CN202565269U - A TD-LTE indoor division MIMO frequency conversion system - Google Patents

Abstract

The utility model relates to a mobile communication network equipment provides a TD-LTE room branch MIMO frequency conversion system that can not produce the interference or will not be disturbed by other systems to other indoor wireless systems, including near-end machine and remote terminal, near-end machine output and remote terminal input are connected through feed line system, near-end machine includes the same radio frequency signal transfer passage of multichannel transport mode, combiner and surveillance center unit, the remote terminal includes the same radio frequency signal transfer passage of combiner, multichannel transport mode, antenna and surveillance center unit, is the reference frequency local oscillator through each local oscillator with in each radio frequency signal transfer passage.

Description

A TD-LTE room division MIMO frequency conversion system

technical field

The utility model relates to mobile communication network equipment, in particular to a TD-LTE indoor division MIMO frequency conversion system. the

Background technique

Multi-antenna technology (MIMO for short) is one of the key technologies of 4G LTE. Using multi-antenna technology (transmit or receive diversity, spatial multiplexing and beamforming), that is, multiple transceiver channels work at the same time, so that the data of the base station cell Throughput is almost doubled. At present, the indoor distribution systems used by 2 and 3G base stations all support a single channel, and the frequency band is generally 800M-2.6G frequency band, which cannot transmit 2 and 3G multi-channel RF signals of indoor base stations at the same time, so that the technical advantages of 4G LTE cannot be utilized. The solution is to use the frequency conversion room sub-system, and the basic requirement of the frequency conversion room sub-system is the consistency of the far and near end frequencies of the system. In order to make the frequencies of the far end and the near end consistent, the current general solution is to transmit the same local oscillator in the original room distribution system. However, if the local oscillator frequency is high, it will leak in the antenna or coupler of the original system, which will affect other systems, and due to the reception of the original antenna, similar frequencies will also interfere with the frequency conversion system. the

Utility model content

Therefore, in view of the above problems, the utility model proposes a TD-LTE indoor MIMO frequency conversion system that will not interfere with or be interfered with by other indoor wireless systems. the

In order to solve this technical problem, the utility model adopts the following scheme: a TD-LTE room division MIMO frequency conversion system, which is characterized in that: it includes a near-end unit and a far-end unit, and the output end of the near-end unit and the input end of the far-end unit connected via the feeder system;

The near-end unit includes a radio frequency signal transmission channel, a combiner and a monitoring center unit in the same multiplex transmission mode. The radio frequency signal transmission channel is to receive the radio frequency signal of the base station. After detection, the first switch controlled by the control unit is divided into two signals: the downlink radio frequency signal and the uplink radio frequency signal. The downlink radio frequency signal is processed by the attenuator, and then sent to the frequency converter combined with the first local oscillator controlled by the control unit for frequency conversion, and then the downlink radio frequency signal is amplified and filtered by the power amplifier and filter, and finally passed through the first local oscillator controlled by the control unit. After the second switch, it is sent to the combiner; while the uplink radio frequency signal is filtered and amplified by the filter and power amplifier, and then sent to the frequency converter combined with the first local oscillator controlled by the control unit for frequency conversion, and then the control unit controls the step The attenuator performs synchronous processing on the uplink radio frequency signal, and then the uplink radio frequency signal is amplified and filtered by the power amplifier and filter, and finally sent to the combiner after passing through the second switch controlled by the control unit, and the combiner combines each The radio frequency signal and each local oscillator are combined into the feed system for long-distance signal transmission, and each local oscillator in each radio frequency signal transmission channel is a reference frequency local oscillator, and the control units of each radio frequency signal transmission channel are connected to each other. The monitoring center unit is connected;

The remote machine includes a combiner, a radio frequency signal transmission channel with the same multiplex transmission mode, an antenna and a monitoring center unit. The radio frequency signal transmission channels of each road respectively receive the radio frequency signal sent by the combiner, and the radio frequency signal passes through the wave detection. The detector detects and sends the information to the control unit. After the detection, the first switch controlled by the control unit is divided into two signals: the downlink radio frequency signal and the uplink radio frequency signal. The downlink radio frequency signal is filtered and amplified by a filter and a power amplifier. The control unit controls the step attenuator to process the downlink radio frequency signal, and then sends it to the frequency converter combined with the local oscillator controlled by the control unit sent by the combiner for frequency conversion, and then the downlink radio frequency signal is amplified by the power amplifier and filter. Filtering processing, and finally sent to the antenna for transmission through the second switch controlled by the control unit; while the uplink radio frequency signal is filtered and amplified by the filter and power amplifier, and then sent to the control unit controlled by the frequency converter combined with the combiner The local oscillator performs frequency conversion, and then the control unit controls the step attenuator to synchronously process the uplink radio frequency signal, and then the uplink radio frequency signal is amplified and filtered by the power amplifier and filter, and finally passes through the second switch controlled by the control unit The control unit of each radio frequency signal transmission channel is connected with the monitoring center unit.

