WO2010118689A1 - 一种射频模块的支持多频段共存的方法及装置 - Google Patents

一种射频模块的支持多频段共存的方法及装置 Download PDF

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Publication number
WO2010118689A1
WO2010118689A1 PCT/CN2010/071780 CN2010071780W WO2010118689A1 WO 2010118689 A1 WO2010118689 A1 WO 2010118689A1 CN 2010071780 W CN2010071780 W CN 2010071780W WO 2010118689 A1 WO2010118689 A1 WO 2010118689A1
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frequency
signals
different
intermediate frequency
bands
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PCT/CN2010/071780
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English (en)
French (fr)
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吕锐
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华为技术有限公司
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Priority to EP18196005.5A priority Critical patent/EP3512111B1/en
Priority to EP10764102.9A priority patent/EP2421174B1/en
Publication of WO2010118689A1 publication Critical patent/WO2010118689A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
    • H04B1/0075—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using different intermediate frequencied for the different bands
    • H04B1/0078—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using different intermediate frequencied for the different bands with a common intermediate frequency amplifier for the different intermediate frequencies, e.g. when using switched intermediate frequency filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
    • H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band

Definitions

  • the present invention relates to wireless communication technologies, and in particular, to a method and apparatus for supporting multi-band coexistence of a radio frequency module.
  • the RF front-end mainly realizes the function of receiving and transmitting wireless signals, and plays an important role in wireless communication systems.
  • the RF front end is generally composed of a transmitter and a receiver, and is collectively referred to as a transceiver (TRX).
  • TRX transceiver
  • RF modules RF front-end modules
  • RF modules RF front-end modules
  • FDD Frequency Division Duplex
  • 3GPP TS 3rd Generation Partnership Project Technical Specification
  • RRU Radio Remote Unit
  • RFU Radio Frequency Unit
  • a method and a device for supporting multi-band coexistence of a radio frequency module are provided, so that the simultaneous processing of signals of two or more frequency bands is realized by simply using one radio frequency module.
  • an embodiment of the present invention provides a method for supporting multi-band coexistence of a radio frequency module, where the method includes:
  • the RF signals of different frequency bands are mixed under the local oscillator to different intermediate frequency ranges to obtain intermediate frequency signals of different frequency ranges corresponding to different frequency bands;
  • the combined intermediate frequency signal is sent to a multi-channel analog-to-digital converter for intermediate frequency analog to digital conversion processing.
  • the embodiment of the invention further provides a radio frequency module, the module comprising: At least one multiplexer, each for receiving radio frequency signals of at least two frequency bands; at least two mixing units for separately mixing radio frequency signals of different frequency bands to different intermediate frequency frequency ranges by local oscillator, and obtaining corresponding frequency bands Intermediate frequency signals of different frequency ranges;
  • At least one combiner each for frequency domain combining of the downmixed intermediate frequency signals of different frequency ranges received by each multiplexer;
  • An analog to digital converter for performing intermediate frequency analog to digital conversion processing on the combined intermediate frequency signal.
  • the method and apparatus of the embodiments of the present invention can implement simultaneous processing of signals of two or more frequency bands by using one radio frequency module simply and at low cost.
  • FIG. 1 is a schematic structural diagram of a radio frequency module supporting two frequency bands
  • FIG. 2 is a schematic diagram of frequency band characteristics of the radio frequency module corresponding to FIG. 1;
  • FIG. 3 is a schematic structural diagram of a radio frequency module according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of a radio frequency module according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic diagram of receiving in a radio frequency module according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of implementing frequency mixing in a radio frequency module according to Embodiment 2 of the present invention.
  • FIG. 7 is a schematic diagram of filtering and merging in a radio frequency module according to Embodiment 2 of the present invention
  • FIG. 8 is a schematic diagram of a principle for implementing co-channel blocking interference in a radio frequency module according to Embodiment 2 of the present invention
  • FIG. 10 is a schematic structural diagram of a radio frequency module according to Embodiment 3 of the present invention
  • FIG. 11 is a schematic diagram showing the principle of implementing the same-frequency blocking interference in the radio frequency module according to Embodiment 3 of the present invention
  • FIG. 12 is a schematic structural diagram of the radio frequency module according to Embodiment 4 of the present invention.
  • FIG. 13 is a flowchart of a method for supporting multi-band coexistence of a radio frequency module according to Embodiment 5 of the present invention.
  • FIG. 14 is a flow chart of a method for supporting multi-band coexistence of another radio frequency module according to Embodiment 5 of the present invention. detailed description
  • the transmission bands of the three frequency bands of the frequency band 12-band 14 are very close, the bandwidth is 40 MHz, and the receiving frequency band is separated far apart, spanning 100 MHz. In this scenario, it is relatively easy to implement two or more frequency bands to work simultaneously with one radio frequency module.
  • the processing of two or more (including two) frequency bands in the frequency band 12 to the frequency band 14 is taken as an example. To explain.
  • the RF module 110 is a 2T2R (double-issue and dual-receiver) RF module using a triplexer.
  • the frequency band characteristics of the RF module are shown in Figure 2.
  • the transmitter section of the triplexer directly covers the entire FTX frequency range with a transmit cavity bandpass filter (not shown), while suppressing the receive bands FRX1 and FRX2.
  • the receiving part of the triplexer uses two receive bandpass cavity filters (not shown) with frequency ranges of FRX1 (band 12 receiving frequency range) and FRX2 (band 13 receiving frequency range), the two receiving The bandpass cavity filter also achieves suppression of the transmit band FTX.
  • a triplexer has a firing chamber, two receiving chambers, and four interfaces: an ANT (antenna) interface, an interface to the firing chamber, and an interface between the two and the receiving chamber.
  • ANT antigenna
  • there are two triplexers correspondingly: two transmitting cavities, four receiving cavities, two antenna interfaces ANTA, ANTB, two interfaces with the transmitting cavity, four with The interface between the receiving chambers.
