TW202119769A - Wireless communication receiving system - Google Patents

Abstract

The present invention discloses a wireless communication receiving system, including an array antenna, a plurality of phase shifters, a plurality of filters, a plurality of signal transceiving amplifiers, a plurality of frequency converters, and a combiner. The array antenna includes a plurality of sub-antennas, and the phase shifters are frequency segments that select to receive the connected sub-antennas, and the filters are signals of the antenna frequency segments that the sub-antenna antennas should not receive, and the signal transceiving amplifiers are amplified signals. The frequency converter selectively converts at least one of the filtered amplified signals to a designated frequency segment, and the combiner connects the frequency converters, and the combiner combines the output signals of the frequency converters into a combined signal. The signals received by each sub-antenna are separately amplified, frequency-converted, and finally combined, which can offset the insertion loss and reduce the noise coefficient.

Description

Wireless communication receiving system

This application relates to a wireless communication receiving system, in particular to a wireless communication receiving system that is applied to frequency conversion, widening the frequency band, and receiving radio frequency links with low noise.

Wireless communication is a technical system used to complete the process of information transmission. With the rapid development of wireless communication requirements and the rapid increase in multimedia information exchanges, wireless communication technology must meet the application requirements of high speed, high capacity, high quality, and high flexibility. Need to rely on high-efficiency spectrum utilization technology to support. The common receiving antenna array in the communication field will be equipped with a combiner. The combiner can contract the signals of different frequency bands of different devices as a signal to be sent and received through the antenna. The existing combiners are all equipped with bandpass filters and before the amplifiers. When the antenna receives the signal and enters the receiving channel through the combiner, the receiving gain of the entire antenna array will decrease due to the large insertion loss of the combiner, thereby increasing the noise coefficient of the entire wireless communication receiving system. That is, the signal-to-noise ratio is reduced.

The present application provides a wireless communication receiving system to solve the problem that the front-end circuit of the receiving antenna array greatly reduces the receiving gain of the antenna array due to the insertion loss of the combiner, thereby reducing the signal-to-noise ratio.

In order to solve the above technical problems, this application is implemented as follows: a wireless communication receiving system is provided, which includes an array antenna, a plurality of phase shifters, a plurality of filters, a plurality of signal transceiver amplifiers, a plurality of frequency converters, and a combiner. . The array antenna includes a plurality of sub-antennas; these phase shifters are respectively connected to each sub-antenna, and these phase shifters are used to select the frequency band of the corresponding connected sub-antennas; these filters are respectively connected to each phase shifter, and these The filter is to shield the signal of the antenna frequency band that the sub-antenna should not receive; these signal transceiver amplifiers are respectively connected to each filter, these signal transceiver amplifiers are to amplify the signal; these frequency converters are respectively connected to each signal transceiver amplifier, this Some frequency converters selectively convert at least one of the filtered and amplified signals to the specified frequency range; the combiner is connected to these frequency converters, and the combiner combines the output signals of all these frequency converters into a combined signal .

In the embodiment of the present application, the signal received by each sub-antenna in the antenna array is individually amplified, and after selective frequency conversion, at least one of the filtered and amplified signals is converted to a specified frequency range, and finally used The combiner combines all the output signals received from the inverter, so that it can offset the insertion loss of the existing combiner at the front end of the amplifier, and effectively reduce the noise coefficient, which is equivalent to improving the signal-to-noise ratio. The noise ratio is a main technical indicator to measure the reliability of the communication quality of the communication system. The larger the signal-to-noise ratio, the smaller the noise signal carried in the signal, and the smaller the impact on the signal transmission.

In order to have a further understanding and understanding of the features of this application and the achieved effects, only examples and detailed descriptions are provided, and the description is as follows:

The purpose of this application is to improve the existing problem of low signal-to-noise ratio caused by the insertion loss of the combiner when the antenna array is formed by combining. Therefore, the design of the wireless communication receiving system is improved. Please refer to FIG. 1. FIG. 1 is a circuit diagram of the wireless communication receiving system of the present application. The wireless communication receiving system includes an array antenna 10, a plurality of phase shifters 12, a plurality of filters 14, a plurality of signal transceiver amplifiers 16, a plurality of frequency converters 18, and a combiner 20. The array antenna 10 includes a plurality of sub-antennas 102, the phase shifters 12 are respectively connected to each sub-antenna 102, the filters 14 are respectively connected to each phase shifter 12, and the signal transceiver amplifiers 16 are respectively connected to each filter 14 These frequency converters 18 are respectively connected to each signal transceiver amplifier 16, these frequency converters 18 are respectively connected to each signal transceiver amplifier 16, and the combiner 20 is connected to these frequency converters 18; it can be seen from the above circuit connection relationship, Each sub-antenna 102 is individually connected to a phase shifter 12, a filter 14, a signal transceiver amplifier 16, and a frequency converter 18. Finally, the output terminals of all frequency converters 18 will be connected via a combiner 20 In this way, the insertion loss problem of the combined circuit can be solved, and the signal-to-noise ratio can be effectively improved for the overall receiving radio frequency link, which will be described in detail later.

