切换控制信号为低电平,当收发信机处于发射状态时,通过时序控制使第一切换控制信号为低电平,第二切换控制信号为高电平。 Wherein the local oscillator is also connected to the mixer; the receiving circuit comprises a first switch connected in sequence, receive a low-noise amplifier, receiving a radio frequency filter receiving a variable gain amplifier, the second switch, the common radio frequency filter, a mixer , a third switch, the receiving intermediate frequency amplifier, receiving IF filter, and a demodulator connected to the baseband processing unit or digital demodulator; the first switch, second switch, third switch, respectively, from the first a switching control signal and the second switching control signal when the transceiver is in a receiving state, the timing control of the first switching control signal is high, the second switching control signal is low when the transceiver is when transmitting state, by controlling the timing of the first switching control signal to a low level, the second switching control signal is high.
2. 如权利要求l所述的收发信机,其特征在子,所述时分双工无线通信系统的空中无线信号包括上行时隙、保护时隙和下行时隙,所述第二切换开关在发射使能时将共用射频滤波器和混频器接入发射电路;在接收使能时将共用射频滤波器和混频器接入接收电路,该发射使能与接收使能之间的切换时间在该保护时隙内。 2. A transceiver as claimed in claim l, wherein the promoter, the wireless air time division duplex wireless communication system signal includes an uplink time slot and downlink slot guard time, in the second switch so that the common transmit RF filter and mixer circuit is enabled access transmission; the common radio frequency filters and mixers upon receiving an enable access reception circuit, to enable the transmitting and the receiving time between the switching can in the guard slots.
3. 如权利要求l所述的收发信机,其特征在于,所述混频器直接连接本振(008 )或者该混频器通过緩冲放大器与本振连接。 L transceiver according to claim 2, wherein said mixer is connected directly to the local oscillator (008) or the mixer with a local oscillator through a buffer amplifier connected.
4. 如权利要求2或3所述的收发信机,其特征在于,所述发射电路和接收电路共同电连接一双向可调衰减器(012),该可调衰减器连接所述混频器和所述第三切换开关。 4. The transceiver of claim 2 or claim 3, wherein said common transmit and receive circuits electrically connected to a bidirectional variable attenuator (012), the adjustable attenuator connected to said mixer and said third switch.
5. 如权利要求4所述的收发信机,其特征在于,所述可调衰减器可以连接在中频链路也可以连接在射频链路上。 5. A transceiver as claimed in claim 4, wherein said adjustable attenuator may be connected intermediate link may also be connected over the radio link.
6. 如权利要求5所述的收发信机,其特征在于,所述发射电路和接收电路共同电连接一中频滤波器,该中频滤波器连接在所述可调衰减器与所述第三切换开关之间,或者连接在所述混频器与所述可调衰减器之间。 6. A transceiver as claimed in claim 5, wherein said transmitting circuit and the receiving circuit common electrically connecting an intermediate frequency filter, IF filter which is connected between the variable attenuator and the third switch between the switch, or the connection between the mixer and the adjustable attenuator.
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CN1476183A (en) 2003-07-18 2004-02-18 大唐移动通信设备有限公司 Method and device for proceeding bidirectional synchronous translate against radio signal

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