  • the downlink transmit signal TX of the entire FTX frequency range is amplified and transmitted through the antenna interface ⁇ and the antenna interface , respectively, and transmit diversity can be formed between the two signals.
  • signals of different modes or multiple carriers can be split into two parts and transmitted from ⁇ and ⁇ respectively.
  • the transceiver uses the receiving cavity of the triplexer to receive two signals RX1 from the band 12 of ⁇ and , to form a main diversity reception, and the filtered two-way main diversity signal RX1 transmits the radio frequency signal through the same local oscillator signal. Downmixing to the IF signal of the same frequency range, passing through the IF filter and sending it to a dual ADC for analog to digital conversion processing.
  • the two signals RX2 from the ANTA and ANTB are received and processed in the same way as the signal RX1.
  • the IF signal is filtered and sent to another dual ADC for analog to digital conversion.
  • the RF transceiver module simultaneously processes the signals of the two frequency bands through the transceiver structure shown in FIG.
  • the structure of the radio frequency module is modified, and the complexity and cost of the radio module TRX structure are reduced by cleverly designing the change of the receiver form, and the reliability of the radio frequency module is improved, and the reliability is lowered. Power consumption.
  • This embodiment provides a radio frequency module (transceiver) capable of simultaneously processing two or more bands.
  • the structure of the radio frequency module 310 is as shown in FIG. 3, and includes: At least one multiplexer, each for receiving radio frequency signals of at least two frequency bands.
  • the multiplexer can be, for example, a triplexer.
  • the multiplexer can be, for example, a four-worker, receiving the radio frequency signals of four frequency bands.
  • the multiplexer may be, for example, a five-worker, but the present invention is not limited thereto.
  • the radio frequency signals received by the two or more multiplexers form a primary diversity reception, that is, the radio frequency signals received by the two or more multiplexers are respectively a primary set. And diversity RF signals.
  • At least two mixing units are respectively used for mixing the RF signals of different frequency bands to different intermediate frequency ranges by the local oscillator, and obtaining intermediate frequency signals of different frequency ranges corresponding to different frequency bands.
  • the aforementioned mixing unit may include a mixer and a local oscillator.
  • the RF module may include two mixing units, such as Mixerl and Mixer2 in FIG. 3, for respectively performing the downmixing of the RF signals of each frequency band through the local oscillator. Obtain two intermediate frequency signals of different frequency ranges corresponding to two frequency bands, and the frequency ranges of the two intermediate frequency signals are IF1 and IF2, respectively.
  • At least one combiner is used for frequency domain combining of the mixed intermediate frequency signals of different frequency ranges received by each multiplexer.
  • the two intermediate frequency signals of the frequency range IF1 and IF2 are combined in the frequency domain, that is, the spectrum synthesis is combined into a wide-spectrum intermediate frequency signal, and the frequency range of the combined intermediate frequency signal in the frequency domain is IF1 + IF2.
  • a multi-channel analog-to-digital converter for analog-to-digital conversion of frequency-domain combined IF analog signals.
  • the ADC is, for example, a multi-channel ADC comprising two or more channels for analog-to-digital conversion of the combined intermediate frequency analog signals in the frequency domain.
  • the processing and principle are It is the same, so it is not described too much here.
  • a multi-band received signal can be processed simultaneously by using a dual-channel or multi-channel ADC, which greatly simplifies the complexity of the receiver, reduces the hardware scale and cost, and improves the reliability and power consumption. It is reduced accordingly.
  • Example 2
  • This embodiment provides a 2T2R (2 transmit 2 receive) radio frequency module (transceiver) supporting two frequency bands.
  • the RF module combines current three-worker technology to achieve simultaneous processing of two frequency bands.
  • the radio frequency module using the triplexer of this embodiment is as shown in FIG.
  • the RF module 410 shown in FIG. 4 includes: two triplexers, two mixer circuits, two combiners, and a two-channel ADC.
  • Each of the three workers is configured to receive radio frequency signals RX1 and RX2 in different frequency bands.
  • the RF signals received by the two triplexers form the primary diversity reception, that is, the RF signals received by the two triplexers are the primary and diversity signals, respectively.
  • the mixers Mixerl and Mixer2 respectively form the two mixing circuits with the local oscillators L01 and L02.
  • the two mixing circuits respectively mix the RF signals of different frequency bands, such as RX1 and RX2, into different intermediate frequency ranges to obtain two intermediate frequency signals of different frequency ranges, and the frequency ranges of the two intermediate frequency signals are respectively IF1 and IF2.
  • Each combiner is used for frequency domain combining of the two intermediate frequency signals of different frequency ranges, that is, frequency spectrum synthesis, and combined into a wide spectrum intermediate frequency signal, and the frequency range of the combined intermediate frequency signals in the frequency domain is IF1 + IF2.
  • the combiner feeds the entire intermediate frequency signal in the frequency domain to a dual ADC for processing.
  • the dual ADC is configured to perform analog to digital conversion processing on the combined intermediate frequency analog signal to convert the analog signal into a digital signal.
  • This structure greatly reduces the complexity, saves hardware size and cost, and thus improves reliability and power consumption.
  • each triplexer has one transmitting cavity, two receiving cavities, and four interfaces: one antenna interface (ANTA or ANTB), one with transmitter TX The interface between the two, the interface with the receiver RX.
  • the two triplexers in Figure 4 receive two signals from ANTA and ANTB, respectively, forming a primary diversity reception.
  • the processing of the transmitted signal by the triplexer is the same as the processing of the transmitted signal by the triplexer in the radio frequency module 110.
  • the triplexer receives the radio frequency signals from the two frequency bands of the antenna interfaces ANTA and ANTB, and forms a frequency domain independent after receiving the cavity filter (not shown) by the main diversity of the triplexer.
  • the RF signals RX1 and RX2 are amplified by the RF of the amplifier, the RF signals RX1 and RX2 are respectively down-mixed to the IF signals of different frequency ranges with a certain bandwidth by using different mixing circuits.
