CN109412655A - Distributing antenna system, its I/Q data adaptive device and method - Google Patents
Distributing antenna system, its I/Q data adaptive device and method Download PDFInfo
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Abstract
This application involves a kind of distributing antenna system and its I/Q data adaptive device and methods, including downlink I/Q data adaptive device and uplink IQ adaptive device.Wherein, downlink I/Q data adaptive device includes downlink I/Q data adaptation processing module, the first solution frame module, first switch selecting module, the first resampling module and the first framing module；Uplink I/Q data adaptive device includes uplink I/Q data adaptation processing module, the second solution frame module, second switch selecting module, the second resampling module and the second framing module；And downlink I/Q data adaptive device and uplink I/Q data adaptive device can be applied in expanding element EU.By introducing resampling module, from different access unit AU obtain different channels, different frequency range, different bandwidth, different sample rate I/Q data, after I/Q data adaptation and resampling processing, the I/Q data of special modality, special frequency channel, specific bandwidth, particular sample rate is sent in far-end unit RU, thus the disposition flexibility of expanding digital DAS.
Description
Technical Field
The present application 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, more and more communication frequency bands, wider and wider bandwidths and more antennas are provided, and in order to better perform signal coverage, a digital Distributed Antenna System (DAS) is more and more widely applied.
The digital DAS system mainly includes three parts, which are an Access Unit (AU), an Extension Unit (EU), and a Remote Unit (RU). Firstly, acquiring a digitalized base station information source in an access unit in a data access or radio frequency coupling signal mode; then, the base station information source is transmitted to the expansion unit by using optical fibers or network cables, and the base station information source is transmitted to a plurality of remote units by using the optical fibers or the network cables in the expansion unit; finally, at the remote unit, the signal is reconverted to a radio frequency signal for cell coverage.
With the increasing types of the access units and the remote units, the sampling rate relationship of the IQ data becomes more and more complex, and the extension unit simply distributes the IQ data of the access unit to the remote units, which cannot meet the requirements of the development of the digital DAS technology.
Disclosure of Invention
Therefore, it is necessary to provide a distributed antenna system, and an IQ data adaptation apparatus and method thereof, for solving the technical problem that the extension 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 device for a distributed antenna system, where the device includes:
a downlink IQ data adaptation processing module for reading access unit information from the access unit and reading remote unit information from the remote unit;
a first de-framing module, configured to de-frame a first multi-channel serial IQ data stream obtained by 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;
a first resampling module, 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 is used for framing the second single-channel parallel IQ data stream obtained by resampling 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, where the apparatus includes:
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;
a second deframing module, configured to deframe a third multi-channel 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;
a second resampling module, 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;
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 another aspect, an embodiment of the present invention provides a distributed antenna system, including: 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 the downlink IQ data adaptation device described in any one of the embodiments above and the uplink IQ data adaptation device described in any one of the embodiments above.
In 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, a first multichannel serial IQ data stream obtained through an access unit is deframed 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;
framing the second single-channel parallel IQ data stream obtained by resampling 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;
de-framing a third multi-channel 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;
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 above technical solutions 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, IQ data adaptation can be performed on different types of access units and remote units, and therefore deployment flexibility of the digital DAS is improved.
Drawings
Fig. 1a to 1c are block diagrams of digitized distributed antenna systems;
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 in 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 of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 5b is a schematic structural diagram of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 6a is a block diagram of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 6b is a schematic structural diagram of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 7a is a block diagram of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 7b is a schematic structural diagram of an uplink IQ data adaptation apparatus according to an embodiment;
fig. 8 is a flowchart illustrating a downlink IQ data adaptation method according to an embodiment;
fig. 9 is a flowchart illustrating a downlink IQ data adaptation method according to an embodiment;
fig. 10 is a flowchart illustrating an uplink IQ data adaptation method according to an embodiment;
fig. 11 is a flowchart illustrating an uplink IQ data adaptation method according to an embodiment.
