CN107888208B - Radio frequency topology system for LTE-FDD carrier aggregation - Google Patents
Radio frequency topology system for LTE-FDD carrier aggregation Download PDFInfo
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- CN107888208B CN107888208B CN201711131136.6A CN201711131136A CN107888208B CN 107888208 B CN107888208 B CN 107888208B CN 201711131136 A CN201711131136 A CN 201711131136A CN 107888208 B CN107888208 B CN 107888208B
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- radio frequency
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Abstract
The invention relates to communication data transmission, in particular to a radio frequency topological system. Including radio frequency antenna receiving circuit and radio frequency antenna transmitting circuit, the downlink channel data is received to radio frequency antenna receiving circuit, includes: the receiving antenna receives signals within a preset frequency range; the receiving antenna switch controls the working state of the radio frequency antenna receiving circuit; the first band-pass filter is used for filtering and outputting the signals sent by the receiving antenna switch; a frequency divider for dividing the frequency of the signal transmitted by the receiving antenna switch into signals with different frequencies and outputting the signals; the radio frequency antenna transmitting circuit transmits uplink channel data, and the method comprises the following steps: the frequency synthesizer is used for synthesizing the frequency of a plurality of signals to be transmitted; the second band-pass filter is used for filtering the uplink passband data; the transmitting antenna switch controls the working state of the radio frequency antenna transmitting circuit; the implementation of the multi-carrier technology becomes simple by using filters, frequency dividers and frequency combiners with relatively simple technology to replace multiplexers with complex technology.
Description
Technical Field
The invention relates to a radio frequency topological system, in particular to a radio frequency topological system aiming at LTE-FDD carrier aggregation.
Background
In the field of communications, one of the most straightforward solutions to meet the requirements of peak single-user rates and system capacity increases is to increase the system transmission bandwidth. However, under the existing frequency band distribution condition, it is difficult to find a continuous spectrum resource for use, so that the LTE-Advanced (Long Term Evolution-Advanced, Long Term Evolution technology upgrade) system introduces a technology for increasing transmission bandwidth, namely CA (Carrier Aggregation).
The current topology structure of carrier aggregation is shown in fig. 1, where ANT1 is an antenna, IC1 is an antenna switch, IC2 is a duplexer, and IC3 is a quadplexer. The topology shares one antenna ANT1 for both reception and transmission. The upstream and downstream passbands for data signals, command signals, need to be separated by diplexer IC2, quad-plexer IC 3. For LTE-FDD (Long Term Evolution-Frequency Division duplex), the uplink and downlink bands are separated. Any duplexer, which functions as two band pass filters, as shown in fig. 2, is easy to cause data interference between uplink and downlink, especially interference of uplink transmission to downlink reception, when the guard bandwidth of uplink and downlink frequency bands is not wide enough.
Disclosure of Invention
Aiming at the problem that the interference is easily caused by the uplink and downlink channels of the existing duplexer, the invention provides a radio frequency topological system aiming at LTE-FDD carrier aggregation.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a radio frequency topology system for LTE-FDD carrier aggregation comprising radio frequency antenna receive circuitry and radio frequency antenna transmit circuitry, wherein:
the radio frequency antenna receiving circuit is used for receiving downlink channel data, and comprises:
the receiving antenna receives signals within a preset frequency range;
the receiving antenna switch is connected with the receiving antenna and used for controlling the working state of the radio frequency antenna receiving circuit;
the first band-pass filter is connected with the receiving antenna switch and used for filtering and outputting signals sent by the receiving antenna switch;
a frequency divider connected to the receiving antenna switch, for dividing the frequency of the signal transmitted by the receiving antenna switch into signals with different frequencies and outputting the signals;
the radio frequency antenna transmitting circuit is used for transmitting uplink channel data, and comprises:
the frequency synthesizer is used for synthesizing the frequency of a plurality of signals to be transmitted;
the second band-pass filter is used for filtering the uplink passband data;
the transmitting antenna switch is respectively connected with the frequency synthesizer and the second band-pass filter and is used for controlling the working state of the radio-frequency antenna transmitting circuit;
and the transmitting antenna is connected with the transmitting antenna switch and used for sending the signals transmitted by the transmitting antenna switch.
Preferably, the mobile terminal further comprises a first receiving signal terminal connected to the first band-pass filter, and configured to transmit the signal processed by the first band-pass filter to the first receiving signal terminal.
Preferably, the apparatus further comprises a plurality of divided signal terminals connected to the frequency divider, for outputting the signals divided by the frequency divider to the respective divided signal terminals.
Preferably, the uplink signal processing device further comprises a first sending signal end connected to the second band-pass filter, and is configured to transmit the uplink signal to be sent to the second band-pass filter for filtering.
Preferably, the mobile terminal further includes a plurality of frequency synthesizer signal terminals connected to the frequency synthesizer, and configured to transmit each frequency synthesizer signal to be frequency synthesized to the frequency synthesizer for frequency synthesis.
Preferably, the radio frequency antenna device further comprises a heat radiator for radiating the radio frequency antenna receiving circuit and the radio frequency antenna transmitting circuit.
