CN109412655B - Distributed antenna system, IQ data adapting device and method thereof - Google Patents
Distributed antenna system, IQ data adapting device and method thereof Download PDFInfo
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Abstract
The application relates to a distributed antenna system, and IQ data adapting device and method thereof, comprising a downlink IQ data adapting device and an uplink IQ adapting device. The downlink IQ data adaptation device comprises a downlink IQ data adaptation processing module, a first frame decoding module, a first switch selection module, a first resampling module and a first frame group module; the uplink IQ data adaptation device comprises an uplink IQ data adaptation processing module, a second frame decoding module, a second switch selection module, a second resampling module and a second frame group module; and the downlink IQ data adaptation apparatus and the uplink IQ data adaptation apparatus can be applied in the extension unit EU. IQ data of different channels, different frequency bands, different bandwidths and different sampling rates are acquired from different access units AU through introducing a resampling module, and after IQ data adaptation and resampling processing, the IQ data of a specific channel, a specific frequency band, a specific bandwidth and a specific sampling rate are sent to a remote unit RU, so that the deployment flexibility of the digital DAS is expanded.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a distributed antenna system, and an IQ data adaptation apparatus and method thereof.
Background
With the development of communication technology, communication frequency bands are more and more, bandwidths are wider and the number of antennas is more and more, and for better signal coverage, the application of a digital Distributed Antenna System (DAS) is more and more widespread.
The digital DAS system mainly comprises three parts, namely an Access Unit (AU), an Extension Unit (EU) and a Remote Unit (RU). Firstly, in an access unit, a digital base station information source is obtained by means of data access or radio frequency coupling signals; transmitting the base station information source to a plurality of remote units by using optical fibers or network cables in the expansion unit; finally, at the remote unit, the signal is reconverted to a radio frequency signal for cell coverage.
As the types of the access unit and the remote unit are more and more, the sampling rate relationship of the IQ data is more and more complex, and the extension unit simply distributes the IQ data of the access unit to the remote unit, which cannot meet the requirements of the development of the digital DAS technology.
Disclosure of Invention
Based on this, it is necessary to provide a distributed antenna system, an IQ data adaptation apparatus and a method thereof, aiming at the technical problem that the expansion unit of the distributed antenna system in the conventional technology cannot meet the development requirement of the digital DAS technology.
In one aspect, an embodiment of the present invention provides a downlink IQ data adaptation apparatus for a distributed antenna system, where the apparatus includes:
the downlink IQ data adaptation processing module is used for reading access unit information from the access unit and reading remote unit information from the remote unit;
the first de-framing module is used for de-framing the first multichannel serial IQ data stream obtained through the access unit according to the access unit information to obtain a first single-channel parallel IQ data stream;
the first switch selection module is used for establishing a corresponding data communication link according to the access unit information and the remote unit information so as to obtain a corresponding first single-channel parallel IQ data stream;
the first resampling module is used for receiving the corresponding first single-channel parallel IQ data stream and resampling the corresponding first single-channel parallel IQ data stream to obtain a second single-channel parallel IQ data stream;
and the first framing module is used for framing the resampled second single-channel parallel IQ data stream according to the remote unit information to obtain a second multi-channel serial IQ data stream.
In one aspect, an embodiment of the present invention further provides an uplink IQ data adaptation apparatus for a distributed antenna system, including:
The uplink IQ data adaptation processing module is used for reading access unit information from the access unit and reading remote unit information from the remote unit;
the second de-framing module is used for de-framing the third multichannel serial IQ data stream obtained by the remote unit according to the remote unit information to obtain a third single-channel parallel IQ data stream;
the second resampling module is used for receiving the obtained third single-channel parallel IQ data stream and resampling the obtained third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream;
the second switch selection module is used for establishing a corresponding data communication link according to the access unit information and the remote unit information so as to obtain a corresponding fourth single-channel parallel IQ data stream;
and the second framing module is used for framing the corresponding fourth single-channel parallel IQ data stream according to the access unit information to obtain a fourth multi-channel serial IQ data stream.
In yet another aspect, an embodiment of the present invention provides a distributed antenna system, including: an access unit, an extension unit in communication with the access unit, and a remote unit in communication with the extension unit; the expansion unit includes the downlink IQ data adaptation apparatus described in any of the above embodiments and the uplink IQ data adaptation apparatus described in any of the above embodiments.
In yet another aspect, an embodiment of the present invention provides a downlink IQ data adaptation method for a distributed antenna system, where the method includes:
reading access unit information from the access unit and remote unit information from the remote unit;
according to the access unit information, de-framing the first multichannel serial IQ data stream obtained by the access unit to obtain a first single-channel parallel IQ data stream;
establishing a corresponding data communication link according to the access unit information and the remote unit information to obtain a corresponding first single-channel parallel IQ data stream;
resampling the corresponding first single-channel parallel IQ data stream to obtain a second single-channel parallel IQ data stream;
and framing the resampled second single-channel parallel IQ data stream according to the remote unit information to obtain a second multi-channel serial IQ data stream.
In another aspect, an embodiment of the present invention provides an uplink IQ data adaptation method for a distributed antenna system, including:
reading access unit information from the access unit and remote unit information from the remote unit;
according to the remote unit information, de-framing a third multi-channel serial IQ data stream obtained by the remote unit to obtain a third single-channel parallel IQ data stream;
Resampling the obtained third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream;
establishing a corresponding data communication link according to the access unit information and the remote unit information to obtain a corresponding fourth single-channel parallel IQ data stream;
and framing the corresponding fourth single-channel parallel IQ data stream according to the access unit information to obtain a fourth multi-channel serial IQ data stream.