Detailed Description
As described in the background, with increasing variety of access unit and remote unit devices, users have increasingly demanding flexibility in the application of digital DAS. Referring to fig. 1a, the digital DAS system mainly includes three parts, which are an access unit AU, an expansion unit EU, and a remote unit RU.
Referring to fig. 1b, the access unit AU acquires the digitized IQ data stream by radio frequency coupling (RF) or digital access (digital), where S1 represents 1 st channel IQ data, S2 represents 2 nd channel IQ data, and Sk represents k th channel IQ data, and the IQ data of each channel corresponds to information such as an independent frequency band, a sampling rate, and a bandwidth. Definition ofAnd all IQ data sent to the extension unit EU by the access unit AU are distributed to the corresponding remote unit RU by the extension unit EU after the IQ data of the access unit AU are acquired.Denoted IQ data sent by the extension unit EU to the 1 st remote unit RU,denoted IQ data sent by the extension unit EU to the nth remote unit RU,denoted IQ data sent by the extension unit EU to all remote units RU. In general terms, the amount of the solvent to be used,is thatA subset of (1), i.e.Thus, the remote unit RU only needs to simply distribute the 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, for the uplink signal, the data flow is: RU → EU → AU → BS.
However, with the development of wireless communication technology, digital DAS is required not only for network coverage of a single operator and network coverage of multiple operators, but also for network coverage of SISO system and MIMO system, and further for network coverage of multi-band, multi-system signals. Therefore, the sampling rate relationship of the IQ data becomes 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 development of the digital DAS technology. In order to meet the requirement of the development of the digital DAS technology, the invention provides a distributed antenna system, an IQ data adaptation device and an IQ data adaptation method thereof, which can carry out IQ data adaptation between an access unit AU and a remote unit RU, so that an expansion unit EU can be compatible with different types of access units AU and remote units RU, and simultaneously, the access of new access unit AU equipment and new remote unit RU equipment can be conveniently supported.
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 transmits the adapted IQ data to the corresponding remote unit RU. Definition ofIQ data for all AUs to EU, definitionFor data sent from 1 st access unit AU to remote unit RU, definitionThe data sent to the remote unit RU for the mth access unit AU. Generally, in a common digital DAS topology,is no longerA subset of (1), 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 needs to introduce an IQ data Adapter (IQ Adapter) to perform data adaptation by the IQ data Adapter, so as to send the IQ data of the access unit AU to the remote unit RU.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, please refer 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 selecting 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 the access unit and read remote unit information from the 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 through the access unit according to the access unit information to obtain a first single-channel parallel IQ data stream. The first switch selecting module 230 connected to the output end of the first deframing module 220 is configured to establish 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. The first resampling module 240 connected to the output end of the first switch selecting 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 a first framing module 250 connected to the output end of the first resampling module 240, 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.
Exemplarily, referring to fig. 2b, the apparatus for adapting IQ data in downlink comprises m first deframing modules 220(Deframer), 1 first Switch selecting module 230(Switch), t × n first resampling modules 240 (sampler), n first framing modules 250(Framer), and 1 downlink IQ data adaptation processing module 210. Wherein, the downlink IQ data provided to the remote unit RU has t channels. Specifically, 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 the corresponding data communication link to obtain the corresponding first single-channel parallel IQ data stream, i.e., selects the first single-channel parallel IQ data stream that needs 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. According to the sampling rate and frequency band in the remote unit information, 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, 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 group frame module 250 merges the resampled second single-channel parallel IQ data streams to obtain second multi-channel serial IQ data streams, and sends the second multi-channel serial IQ data streams to the corresponding remote units RU. It is understood that the downlink IQ data adaptation processing module 210 is connected to the first de-framing module 220, the first switch selecting module 230, the first re-sampling module 240 and the first group of frames module 250 to control the operations thereof so as to complete the whole process of downlink IQ data adaptation.
