CN103813346A - Communication signal transmission method and apparatus, and system - Google Patents

Abstract

The application provides a communication signal transmission method. The method comprises the following steps that: all to-be-modulated signals are obtained; according to a preset modulation signal condition, a modulation signal corresponding to each to-be-modulated signal is determined respectively, wherein the preset modulation signal condition is as follows: an absolute value of a difference of center frequencies of two adjacent modulation signals is less than the half of a bandwidth sum of two modulated signals corresponding to the two adjacent modulation signals; for each to-be-modulated signal, one corresponding modulation signal is used to modulate the to-be-modulated signal so as to obtain all modulated signals; and all the modulated signals are sent. According to the application, with the communication signal transmission method, the bearing capacity of the carrier wave can be increased at a frequency spectrum that is applied in advance, thereby increasing the telephone traffic. In addition, the application also provides a communication signal transmission apparatus and a system.

Description

Communication signal transmission method, device and system

Technical Field

The present invention relates to the field of network communication technologies, and in particular, to a method, an apparatus, and a system for transmitting a communication signal.

Background

In a mobile communication system, a wireless device converts information data to be transmitted into a wireless signal for transmission, for example, a base station forward transmission channel is responsible for converting information data from a network side into a wireless signal and sending the wireless signal to a terminal. The base station forward transmitting channel is composed of a baseband module, a middle radio frequency module, a power amplifier module, a radio frequency front end module and an antenna, and after information data from a device side (such as a base station controller) reaches a base station, the information data sequentially passes through the baseband module, the middle radio frequency module, the power amplifier module, the radio frequency front end module and the antenna, is converted into a wireless signal, and then is sent to a terminal through a pre-applied frequency spectrum.

Taking a CDMA system as an example, in a middle radio frequency module, existing base station radio frequency signals are transmitted according to the requirements of a standard protocol (3 GPP2 protocol), that is, the bandwidth of each frequency point (numbering a carrier spectrum) is 1.23MHz, and the frequency point interval is 41 (41 × 30kHz =1.23 MHz), because the spectrum bandwidth previously applied by a telecommunications operator is limited, the number of carriers that can be carried thereon is also limited, and the number of frequency points that can be planned thereon is also fixed under the condition of fixed bandwidth, and further, the traffic that can be carried thereon is also limited, so as to increase the traffic of a user along with the increase of the traffic, how to increase the traffic in the transmission process of communication signals under the condition of fixed bandwidth becomes an urgent problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a communication signal transmission method, a communication signal transmission device and a communication signal transmission system, which aim to solve the problem of increasing telephone traffic under the condition of fixed bandwidth.

A first aspect of the present invention provides a communication signal transmission method, including:

acquiring each signal to be modulated;

respectively determining a modulation signal corresponding to each signal to be modulated according to preset modulation signal conditions, wherein the preset modulation signal conditions are that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the two modulation signals corresponding to the two adjacent modulation signals;

for each signal to be modulated, modulating the signal by using a modulation signal corresponding to the signal to be modulated to obtain each modulated signal;

and transmitting each modulated signal.

In a first possible implementation manner of the first aspect, the modulating the signal to be modulated by applying a modulation signal corresponding to the signal to be modulated includes:

and modulating the bandwidth of the signal to be modulated to be 2 times of the original bandwidth.

In a second possible implementation manner of the first aspect, after the transmitting each modulated signal, the method further includes:

performing digital/analog conversion on the transmitted modulated signal;

and converting the modulated signal after the digital-to-analog conversion into a radio frequency signal for transmission.

A second aspect of the present invention provides a communication signal transmission apparatus comprising:

an acquisition module, a determination module, a modulation module and a transmission module, wherein,

the acquisition module is used for acquiring each signal to be modulated;

the determining module is used for respectively determining a modulation signal corresponding to each signal to be modulated according to a preset modulation signal condition, wherein the preset modulation signal condition is that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the sum of the bandwidths of the two modulation signals corresponding to the two modulation signals;

the modulation module is used for modulating each signal to be modulated by applying a modulation signal corresponding to each signal to be modulated to obtain each modulated signal;

the transmitting module is configured to transmit each of the modulated signals.

In a first possible implementation manner of the second aspect, the modulation module is configured to modulate a bandwidth of the signal to be modulated to be 2 times larger than an original bandwidth.

In a second possible implementation manner of the second aspect, the method further includes:

a digital/analog converter for performing digital/analog conversion on the transmitted modulated signal;

and the radio frequency conversion module is used for converting the modulated signal after the digital/analog conversion into a radio frequency signal to be sent.