Any one of the technical schemes has the following advantages and beneficial effects:
by introducing an IQ data resampling mechanism, conversion between sampling rates of uplink IQ data and downlink IQ data is realized, and IQ data adaptation can be performed on different types of access units and remote units, so that the deployment flexibility of the digital DAS is improved.
Drawings
FIGS. 1 a-1 c are block diagrams of the structure of a digitized distributed antenna system;
fig. 1d is a block diagram of a distributed antenna system according to the present invention;
fig. 2a is a block diagram of a downlink IQ data adaptation apparatus according to an embodiment;
fig. 2b is a schematic structural diagram of a downlink IQ data adaptation apparatus according to an embodiment;
fig. 3a is a block diagram of a downlink IQ data adaptation apparatus according to an embodiment;
Fig. 3b is a schematic structural diagram of a downlink IQ data adaptation apparatus according to an embodiment;
fig. 4 is a schematic structural diagram of a downlink IQ data adaptation apparatus according to an embodiment;
FIG. 5a is a block diagram illustrating an exemplary embodiment of an uplink IQ data adaptation device;
fig. 5b is a schematic structural diagram of an uplink IQ data adaptation apparatus according to an embodiment;
FIG. 6a is a block diagram illustrating an exemplary embodiment of an uplink IQ data adaptation device;
fig. 6b is a schematic structural diagram of an uplink IQ data adaptation apparatus according to an embodiment;
FIG. 7a is a block diagram illustrating an exemplary embodiment of an uplink IQ data adaptation device;
fig. 7b is a schematic structural diagram of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 8 is a flow chart of a downlink IQ data adaptation method according to an embodiment;
fig. 9 is a flow chart of a downlink IQ data adaptation method according to an embodiment;
fig. 10 is a flow chart of an uplink IQ data adaptation method according to an embodiment;
fig. 11 is a flowchart of an uplink IQ data adaptation method according to an embodiment.
Detailed Description
As mentioned in the background, as the types of access units and remote units are more and more, the requirements of users for flexibility in application of the digital DAS are also more and more. Referring to fig. 1a, the digital DAS system mainly includes three parts, namely an access unit AU, an extension unit EU and a remote unit RU.
Referring to fig. 1b, the access unit AU obtains a digitized IQ data stream by means of Radio Frequency (RF) coupling or digital (digital) coupling, wherein S1 is denoted as the 1 st channel IQ data, S2 is denoted as the 2 nd channel IQ data, sk is denoted as the kth channel IQ data, and each channel IQ data corresponds to an independent frequency band, sampling rate, bandwidth, and other information. Definition of the definitionFor all IQ data sent by the access unit AU to the extension unit EU, the extension unit EU distributes the acquired IQ data of the access unit AU to the corresponding remote unit RU. />IQ data, denoted as extension unit EU, sent to the 1 st remote unit RU +.>IQ data, denoted as extension unit EU, sent to the nth remote unit RU +.>Represented as IQ data sent by the extension unit EU to all remote units RU. Generally, a +>Is->Subset of (a), i.e.)>Therefore, the remote unit RU only needs to simply distribute IQ data of the access unit AU to the remote unit RU. It will be appreciated that the IQ data flow in fig. 1b is bi-directional, and for downstream signals the data flow is: bs→au→eu→ru, and for the uplink signal, the data flow is: ru→eu→au→bs.
However, with the development of wireless communication technology, the digital DAS needs not only network coverage for a single operator and network coverage for multiple operators, but also network coverage for a SISO system and network coverage for a MIMO system, and more needs network coverage for multi-band, multi-system signals. Therefore, the sampling rate relationship of the IQ data is more and more complex, and the extension unit EU simply distributes the IQ data of the access unit to the remote unit, which cannot meet the requirements of the digital DAS technology development. In order to meet the requirements of digital DAS technology development, the invention provides a distributed antenna system, an IQ data adaptation device and a method thereof, which can perform IQ data adaptation between an access unit AU and a remote unit RU, so that an extension unit EU can be compatible with different types of access units AU and remote units RU, and can conveniently support access of new access unit AU equipment and new remote unit RU equipment.
Referring to fig. 1c, different access unit AU devices acquire IQ data of different base station BS devices, the access unit AU transmits the IQ data to the extension unit EU, the extension unit EU performs IQ data adaptation, and then the adapted IQ data is transmitted to the corresponding remote unit RU. Definition of the definitionDefine +.>For data of the 1 st access unit AU to be sent to the remote unit RU +.>Data sent to the remote unit RU for the mth access unit AU. Generally, in the general digital DAS topology, < - > the +.>No longer is +.>Of (a), i.e.)Therefore, referring to fig. 1d, the extension unit EU cannot simply distribute the IQ data of the access unit AU to the remote unit RU, but rather needs to introduce an IQ data adaptation device (IQ Adapter), through which the IQ data of the access unit AU can be transmitted to the remote unit RU after data adaptation.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
In one embodiment, referring to fig. 2a, a downlink IQ data adaptation apparatus for a distributed antenna system is provided, which includes a downlink IQ data adaptation processing module 210, a first de-framing module 220, a first switch selection module 230, a first resampling module 240 and a first framing module 250.
Specifically, the downlink IQ data adaptation processing module 210 is configured to read access unit information from an access unit and remote unit information from a remote unit. The first de-framing module 220, connected to the output end of the downlink IQ data adaptation processing module 210, is configured to de-frame the first multi-channel serial IQ data stream obtained by the access unit according to the access unit information, so as to obtain a first single-channel parallel IQ data stream. The first switch selection module 230, which is connected to the output end of the first deframer module 220, is configured to establish a corresponding data communication link according to the access unit information and the remote unit information, so as to obtain a corresponding first single-channel parallel IQ data stream. The first resampling module 240, which is connected to the output end of the first switch selection module 230, is configured to receive the corresponding first single-channel parallel IQ data stream, and resample the corresponding first single-channel parallel IQ data stream to obtain a second single-channel parallel IQ data stream. And the first framing module 250 is connected to the output end of the first resampling module 240, and is configured to frame the resampled second single-channel parallel IQ data stream according to the remote unit information to obtain a second multi-channel serial IQ data stream.