With continued reference to figure 2b of the drawings,indicated as the downlink IQ data stream sent by all access units AU to the extension unit EU. Wherein,a first multi-channel serial IQ data stream denoted 1 st access unit AU to be sent to the extension unit EU,indicated as mth access unit AU to the first multi-channel serial IQ data stream of the extension unit EU.The first single-channel parallel IQ data streams are obtained through decomposition by a corresponding first de-framing module Deframer _ d1, and are S11_ d, S12_ d, …, and S1k _ d, respectively.And decomposing the data by a corresponding first de-framing module Deframer _ dm to obtain a plurality of paths of first single-channel parallel IQ data streams 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 the corresponding data communication link to select the first single-channel parallel IQ data stream to be sent to the remote unit RU.Denoted IQ data stream that needs to be transmitted to all remote units RU.To require an IQ data stream to be sent to the 1 st remote unit RU,is the IQ data stream that needs to be sent to the nth remote unit RU.
With reference to fig. 2b, the first single-channel parallel IQ data streams to be transmitted to the 1 st remote unit RU are W11_ d, W12_ d, … and W1t _ d, and the first single-channel parallel IQ data streams to be transmitted to the nth remote unit RU are Wn1_ d, Wn2_ d, … and Wnt _ d. Each path of first single-channel parallel IQ data stream is correspondingly provided withA first switch selection module, for example, the first single-channel parallel IQ data stream W11_ d is sent to the sampling _ d11 for resampling, so as to obtain a second single-channel parallel IQ data stream O11_ d. The resampled IQ data stream is expressed asWherein,denoted as the second single-channel parallel IQ data stream sent by the extension unit EU to the 1 st remote unit RU,denoted as the second single-channel parallel IQ data stream sent by the extension unit EU to the nth remote unit RU.
In fig. 2b, the AU Message is information read from the access unit AU by the extension unit EU, and includes information such as a channel, a frequency band, a sampling rate, and a bandwidth corresponding to an IQ data stream transmitted by the access unit AU. The RU Message is information read from the remote unit RU by the extension unit EU, and includes information such as a channel, a frequency band, a sampling rate, and a bandwidth of IQ data to be transmitted to the remote unit RU.
The downlink IQ data adaptation device comprises a downlink IQ data adaptation processing module, a first de-framing module, a first switch selection module, a first resampling module and a first group of frame modules, and can be applied to the EU of the extension unit. By introducing the first resampling module, in the downlink, IQ data streams of different channels, different frequency bands, different bandwidths, and different sampling rates can be acquired from different access units AU, and after IQ data adaptation and resampling processing, IQ data of a specific channel, a specific frequency band, a specific bandwidth, and a specific sampling rate is sent to the remote unit RU. And the automatic adaptation of IQ data streams between access unit AU equipment and remote unit RU equipment with different channels, different frequency bands, different sampling rates and different bandwidths is realized.
In one embodiment, please refer to fig. 3a, the downlink IQ data adaptation apparatus further comprises a first filter coefficient memory 310. The first filter coefficient memory 310 is used for storing 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. A first resampling module 240, 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 an access unit to a corresponding remote unit, the first single-channel parallel IQ data stream passing through the first switch module 230 needs to be resampled. First, the downlink IQ data adaptation processing module 210 may search the corresponding first filter coefficient from the first filter coefficient memory 310 according to the sampling rate and the bandwidth in the remote unit information. Secondly, 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, so as to obtain a second single-channel parallel IQ data stream that needs to be sent to the remote unit RU.
Exemplarily, referring to fig. 3b, the downlink IQ data adaptation apparatus includes M first deframing modules 220(Deframer), 1 first Switch selecting module 230(Switch), T × N first resampling modules 240 (sampler), N first framing modules 250(Framer), 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 de-frames 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 the corresponding data communication link to obtain the corresponding first single-channel parallel IQ data stream, i.e., selects the first single-channel parallel IQ data stream that needs 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 it to the first resampling module 240. According to the first filter coefficient, 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, 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 group frame module 250 merges the resampled second single-channel parallel IQ data streams to obtain second multi-channel serial IQ data streams, and sends the second multi-channel serial IQ data streams to the corresponding remote units RU. It is understood that the downlink IQ data adaptation processing module 210 is connected to the first de-framing module 220, the first switch selecting module 230, the first resampling module 240, the first framing module 250 and the first filter coefficient memory 310 to control the operations thereof so as to complete the whole process of downlink IQ data adaptation.