A third aspect of the present invention provides a communication signal transmission apparatus comprising:

at least one processor configured to:

acquiring each signal to be modulated;

respectively determining a modulation signal corresponding to each signal to be modulated according to preset modulation signal conditions, wherein the preset modulation signal conditions are that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the two modulation signals corresponding to the two adjacent modulation signals;

for each signal to be modulated, modulating the signal by using a modulation signal corresponding to the signal to be modulated to obtain each modulated signal;

transmitting each of the modulated signals;

a memory coupled with the at least one processor.

A fourth aspect of the present invention provides a communication system comprising the communication signal transmission apparatus as described above.

In the method, the device and the system for transmitting the communication signals, when the signals to be modulated are modulated, the absolute value of the difference between the center frequencies of two adjacent modulation signals is smaller than half of the sum of the bandwidths of the two modulation signals corresponding to the two adjacent modulation signals, so that when the modulation signals are combined into one signal for transmission, a certain frequency spectrum overlap exists between the two adjacent modulation signals, the total bandwidth occupied by each modulation signal is reduced, and further, under the condition of fixed bandwidth, the carrying capacity of a carrier wave can be increased on the frequency spectrum applied in advance, so that the traffic is increased.

Drawings

Fig. 1 is a flowchart of a communication signal transmission method according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a communication signal transmission apparatus according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another communication signal transmission apparatus according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of another communication signal transmission apparatus according to an embodiment of the present application;

fig. 5 is a schematic distribution diagram of frequency points that can be carried over a fixed bandwidth in the prior art;

fig. 6 is a schematic distribution diagram of frequency points that can be carried over a fixed bandwidth according to an embodiment of the present application.

Detailed Description

So that those skilled in the art can further understand the features and technical content of the present invention, reference is made to the following detailed description of the present invention and accompanying drawings, which are provided for reference and illustration only and are not intended to limit the present invention.

Referring to fig. 1, fig. 1 is a flowchart of a communication signal transmission method according to an embodiment of the present application, including:

step S101: acquiring each signal to be modulated;

step S102: respectively determining a modulation signal corresponding to each signal to be modulated according to preset modulation signal conditions, wherein the preset modulation signal conditions are that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the two modulation signals corresponding to the two adjacent modulation signals;

different from the prior art, in the prior art, when the modulated signals are combined into one signal for transmission, there is no spectrum overlap between two adjacent modulated signals, that is, an absolute value of a difference between center frequencies of two adjacent modulated signals is equal to a half of a sum of bandwidths of two modulated signals corresponding to the two adjacent modulated signals.

The adjacent modulated signals may be defined by: and arranging the central frequency values of the modulation signals in an ascending order or a descending order, so that the two modulation signals corresponding to the two adjacent central frequency values are the two adjacent modulation signals.

For example, it is assumed here that there are three (two or more may also be) signals to be modulated BS1, BS2, BS 3; the modulation signals respectively corresponding to the three paths of signals to be modulated are respectively MS1, MS2 and MS3, namely MS1 corresponds to BS1, MS2 corresponds to BS2, and MS3 corresponds to BS3, wherein the center frequency of a modulation signal MS1 is F1, the center frequency of a modulation signal MS2 is F2, and the center frequency of a modulation signal MS3 is F3; assuming that three modulation signals are adjacent in sequence, namely the modulation signal MS1 is adjacent to the modulation signal MS2, and the modulation signal MS2 is adjacent to both the modulation signal MS1 and the modulation signal MS 3; the modulated signals respectively corresponding to the three paths of modulation signals are YS1, YS2 and YS3 respectively, that is, the modulation signal MS1 modulates the signal to be modulated BS1 to obtain a modulated signal YS1 with a bandwidth of a, the modulation signal MS2 modulates the signal to be modulated BS2 to obtain a modulated signal YS2 with a bandwidth of B, the modulation signal M32 modulates the signal to be modulated BS3 to obtain a modulated signal YS3 with a bandwidth of C,

in the prior art, the center frequencies of two adjacent modulation signals MS1 and MS2 satisfy the following relationship:

$|F2-F1|=\frac{A+B}{2}---\left(1\right)$

the center frequencies of two adjacent modulation signals MS2 and MS3 satisfy the following relation:

$|F3-F2|=\frac{B+C}{2}---\left(2\right)$

i.e. the absolute value of the difference between the center frequencies of two adjacent modulated signals is equal to half the sum of the bandwidths of the two modulated signals corresponding to said two adjacent modulated signals.

