CN106470179B - Mobile terminal uplink signal generation method and device - Google Patents
Mobile terminal uplink signal generation method and device Download PDFInfo
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- CN106470179B CN106470179B CN201510519634.2A CN201510519634A CN106470179B CN 106470179 B CN106470179 B CN 106470179B CN 201510519634 A CN201510519634 A CN 201510519634A CN 106470179 B CN106470179 B CN 106470179B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
Abstract
A kind of mobile terminal uplink signal generation method and device, which comprises obtain the number of continuous resource blocks to be sent；Output signal after discrete Fourier transform is mapped on N number of subcarrier, N is corresponding with the number of the continuous resource blocks to be sent；The IFFT transformation that N points are carried out to N number of subcarrier, obtains time-domain signal；The time-domain signal is inserted into cyclic prefix；Time-domain signal after insertion cyclic prefix is up-sampled, so that the insertion sample rate sample rate corresponding with the system bandwidth that the mobile terminal is currently configured of time-domain signal of cyclic prefix is equal；Phase rotation will be carried out by the time-domain signal of up-sampling, generates the uplink signal.Using the method and device, IFFT transformation points can be effectively reduced, and then reduce LTE mobile terminal power consumption.
Description
Technical field
The present invention relates to wireless communication field more particularly to a kind of mobile terminal uplink signal generation method and devices.
Background technique
Long term evolution (Long Term Evolution, LTE) is third generation partner program (3rd Generation
Partnership Project, 3GPP) leading Universal Mobile Communication System technology long term evolution, be to be recognized extensively at present
Can wireless communication technique.
In existing LTE system, carrier bandwidths generally include 20MHz, 15MHz, 10MHz, 5MHz, 3MHz and 1.4MHz
Deng.In existing communication agreement, there are corresponding Fast Fourier Transform (FFT) (Inverse Fast for different carrier bandwidths
Fourier Transform, IFFT) points, for example, corresponding IFFT point number is 2048 when carrier bandwidths are 20MHz, carrier band
Corresponding IFFT point number is 1024 when width is 10MHz.
When LTE system band width configuration is big broadband scene, need to be counted greatly in uplink signal generating process
IFFT transformation.For example, LTE system band width configuration is that 20MHz needs to carry out at 2048 points then in uplink signal generating process
IFFT transformation.However, it is larger that the IFFT transformation counted greatly will lead to mobile terminal power consumption in some scenes.
Summary of the invention
What the embodiment of the present invention solved is how to reduce IFFT to convert the problem for causing mobile terminal power consumption larger.
To solve the above problems, the embodiment of the present invention provides a kind of mobile terminal uplink signal generation method, comprising:
Obtain the number of continuous resource blocks to be sent；
Output signal after discrete Fourier transform is mapped on N number of subcarrier, N with it is described to be sent continuous
The number of resource block is corresponding；
The IFFT transformation that N points are carried out to N number of subcarrier, obtains time-domain signal；
The time-domain signal is inserted into cyclic prefix；
Time-domain signal after insertion cyclic prefix is up-sampled, so that the time-domain signal of the insertion cyclic prefix
Sample rate sample rate corresponding with the system bandwidth that the mobile terminal is currently configured is equal；
Phase rotation will be carried out by the time-domain signal of up-sampling, generates the uplink signal.
Optionally, the length of the cyclic prefix and N are corresponded.
Optionally, the length of the cyclic prefix are as follows: CP0/ (M/N), wherein M is the current-configuration of the mobile terminal
System bandwidth corresponding IFFT transformation points, CP0For the length of the corresponding cyclic prefix of M.
Optionally, the time-domain signal after described pair of insertion cyclic prefix up-samples, comprising: after insertion cyclic prefix
Time-domain signal carry out M/N times of up-sampling.
Optionally, described to carry out phase rotation by the time-domain signal of up-sampling, generate the uplink signal, comprising:
It detects when the output signal after discrete Fourier transform to be mapped on N number of subcarrier, if having not been obtained described continuous
The frequency domain initial position of resource block, by it is described by up-sampling time-domain signal withIt is multiplied, to phase
Time-domain signal after multiplying carries out phase rotation to generate the uplink signal；Wherein:For in the continuous resource blocks
The frequency domain initial position of first resource block,For the corresponding variable number of each resource block.
The embodiment of the invention also provides a kind of mobile terminal uplink signal generating means, comprising:
Acquiring unit, for obtaining the number of continuous resource blocks to be sent；
Map unit, for the output signal after discrete Fourier transform to be mapped to N number of subcarrier, N and institute
The number for stating continuous resource blocks to be sent is corresponding；
IFFT converter unit, the IFFT for carrying out N points to N number of subcarrier are converted, and obtain time-domain signal；
Cyclic prefix is inserted into unit, for the time-domain signal to be inserted into cyclic prefix；
Up-sampling unit is up-sampled for the signal that is suitable for insertion cyclic prefix, so that before insertion circulation
The sample rate for the time-domain signal sewed sample rate corresponding with the system bandwidth that the mobile terminal is currently configured is equal；
Phase rotation units, the time-domain signal suitable for that will pass through up-sampling carry out phase rotation, generate the uplink signal.
Optionally, the length of the cyclic prefix of the cyclic prefix insertion unit insertion and N are corresponded.