The downlink IQ data adaptation device comprises a downlink IQ data adaptation processing module, a first de-framing module, a first switch selection module, a first resampling module, a first group of frame modules and a first filter coefficient memory, and can be applied to the extended unit EU. By introducing a first resampling module and storing the first filter coefficients required by the resampling module. In the downlink, IQ data streams of different channels, different frequency bands, different bandwidths, and different sampling rates may be acquired from different access units AU, and after IQ data adaptation and resampling processing, IQ data of a specific channel, a specific frequency band, a specific bandwidth, and a specific sampling rate is transmitted to the remote unit RU. And the automatic adaptation of IQ data streams between access unit AU equipment and 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 deframing modules is m, and the number of the first group 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.
In one embodiment, with continued reference to fig. 2b and fig. 3b, when the distributed antenna system includes m access units and n remote units, the number of the first deframing modules is m, and the number of the first group 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. Specifically, the downlink IQ data required to be sent to each remote unit RU is the same, and the downlink IQ data required to be sent to each remote unit RU is collected intoThen each IQ data sent to the remote unit RU isA subset of (a). Since the first resampling module is provided with the corresponding sampling frequency and frequency band, the downlink IQ data sent to each remote unit RU is the same if necessary. Then, referring to fig. 4, the first resampling module may send the resampled second single-channel parallel IQ data stream to the respective first group of frame modules. Under the condition, the number of the first resampling modules is greatly reduced, so that the realization difficulty of the downlink IQ data adapting device is reduced, the required resources are greatly reduced, and the cost is saved.
In one embodiment, please refer 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 selecting 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 the access unit and read remote unit information from the remote unit. And a second de-framing module 520 connected to the output end of the uplink IQ data adaptation processing module 510, configured to de-frame the third multi-channel 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. And a second resampling module 530 connected to an output end of the second deframing module 520, 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 to obtain a corresponding fourth single-channel parallel IQ data stream. And a second framing module 550 connected to the output end of the second switch selecting module 540, configured to frame 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.
Exemplarily, referring to fig. 5b, the apparatus for IQ data adaptation for uplink includes n second deframing modules 520(Deframer), 1 second Switch selecting module 540(Switch), t × n second resampling modules 530 (sampler), m second framing modules 550(Framer), and 1 uplink IQ data adaptation processing module 510(IQ adaptation processor). The uplink IQ data transmitted by the remote unit RU has t channels. Specifically, the second deframing 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. According to the sampling rate and the frequency band in the access unit information, the second resampling module 530 resamples the third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream, and sends the fourth single-channel parallel IQ data stream to the second switch selecting 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 the corresponding data communication link to obtain the corresponding fourth single-channel parallel IQ data stream, i.e. select the fourth single-channel parallel IQ data stream that needs to be sent to the access unit AU. The fourth single-channel parallel IQ data stream that needs to be sent to the access unit AU is sent to the second group frame module 550 via the second switch selection module 540. According to the channel information in the remote unit information, the second group frame module 550 merges the fourth single-channel parallel IQ data stream that needs 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 is understood that the uplink IQ data adaptation processing module 510 is connected to the second de-framing module 520, the second switch selecting module 540, the second resampling module 530 and the second group of frames module 550 to control the operations thereof to complete the entire process of the uplink IQ data adaptation.
With continued reference to figure 5b of the drawings,denoted as the uplink IQ data stream sent by all remote units RU to the extension unit EU, wherein,a third multi-channel serial IQ data stream sent to the extension unit EU for the 1 st remote unit RU,a third multi-channel serial IQ data stream sent to the extension unit EU for the nth remote unit RU.The first single-channel parallel IQ data streams are decomposed by a corresponding second de-framing module Deframer _ u1 to obtain a plurality of third single-channel parallel IQ data streams, which are O11_ u, O12_ u, … and O1t _ u, respectively.And decomposing the data by a corresponding second de-framing module Deframer _ un to obtain a plurality of third single-channel parallel IQ data streams, namely On1_ u, On2_ u, … and Ont _ u.