Among them, the filter 14 may preferably be a frequency division duplex module (Frequency Division Duplex) or a time division duplex module (Time Division Duplex). In order to make full use of communication channels, expand communication capacity, and reduce communication costs, many communication systems use multiplexing methods, that is, multiple pieces of information are simultaneously transmitted on the same transmission path. Multiplexing is divided into frequency division, time division and code division multiplexing. In the analog communication system, the divided available frequency bands are allocated to various information and share a common transmission medium, which is called Frequency Division Duplex. In a digital communication system, a time slot (short time period) is allocated to each information, and each channel takes turns to occupy the time slot in turn, which is called Time Division Duplex.

The array antenna 10 refers to both the transmitting end and the receiving end. The difference is that one is the transmitting signal and the other is the receiving signal. Each signal transceiver amplifier 16 further includes a receiving amplifier 162 and a transmitting amplifier 164. The transmitting amplifier 164 transmits and amplifies the designated frequency band to the corresponding sub-antenna 102, that is to say, the beamforming at the transmitting end is performed by a phase shifter. 12 Move the phase of the signal emitted by each transmitting unit (not shown in the figure). After the sub-antenna 102 receives the signal, the phase shifters 12 select the frequency range of the corresponding connected sub-antenna 102, and these filters 14 cover the signal of the antenna frequency range that the sub-antenna should not receive, that is, Pass useful carrier signals, such as other high-frequency noise or useless signals to filter out. Since the signal in the antenna frequency range is very weak, each of the filtered signals must be amplified by these signal transceiver amplifiers 16, which belong to the receiving radio frequency link, so the receiving amplifier 162 is used to amplify the signal. The frequency converters 18 selectively convert at least one of the filtered and amplified signals to a designated frequency range. That is, the signal received by the sub-antenna 102 may be in the same frequency range or part of the sub-antenna 102 The received signals are in different frequency bands, and finally the filtered and amplified signals are converted to the designated frequency band through these frequency converters 18, as shown in the frequency spectrum of FIG. 2, for example, the F1 frequency band of the sub-antenna 102a is 1920~1925MHz, the F2 frequency range of the sub-antenna 102b is 1960~1965MHz, the F3 frequency range of the sub-antenna 102c is 1920~1925MHz, the frequency converter 18 can choose to transfer the F3 frequency range of the sub-antenna 102c from 1920~1925MHz to the specified frequency In the frequency range of 1975~1980MHz, the combiner 20 finally combines the output signals of all the plurality of frequency converters 18 into a combined signal, as shown in Fig. 2. From the frequency spectrum, it can be seen that the signal-to-noise ratio is effectively improved.

Since the signal-to-noise ratio of the existing receiving RF link refers to the signal-to-noise ratio at the output of the sub-antenna, the insertion loss of the phase shifter and the insertion loss of the combiner, and the noise coefficient of the receiving link at the back of the combiner, the overall system produces The noise coefficient of is quite large, which reduces the signal-to-noise ratio relatively. SNR (Signal to Noise Ratio) is the ratio of the signal to the noise in the system. The signal comes from the external electronic signal that needs to be processed by the equipment. Noise refers to the original signal generated after the system does not exist. The irregular extra signal, which is related to the environment, does not change with the change of the original signal. Therefore, in the present application, the combiner 20 is designed at the back end of the receiving radio frequency link, and the combined signal is processed by a signal processor (not shown in the figure) at the back end to reduce the deterioration of the signal-to-noise ratio, in other words, the combined signal Since the signal is amplified by the signal transceiver amplifier 16 before the signal, the deterioration of the signal-to-noise ratio caused by the insertion loss of the combiner 20 can be ignored. This application solves the problem of the insertion loss of the combiner 20 arranged at the front end of the amplifier.