For example, referring to fig. 2b, the IQ data adaptation apparatus of the downlink includes m first Deframer modules 220, 1 first Switch selection module 230 (Switch), t×n first resampling modules 240 (Resampler), n first frame modules 250 (Framer), and 1 downlink IQ data adaptation processing module 210. The downlink IQ data provided to the remote unit RU has t channels. Specifically, the first deframer module 220 receives the first multi-channel serial IQ data stream through the access unit AU, and decomposes the first multi-channel serial IQ data stream into a first single-channel parallel IQ data stream. According to the channel information in the access unit information and the channel information in the remote unit information, the downlink IQ data adaptation processing module 210 controls the first switch selection module 230 to connect the corresponding channels and establish a corresponding data communication link to obtain a corresponding first single-channel parallel IQ data stream, i.e. selects the first single-channel parallel IQ data stream to be sent to the remote unit RU. The corresponding first single channel parallel IQ data stream is sent to the corresponding first resampling module 240. The first resampling module 240 resamples the corresponding first single-channel parallel IQ data stream to obtain a second single-channel parallel IQ data stream according to the sampling rate and the frequency band in the remote unit information, and sends the second single-channel parallel IQ data stream to the first framing module 250. According to the channel information in the remote unit information, the first framing module 250 combines the resampled second single-channel parallel IQ data stream to obtain a second multi-channel serial IQ data stream, and sends the second multi-channel serial IQ data stream to the corresponding remote unit RU. It can be appreciated that the downlink IQ data adaptation processing module 210 is connected to the first deframer module 220, the first switch selection module 230, the first resampling module 240 and the first framing module 250, so as to control the downlink IQ data adaptation processing module to work to complete the whole process of downlink IQ data adaptation.
With continued reference to figure 2b,represented as downlink IQ data streams, all access units AU are fed to the extension unit EU. Wherein (1)>A first multi-channel serial IQ data stream, denoted as 1 st access unit AU, sent to extension unit EU,/o>A first multi-channel serial IQ data stream denoted as mth access unit AU is sent to the extension unit EU. />And decomposing by a corresponding first frame-removing module Deframer_d1 to obtain a plurality of first single-channel parallel IQ data streams, which are S11_d, S12_d, … and S1k_d respectively. />Through corresponding toThe first Deframer dm is decomposed to obtain a plurality of first single-channel parallel IQ data streams, which are sm1_d, sm2_d, … and smk_d respectively.
With continued reference to fig. 2b, the downlink IQ data adaptation processing module 210 controls the first switch selection module 230 to connect the corresponding channels and establish a corresponding data communication link to select the first single-channel parallel IQ data stream to be sent to the remote unit RU.Represented as IQ data streams that need to be sent to all remote units RU. />For IQ data streams that need to be sent to the 1 st remote unit RU,is an IQ data stream that needs to be sent to the nth remote unit RU.
With continued reference to fig. 2b, the first single-channel parallel IQ data streams required to be sent to the 1 st remote unit RU are w11_d, w12_d, …, w1t_d, and the first single-channel parallel IQ data streams required to be sent to the nth remote unit RU are wn1_d, wn2_d, …, wnt_d. Each path of first single-channel parallel IQ data stream is correspondingly provided with a first switch selection module rescmpler, for example, the first single-channel parallel IQ data stream w11_d is sent to the rescmpler_d11 to be subjected to resampling processing, so as to obtain a second single-channel parallel IQ data stream o11_d. The resampled IQ data stream is denoted as Wherein (1)>A second single-channel parallel IQ data stream, denoted extension unit EU, sent to the 1 st remote unit RU,>represented as an extension unit EU to nthThe second single channel parallel IQ data stream of the remote unit RU.
In fig. 2b, the information read by the extension unit EU from the access unit AU is indicated as AU Message, and includes information such as a channel, a frequency band, a sampling rate, and a bandwidth corresponding to the IQ data stream sent by the access unit AU. RU Message is information read by the extension unit EU from the remote unit RU, and includes information such as channels, frequency bands, sampling rates, and bandwidths of IQ data to be sent to the remote unit RU.
The downlink IQ data adaptation apparatus includes a downlink IQ data adaptation processing module, a first frame decoding module, a first switch selection module, a first resampling module and a first framing module, and the downlink IQ data adaptation apparatus may be applied in the extension unit EU. By introducing the first resampling module, in the downlink, IQ data streams with different channels, different frequency bands, different bandwidths and different sampling rates can be obtained from different access units AU, and after IQ data adaptation and resampling processing, IQ data with specific channels, specific frequency bands, specific bandwidths and specific sampling rates are sent to the remote units RU. And the automatic adaptation of IQ data flow between the access unit AU equipment and the remote unit RU equipment with different channels, different frequency bands, different sampling rates and different bandwidths is realized.
In one embodiment, referring to fig. 3a, the downlink IQ data adaptation apparatus further comprises a first filter coefficient memory 310. The first filter coefficient memory 310 is configured to store the first filter coefficients required by the first resampling module 240. The first filter coefficient memory 310 is connected to the downlink IQ data adaptation processing module 210, and the downlink IQ data adaptation processing module 210 is further configured to determine a first filter coefficient of the first resampling module according to the remote unit information. The first resampling module 240 is configured to resample the corresponding first single-channel parallel IQ data stream according to the first filter coefficient to obtain a second single-channel parallel IQ data stream.