  • Each mixing circuit can include a mixer and a local oscillator, and different mixing circuits can correspond to different local oscillators.
  • the RF signals RX1 and RX2 can be separately mixed to different frequency ranges by a mixer and two different RF local oscillators, and the frequency ranges of the mixed intermediate frequency signals are IF1 and IF2, respectively.
  • the intermediate frequency filters BPF1 and BPF2 are used to respectively perform intermediate frequency filtering on the mixed two intermediate frequency signals.
  • the blocking signal of one frequency band may become the same frequency interference of the blocking signal of the other frequency band.
  • the filters of the intermediate frequency channel BPF1 and BPF2 can be used to suppress the same frequency interference, and the filters BPF1 and BPF2 are for the same frequency interference.
  • the degree of suppression can be considered in accordance with the requirements of the intermediate frequency image rejection.
  • the blocking signal in the frequency band where the signal RX1 is located, and the signals RX1 and RX2 are respectively mixed to obtain an intermediate frequency signal with frequency ranges of IF1 and IF2 respectively.
  • the blocking signal existing at this time will have a signal with a frequency range of IF2.
  • the blocking signal is basically filtered out, thereby effectively suppressing the co-channel interference of the blocking signal to the signal of the frequency range IF2.
  • the combiner is used for frequency domain combining of the two intermediate frequency signals, that is, combining the spectrums of the two intermediate frequency signals, thereby obtaining an intermediate frequency signal with a frequency range of IF1 + IF2.
  • the combined intermediate frequency signal can be filtered and amplified by an amplification filter circuit.
  • the main diversity signal of the combined intermediate frequency signal is simultaneously sent to a two-channel ADC for processing.
  • the dual-channel ADC can be, for example, an AD6655 analog-to-digital conversion chip from ADI. As the processing bandwidth of the ADC continues to increase, signals from more bands can be processed simultaneously.
  • the four receiving channels in the embodiment of the present invention are not independent receiving channels, which reduces the complexity of the receiver structure.
  • the radio frequency module of the embodiment described above mixes the radio frequency signals of different frequency bands to different intermediate frequency ranges by subtly changing the structure of the receiver in the transceiver, and combines and receives the intermediate frequency signals, and the combined
  • the IF signal is sent to a dual-channel ADC for processing, and finally a 2T2R RF module supports multiple frequency bands simultaneously. Since a two-channel ADC is used to support the simultaneous processing of the received signals in the two bands of the main diversity, the embodiment of the present invention greatly reduces the hardware complexity of the radio frequency module, saves cost, and reduces power consumption. By applying the present invention, there is a greater cost advantage for a multi-receiving system. This advantage will be even more pronounced as the number of ADC parallel processing channels increases and processing bandwidth increases.
  • This embodiment further provides a 2T2R radio frequency module (transceiver) supporting two frequency bands.
  • the intermediate frequency filters BPF1 and BPF2 are set to solve the same-frequency blocking interference problem, but the complexity of the channel is increased after the intermediate frequency filters BPF1 and BPF2 are set. Therefore, in this embodiment, the intermediate frequency filters BPF1 and BPF2 are not required to be provided, and the frequency of the local oscillators L01 and L02 is appropriately configured to suppress the same-frequency blocking interference.
  • the structural block diagram of the radio frequency module in this embodiment is shown in FIG.
  • the difference between the radio frequency module 510 and the radio frequency module 410 of the embodiment 2 is that: the intermediate frequency filters BPF1 and BPF2 are not provided, and a local oscillator adjusting unit is set for each local frequency band corresponding to the local oscillator, respectively 011 and 021.
  • the local oscillator adjusting units 011 and 021 are configured to analyze the air interface blocking feedback information, and adjust the frequency of the local oscillator corresponding to each frequency band according to the position of the air interface blocking signal of the air interface blocking feedback information, so as to adjust the radio frequency signal for each frequency band.
  • the local oscillator adjustment unit may be a software function module and implemented by software configuration.
  • Fig. 11 is a schematic view showing a process of configuring a local oscillator by using a local oscillator adjusting unit to suppress a blocking signal. It can be seen that by properly configuring the frequency of the local oscillators L01 and L02, increasing or decreasing, the blocking interference is placed outside the BPF3 passband, thereby suppressing the same-frequency blocking interference.
  • Figure 11 shows the relative position of the IF signals IF1 and IF2 as compared with Figure 10.
  • the structure and the method used in this embodiment are more flexible, and the suppression of the same-frequency blocking signal can be adaptively implemented according to the actual situation of the air interface blocking.
  • Embodiments 2 and 3 above provide a radio frequency module capable of simultaneously receiving signals of two frequency bands, but the present invention is not limited thereto, and the present invention can also solve the problem of simultaneously processing three or more frequency bands.
  • FIG. 12 is a schematic diagram of a 610 architecture of a radio frequency module (transceiver) supporting a 2T2R radio frequency front end supporting N frequency bands simultaneously provided in the embodiment.
  • each multiplexer is used to receive radio frequency signals RX1, RX2, ..., in a plurality of frequency bands.
  • N mixing circuits are used to separately mix the RF signals RX1, RX2, ..., RXN of different frequency bands to different intermediate frequency ranges to obtain intermediate frequency signals IF1 of different frequency ranges of N channels.
  • mixers Mixer1, Mixer2, and MixerN form the N mixer circuits with local oscillators L01, L02, ..., L0N, respectively.
  • Each N-way combiner is configured to combine the intermediate frequency signals of the N different frequency ranges in the frequency domain, combine them into one intermediate frequency signal, and send the combined intermediate frequency signals to a dual-channel ADC for processing.
  • the dual channel ADC is configured to perform analog to digital conversion processing on the IF signals of the combined N frequency bands.
  • the RF signals of different frequency bands are mixed down to different intermediate frequency ranges, and the combined intermediate frequency signals are combined, and the combined intermediate frequency signals are sent to a dual channel ADC for processing, and finally a 2T2R RF module is simultaneously supported. Simultaneous operation of multiple frequency bands greatly reduces the hardware complexity and cost of the RF module, thereby improving reliability and reducing power consumption.