Among them, each frequency converter 18 further includes two frequency synthesizers, and the signal is converted to a designated frequency band through two frequency conversions of the two frequency synthesizers. Each frequency converter 18 further includes an intermediate frequency filter 22, The intermediate frequency filter 22 is electrically connected between the two frequency synthesizers. Since the input frequency of the IF filter is fixed, the function of the two frequency synthesizers is to reduce the target frequency to the frequency of the intermediate frequency. The intermediate frequency filter here has two functions. One is to filter out some high-frequency noise as a supplement to the filter 14, and the other is to filter out local oscillator leakage, harmonics, PIM, half-IF, etc. generated during the frequency conversion process. Spurious signals.

As shown in FIG. 3, it is another circuit diagram of the wireless communication receiving system of the present application. The circuit architecture of this embodiment is similar to the above, so the similarities will not be repeated here. Only the different technical features are described here. The plurality of signal transceiver amplifiers 16 further include a plurality of receiving amplifiers 162 and a transmitting amplifier 164. The transmitting amplifier 164 is Correspondingly connected to a plurality of filters 14 through a divider 24. The divider 24 equally divides the power of a signal from the transmitting amplifier 164 to the output port, and realizes the power distribution function of the wireless signal.

In summary, the present application provides a wireless communication receiving system. The signal received by each sub-antenna in the antenna array is individually amplified, and the signal after at least one of the filtered and amplified signals is converted and transferred to all through selective frequency conversion. The specified frequency range is finally combined with all the output signals received from the inverter by the combiner, which can offset the insertion loss of the existing combiner at the front end of the amplifier, effectively reduce the noise coefficient, and improve the signal noise. In other words, the signal-to-noise ratio is based on the output signal-to-noise ratio of these sub-antennas, the insertion loss of these phase shifters, these filters, these signal transceiver amplifiers, these frequency converters, and combiners. Determined by the total noise coefficient.

However, the above are only examples of this application, and are not used to limit the scope of implementation of this application. For example, the shape, structure, features and spirit described in the scope of the patent application of this application have equal changes and modifications. , Should be included in the scope of patent application of this application.

10: Array antenna 102: Sub-antenna 102a, 102b, 102c: sub-antenna 12: Phase shifter 14: filter 16: Signal Transceiver Amplifier 162: receiving amplifier 164: Transmit amplifier 18: Inverter 20: Combiner 22: IF filter 24: divider

Fig. 1 is a circuit diagram of the wireless communication receiving system of the present application. Figure 2 is a spectrum diagram of the present application. Fig. 3 is another circuit diagram of the wireless communication receiving system of the present application.

10: Array antenna

102: Sub-antenna

12: Phase shifter

14: filter

16: Signal Transceiver Amplifier

162: receiving amplifier

164: Transmit amplifier

18: Inverter

20: Combiner

22: IF filter

Claims (8)

A wireless communication receiving system includes: Array antenna, including multiple sub-antennas; A plurality of phase shifters are respectively connected to each of the sub-antennas, and the phase shifters select and receive the frequency bands of the correspondingly connected sub-antennas; A plurality of filters are respectively connected to each of the phase shifters, and the filters are to shield the signals of the antenna frequency band that the sub-antenna should not receive; A plurality of signal transceiver amplifiers are respectively connected to each of the filters, and the signal transceiver amplifiers amplify the signal; A plurality of frequency converters are respectively connected to each of the signal transceiver amplifiers, and the frequency converters selectively convert at least one of the filtered and amplified signals to a designated frequency range; and The combiner is connected to the inverters, and the combiner combines the output signals of the inverters into a combined signal. The wireless communication receiving system according to claim 1, wherein the signal transceiver amplifier further includes a receiving amplifier and a transmitting amplifier, and the transmitting amplifier transmits and amplifies the designated frequency band to the corresponding sub-antenna. The wireless communication receiving system according to claim 2, wherein the transmitting amplifier is correspondingly connected to the filters through a divider. According to the wireless communication receiving system described in claim 1, each frequency converter further includes two frequency synthesizers, and the signal is converted to the designated frequency band through two frequency conversions of the two frequency synthesizers. According to the wireless communication receiving system of claim 4, each of the frequency converters further includes an intermediate frequency filter, and the intermediate frequency filter is electrically connected between the two frequency synthesizers. The wireless communication receiving system according to claim 1, wherein the filter is a frequency division duplex module. The wireless communication receiving system according to claim 1, wherein the filter is a time division duplex module. The wireless communication receiving system according to claim 1, wherein the combined signal is processed by a signal processor at the back end to reduce the deterioration of the signal-to-noise ratio, and the signal-to-noise ratio is based on the output signal of the sub-antennas. The noise ratio, the insertion loss of the phase shifters and the total noise coefficient of the filters, the signal transceiver amplifiers, the frequency converters, and the combiner are determined.

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