Specifically, in order to transmit the IQ data stream of the access unit to the corresponding remote unit, the first single-channel parallel IQ data stream passing through the first switching module 230 needs to be resampled. First, the downlink IQ data adaptation processing module 210 may search the corresponding first filter coefficients from the first filter coefficient memory 310 according to the sampling rate and the bandwidth in the remote unit information. Next, the first resampling module 240 resamples the first single-channel parallel IQ data stream passing through the first switching module 230 according to the found first filter coefficient, thereby obtaining a second single-channel parallel IQ data stream to be sent to the remote unit RU.
For example, referring to fig. 3b, the IQ data adaptation apparatus of the downlink includes M first Deframer modules 220, 1 first Switch selection module 230 (Switch), t×n first resampling modules 240 (Resampler), N first frame modules 250 (frames), 1 downlink IQ data adaptation processing module 210, and 1 first filter coefficient memory 310.
The first de-framing module 220 receives the first multi-channel serial IQ data stream through the access unit AU, and decomposes the first multi-channel serial IQ data stream into a first single-channel parallel IQ data stream. According to the channel information in the access unit information and the channel information in the remote unit information, the downlink IQ data adaptation processing module 210 controls the first switch selection module 230 to connect the corresponding channels and establish a corresponding data communication link to obtain a corresponding first single-channel parallel IQ data stream, i.e. selects the first single-channel parallel IQ data stream to be sent to the remote unit RU. The corresponding first single channel parallel IQ data stream is sent to the corresponding first resampling module 240. Based on the sampling rate and the frequency band in the remote unit information, the downlink IQ data adaptation processing module 210 may determine a first filter coefficient of the first resampling module and send the first filter coefficient to the first resampling module 240. The first resampling module 240 resamples the corresponding first single-channel parallel IQ data stream to obtain a second single-channel parallel IQ data stream according to the first filter coefficients, and sends the second single-channel parallel IQ data stream to the first framing module 250. According to the channel information in the remote unit information, the first framing module 250 combines the resampled second single-channel parallel IQ data stream to obtain a second multi-channel serial IQ data stream, and sends the second multi-channel serial IQ data stream to the corresponding remote unit RU. It can be understood that the downlink IQ data adaptation processing module 210 is connected to the first frame decoding module 220, the first switch selection module 230, the first resampling module 240, the first framing module 250 and the first filter coefficient memory 310, so as to control the downlink IQ data adaptation processing module to work to complete the whole downlink IQ data adaptation process.
The downlink IQ data adaptation apparatus includes a downlink IQ data adaptation processing module, a first frame decoding module, a first switch selection module, a first resampling module, a first framing module and a first filter coefficient memory, and may be applied to an extension unit EU. By introducing a first resampling module and storing the first filter coefficients required by the resampling module. In the downlink, IQ data flows of different channels, different frequency bands, different bandwidths and different sampling rates can be acquired from different access units AU, and IQ data of a specific channel, a specific frequency band, a specific bandwidth and a specific sampling rate are sent to a remote unit RU after IQ data adaptation and resampling processing. And the automatic adaptation of IQ data flow between the access unit AU equipment and the remote unit RU equipment with different channels, different frequency bands, different sampling rates and different bandwidths is realized.
In one embodiment, please continue to refer to fig. 2b and fig. 3b, when the distributed antenna system includes m access units and n remote units, the number of the first deframed modules is m, and the number of the first group of frame modules is n; if the downlink IQ data transmitted to each remote unit are different from each other and the downlink IQ data has t channels, the number of the first resampling modules is n×t.
In one embodiment, please continue to refer to fig. 2b and fig. 3b, when the distributed antenna system includes m access units and n remote units, the number of first deframes is m, and the number of first groups of frame modules is n. If the downlink IQ data transmitted to each remote unit is the same and the downlink IQ data has t channels, the number of the first resampling modules is t. Specifically, the RU downlink IQ data to be sent to each remote unit is identical, and RU downlink IQ data to be sent to each remote unit is grouped intoEach IQ data path sent to the remote unit RU is +>Is a subset of the set of (c). Since the first resampling module is provided with the corresponding sampling rate and frequency band, if the downlink IQ data sent to each remote unit RU is identical. Then, referring to fig. 4, the first resampling module may send the resampled second single-channel parallel IQ data stream to each of the first framing modules. Under the condition, the number of the first resampling modules is greatly reduced, so that the implementation difficulty of the downlink IQ data adapting device is reduced, the required resources are greatly reduced, and the cost is saved.
In one embodiment, referring to fig. 5a, an uplink IQ data adaptation apparatus for a distributed antenna system is provided, which includes an uplink IQ data adaptation processing module 510, a second de-framing module 520, a second resampling module 530, a second switch selection module 540 and a second framing module 550.
Specifically, the uplink IQ data adaptation processing module 510 is configured to read access unit information from an access unit and remote unit information from a remote unit. And the second de-framing module 520 is connected to the output end of the uplink IQ data adaptation processing module 510, and is configured to de-frame the third multi-channel serial IQ data stream obtained by the remote unit according to the remote unit information, so as to obtain a third single-channel parallel IQ data stream. And the second resampling module 530 is connected to the output end of the second frame de-forming module 520, and is configured to receive the obtained third single-channel parallel IQ data stream, and resample the obtained third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream. And a second switch selection module 540 connected to the output end of the second resampling module 530, configured to establish a corresponding data communication link according to the access unit information and the remote unit information, so as to obtain a corresponding fourth single-channel parallel IQ data stream. And the second framing module 550 is connected to the output end of the second switch selection module 540, and is configured to frame the corresponding fourth single-channel parallel IQ data stream according to the access unit information, so as to obtain a fourth multi-channel serial IQ data stream.