Preferably, the radiator is a plate radiator or a liquid cooling radiator.
Preferably, the transmitting antenna switch transmits a wireless broadcast signal to the receiving antenna switch through a plurality of asynchronous or synchronous physical frames on a plurality of carrier frequencies within each carrier aggregation period.
Preferably, the receiving antenna switch receives the radio broadcast signals on a plurality of physical frames using a single wide band tuner or a plurality of narrow band tuners.
Preferably, the carrier of the carrier aggregation is a carrier of a discrete frequency band.
The invention has the beneficial effects that: the radio frequency topological system for LTE-FDD carrier aggregation is divided into two independent circuits, namely a radio frequency antenna receiving circuit and a radio frequency transmitting antenna circuit, and antenna receiving and antenna transmitting are physically separated, so that data interference on an uplink and a downlink is reduced, and the data receiving and transmitting performance of the mobile terminal is improved. And a filter, a frequency divider and a frequency synthesizer with relatively simple technology are used for replacing a multiplexer with complex technology, so that the implementation of the multi-carrier technology becomes simple.
Drawings
Fig. 1 is a schematic diagram of an LTE carrier aggregation topology in the prior art;
FIG. 2 is a schematic diagram of two filter passbands of the duplexer of FIG. 1;
fig. 3 is a schematic diagram of a radio frequency topology system for LTE-FDD carrier aggregation according to the present invention.
Detailed Description
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
The duplexer in fig. 1 is the bottleneck device of LTE-FDD. For carrier aggregation, a quadplexer needs to include four filters, i.e., four pass bands, so that integrating multiple band pass filters in a limited space is easy to cause uplink and downlink data interference, and is also not easy to reduce the interference. The core of carrier aggregation is to combine multiple radio channels in a frequency band and across frequency bands to be used as a wider frequency band, and high-speed transmission over a wide frequency band is realized through uniform baseband processing, so that delay is reduced.
Therefore, the present invention provides a radio frequency topology system for LTE-FDD carrier aggregation as shown in fig. 3, which is mainly divided into two independent circuits, namely a radio frequency antenna receiving circuit and a radio frequency antenna transmitting circuit, and physically separates the receiving part and the transmitting part, thereby reducing data interference of an uplink channel and a downlink channel.
Specifically, the rf antenna receiving circuit is configured to receive data of a downlink channel, and includes: a receive antenna ANT2, a receive antenna switch IC4, a first band pass filter IC5, and a divider IC 6. The receiving antenna ANT2 is configured to receive a signal in a preset frequency range. The receiving antenna switch IC4 has one end connected to the receiving antenna ANT2 and the other end connected to the first band pass filter IC5 and the frequency divider IC6, respectively, and is mainly used to control the operating state of the whole rf antenna receiving circuit, such as controlling the on or off of the receiving antenna ANT2, so that the antenna receives or does not receive signals. The first bandpass filter IC5 filters the downlink passband data, that is, filters the signal transmitted from the receiving antenna switch IC4, and outputs the filtered signal to the first receiving signal terminal RX3 connected to the other end of the first bandpass filter IC. The frequency divider IC6 divides the frequency of the signal received by the receiving antenna switch IC4 into signals of different frequencies, and outputs the signals to respective divided signal terminals (RX4, RX5), two divided signal terminals being used in the present embodiment.
The radio frequency antenna transmitting circuit is used for transmitting uplink channel data, and comprises: a transmitting antenna ANT3, a transmitting antenna switch IC7, a second band-pass filter IC8 and a synthesizer IC 9. The structure of the radio frequency antenna transmitting circuit is described in the sequence of signal flow. First, a plurality of synthesizer signal terminals (TX4, TX5) are connected to an input terminal of the synthesizer IC9, and each synthesizer signal to be synthesized is transmitted to the synthesizer IC9 for frequency synthesis. Secondly, the transmitter further comprises a first transmitting signal terminal TX3 connected to the second band-pass filter IC8, the signal to be transmitted is transmitted to the second band-pass filter IC8, and the second band-pass filter IC8 filters the signal. One end of the transmitting antenna switch IC7 is connected to the frequency synthesizer IC9 and the second band-pass filter IC8, respectively, and is used for controlling the operating state of the rf antenna transmitting circuit, such as transmitting or not transmitting the filtered signal and the frequency-synthesized signal to the transmitting antenna ANT 3; the other end of the transmitting antenna switch IC7 is connected to a transmitting antenna ANT3, and transmits a signal to be transmitted to a transmitting antenna ANT3 for transmission.
In addition, the system further includes a heat sink (not shown) for dissipating heat of the rf antenna receiving circuit and the rf antenna transmitting circuit, and the heat sink may be a finned heat sink or a liquid-cooled heat sink.
In a preferred embodiment of the present invention, the transmitting antenna switch transmits the wireless broadcast signal to the receiving antenna switch through a plurality of asynchronous or synchronous physical frames on a plurality of carrier frequencies in each carrier aggregation period. Further, the carrier of the carrier aggregation is a carrier of a discrete frequency band. Wherein, a carrier aggregation period refers to the time for completing one carrier aggregation, and the carrier aggregation period is indicated by physical layer signaling.