  • the present invention is not limited to 2T2R, and is equally applicable to other multi-receiving systems.
  • the plurality of antenna sets and multi-channel diversity receive radio frequency signals of multiple frequency bands, and the main and multi-channel diversity signals are separately mixed and mixed in the frequency domain after mixing, and
  • the multi-channel ADC is used to combine the N frequency band signals from the main set and the multi-path diversity reception, and the analog frequency conversion processing is performed after the down-mixed and multiplexed intermediate frequency signals.
  • the embodiments of the present invention are applicable not only to the scenes of multiple E-UTRA bands in the 3GPP TS 36.104 protocol, but also to the scenarios of other frequency bands.
  • the technical solution of the present invention can be applied not only in the RRU or RFU radio frequency module of all mobile communication base stations such as GSM, UMTS, LTE, CDMA, but also in the RF front-end architecture in other radio frequency and microwave communication fields when considering multi-band simultaneous operation. .
  • Example 5
  • This embodiment provides a method for supporting multi-band coexistence of a radio frequency module. As shown in FIG. 13, the method includes: Step S1300: Receive radio frequency signals of at least two frequency bands.
  • the RF signals of the at least two frequency bands may be received by using at least two multiplexer main diversity, and the RF signals of each frequency band include a primary set RF signal and a diversity RF signal.
  • Step S1302 Mixing the RF signals of different frequency bands into the different intermediate frequency ranges by the local oscillator to obtain intermediate frequency signals of different frequency ranges corresponding to different frequency bands.
  • the main set RF signal and the diversity RF signal of the same frequency band can be mixed to the same intermediate frequency range through the same local oscillator, and the main set RF signal and the diversity RF signal of different frequency bands are mixed by different local oscillators.
  • Step S1304 Perform frequency domain combining on the intermediate frequency signals of different frequency ranges corresponding to different frequency bands.
  • the multi-channel intermediate frequency signal of the main set and the multi-channel intermediate frequency signals of the diversity are separately combined in the frequency domain to obtain the main collective path signal and the diversity integrated path signal.
  • Step S1306 the combined intermediate frequency signal is sent to an analog to digital converter for intermediate frequency analog to digital conversion processing.
  • the main concentrated frequency signal and the divided concentrated frequency signal are sent to a two-channel analog-to-digital converter for intermediate frequency analog-to-digital conversion processing.