For example, referring to fig. 5b, the IQ data adaptation apparatus of the uplink includes n second Deframer modules 520 (frames), 1 second Switch selection module 540 (switches), t×n second resampling modules 530 (resamplers), m second frame modules 550 (frames), and 1 uplink IQ data adaptation processing module 510 (IQ Adaption Processor). The upstream IQ data sent by the remote unit RU has t channels. Specifically, the second de-framing module 520 receives the third multi-channel serial IQ data stream through the remote unit RU, decomposes the third multi-channel serial IQ data stream into a third single-channel parallel IQ data stream, and sends the third single-channel parallel IQ data stream to the second resampling module 530. The second resampling module 530 resamples the third single-channel parallel IQ data stream according to the sampling rate and the frequency band in the access unit information, and sends the fourth single-channel parallel IQ data stream to the second switch selection module 540. According to the channel information in the access unit information and the channel information in the remote unit information, the uplink IQ data adaptation processing module 510 controls the second switch selection module 540 to connect the corresponding channels and establish a corresponding data communication link to obtain a corresponding fourth single-channel parallel IQ data stream, i.e. selects the fourth single-channel parallel IQ data stream to be sent to the access unit AU. The fourth single-channel parallel IQ data stream, which needs to be sent to the access unit AU, is sent to the second set of frame modules 550 via the second switch selection module 540. According to the channel information in the remote unit information, the second framing module 550 combines the fourth single-channel parallel IQ data streams to be sent to the access unit AU to obtain a fourth multi-channel serial IQ data stream, and sends the fourth multi-channel serial IQ data stream to the corresponding access unit AU. It can be appreciated that the uplink IQ data adaptation processing module 510 is connected to the second deframer module 520, the second switch selection module 540, the second resampling module 530 and the second framing module 550 to control the operation thereof so as to complete the whole process of uplink IQ data adaptation.
With continued reference to figure 5b,represented as an upstream IQ data stream sent by all remote units RU to the extension unit EU, wherein +.>A third multi-channel serial IQ data stream for transmission to the extension unit EU for the 1 st remote unit RU +.>A third multi-channel serial IQ data stream is sent for the nth remote unit RU to the extension unit EU. />And decomposing by a corresponding second frame-removing module Deframer_u1 to obtain a plurality of third single-channel parallel IQ data streams, namely O11_u, O12_u, … and O1t_u respectively. />And decomposing by a corresponding second frame-removing module Deframer_un to obtain a plurality of third single-channel parallel IQ data streams, namely On1_u, on2_u, … and Ont _u respectively.
With continued reference to fig. 5b, the third single-channel parallel IQ data streams required to be sent to the 1 st access unit AU are o11_u, o12_u, …, o1t_u, and the third single-channel parallel IQ data streams required to be sent to the mth access unit RU are on1_u, on2_u, …, ont _u. Since the sampling rate and the frequency band of the IQ data of the access unit AU are different from those of the IQ data of the remote unit, a second resampler_u is correspondingly arranged in each path of third single-channel parallel IQ data stream to obtain the IQ data needed by the access unit AU. And a plurality of third single-channel parallel IQ data streams are O11_u, O12_u, … and O1t_u, and are respectively sent to a corresponding second resampler_u for resampling processing to obtain fourth single-channel parallel IQ data streams W11_u, W12_u, … and W1t_u. For example, the third single-channel parallel IQ data stream o11_u is sent to a second resampling module resampler_u11 for resampling processing, so as to obtain a second single-channel parallel IQ data stream w11_u. And the third single-channel parallel IQ data streams are On1_u, on2_u, … and Ont _u, which are respectively sent to a corresponding second resampler_u for resampling processing to obtain fourth single-channel parallel IQ data streams Wn1_u, wn2_u, … and Wnt_u. For example, the third single-channel parallel IQ data stream on1_u is sent to a second resampling module resampler_un1 for resampling, so as to obtain a fourth single-channel parallel IQ data stream wn1_u.
With continued reference to figure 5b,represented as an IQ data stream obtained by resampling the uplink IQ data stream sent by all the remote units RU. />Represented as an IQ data stream obtained by resampling an IQ data stream transmitted by the 1 st remote unit RU,represented as an IQ data stream obtained by resampling an IQ data stream sent by the nth remote unit RU. The uplink IQ data adaptation processing module 510 controls the second switch selection module 540 to connect the corresponding channels and establish the corresponding data communication link to select the fourth single-channel parallel IQ data stream to be sent to the access unit AU. The selected fourth single-channel parallel IQ data stream is sent to the second framing module 550 via the second switch selection module 540. The fourth single-channel parallel IQ data stream sent to the second framing module framer_u1 is denoted as: s11_u, s12_u, …, s1k_u, a fourth single-channel parallel IQ data stream sent to the second framing module framer_um, denoted as: sm1_u, sm2_u, …, smk_u.
With continued reference to FIG. 5b, the fourth single-channel parallel IQ data streams S11_u, S12_u, …, S1k_u are combined by the second framing module framer_u1The fourth single-channel parallel IQ data stream sm1_u, sm2_u, …, smk_u is combined by the second set of frame modules framer_um to obtain sm1_u, sm2_u, …, smk_u. Wherein (1) >A fourth multi-channel serial IQ data stream, denoted extension unit EU, sent to the 1 st access unit AU,/v>A fourth multi-channel serial IQ data stream, denoted extension unit EU, sent to the mth access unit AU. />Represented as an uplink IQ-data stream sent by the extension unit EU to all access units AU.