In a preferred embodiment of the present invention, the receiving antenna switch receives the radio broadcast signals over a plurality of physical frames using a single wideband tuner or a plurality of narrowband tuners.
Due to the emergence of the antenna debugging technology, the space required by the antenna is smaller and smaller, so that the space required by the dual antenna in the invention is no longer a technical bottleneck. As for the synchronous control of the uplink and downlink channel data transmission, the control can be performed in the rf antenna receiving circuit and the rf antenna transmitting circuit. The invention uses the filter with relatively simple technology, the frequency divider IC6 and the frequency synthesizer IC9 to replace the multiplexer with complex technology, so that the realization of the multi-carrier technology becomes simple, the data interference of the uplink and downlink channels is reduced, and the data receiving and transmitting performance is improved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A radio frequency topology system for LTE-FDD carrier aggregation comprising radio frequency antenna receive circuitry and radio frequency antenna transmit circuitry, wherein:
the radio frequency antenna receiving circuit is used for receiving downlink channel data, and comprises:
the receiving antenna receives signals within a preset frequency range;
the receiving antenna switch is connected with the receiving antenna and used for controlling the working state of the radio frequency antenna receiving circuit;
the first band-pass filter is connected with the receiving antenna switch and used for filtering and outputting signals sent by the receiving antenna switch;
a frequency divider connected to the receiving antenna switch, for dividing the frequency of the signal transmitted by the receiving antenna switch into signals with different frequencies and outputting the signals;
the radio frequency antenna transmitting circuit is used for transmitting uplink channel data, and comprises:
the frequency synthesizer is used for synthesizing the frequency of a plurality of signals to be transmitted;
the second band-pass filter is used for filtering the uplink passband data;
the transmitting antenna switch is respectively connected with the frequency synthesizer and the second band-pass filter and is used for controlling the working state of the radio-frequency antenna transmitting circuit;
the transmitting antenna is connected with the transmitting antenna switch and used for sending the signals transmitted by the transmitting antenna switch;
the transmitting antenna switch transmits wireless broadcast signals to the receiving antenna switch through a plurality of asynchronous or synchronous physical frames on a plurality of carrier frequencies within each carrier aggregation period; the carrier aggregation period is indicated by physical layer signaling;
and synchronously controlling the transmission of the uplink channel data and the downlink channel data in the radio frequency antenna receiving circuit and the radio frequency antenna transmitting circuit.
2. The radio frequency topology system for LTE-FDD carrier aggregation according to claim 1, further comprising a first receive signal terminal connected to the first band-pass filter for transmitting the signal processed by the first band-pass filter to the first receive signal terminal.
3. The radio frequency topology system for LTE-FDD carrier aggregation according to claim 1, further comprising a plurality of divided signal terminals connected to the frequency divider for outputting the signal divided by the frequency divider to each divided signal terminal respectively.
4. The radio frequency topology system for LTE-FDD carrier aggregation according to claim 1, further comprising a first transmit signal terminal connected to the second band-pass filter, for transmitting the uplink signal to be transmitted to the second band-pass filter for filtering.
5. The radio frequency topology system for LTE-FDD carrier aggregation according to claim 1, further comprising a plurality of frequency synthesizer signal terminals connected to the frequency synthesizer, for transmitting respective frequency synthesized signals to be frequency synthesized to the frequency synthesizer for frequency synthesis.
6. The radio frequency topology system for LTE-FDD carrier aggregation according to claim 1, further comprising a heat sink for heat dissipation of the radio frequency antenna receive circuitry and radio frequency antenna transmit circuitry.
7. The radio frequency topology system for LTE-FDD carrier aggregation according to claim 6, wherein the heat sink is a finned heat sink or a liquid-cooled heat sink.
8. The radio frequency topology system for LTE-FDD carrier aggregation of claim 1 wherein the receive antenna switch employs a single wideband tuner or multiple narrowband tuners to receive over-the-air broadcast signals on multiple physical frames.
9. The radio frequency topology system for LTE-FDD carrier aggregation of claim 1 wherein the carrier aggregated carriers are discrete band carriers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711131136.6A CN107888208B (en) | 2017-11-15 | 2017-11-15 | Radio frequency topology system for LTE-FDD carrier aggregation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711131136.6A CN107888208B (en) | 2017-11-15 | 2017-11-15 | Radio frequency topology system for LTE-FDD carrier aggregation |
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| CN107888208A CN107888208A (en) | 2018-04-06 |
| CN107888208B true CN107888208B (en) | 2021-09-10 |
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| CN110504984A (en) * | 2019-09-02 | 2019-11-26 | 联想(北京)有限公司 | A kind of electronic equipment |
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| CN105322980A (en) * | 2015-02-04 | 2016-02-10 | 维沃移动通信有限公司 | Method and device for sending and receiving carrier aggregation signals of different frequency bands |
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| CN107888208A (en) | 2018-04-06 |
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