With reference to fig. 5b, the third single-channel parallel IQ data streams to be transmitted to the 1 st access unit AU are O11_ u, O12_ u, … and O1t _ u, and the third single-channel parallel IQ data streams to be transmitted to the m-th access unit RU are On1_ u, On2_ u, … and Ont _ u. Because the sampling rate and frequency band of the IQ data of the access unit AU are different from those of the IQ data of the remote unit, each path of third single-channel parallel IQ data stream is correspondingly provided with a second resampling module, sample _ u, to obtain the IQ data required by the access unit AU. The multiple paths of third single-channel parallel IQ data streams are O11_ u, O12_ u, … and O1t _ u, and are respectively sent to corresponding second resampling modules, and resampling processing is performed on the second single-channel parallel IQ data streams 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 the second resampling module Resampler _ u11 for resampling, and the second single-channel parallel IQ data stream W11_ u is obtained. The multiple paths of third single-channel parallel IQ data streams are On1_ u, On2_ u, … and Ont _ u, which are respectively sent to corresponding second resampling modules to perform resampling processing, so as 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 the second resampling module Resampler _ un1 for resampling, and a fourth single-channel parallel IQ data stream Wn1_ u is obtained.
With continued reference to figure 5b of the drawings,it is denoted as IQ data stream obtained by resampling the uplink IQ data streams sent by all the remote units RU.Denoted as IQ data stream after resampling processing the IQ data stream transmitted by the 1 st remote unit RU,denoted as the IQ data stream after resampling the IQ data stream transmitted 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 a fourth single-channel parallel IQ data stream that needs to be sent to the access unit AU. Selected ofThe fourth single-channel parallel IQ data stream is sent to the second group frame module 550 via the second switch selection module 540. The fourth single-channel parallel IQ data stream sent to the second group frame module Framer _ u1 is denoted as: s11_ u, S12_ u, …, S1k _ u, and the fourth single-channel parallel IQ data stream sent to the second group frame module Framer _ um is recorded as: sm1_ u, Sm2_ u, …, Smk _ u.
Referring to fig. 5b, the fourth single-channel parallel IQ data streams S11_ u, S12_ u, …, and S1k _ u are combined by the second framing module Framer _ u1The fourth single-channel parallel IQ data streams Sm1_ u, Sm2_ u, …, Smk _ u are combined by the second framing module Framer _ um to obtain Sm1_ u, Sm2_ u, …, Smk _ u. Wherein,a fourth multi-channel serial IQ data stream indicated as extension unit EU sent to the 1 st access unit AU,a fourth multi-channel serial IQ data stream, denoted extension unit EU, sent to the mth access unit AU.Denoted as the uplink IQ data stream sent by the extension unit EU to all access units AU.
The above-mentioned uplink IQ data adaptation apparatus includes an uplink IQ data adaptation processing module, a second deframing module, a second switch selection module, a second resampling module, and a second group of frame modules, and may be applied to the extension unit EU. By introducing the second resampling module, in the uplink, IQ data streams of 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 of a specific channel, a specific frequency band, a specific bandwidth, and a specific sampling rate is sent to the access unit AU. And the automatic adaptation of IQ data streams between access unit AU equipment and remote unit RU equipment of different channels, different frequency bands, different sampling rates and different bandwidths is realized, and the deployment flexibility of the digital DAS is improved.
In an embodiment, referring to fig. 6a, the apparatus for adapting uplink IQ data further includes: and a second filter coefficient memory 610 for storing a second filter coefficient required by the second resampling module. An IQ data adaptation processing module 510, configured to determine a second filter coefficient of the second resampling module according to the access unit information. 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 de-framing module 520 needs to be resampled. First, the IQ data adaptation processing module 510 may search the corresponding second filter coefficient from the second filter coefficient memory 610 according to the sampling rate and the bandwidth in the access unit information. Secondly, the second resampling module 540 resamples the third single-channel parallel IQ data stream passing through the second deframing module 520 according to the found second filter coefficient, thereby obtaining a fourth single-channel parallel IQ data stream that needs to be sent to the access unit AU.