  • the method before step S1304, the method further includes: Step S1303: Perform intermediate frequency filtering on the intermediate frequency signal corresponding to each frequency band. This step can suppress the same frequency blocking signal.
  • step S1306 the method further includes:
  • Step S1305 Perform IF filtering amplification on the combined intermediate frequency signal.
  • the method further includes:
  • Step S1301 analyzing the air interface blocking feedback information, and configuring the frequency of the local oscillator corresponding to each frequency band according to the position of the air interface blocking signal, so as to adjust different frequency ranges corresponding to each frequency band obtained by down-mixing the RF signals of each frequency band.
  • the frequency offset of the IF signal This step can more flexibly suppress the co-channel blocking signal than step 530.

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Description

一种射频模块的支持多频段共存的方法及装置 本申请要求了 2009年 4月 15日提交的， 申请号为 200910132056. 1， 发 明名称为 "一种射频模块的支持多频段共存的方法及装置" 的中国专利申请 的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无线通信技术， 具体地涉及一种射频模块的支持多频段共存 的方法及装置。
背景技术
射频前端作为基站和终端等无线通信设备的重要组成部分， 主要实现对 于无线信号的接收和发射功能， 在无线通信系统中起着举足轻重的作用。 射 频前端一般由发射机和接收机两部分构成， 统称为收发信机 （TRX)。
在民用通信基站中， 不同的频段需要用不同的射频前端模块 （简称射频 模块） 来实现与终端设备之间建立起无线信号的上下行通信。 在第 3代伙伴 计划技术规范（3GPP TS) 36. 104协议中定义了 14种频分双工（FDD, Frequency Division Duplex) 基本频段 (Band): 频段 1〜14， 如表 1所示。
表 1. 14种频分双工 （FDD) 基本频段
Figure imgf000003_0001
11 1427. 9 MHz -1452. 9 MHz 1475. 9 MHz -1500. 9 MHz FDD
12 698 MHz -716 MHz 728 MHz -746 MHz FDD
13 777 MHz -787 MHz 746 MHz -756 MHz FDD
14 788 MHz -798 MHz 758 MHz -768 MHz FDD 目前需要有至少 14种不同频段的射频模块来支撑全球不同频谱资源的需 求。 业界射频模块主要有两种主流型态： 射频拉远单元 （RRU ) 和射频单元 (RFU), 一般地， RRU为用于分布式基站的射频模块， RFU为应用于机柜式基 站的射频模块。 以广域覆盖的宏 RRU和宏 RFU为例， 由于要支持多个频段同 时工作， 常规的做法是用不同频段的射频模块组合在一起来实现多个频段同 时工作。
在实现本发明过程中， 发明人发现现有技术中至少存在如下问题： 随着 宽带化技术的不断发展， 同一射频模块同时支持多频段同时工作已经成为未 来发展的趋势， 但是如何简单地、 低成本地利用一个射频模块实现对两个以 上频段信号的同时处理是一个尚待解决的问题。
发明内容
提供一种射频模块的支持多频段共存的方法及装置， 以简单地利用一 个射频模块实现对两个以上频段信号的同时处理。
为了实现上述目的， 本发明实施例提供一种射频模块的支持多频段共存 的方法， 该方法包括：
接收至少两个频段的射频信号；
将不同频段的射频信号通过本振下混频至不同中频频率范围， 获得不同 频段对应的不同频率范围的中频信号；
将不同频段对应的不同频率范围的中频信号进行频域合并；
将合并后的中频信号送入一个多通道模拟数字转换器进行中频模拟数字 转换处理。
本发明实施例还提供一种射频模块， 该模块包括： 至少一个多工器， 各自用于接收至少两个频段的射频信号； 至少两个混频单元， 用于分别将不同频段的射频信号通过本振下混频至 不同中频频率范围， 获得不同频段对应的不同频率范围的中频信号；
至少一个合路器， 各自用于将每一多工器接收的经下混频后的不同频率 范围的中频信号进行频域合并；
一个模拟数字转换器， 用于将合并后的中频信号进行中频模拟数字转换 处理。
本发明实施例的方法及装置可以简单、 低成本地利用一个射频模块实现 对两个以上频段信号的同时处理。 附图说明
此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部 分， 并不构成对本发明的限定。 在附图中：
图 1为一种支持两个频段的射频模块的结构示意图；
图 2为图 1对应的射频模块的频段特性示意图；
图 3为本发明实施例 1的射频模块的结构示意图；
图 4为本发明实施例 2的射频模块的结构示意图；
图 5为本发明实施例 2的射频模块中实现接收的示意图；
图 6为本发明实施例 2的射频模块中实现混频的示意图；
图 7为本发明实施例 2的射频模块中实现滤波及合并的示意图； 图 8为本发明实施例 2的射频模块中实现同频阻塞干扰的原理示意图； 图 9为本发明实施例 2的射频模块中实现模拟数字转换处理的示意图； 图 10为本发明实施例 3的射频模块的结构示意图；
图 11为本发明实施例 3的射频模块中实现同频阻塞干扰的原理示意图； 图 12为本发明实施例 4的射频模块的结构示意图；
图 13 为本发明实施例 5 中一种射频模块的支持多频段共存的方法流程 图；