In the scheme, the center frequencies of two adjacent modulation signals MS1 and MS2 satisfy the following modulation signal conditions:

$|F2-F1|<\frac{A+B}{2}---\left(3\right)$

the frequencies of two adjacent modulation signals MS2 and MS3 satisfy the following modulation signal conditions:

$|F3-F2|<\frac{B+C}{2}---\left(4\right)$

i.e. the absolute value of the difference between the center frequencies of two adjacent modulation signals is less than half the sum of the bandwidths of the two modulation signals corresponding to said two adjacent modulation signals.

Step S103: for each signal to be modulated, modulating the signal by using a modulation signal corresponding to the signal to be modulated to obtain each modulated signal;

step S104: and transmitting each modulated signal.

When transmitting the modulated signals, the modulated signals may be transmitted separately; or combining each modulated signal into a path of signal to be transmitted; of course, part of the modulated signals may also be combined into one path of signal to be transmitted, and the rest of the modulated signals are transmitted respectively, and the specific selection of which method to transmit may be selected according to actual needs, which is not specifically limited herein.

Because the center frequency of each modulated signal is the center frequency of the corresponding modulated signal, and the absolute value of the difference between the center frequencies of two adjacent modulated signals is less than half of the bandwidth sum of the two adjacent modulated signals, when the modulated signals are combined into one signal for transmission, a certain frequency spectrum overlap exists between the two adjacent modulated signals.

According to the communication signal transmission method provided by the embodiment of the application, when a signal to be modulated is modulated, the adopted modulation signal meets the following modulation signal conditions: the absolute value of the difference between the center frequencies of two adjacent modulated signals is less than half of the bandwidth sum of the modulated signals corresponding to the two adjacent modulated signals, when each modulated signal is combined into one path of signal to be transmitted, a certain frequency spectrum overlap exists between the two adjacent modulated signals, so that the total bandwidth occupied by each modulated signal is reduced, and further, under the condition that the bandwidth is fixed, the carrying capacity of a carrier can be increased on the frequency spectrum applied in advance, and the telephone traffic is increased.

In the above embodiment, when modulating the signal to be modulated, the bandwidth of the signal to be modulated may be modulated to be 2 times of the original bandwidth, that is, the bandwidth of the modulated signal is 2 times of the bandwidth of the signal to be modulated.

In the above embodiment, after transmitting each modulated signal, the method may further include:

performing digital/analog conversion on the transmitted modulated signal;

and converting the modulated signal after the digital-to-analog conversion into a radio frequency signal for transmission.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a communication signal transmission apparatus according to an embodiment of the present application, including:

an acquisition module 201, a determination module 202, a modulation module 203 and a sending module 204; wherein,

the obtaining module 201 is configured to obtain each signal to be modulated.

The determining module 202 is configured to determine, according to a preset modulation signal condition, a modulation signal corresponding to each signal to be modulated, where the preset modulation signal condition is that an absolute value of a difference between center frequencies of two adjacent modulation signals is smaller than a half of a sum of bandwidths of the two modulation signals corresponding to the two modulation signals;

the modulation module 203 is configured to modulate each to-be-modulated signal with a modulation signal corresponding to each to-be-modulated signal to obtain each modulated signal; preferably, the modulation module 203 can modulate the bandwidth of each signal to be modulated to 2 times the original bandwidth.

The transmitting module 204 is configured to transmit the respective modulated signals.

According to the communication signal transmission device provided by the embodiment of the application, when a signal to be modulated is modulated, the adopted modulation signal meets the following modulation conditions: the absolute value of the difference between the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the modulation signals corresponding to the two adjacent modulation signals, when the modulation signals are combined into one path of signal for transmission, a certain frequency spectrum overlap exists between the two adjacent modulation signals, so that the total bandwidth occupied by each modulation signal is reduced, and further, under the condition that the bandwidth is fixed, the carrying capacity of a carrier can be increased on the frequency spectrum applied in advance, and the telephone traffic is increased.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another communication signal transmission apparatus according to an embodiment of the present application, and based on the embodiment shown in fig. 2, the communication signal transmission apparatus according to the embodiment of the present application further includes:

a digital/analog converter 301, and a converter module 302; wherein,

the digital/analog converter 301 is used for performing digital/analog conversion on the transmitted modulated signal;

the rf converter module 302 is configured to convert the digital/analog converted modulated signal into an rf signal for transmission.