The uplink IQ data adaptation apparatus includes an uplink IQ data adaptation processing module, a second frame decoding module, a second switch selection module, a second resampling module and a second frame group module, and the uplink IQ data adaptation apparatus may be applied in the extension unit EU. By introducing the second resampling module, in the uplink, IQ data flows with different channels, different frequency bands, different bandwidths and different sampling rates can be obtained from different remote units RU, and after IQ data adaptation and resampling processing, IQ data with specific channels, specific frequency bands, specific bandwidths and specific sampling rates are sent to the access unit AU. And the automatic adaptation of IQ data flow between the access unit AU equipment and the remote unit RU equipment with different channels, different frequency bands, different sampling rates and different bandwidths is realized, and the deployment flexibility of the digital DAS is improved.
In one embodiment, referring to fig. 6a, the uplink IQ data adaptation apparatus further comprises: a second filter coefficient memory 610 for storing second filter coefficients required by the second resampling module. The IQ data adaptation processing module 510 is configured to determine a second filter coefficient of the second resampling module according to the access unit information. And a second resampling module 540, configured to resample the obtained third single-channel parallel IQ data stream according to the second filter coefficient to obtain a fourth single-channel parallel IQ data stream.
In particular, in order to send the IQ data stream of the remote unit RU to the corresponding access unit AU, the third single-channel parallel IQ data stream passing through the second deframer module 520 needs to be resampled. First, the uplink IQ data adaptation processing module 510 may search the corresponding second filter coefficients from the second filter coefficient memory 610 according to the sampling rate and the bandwidth in the access unit information. Next, the second resampling module 540 resamples the third single-channel parallel IQ data stream passing through the second deframer module 520 according to the found second filter coefficient, thereby obtaining a fourth single-channel parallel IQ data stream to be sent to the access unit AU.
For example, referring to fig. 6b, the IQ data adaptation apparatus of the uplink includes n second Deframer modules 520 (frames), 1 second Switch selection module 540 (switches), t×n second resampling modules 530 (resamplers), m second frame modules 550 (frames), 1 uplink IQ data adaptation processing module 510 (IQ Adaption Processor), and 1 second filter coefficient memory 610. The upstream IQ data sent by the remote unit RU has t channels.
The second de-framing module 520 receives the third multi-channel serial IQ data stream through the remote unit, decomposes the third multi-channel serial IQ data stream into a third single-channel parallel IQ data stream, and sends the third single-channel parallel IQ data stream to the second resampling module 530. Based on the sampling rate and the frequency band in the remote unit information, the uplink IQ data adaptation processing module 510 may determine the second filter coefficients of the second resampling module 530 and send them to the second resampling module 530. The second resampling module 530 resamples the third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream according to the second filter coefficients, and sends the fourth single-channel parallel IQ data stream to the second switch selection module 540. According to the channel information in the access unit information and the channel information in the remote unit information, the uplink IQ data adaptation processing module 510 controls the second switch selection module 540 to connect the corresponding channels and establish a corresponding data communication link to obtain a corresponding fourth single-channel parallel IQ data stream, i.e. selects the fourth single-channel parallel IQ data stream to be sent to the access unit AU. The fourth single-channel parallel IQ data stream, which needs to be sent to the access unit AU, is sent to the second set of frame modules 550 via the second switch selection module 540. According to the channel information in the remote unit information, the second framing module 550 combines the fourth single-channel parallel IQ data streams to be sent to the access unit AU to obtain a fourth multi-channel serial IQ data stream, and sends the fourth multi-channel serial IQ data stream to the corresponding access unit AU. It can be understood that the uplink IQ data adaptation processing module 510 is connected to the second frame decoding module 520, the second switch selection module 540, the second resampling module 530, the second framing module 550 and the second filter coefficient memory 610 to control the operation thereof so as to complete the whole uplink IQ data adaptation process.
In one embodiment, please continue to refer to fig. 5b and fig. 6b, when the distributed antenna system includes m access units AU and n remote units AU, the number of second frame de-encoding modules is n, and the number of second group of frame modules is m; if the uplink IQ data sent by each remote unit are different from each other, and the uplink IQ data has t channels, the number of the second resampling modules is n×t.
In one embodiment, please continue to refer to fig. 5b and fig. 6b, when the distributed antenna system includes m access units AUs and n remote units RU, the number of second deframes is n, and the number of second groups of frame modules is m; if the uplink IQ data sent by each remote unit is the same, and the uplink IQ data has t channels, the number of the second resampling modules is t.
Further, referring to fig. 7a, the IQ data adaptation apparatus for an uplink further includes an adder module 710, where the adder module 710 is configured to add up the third single-channel parallel IQ data streams with the same frequency band and the same sampling rate before resampling, to obtain a fifth single-channel parallel IQ data stream, and send the fifth single-channel parallel IQ data stream to the second resampling module 530. The second resampling module 530 is configured to receive the accumulated fifth single-channel parallel IQ data stream, and resample the accumulated fifth single-channel parallel IQ data stream.
Specifically, the uplink IQ data sent by each remote unit RU to the extension unit EU has the same frequency band and the same sampling rate, and the uplink IQ data with the same frequency band and the same sampling rate is sent to the same access unit AU. The uplink IQ data sent by the remote unit RU is grouped intoThe IQ data transmitted by each remote unit RU is +.>Is a subset of the set of (c). Therefore, pleaseReferring to fig. 7b, before entering the second resampling module 530, the IQ data with the same frequency band and the same sampling rate is accumulated by the adder module 710, and then sent to the second resampling module 530 for resampling. Since the second resampling module is provided with the corresponding sampling rate and frequency band, if the uplink IQ data to be transmitted by each remote unit RU is the same. Then the second resampling module may send the resampled fourth single-channel parallel IQ data stream to the second switch selection module 540. Under the condition, the number of the second resampling modules is greatly reduced, so that the implementation difficulty of the uplink IQ data adapting device is reduced, the required resources are greatly reduced, and the cost is saved. It should be noted that, in the second switch selection module 540, there is uplink IQ data that is not adapted to the required frequency band and sampling rate, for example, when the number of channels of the remote unit is smaller than the number of channels of the access unit, the value 0 may be assigned to the corresponding uplink channel.