图 14为本发明实施例 5中另一种射频模块的支持多频段共存的方法流程 图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚， 下面结合附图对本发明 的具体实施例进行详细说明。 在此， 本发明的示意性实施例及其说明用于解 释本发明， 但并不作为对本发明的限定。
3GPP TS 36. 104协议中， 频段 12-频段 14这连续三个频段的发射频段靠 得很近， 带宽 40MHz， 接收频段分离得较远， 跨度 100MHz。 这种场景下， 可 以相对容易地实现用一个射频模块支持两个或多个频段同时工作， 本发明实 施例以对频段 12至频段 14中的两个以上 （包括两个） 频段的处理为例来进 行说明。
下面先介绍一种能够实现同时处理两个频段（例如频段 12及频段 13 )的 射频模块 （收发信机） 的结构。 如图 1所示， 该射频模块 110为采用三工器 的 2T2R (双发双收） 射频模块。 该射频模块的频段特性如图 2所示， 射频模 块中三工器的发射频段频率范围为： FTX=FTX1 +FTX2， 其中 FTX1为频段 12 内的发射频率范围， FTX2为频段 13内的发射频率范围。三工器的发射部分用 一个发射腔体带通滤波器 （未图示） 直接覆盖整个 FTX 的频率范围， 同时实 现对接收频段 FRX1和 FRX2的抑制。 三工器的接收部分用两个接收带通腔体 滤波器 （未图示）， 频率范围分别为 FRX1 (频段 12的接收频率范围）和 FRX2 (频段 13 的接收频率范围）， 该两个接收带通腔体滤波器同时可以实现对发 射频段 FTX的抑制。 图 1中， 一个三工器有一个发射腔、 两个接收腔及四个 接口： 一个 ANT (天线）接口， 一个与发射腔之间的接口， 两个与接收腔之间 的接口。 对于 2T2R接收模式， 具有两个三工器， 相应地具有： 两个发射腔， 四个接收腔， 两个天线接口 ANTA、 ANTB, 两个与发射腔之间的接口， 四个与 接收腔之间的接口。
图 1中， 整个 FTX频率范围的下行发射信号 TX， 经过放大后分别通过 天线接口 ΑΝΤΑ和天线接口 ΑΝΤΒ发射出去， 两路信号之间可以形成发射分集。 在多模多载波系统中， 受制于整个模块的功耗， 还可以将不同模式的信号或 者将多个载波拆分成两部分， 分别从 ΑΝΤΑ和 ΑΝΤΒ发射出去。
对于接收， 收发信机利用三工器的接收腔接收来自 ΑΝΤΑ和 ΑΝΤΒ的频 段 12的两路信号 RX1， 形成主分集接收， 经过滤波的两路主分集信号 RX1通 过同一个本振信号将射频信号下混频到相同频率范围的中频信号上， 经过中 频滤波器后送给一个双通道 ADC进行模拟数字转换处理。对来自 ANTA和 ANTB 的频段 13的两路信号 RX2的接收和处理过程和信号 RX1相同， 中频信号经过 滤波后送给另一双通道 ADC进行模拟数字转换处理。
通过图 1 所示的收发信机结构实现了一个射频模块对于两个频段信号的 同时处理。
但如上的射频模块， 为了实现同时处理两个频段的信号， 除了用到本振 外， 需要用到 4个独立的接收通道、 两个双通道 ADC， 不仅接收机结构复杂， 硬件规模大， 成本高， 而且随着硬件规模的增大， 器件数目相应增多， 所以 同时还带来可靠性低， 功耗大等问题。
基于此， 本发明实施例中， 对如上射频模块的结构进行改造， 通过巧妙 的设计接收机形式的变化， 来降低射频模块 TRX结构的复杂度和成本， 并提 升射频模块的可靠性， 同时降低功耗。
下面对本发明实施例的射频模块及其对应的实现方法进行详细说明。 实施例一
本实施例提供一种能够实现同时处理两个以上波段的射频模块 （收发信 机）。
该射频模块 310的结构如图 3所示， 包括： 至少一个多工器， 各自用于接收至少两个频段的射频信号。 在接收两个 频段的射频信号时， 上述多工器例如可为三工器， 在接收三个频段的射频信 号时， 该多工器例如可为四工器， 在接收四个频段的射频信号时， 该多工器 例如可为五工器， 但本发明并不限于此。 在采用两个以上 （包括两个） 的多 工器时， 所述两个以上的多工器接收的射频信号形成主分集接收， 即该两个 以上多工器接收的射频信号分别为主集和分集射频信号。
至少两个混频单元， 分别用于将不同频段的射频信号通过本振下混频至 不同中频频率范围， 获得不同频段对应的不同频率范围的中频信号。 前述混 频单元可包括混频器和本振。 在多工器接收两个频段的射频信号时， 所述射 频模块可以包括两个混频单元， 如图 3中 Mixerl和 Mixer2，用于分别将每一 频段的射频信号通过本振进行下混频， 获得两个频段对应的不同频率范围的 两路中频信号， 两路中频信号的频率范围分别为 IF1和 IF2。
至少一个合路器， 各自用于将每一多工器接收的经混频后的不同频率范 围的中频信号进行频域合并。 例如， 将频率范围分别为 IF1和 IF2的两路中 频信号进行频域合并， 即频谱合成， 合并成一个频谱较宽的中频信号， 频域 合并后的中频信号的频率范围为 IF1 + IF2。
多通道模拟数字转换器 （ADC)， 用于将频域合并后的中频模拟信号进行 模拟数字转换处理。 该 ADC例如为一片包括双通道或更多通道的多通道 ADC， 以将频域合并后的中频模拟信号进行模拟数字转换处理。 对于 ADC来说， 只 要中频模拟信号的频率范围在 ADC处理工作带宽范围内， 那么无论是窄带， 如频率范围为 IF1或者 IF2， 还是宽带， 如频率范围为 IF1+IF2, 其处理过程 和原理都是相同的， 因此在此不进行过多描述。
通过如上射频模块， 利用一片双通道或多通道 ADC就可以对多频段接收 信号进行同时处理， 大大简化了接收机的复杂度， 降低了硬件规模及成本， 从而使可靠性得到提升， 功耗也随之降低。 实施例 2
本实施例提供一种支持两频段的 2T2R (2发 2收）射频模块（收发信机）。 该射频模块结合当前的三工器技术实现两个频段的同时处理。 本实施例的采 用三工器的射频模块如图 4所示。
在图 4所示的射频模块 410包括： 两个三工器、 两个混频电路、 两个合 路器及一个双通路 ADC。
其中，每一三工器用于接收不同频段的射频信号 RX1和 RX2。两个三工器 接收的射频信号形成主分集接收， 即两个三工器接收的射频信号分别为主集 和分集信号。
两个混频电路， 用于分别将主分集信号进行混频处理。 如图 4所示， 混 频器 Mixerl、 Mixer2分别与本振 L01、 L02组成所述两个混频电路。 该两个 混频电路分别将不同频段的射频信号， 如 RX1和 RX2， 下混频到不同的中频频 率范围上， 获得两路不同频率范围的中频信号， 该两路中频信号的频率范围 分别为 IF1和 IF2。
每一合路器用于将该两路不同频率范围的中频信号进行频域合并， 即频 谱合成， 合并成一个频谱较宽的中频信号， 频域合并后的中频信号的频率范 围为 IF1 + IF2。 合路器将频域合并后的整个中频信号送入一片双通道 ADC进 行处理。