By adopting the aforementioned technical scheme, the beneficial effect of the utility model is: because the reference frequency is very low, it cannot be transmitted in the original coupler and antenna, but the loss is very small when transmitting in the original cable, so the system of the utility model passes The reference frequency local oscillator is used to replace the original intermediate frequency local oscillator, so that this system not only solves the problem of transmitting the useless local oscillator frequency in the air most effectively, but also solves the problem of the interference of the local oscillator to other systems, and also solves the problem of the local oscillator being disturbed by other systems. System interference problem, maximize the advantages of 4G technology. the

Description of drawings

Fig. 1 is a system block diagram of the utility model embodiment. the

Detailed ways

The utility model is further described now in conjunction with accompanying drawing and specific embodiment. the

The utility model is applicable to the TD-LTE room division MIMO frequency conversion system with two or more channels. The utility model will further describe the utility model in detail by taking the two-channel radio frequency transmission as an embodiment below. the

Referring to Fig. 2, a preferred TD-LTE room division MIMO frequency conversion system of the present invention includes a near-end unit 1 and a far-end unit 2, and the output end of the near-end unit 1 and the input end of the far-end unit 2 pass through the feeder system 3-phase connection;

Described near-end machine 1 comprises the same radio frequency signal transmission path of A, B two-way transmission mode, combiner 12 and monitoring center unit 13, and described A path radio frequency signal transmission path is to receive the radio frequency signal from base station, through coupler After 101 coupling, it enters the wave detector 102 for wave detection and sends the information to the control unit 104. After wave detection, the first switch 104 controlled by the control unit 103 is divided into two signals, the downlink radio frequency signal and the uplink radio frequency signal. The downlink radio frequency signal is passed through the filter 105. and the power amplifier 106 for filtering and amplification processing, and then the control unit 103 controls the step attenuator 107 to process the downlink radio frequency signal, and then sends it to the frequency converter 109 in conjunction with the first local oscillator 109 controlled by the control unit 103 for frequency conversion, and then the downlink radio frequency The signal is amplified and filtered by the power amplifier 110 and filter 111, and finally sent to the combiner 12 after passing through the second switch 112 controlled by the control unit 103; while the uplink radio frequency signal is filtered by the filter 113 and the power amplifier 114 , amplification processing, and then sent to the frequency converter 115 in combination with the first local oscillator 109 controlled by the control unit 103 for frequency conversion, and then the control unit 103 controls the step attenuator 116 to perform synchronous processing on the uplink radio frequency signal, and then the uplink radio frequency signal is passed through The power amplifier 117 and the filter 118 carry out amplification and filtering processing, and finally pass through the second switch 112 controlled by the control unit 103 and send it to the combiner 12. The A and B radio frequency signals, the first local oscillator 109 and the second local oscillator 119 are combined into the feed system 3 for long-distance signal transmission, wherein the control units of the A and B two radio frequency signal transmission channels are It is connected with the monitoring center unit 13, wherein both the first local oscillator 109 and the second local oscillator 119 are local oscillators with a reference frequency, and the frequency of the reference frequency local oscillator is 12.8MHz.