In one embodiment, there is provided herein a distributed antenna system comprising: the system comprises an access unit, an extension unit in communication connection with the access unit and a remote unit in communication connection with the extension unit; the extension unit includes a downlink IQ data adaptation apparatus as in any of the above embodiments and an uplink IQ data adaptation apparatus as in any of the above embodiments.
In one embodiment, the first filter coefficient memory and the second filter coefficient memory are integrated in one filter coefficient memory. The downlink IQ data adaptation processing module and the uplink IQ data adaptation processing module are integrated in one IQ data adaptation processing module.
In an embodiment, please refer to fig. 8, a downlink IQ data adaptation method for a distributed antenna system is provided in the present application, which can be applied to the downlink IQ data adaptation apparatus of any one of the above embodiments, and the method includes the following steps:
s810, reading access unit information from the access unit and remote unit information from the remote unit.
S820, according to the information of the access unit, the first multichannel serial IQ data stream obtained by the access unit is de-framed to obtain a first single-channel parallel IQ data stream.
S830, establishing a corresponding data communication link according to the access unit information and the remote unit information to obtain a corresponding first single-channel parallel IQ data stream.
S840, resampling the corresponding first single-channel parallel IQ data stream to obtain a second single-channel parallel IQ data stream.
S850, framing the resampled second single-channel parallel IQ data stream according to the remote unit information to obtain a second multi-channel serial IQ data stream.
According to the downlink IQ data adaptation method, a data resampling mechanism is introduced, and conversion can be conveniently carried out between different sampling rates, so that the deployment flexibility of the digital DAS is expanded.
In one embodiment, referring to fig. 9, before resampling the corresponding first single-channel parallel IQ data stream, the method further comprises:
s910, determining a first filter coefficient of the first resampling module according to the remote unit information.
Resampling the obtained first single-channel parallel IQ data stream comprises:
s920, resampling the corresponding first single-channel parallel IQ data stream according to the first filter coefficient to obtain a second single-channel parallel IQ data stream.
It should be noted that, for the specific limitation of the downlink IQ data adaptation method, reference may be made to the limitation of the downlink IQ data adaptation apparatus, which is not repeated herein.
In an embodiment, please refer to fig. 10, the present application provides an uplink IQ data adaptation method for a distributed antenna system, which can be applied to the uplink IQ data adaptation apparatus of any one of the above embodiments, and the method includes the following steps:
s1010, reading access unit information from the access unit and remote unit information from the remote unit.
S1020, according to the remote unit information, the third multi-channel serial IQ data stream obtained by the remote unit is de-framed to obtain a third single-channel parallel IQ data stream.
S1030, resampling the obtained third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream.
S1040, according to the access unit information and the remote unit information, establishing a corresponding data communication link to obtain a corresponding fourth single-channel parallel IQ data stream.
S1050, framing the corresponding fourth single-channel parallel IQ data stream according to the access unit information to obtain a fourth multi-channel serial IQ data stream.
According to the uplink IQ data adaptation method, a data resampling mechanism is introduced, and conversion can be conveniently carried out between different sampling rates, so that the deployment flexibility of the digital DAS is expanded.
In one embodiment, referring to fig. 11, before resampling the resulting third single-channel parallel IQ data stream, the method further comprises:
s1110, determining a second filter coefficient of a second resampling module according to the access unit information.
Resampling the obtained third single-channel parallel IQ data stream comprises:
s1120, resampling the obtained third single-channel parallel IQ data stream according to the second filter coefficient to obtain a fourth single-channel parallel IQ data stream.
It should be noted that, for the specific limitation of the above-mentioned uplink IQ data adaptation method, reference may be made to the limitation of the uplink IQ data adaptation apparatus, which is not repeated here.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (15)
1. A downlink IQ data adaptation apparatus for a distributed antenna system, wherein the apparatus is applied in an extension unit EU, the apparatus comprising:
the downlink IQ data adaptation processing module is used for reading access unit information from the access unit and reading remote unit information from the remote unit;
the first de-framing module is used for de-framing the first multichannel serial IQ data stream obtained through the access unit according to the access unit information to obtain a first single-channel parallel IQ data stream;
the first switch selection module is used for connecting corresponding channels according to the channel information in the access unit information and the channel information in the remote unit information and establishing a corresponding data communication link to obtain a corresponding first single-channel parallel IQ data stream;
the first resampling module is used for receiving the corresponding first single-channel parallel IQ data stream, and resampling the corresponding first single-channel parallel IQ data stream according to the sampling rate and the frequency band in the remote unit information to obtain a second single-channel parallel IQ data stream;
and the first framing module is used for framing the resampled second single-channel parallel IQ data stream according to the channel information in the remote unit information to obtain a second multi-channel serial IQ data stream.
2. The apparatus of claim 1, wherein the apparatus further comprises:
the first filter coefficient memory is used for storing first filter coefficients required by the first resampling module;
the downlink IQ data adaptation processing module is further configured to determine a first filter coefficient of the first resampling module according to the remote unit information;
the first resampling module is configured to resample the corresponding first single-channel parallel IQ data stream according to the first filter coefficient to obtain a second single-channel parallel IQ data stream.
3. The apparatus of claim 1, wherein when the distributed antenna system comprises m access units and n remote units, the number of first deframes is m and the number of first groups of framing modules is n;
if the downlink IQ data transmitted to each remote unit are different from each other, and the downlink IQ data have t channels, the number of the first resampling modules is n×t.
4. The apparatus of claim 1, wherein when the distributed antenna system comprises m access units and n remote units, the number of first deframes is m and the number of first groups of framing modules is n;
If the downlink IQ data transmitted to each remote unit is the same, and the downlink IQ data has t channels, the number of the first resampling modules is t.