所述双通道 ADC用于对所述合并后的中频模拟信号进行模拟数字转换处 理， 将模拟信号转换为数字信号。
该结构大大降低复杂度， 节约了硬件规模及成本， 从而使可靠性得到提 升， 功耗也随之降低。
本实施例中是采用了 2个三工器实现 2T2R,每一三工器具有一个发射腔、 两个接收腔、 以及四个接口： 一个天线接口 （ANTA或 ANTB), —个与发射机 TX之间的接口， 两个与接收机 RX之间的接口。 图 4中的两个三工器分别接收 来自 ANTA和 ANTB的两路信号， 形成主分集接收。 本实施例中三工器对发射信号的处理同前述射频模块 110 中三工器对 发射信号的处理。
本实施例射频模块的实现原理如下：
( 1 )如图 5所示， 三工器接收来自天线接口 ANTA和 ANTB的两个频段的 射频信号， 经过三工器的主分集接收腔体滤波器 （未图示） 后， 形成频域独 立的射频信号 RX1和 RX2。
(2)如图 6所示， 射频信号 RX1和 RX2经过放大器的射频放大后， 分别 利用不同混频电路， 将射频信号 RX1和 RX2分别下混频到具有一定带宽的不 同频率范围中频信号上。
每一混频电路可包括混频器及本振， 不同混频电路可对应不同的本振。 这样射频信号 RX1和 RX2可通过混频器及两个不同的射频本振分别下混频到 不同频率范围上， 混频后的中频信号的频率范围分别为 IF1和 IF2。
(3)如图 7所示， 利用中频滤波器 BPF1和 BPF2对混频后的两路中频信 号分别进行中频滤波。
两个频段信号共存时， 一个频段的阻塞信号可能会成为另一个频段阻塞 信号的同频干扰， 中频通道的滤波器 BPF1和 BPF2可用于抑制同频干扰， 滤 波器 BPF1和 BPF2对于同频干扰的抑制度可按照中频镜频抑制度的要求来考 虑。
以信号 RX1的阻塞信号对信号 RX2造成干扰的过程为例， 可以体现出滤 波器的作用：
如图 8所示， 信号 RX1所在频段存在阻塞信号， 信号 RX1和 RX2分别经 过混频后， 获得频率范围分别为 IF1和 IF2的中频信号， 此时存在的阻塞信 号会对频率范围为 IF2 的信号造成同频干扰。 而将两路中频信号别通过中频 滤波器 BPF1和 BPF2进行滤波后， 阻塞信号基本上被过滤掉， 因此有效得抑 制了阻塞信号对频率范围为 IF2的信号的同频干扰。
(4)如图 7所示， 两路中频信号分别经过中频滤波后， 用合路器进行频 域合并， 合并为一路中频信号。
合路器用于对两路中频信号进行频域合并， 即合并两路中频信号的频谱， 从而获得频率范围为 IF1 + IF2的一路中频信号。 合并后的中频信号可以采用 一个放大滤波电路进行滤波放大。
(4)如图 9所示， 合并后的中频信号的主分集信号同时送入一片双通道 ADC进行处理。
所述双通道 ADC例如可采用目前 ADI公司的 AD6655模数转换芯片。 随着 ADC处理带宽的不断增加， 可以对更多频段的信号同时进行处理。
由于采用一片双通道 ADC来处理两个频段主分集接收信号， 本发明实施 例中的 4个接收通道并不是独立的接收通道， 降低了接收机结构的复杂度。
如上所述的本实施例的射频模块， 通过巧妙的变化收发信机中接收机的 结构， 将不同频段的射频信号下混频到不同的中频频率范围上， 合并接收中 频信号， 将合并后的中频信号送入一片双通道 ADC进行处理， 最终实现了一 个 2T2R射频模块同时支持多个频段同时工作。 由于利用一片双通道 ADC来支 持对两个频段主分集接收信号的同时处理， 因此本发明实施例大大降低了射 频模块硬件复杂度， 节约了成本， 并降低了功耗。 应用本发明， 对于多发多 收系统会有更大的成本优势。 随着 ADC并行处理通道数的增加以及处理带宽 的增加， 这一优势将更加突出。 实施例 3
本实施例另提供一种支持两频段的 2T2R射频模块 （收发信机）。
在实施例 2的射频模块中， 设置了中频滤波器 BPF1、 BPF2来解决同频阻 塞干扰问题， 但是设置中频滤波器 BPF1、 BPF2后增加了通道的复杂度。 因此 本实施例中， 无需设置中频滤波器 BPF1、 BPF2, 而通过适当配置本振 L01、 L02 的频率， 来抑制同频阻塞干扰。 本实施例中的射频模块的结构框图如图 10所示。 本实施例中的射频模块 510与实施例 2的射频模块 410的区别在于： 没 有设置中频滤波器 BPF1、 BPF2, 而为每一频段对应的本振设置了一个本振调 整单元， 分别为 011和 021。
所述本振调整单元 011和 021，用于分析空口阻塞反馈信息，根据空口阻 塞反馈信息中空口阻塞信号的位置调整每一频段对应的本振的频率， 以调整 对每一频段的射频信号进行下混频后获得的中频信号的频率偏移， 来避免同 频阻塞干扰。 所述本振调整单元可以为软件功能模块， 通过软件配置来实现。
图 11为利用本振调整单元来配置本振， 实现对阻塞信号的抑制的过程示 意图。 图中可以看出， 通过适当配置本振 L01、 L02的频率， 增大或者减小， 将阻塞干扰放置在 BPF3通带以外， 从而抑制同频阻塞干扰。 图 11与图 10相 比， 中频信号 IF1与 IF2的相对位置发生了变化。 本实施例的结构及所采用 的方法更加灵活， 可以根据空口阻塞的实际情况变化， 自适应实现对于同频 阻塞信号的抑制。 实施例 4
如上实施例 2和 3提供的是能够同时对两个频段的信号进行接收的射频 模块， 但本发明并不限于此， 本发明同样能够解决同时对三个或更多个频段 进行处理的问题。
图 12所示为本实施例提供的支持 N个频段同时工作的 2T2R射频前端的 射频模块 （收发信机） 610架构示意图。
如图 12所示，每一多工器用于接收多个频段的射频信号 RX1、 RX2、……、
N个混频电路用于分别将该不同频段的射频信号 RX1、 RX2、 ……、 RXN下 混频到不同的中频频率范围上， 获得 N 路不同频率范围的中频信号 IF1、
IF2、 、 IFNo 图 12中， 混频器 Mixerl、 Mixer2、 、 MixerN分别与 本振 L01、 L02、 ……、 L0N组成所述 N个混频电路。 每一 N路合路器用于将所述 N路不同频率范围的中频信号进行频域合并， 合并为一路中频信号， 将合并后的整个中频信号送入一片双通道 ADC进行处 理。
所述双通道 ADC用于对所述合并后的 N个频段的中频信号进行模拟数字 转换处理。
本发明实施例将不同频段的射频信号下混频到不同的中频频率范围上， 合并接收中频信号， 将合并后的中频信号送入一片双通道 ADC进行处理， 最 终实现了一个 2T2R射频模块同时支持多个频段同时工作，大大降低了射频模 块硬件复杂度即成本， 从而使可靠性得到提升， 并降低了功耗。