Exemplarily, referring to fig. 6b, the apparatus for adapting IQ data for uplink includes n second deframing modules 520(Deframer), 1 second Switch selecting module 540(Switch), t × n second resampling modules 530 (sampler), m second framing modules 550(Framer), 1 uplink IQ data adaptation processing module 510(IQ addition Processor), and 1 second filter coefficient memory 610. The uplink IQ data transmitted by the remote unit RU has t channels.
The second deframing 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 frequency band in the remote unit information, the 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. According to the second filter coefficient, the second resampling module 530 resamples the third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream, and sends the fourth single-channel parallel IQ data stream to the second switch selecting 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 the corresponding data communication link to obtain the corresponding fourth single-channel parallel IQ data stream, i.e. select the fourth single-channel parallel IQ data stream that needs to be sent to the access unit AU. The fourth single-channel parallel IQ data stream that needs to be sent to the access unit AU is sent to the second group frame module 550 via the second switch selection module 540. According to the channel information in the remote unit information, the second group frame module 550 merges the fourth single-channel parallel IQ data stream that needs 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 is understood that the uplink IQ data adaptation processing module 510 is connected to the second de-framing module 520, the second switch selecting module 540, the second resampling module 530, the second framing module 550 and the second filter coefficient memory 610 to control the operations thereof to complete the entire process of the uplink IQ data adaptation.
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 the second deframing modules is n, and the number of the 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 have t channels, the number of the second resampling modules is n x t.
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 RU, the number of the second deframing modules is n, and the number of the second group 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 apparatus for adapting IQ data for uplink further includes an adder module 710, where the adder module 710 is configured to accumulate multiple paths of the third single-channel parallel IQ data streams with the same frequency band and the same sampling rate to obtain a fifth single-channel parallel IQ data stream before resampling, and send the fifth single-channel parallel IQ data stream to the second resampling module 530. A second resampling module 530, 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 having the same frequency band and the same sampling rate are sent to the same access unit AU. The uplink IQ data transmitted by the remote unit RU are collected intoThen the IQ data transmitted by each remote unit RU isA subset of (a). Therefore, referring to fig. 7b, before entering the second resampling module 530, the IQ data of the same frequency band and the same sampling rate are 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 frequency and frequency band, if the uplink IQ data that each remote unit RU needs to transmit is the same. Then, the second resampling module may send the resampled fourth single-channel parallel IQ data stream to the second switch selecting module 540. Under the condition, the number of the second resampling modules is greatly reduced, 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 exists 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 less than the number of channels of the access unit, the uplink IQ data may be adapted to the required frequency band and sampling rateAnd assigning a value of 0 to the corresponding uplink channel.
In one embodiment, a distributed antenna system is provided herein, comprising: the system comprises an access unit, an extension unit and a remote unit, wherein the extension unit is in communication connection with the access unit; the extension unit comprises a downlink IQ data adaptation device as in any one of the above embodiments and an uplink IQ data adaptation device as in any one 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 an IQ data adaptation processing module.
In an embodiment, please refer to fig. 8, the present application provides a downlink IQ data adaptation method for a distributed antenna system, which can be applied to the downlink IQ data adaptation apparatus of any of the above embodiments, and the method includes the following steps:
s810, reading access unit information from the access unit and reading remote unit information from the remote unit.
S820, according to the access unit information, the first multi-channel serial IQ data stream obtained through the access unit is deframed to obtain a first single-channel parallel IQ data stream.
S830, according to the access unit information and the remote unit information, a corresponding data communication link is established 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.
And S850, framing the second single-channel parallel IQ data stream obtained by resampling according to the information of the remote unit to obtain a second multi-channel serial IQ data stream.
The downlink IQ data adaptation method introduces a data resampling mechanism, and can conveniently convert between different sampling rates, thereby expanding the deployment flexibility of the digital DAS.