The remote machine 2 includes a combiner 21, A and B two-way radio frequency signal transmission channels, an A antenna 22, a B antenna 23 and a monitoring center unit 24, and the A and B two-way radio frequency signal transmission channels are respectively received by the combination Router 21 sends out radio frequency signals, wherein the radio frequency signal of channel A is detected by the detector 201 and the information is sent to the control unit 202, after detection, the first switch 203 controlled by the control unit 202 is divided into two channels of downlink radio frequency signal and uplink radio frequency signal , wherein the downlink radio frequency signal is filtered and amplified by the filter 204 and the power amplifier 205, and then the control unit 202 controls the step attenuator 206 to process the downlink radio frequency signal, and then sends it to the frequency converter 207 to combine the via combiner 21. The first local oscillator controlled by the control unit 202 performs frequency conversion, and then the downlink radio frequency signal is amplified and filtered by the power amplifier 208 and the filter 209, and finally sent to the A antenna 22 for transmission after passing through the second switch 210 controlled by the control unit 202. ; and the uplink radio frequency signal is filtered and amplified by the filter 211 and the power amplifier 212, and then sent to the frequency converter 213 in conjunction with the second local oscillator controlled by the control unit 202 sent by the combiner 21 for frequency conversion, and then by the control unit 202 controls the step attenuator 214 to perform synchronous processing on the uplink radio frequency signal, then the uplink radio frequency signal is amplified and filtered by the power amplifier 215 and the filter 216, and finally sent to the antenna 22 after passing through the second switch 210 controlled by the control unit 202 Transmission, the transmission mode of the B-way radio frequency signal is the same as that of the A way, and the B-way radio frequency signal is transmitted by the B antenna 23 through automatic regulation and control, and the control units of the A and B two-way radio frequency signal transmission channels are all connected to the monitoring center unit 24 The first local oscillator and the second local oscillator are both the reference frequency local oscillator from the near-end machine sent by the combiner, and the frequency of the reference frequency local oscillator is 12.8MHz

Wherein the frequency of the reference frequency local oscillator adopted by the utility model can also be 10 MHz.

Because the reference frequency is very low, it cannot be transmitted in the original coupler and antenna, but the loss is very small when transmitting in the original cable, so the utility model system replaces the original intermediate frequency local oscillator by using the reference frequency local oscillator, so that This system not only most effectively solves the problem of transmitting the useless local oscillator frequency in the air, but also solves the problem of local oscillator interference to other systems, and also solves the problem of local oscillator being interfered by other systems, and maximizes the advantages of 4G technology. the

Although the utility model has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the appended claims, changes in form and details may be made. Making various changes to the utility model is within the protection scope of the utility model. the

Claims (1)

1. A TD-LTE room divides MIMO frequency conversion system, is characterized in that: comprise near-end machine and far-end machine, described near-end machine output end and far-end machine input end are connected through feeder system; The near-end unit includes a radio frequency signal transmission channel, a combiner and a monitoring center unit in the same multiplex transmission mode. The radio frequency signal transmission channel is to receive the radio frequency signal of the base station. After detection, the first switch controlled by the control unit is divided into two signals: the downlink radio frequency signal and the uplink radio frequency signal. The downlink radio frequency signal is processed by the attenuator, and then sent to the frequency converter combined with the first local oscillator controlled by the control unit for frequency conversion, and then the downlink radio frequency signal is amplified and filtered by the power amplifier and filter, and finally passed through the first local oscillator controlled by the control unit. After the second switch, it is sent to the combiner; while the uplink radio frequency signal is filtered and amplified by the filter and power amplifier, and then sent to the frequency converter combined with the first local oscillator controlled by the control unit for frequency conversion, and then the control unit controls the step The attenuator performs synchronous processing on the uplink radio frequency signal, and then the uplink radio frequency signal is amplified and filtered by the power amplifier and filter, and finally sent to the combiner after passing through the second switch controlled by the control unit, and the combiner combines each The radio frequency signal and each local oscillator are combined into the feed system for long-distance signal transmission, and each local oscillator in each radio frequency signal transmission channel is a reference frequency local oscillator, and the control units of each radio frequency signal transmission channel are connected to each other. The monitoring center unit is connected; The remote machine includes a combiner, a radio frequency signal transmission channel with the same multiplex transmission mode, an antenna and a monitoring center unit. The radio frequency signal transmission channels of each road respectively receive the radio frequency signal sent by the combiner, and the radio frequency signal passes through the wave detection. The detector detects and sends the information to the control unit. After the detection, the first switch controlled by the control unit is divided into two signals: the downlink radio frequency signal and the uplink radio frequency signal. The downlink radio frequency signal is filtered and amplified by a filter and a power amplifier. The control unit controls the step attenuator to process the downlink radio frequency signal, and then sends it to the frequency converter combined with the local oscillator controlled by the control unit sent by the combiner for frequency conversion, and then the downlink radio frequency signal is amplified by the power amplifier and filter. Filtering processing, and finally sent to the antenna for transmission through the second switch controlled by the control unit; while the uplink radio frequency signal is filtered and amplified by the filter and power amplifier, and then sent to the control unit controlled by the frequency converter combined with the combiner The local oscillator performs frequency conversion, and then the control unit controls the step attenuator to synchronously process the uplink radio frequency signal, and then the uplink radio frequency signal is amplified and filtered by the power amplifier and filter, and finally passes through the second switch controlled by the control unit The control unit of each radio frequency signal transmission channel is connected with the monitoring center unit.

Images