Please refer to fig. 4, which is a schematic structural diagram of another communication signal transmission apparatus provided in an embodiment of the present application, including:

at least one processor and a memory coupled with the at least one processor;

the at least one processor may be configured to:

acquiring each signal to be modulated;

respectively determining a modulation signal corresponding to each signal to be modulated according to preset modulation signal conditions, wherein the preset modulation signal conditions are that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the two modulation signals corresponding to the two adjacent modulation signals;

for each signal to be modulated, modulating the signal by using a modulation signal corresponding to the signal to be modulated to obtain each modulated signal;

and transmitting each modulated signal.

Specifically, the method disclosed in the above embodiments of the present invention may be applied to the first processor 401, or implemented by the first processor 401. The first processor 401 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware or instructions in the form of software in the first processor 401. These instructions may be implemented and controlled by the second processor 402. For performing the methods disclosed in the embodiments of the present invention, the processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor, decoder, etc. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the field, such as a Random Access Memory (RAM), a Flash Memory, a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an electrically erasable and programmable Memory (EEPROM), a register, and the like. The storage medium is located in the memory 403, and the processor reads the information in the memory 403 and completes the steps of the method in combination with the hardware.

In a communication system disclosed in the present application, the communication signal transmission device is the communication signal transmission device disclosed in the above embodiments, and the communication system provided in the present application has the communication signal transmission device disclosed in the above embodiments, so that the communication system disclosed in the present application has the technical effects of the above communication signal transmission device, and details are not repeated herein.

The following describes the present application in detail by taking a CDMA system as an example:

fig. 5 is a schematic diagram illustrating a distribution of frequency points that can be carried over a fixed bandwidth (5M bandwidth) in the prior art.

In a CDMA system, base station radio frequency signals are transmitted to a terminal according to a standard protocol (3 GPP2 protocol), that is, a bandwidth of each frequency point is 1.23MHz, and a frequency point interval is 41 (41 × 30kHz =1.23 MHz), for example, in a CDMA 800M system, there is only a 5M bandwidth, and according to the standard protocol requirement, the 5M bandwidth can only carry 3 available frequency points (a guard band of 625kHz needs to be reserved at both ends of a high-frequency band and a low-frequency band), which are 1019/37/78 three frequency points respectively.

Fig. 6 is a schematic diagram illustrating a distribution of frequency points that can be carried over a fixed bandwidth (5M bandwidth) according to an embodiment of the present application;

in order to distinguish between frequency points 991 and 1019, in the present embodiment, the dotted line represents frequency point 991, and the solid line represents frequency point 1019;

to expand the capacity of the frequency point, that is, more frequency points can be carried on a 5M bandwidth, as can be known from a CDMA frequency point distribution table in a 3GPP2 protocol, a 991 frequency point is available below a 1019 frequency point, that is, the 991 frequency point can be increased on the 5M bandwidth, according to the scheme, the 991 frequency point can be increased according to the following method:

when the signal to be modulated corresponding to the frequency point 991 is modulated, the absolute value of the difference between the central frequency f1 of the modulation signal corresponding to the frequency point 991 and the central frequency f2 of the modulation signal corresponding to the frequency point 1019 is less than half of the sum of the bandwidths of the modulated signals corresponding to the two frequency points, that is, the sum of the bandwidths of the modulated signals corresponding to the two frequency points is half

|f1-f2|<1.23MHz；

In the embodiment of the application, since 1019/37/78 frequency points are planned according to a standard protocol, only the 991 frequency point and the 1019 frequency point have frequency spectrum overlap, the center frequency f1=869.04MHz of the 991 frequency point, and the center frequency of the 1019 frequency point is f2=869.88MHz, therefore, in this embodiment, when combining four channels of signals into one channel of signal for transmission, the frequency spectrums of the 991 frequency point and the 1019 frequency point overlap 390kHz, if the base station device supports output of the frequency spectrum overlap signal, the 991 frequency point can be adopted for capacity expansion, as can be seen from the following actual test data table (table 1), after increasing the 991 carrier wave, under the condition that the forward power and the reverse RSSI are basically the same, the number of users who access is increased by 50%, and capacity expansion is achieved, that is, the purpose of increasing the traffic volume is achieved.

TABLE 1 CDMA 1019&991 frequency point test data after capacity expansion

Wherein, rssi (received Signal Strength indicator) is an indication of the Strength of the terminal Signal received by the base station.