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, comprising:
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 above limitation of the downlink IQ data adaptation apparatus, and details are not described herein again.
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 of the above embodiments, and the method includes the following steps:
s1010, reading access unit information from the access unit and reading remote unit information from the remote unit.
S1020, according to the information of the remote unit, deframing the third multi-channel serial IQ data stream obtained by the remote unit to obtain a third single-channel parallel IQ data stream.
And S1030, resampling the obtained third single-channel parallel IQ data stream to obtain a fourth single-channel parallel IQ data stream.
And S1040, 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 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.
The uplink IQ data adaptation method introduces a data resampling mechanism, and can conveniently convert between different sampling rates, thereby expanding the deployment flexibility of the digital DAS.
In one embodiment, referring to fig. 11, before resampling the resulting third single-channel parallel IQ data stream, the method further comprises:
and S1110, determining a second filter coefficient of the second resampling module according to the access unit information.
Resampling the obtained third single-channel parallel IQ data stream, comprising:
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 uplink IQ data adaptation method, reference may be made to the above limitation of the uplink IQ data adaptation apparatus, and details are not described herein again.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (15)
1. A downlink IQ data adaptation apparatus for a distributed antenna system, comprising:
a downlink IQ data adaptation processing module for reading access unit information from the access unit and reading remote unit information from the remote unit;
a first de-framing module, configured to de-frame a first multi-channel serial IQ data stream obtained by 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;
a first resampling module, 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 is used for framing the second single-channel parallel IQ data stream obtained by resampling according to the remote unit information to obtain a second multi-channel serial IQ data stream.
2. The apparatus of claim 1, further comprising:
the first filter coefficient memory is used for storing a first filter coefficient 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 the first deframing modules is m, and the number of the first group 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 the first deframing modules is m, and the number of the first group 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, 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;
a second deframing module, configured to deframe a third multi-channel 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;
a second resampling module, 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;
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.
6. The apparatus of claim 5, further comprising:
the second filter coefficient memory is used for storing a second filter coefficient required by the second resampling module;
the IQ data adaptation processing module is used for determining a second filter coefficient of the second resampling module according to the access unit information;
the second resampling module is 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.
7. The apparatus of claim 5, wherein when the distributed antenna system includes m access units and n remote units, the number of the second deframing modules is n, and the number of the second group 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 x t.
8. The apparatus of claim 5, wherein when the distributed antenna system comprises m access units and n remote units, the number of the second deframing modules is n, and the number of the second group of framing modules is m;
if the uplink IQ data sent by each remote unit are the same and the uplink IQ data have t channels, the number of the second resampling modules is t.
9. The apparatus of claim 8, further comprising an adder module, wherein the adder module is configured to accumulate multiple paths of third single-channel parallel IQ data streams with the same 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;
and 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 connection with the access unit, and a remote unit in communication connection with the extension unit; the extension unit comprises a downstream IQ data adaptation device according to any one of claims 1 to 4 and an upstream IQ data adaptation device according to any one of claims 5 to 9.
11. The system of claim 10, wherein the first filter coefficient memory and the second filter coefficient memory are integrated into one filter coefficient memory;
the downlink IQ data adaptation processing module and the uplink IQ data adaptation processing module are integrated in an IQ data adaptation processing module.
12. A downlink IQ data adaptation method for a distributed antenna system, comprising:
reading access unit information from the access unit and remote unit information from the remote unit;
according to the access unit information, a first multichannel serial IQ data stream obtained through an access unit is deframed 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;
framing the second single-channel parallel IQ data stream obtained by resampling according to 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 the first resampling module according to the remote unit information;
the resampling the obtained 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, comprising:
reading access unit information from the access unit and remote unit information from the remote unit;
de-framing a third multi-channel 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;
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.
15. The method of claim 14, wherein prior to said resampling said derived third single-channel parallel IQ data stream, the method further comprises:
determining a second filter coefficient of the second resampling module according to the access unit information;
the resampling the obtained third single-channel parallel IQ data stream, comprising:
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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