虽然如上实施例是以 2T2R射频模块为例进行的说明， 但本发明并不限定 于 2T2R, 而同样适用于其他多发多收系统。 应用于多发多收系统时， 通过多 根天线主集、 多路分集接收多个频段的射频信号， 对所述主、 多路分集信号 分别进行混频及混频后频域的合并处理， 并利用一个多通道 ADC对合并后的 来自于主集、 多路分集接收的 N个频段射频信号， 经过下混频并经过合路后 的中频信号进行模拟数字转换处理。 应用本发明， 对于多发多收系统会有更 大的成本优势。 随着 ADC并行处理通道数的增加以及处理带宽的增加， 这一 优势将更加突出。
本发明实施例不仅适用于 3GPP TS 36. 104协议中多个 E-UTRA频段的场 景， 同样适用于其他频段频谱的场景。
本发明技术方案不仅可以应用在 GSM、 UMTS, LTE、 CDMA等所有移动通信 基站的 RRU或者 RFU射频模块中， 同样可以应用在考虑多频段同时工作时的 其他射频、 微波通信领域的射频前端架构中。 实施例 5
本实施例提供一种射频模块的支持多频段共存的方法， 如图 13所示， 该 方法包括： 步骤 S 1300, 接收至少两个频段的射频信号。
在 2T2R系统中， 可利用至少两个多工器主分集接收所述至少两个频段的 射频信号， 每一频段的射频信号包括主集射频信号和分集射频信号。
步骤 S1302 , 将不同频段的射频信号通过本振下混频至不同中频频率范 围， 获得不同频段对应的不同频率范围的中频信号。
在 2T2R系统中， 可将同一频段的主集射频信号和分集射频信号通过相同 本振下混频至相同中频频率范围， 将不同频段的主集射频信号和分集射频信 号通过不同本振下混频至不同中频频率范围， 获得不同频段对应的不同频率 范围的主集和分集中频信号。
步骤 S 1304, 将不同频段对应的不同频率范围的中频信号进行频域合并。 对于 2T2R系统， 可分别将主集的多路中频信号及分集的多路中频信号进 行频域合并， 获得主集合路信号及分集合路信号。
步骤 S1306,将合并后的中频信号送入一个模拟数字转换器进行中频模拟 数字转换处理。
对于 2T2R系统， 将所述主集中频信号及分集中频信号送入一个双通道模 拟数字转换器进行中频模拟数字转换处理。
本发明另一实施例中， 步骤 S1304之前还包括： 步骤 S1303, 对各频段对 应的中频信号进行中频滤波。 该步骤可以抑制同频阻塞信号。
本发明另一实施例中， 步骤 S1306之前还包括：
步骤 S1305, 将合并后的中频信号进行中频滤波放大。
本发明另一实施例中， 如图 14所示， 步骤 S1302之前还包括：
步骤 S 1301 , 分析空口阻塞反馈信息， 根据空口阻塞信号的位置配置每一 频段对应的本振的频率， 以调整对每一频段的射频信号进行下混频后获得的 各频段对应的不同频率范围中频信号的频率偏移。 该步骤可以比步骤 530更 加灵活地抑制同频阻塞信号。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 可以通过程序来指令相关的硬件来完成， 该程序可以存储于一计算机可读取 存储介质中， 比如 R0M/RAM、 磁碟、 光盘等。
可以理解的是， 本发明实施例中的序号用于使具体实施例的描述更清楚， 并不代表方案的优劣。
以上所述的具体实施例， 对本发明的目的、 技术方案和有益效果进行了 进一步详细说明， 所应理解的是， 以上所述仅为本发明的具体实施例而已， 并不用于限定本发明的保护范围， 凡在本发明的精神和原则之内， 所做的任 何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、 一种支持多频段共存的方法， 其特征在于， 该方法包括：
接收至少两个频段的射频信号；
将所述接收到的不同频段的射频信号通过本振下混频至不同中频频率范 围， 获得不同频段对应的不同频率范围的中频信号；
将所述不同频段对应的不同频率范围的中频信号进行频域合并；
将所述合并后获得的的中频信号通过一个多通道模拟数字转换器进行模拟 数字转换。
2、 根据权利要求 1所述的方法， 其特征在于， 将不同频段对应的不同频率 范围的中频信号进行频域合并之前还包括：
对所述不同频段对应的中频信号进行中频滤波。
3、 根据权利要求 2所述的方法， 其特征在于， 在将不同频段对应的不同频 率范围的中频信号进行频域合并之后还包括： 对合并后的中频信号进行滤波放 大。
4、 根据权利要求 1所述的方法， 其特征在于， 将不同频段的射频信号通过 本振下混频至不同中频频率范围之前还包括： 根据空口阻塞信号的位置调整每 一频段对应的本振的频率；
所述将不同频段对应的不同频率范围的中频信号进行频域合并之后， 还包 括： 对频域合并之后的信号进行中频滤波。
5、 根据权利要求 1至 4任意一项所述的方法， 其特征在于， 所述接收至少 两个频段的射频信号包括：
利用至少两个多工器主分集接收所述至少两个频段的射频信号， 每一频段 的射频信号包括主集射频信号和分集射频信号。
6、 根据权利要求 5所述的方法， 其特征在于， 所述将不同频段的射频信号 通过本振下混频至不同中频频率范围， 获得不同频段对应的不同频率范围的中 频信号的过程， 包括： 将同一频段的主集射频信号和分集射频信号通过本振下混频至相同中频频 率范围， 获得所述不同频段对应的不同频率范围的主集和分集中频信号。
7、 根据权利要求 6所述的方法， 其特征在于， 所述将不同频段对应的不同 频率范围的中频信号进行合并包括：
分别将主集中频信号和分集中频信号中不同频率范围的中频信号进行频域 合并， 获得主集合路信号及分集合路信号。
8、 根据权利要求 7所述的方法， 其特征在于， 所述将合并后的中频信号送 入一个多通道模拟数字转换器进行中频模拟数字转换处理包括：
将所述主集合路信号及分集合路信号通过一个多通道模拟数字转换器进行 中频模拟数字转换。
9、 一种射频模块， 其特征在于， 包括：
至少一个多工器， 各自用于接收至少两个频段的射频信号；
至少两个混频单元， 分别用于将所述多工器接收的不同频段的射频信号通 过本振下混频至不同中频频率范围， 获得不同频段对应的不同频率范围的中频 信号；
至少一个合路器， 各自用于将所述每一多工器接收的经下混频后的不同频 率范围的中频信号进行频域合并；
一个模拟数字转换器， 用于将合并后的中频信号进行中频模拟数字转换。
10、 根据权利要求 9所述的射频模块， 其特征在于， 还包括：
至少两个第一中频滤波器， 各自连接在一混频单元和合路器之间， 用于对 各频段对应的中频信号进行中频滤波。
11、 根据权利要求 10所述的射频模块， 其特征在于， 还包括：
至少一个第二中频滤波器， 各自用于对经过每一所述合路器合并后的中频 信号进行滤波放大后送入模拟数字转换器。
12、 根据权利要求 9所述的射频单元， 其特征在于， 还包括：
本振调整单元， 用于根据空口阻塞信号的位置调整每一频段对应的本振的 频率；
至少一个第二中频滤波器， 各自连接在合路器和模拟数字转换器之间， 用 于对所述合路器进行频域合并后的信号进行中频滤波。
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