5. An uplink IQ data adaptation apparatus for a distributed antenna system, wherein the apparatus is applied in an extension unit EU, the apparatus comprising:
the uplink IQ data adaptation processing module is used for reading access unit information from the access unit and reading remote unit information from the remote unit;
the second de-framing module is used for de-framing the third multichannel serial IQ data stream obtained by the remote unit according to the remote unit information to obtain a third single-channel parallel IQ data stream;
the second resampling module is used for receiving the obtained third single-channel parallel IQ data stream, and resampling the obtained third single-channel parallel IQ data stream according to the sampling rate and the frequency band in the access unit information to obtain a fourth single-channel parallel IQ data stream;
the second switch selection module is used for connecting the corresponding channels and establishing a corresponding data communication link according to the channel information in the access unit information and the channel information in the remote unit information so as to obtain a corresponding fourth single-channel parallel IQ data stream;
And the second framing module is used for framing the corresponding fourth single-channel parallel IQ data stream according to the channel information in the access unit information so as to obtain a fourth multi-channel serial IQ data stream.
6. The apparatus of claim 5, wherein the apparatus further comprises:
the second filter coefficient memory is used for storing second filter coefficients required by the second resampling module;
the IQ data adaptation processing module is configured to determine a second filter coefficient of the second resampling module according to the access unit information;
and the second resampling module is used for resampling the obtained third single-channel parallel IQ data stream according to the second filter coefficient to obtain a fourth single-channel parallel IQ data stream.
7. The apparatus of claim 5, wherein when the distributed antenna system comprises m access units and n remote units, the number of second deframes is n and the number of second groups of framing modules is m;
if the uplink IQ data sent by each remote unit are different from each other, and the uplink IQ data have t channels, the number of the second resampling modules is n×t.
8. The apparatus of claim 5, wherein when the distributed antenna system comprises m access units and n remote units, the number of second deframes is n and the number of second groups of framing modules is m;
if the uplink IQ data sent by each remote unit is the same and the uplink IQ data has t channels, the number of the second resampling modules is t.
9. The apparatus of claim 8, further comprising an adder module configured to accumulate the third single-channel parallel IQ data streams with the same multipath frequency band and the same sampling rate to obtain a fifth single-channel parallel IQ data stream before the resampling, and send the fifth single-channel parallel IQ data stream to the second resampling module;
the second resampling module is configured to receive the accumulated fifth single-channel parallel IQ data stream, and resample the accumulated fifth single-channel parallel IQ data stream.
10. A distributed antenna system, comprising: an access unit, an extension unit in communication with the access unit, and a remote unit in communication with the extension unit; the extension unit comprises a downstream IQ data adaptation apparatus according to any one of claims 1 to 4 and an upstream IQ data adaptation apparatus according to any one of claims 5 to 9.
11. The system of claim 10, wherein a first filter coefficient memory in the downstream IQ data adaptation device is integrated with a second filter coefficient memory in the upstream IQ data adaptation device in one filter coefficient memory;
the downlink IQ data adaptation processing module in the downlink IQ data adaptation device and the uplink IQ data adaptation processing module of the uplink IQ data adaptation device are integrated in one IQ data adaptation processing module.
12. A downlink IQ data adaptation method for a distributed antenna system, wherein the method is applied to a downlink IQ data adaptation device in an extension unit EU, the method comprising:
reading access unit information from the access unit and remote unit information from the remote unit;
according to the access unit information, de-framing the first multichannel serial IQ data stream obtained by the access unit to obtain a first single-channel parallel IQ data stream;
according to the channel information in the access unit information and the channel information in the remote unit information, connecting the corresponding channels and establishing a corresponding data communication link to obtain a corresponding first single-channel parallel IQ data stream;
Resampling the corresponding first single-channel parallel IQ data stream according to the sampling rate and the frequency band in the remote unit information to obtain a second single-channel parallel IQ data stream;
and framing the resampled second single-channel parallel IQ data stream according to the channel information in the remote unit information to obtain a second multi-channel serial IQ data stream.
13. The method of claim 12, wherein prior to said resampling said corresponding first single-channel parallel IQ data stream, the method further comprises:
determining a first filter coefficient of a first resampling module according to the remote unit information;
the resampling the corresponding first single-channel parallel IQ data stream comprises:
and resampling the corresponding first single-channel parallel IQ data stream according to the first filter coefficient to obtain a second single-channel parallel IQ data stream.
14. An uplink IQ data adaptation method for a distributed antenna system, wherein the method is applied to an uplink IQ data adaptation device in an extension unit EU, the method comprising:
reading access unit information from the access unit and remote unit information from the remote unit;
According to the remote unit information, de-framing a third multi-channel serial IQ data stream obtained by the remote unit to obtain a third single-channel parallel IQ data stream;
resampling the obtained third single-channel parallel IQ data stream according to the sampling rate and the frequency band in the access unit information to obtain a fourth single-channel parallel IQ data stream;
according to the channel information in the access unit information and the channel information in the remote unit information, connecting the corresponding channels and establishing a corresponding data communication link to obtain a corresponding fourth single-channel parallel IQ data stream;
and framing the corresponding fourth single-channel parallel IQ data stream according to the channel information in the access unit information to obtain a fourth multi-channel serial IQ data stream.
15. The method of claim 14, wherein prior to resampling the resulting third single-channel parallel IQ data stream, the method further comprises:
determining a second filter coefficient of a second resampling module according to the access unit information;
the resampling the obtained third single-channel parallel IQ data stream comprises:
And resampling the obtained third single-channel parallel IQ data stream according to the second filter coefficient to obtain a fourth single-channel parallel IQ data stream.
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