Terminal Tx refers to terminal transmit power;

when the overlapping parts of the adjacent carriers are more, the mutual interference between the two carriers can be reduced by using a filtering equalization technology.

In this embodiment, only two frequency points 991 and 1019 are subjected to spectrum overlapping, and certainly, in order to increase more frequency points on a fixed bandwidth, more adjacent two frequency points may also be subjected to spectrum overlapping when planning frequency points, and for the adjacent two frequency points, the spectrum overlapping portion is not limited to 390kHz, and may also be other values, as shown in the following table (table 2), a comparison table of a partial relationship between capacity and overlapping amount is listed:

TABLE 2

The overlapping frequency is the frequency spectrum overlapping amount of two adjacent frequency points;

the capacity of a single frequency point is the capacity of each frequency point after two adjacent frequency points are overlapped, and the capacity refers to the ratio of the capacity of a single frequency point when frequency spectrums are overlapped to the capacity of a single frequency point when the frequency spectrums are not overlapped.

The relative capacity of the two frequency points is the total capacity of the two frequency points after the two adjacent frequency points are overlapped.

It can be seen that, although the capacity of each frequency point is reduced after two frequency points are overlapped, the total capacity is increased compared to the case without the overlapping of the frequency points because the number of frequency points is increased due to the overlapping of the frequency spectrums.

That is to say, when the frequency points are planned on the rest of spectrum resources or on brand new spectrum resources on the spectrum resources on which part of the frequency points are planned or the frequency points are not planned, spectrum overlapping can be caused between any two adjacent frequency points according to the scheme, and then the carrying capacity of the frequency resources is increased.

By applying the communication signal transmission method provided by the embodiment of the application, the carrier bearing capacity is increased, the compatibility of the terminal at the frequency point is not influenced, and the KPI (key performance indicator) at the network side is not influenced basically.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Therefore, the above-mentioned embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (8)

1. A method for communication signal transmission, comprising:

acquiring each signal to be modulated;

respectively determining a modulation signal corresponding to each signal to be modulated according to preset modulation signal conditions, wherein the preset modulation signal conditions are that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the two modulation signals corresponding to the two adjacent modulation signals;

for each signal to be modulated, modulating the signal by using a modulation signal corresponding to the signal to be modulated to obtain each modulated signal;

and transmitting each modulated signal.

2. The method of claim 1, wherein the applying a modulation signal corresponding to the signal to be modulated to modulate the signal comprises:

and modulating the bandwidth of the signal to be modulated to be 2 times of the original bandwidth.

3. The method of claim 1 or 2, wherein transmitting the respective modulated signals further comprises:

performing digital/analog conversion on the transmitted modulated signal;

and converting the modulated signal after the digital-to-analog conversion into a radio frequency signal for transmission.

4. A communication signal transmission apparatus, comprising:

an acquisition module, a determination module, a modulation module and a transmission module, wherein,

the acquisition module is used for acquiring each signal to be modulated;

the determining module is used for respectively determining a modulation signal corresponding to each signal to be modulated according to a preset modulation signal condition, wherein the preset modulation signal condition is that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the sum of the bandwidths of the two modulation signals corresponding to the two modulation signals;

the modulation module is used for modulating each signal to be modulated by applying a modulation signal corresponding to each signal to be modulated to obtain each modulated signal;

the transmitting module is configured to transmit each of the modulated signals.

5. The apparatus of claim 4, wherein the modulation module is configured to modulate the bandwidth of the signal to be modulated to be 2 times larger than the original bandwidth.

6. The apparatus of claim 4 or 5, further comprising:

a digital/analog converter for performing digital/analog conversion on the transmitted modulated signal;

and the radio frequency conversion module is used for converting the modulated signals subjected to the digital/analog conversion into radio frequency signals to be transmitted.

7. A communication system comprising a communication signal transmission apparatus according to any one of claims 4 to 6.

8. A communication signal transmission apparatus, comprising:

at least one processor configured to:

acquiring each signal to be modulated;

respectively determining a modulation signal corresponding to each signal to be modulated according to preset modulation signal conditions, wherein the preset modulation signal conditions are that the absolute value of the difference of the center frequencies of two adjacent modulation signals is less than half of the bandwidth sum of the two modulation signals corresponding to the two adjacent modulation signals;

for each signal to be modulated, modulating the signal by using a modulation signal corresponding to the signal to be modulated to obtain each modulated signal;

transmitting each of the modulated signals;

a memory coupled with the at least one processor.

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