Optionally, the length of the cyclic prefix of the cyclic prefix insertion unit insertion are as follows: CP0/ (M/N), wherein M is
The corresponding IFFT transformation points of the system bandwidth of the current-configuration of the mobile terminal, CP0For the length of the corresponding cyclic prefix of M
Degree.
Optionally, the up-sampling unit is suitable for carrying out the time-domain signal after insertion cyclic prefix M/N times of up-sampling.
Optionally, the phase rotation units, suitable for when detecting and will believe by the output after discrete Fourier transform
When number being mapped on N number of subcarrier, if the frequency domain initial position of the continuous resource blocks has not been obtained, by described by up-sampling
Time-domain signal withIt is multiplied, it is described to generate to carry out phase rotation to the time-domain signal after multiplication
Uplink signal；Wherein:For the frequency domain initial position of first resource block in the continuous resource blocks,For each resource
The corresponding variable number of block.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantage that
It is not the IFFT transformation that the bandwidth being currently configured according to system is accordingly counted when carrying out IFFT transformation,
But corresponding IFFT transformation points are selected according to the number of continuous resource blocks.When the number of continuous resource blocks is less, choosing
The IFFT transformation points selected are less, so as to the problem for avoiding the IFFT point number because of configuration from excessively causing power consumption of terminal larger.
Detailed description of the invention
Fig. 1 is the flow chart of one of embodiment of the present invention mobile terminal uplink signal generation method；
Fig. 2 is the structural schematic diagram of one of embodiment of the present invention mobile terminal uplink signal generating means.
Specific embodiment
In the prior art, according to current communication protocol, the bandwidth of LTE system configuration is related to IFFT point number.Work as LTE
When system bandwidth is configured to big broadband scene, the corresponding IFFT transformation counted greatly is carried out in uplink signal generating process.For example,
LTE system band width configuration is 20MHz, then in uplink signal generating process, needs to carry out 2048 points of IFFT transformation.However,
When LTE system band width configuration is 20MHz, it may appear that only configure a small amount of frequency domain resource to Physical Uplink Shared Channel
The case where (Physical Uplink Shared Channel, PUSCH), and Physical Uplink Control Channel (Physical
Uplink Control Channel, PUCCH) each time-domain symbol only distributes a resource block (Resource Block, RB).
In this case, since LTE system band width configuration is 20MHz, there is still a need for the IFFT changes for carrying out at 2048 points
It changes.IFFT transformation is one of biggish process of expense in uplink signal generating process, and the points of IFFT transformation are bigger, corresponding to open
It sells bigger.Therefore, in the prior art, in the generating process of uplink signal, there is a situation where that power consumption of terminal is larger.
It in embodiments of the present invention, is not that phase is carried out according to the bandwidth that system is currently configured when carrying out IFFT transformation
The IFFT transformation that should be counted, but corresponding IFFT transformation points are selected according to the number of continuous resource blocks.Work as continuous resource
When the number of block is less, the IFFT transformation points of selection are less, so as to avoid the IFFT point number because of configuration from excessively leading to end
The problem for holding power consumption larger.
It is understandable to enable the above objects, features, and advantages of the embodiment of the present invention to become apparent, it is right with reference to the accompanying drawing
Specific embodiments of the present invention are described in detail.
The embodiment of the invention provides a kind of mobile terminal uplink signal generation methods, referring to Fig.1, below by way of specific step
Suddenly it is described in detail.
Step S101 obtains the number of continuous resource blocks to be sent.
In practical applications, LTE uplink multi-address access uses single-carrier frequency division multiple access (Single-Carrier
Frequency Division Multiple Access, SC-FDMA) scheme.SC-FDMA symbol can be generated from time domain,
It can be generated from frequency domain.Although from time domain generate SC-FDMA symbol and from frequency domain generate SC-FDMA symbol it is equivalent from effect,
But the bandwidth efficiency that in practical applications, time domain generates is lower than the bandwidth that frequency domain generates.
When generating SC-FDMA signal from frequency domain, serial to parallel conversion is carried out to the bit stream in continuous resource blocks first, it will be through
The bit stream of serial to parallel conversion is crossed after constellation mapping, carries out discrete Fourier transform (the Discrete Fourier of M point
Transform, DFT).Therefore, in embodiments of the present invention, during generating uplink signal, carry out DFT transform it
Before, it can first obtain the number of continuous resource blocks to be sent, the i.e. number of the continuous resource blocks of uplink.
Output signal after discrete Fourier transform is mapped on N number of subcarrier by step S102.
In specific implementation, when the bit data in continuous resource blocks is after DFT transform, the output of DFT can be believed
Number benefit 0 is carried out, so that DFT size and the OFDM symbol modulator of N number of subcarrier match, thus will be by the defeated of DFT transform
Signal is mapped on N number of subcarrier out.
In embodiments of the present invention, N is related to the number X of continuous resource blocks to be sent, and with current system configuration band
Width is unrelated.The mapping table of N Yu continuous resource blocks number X to be sent can be preset.Since each continuous resource blocks are corresponding
12 subcarriers, therefore 12 × X of N >.In the prior art, it is for convenient for hardware realization, IFFT transformation is counted under normal conditions
2n, n is integer.Therefore, N can be the smallest by 2 greater than 12 × XnValue.
In an embodiment of the present invention, when the number of continuous resource blocks is less than or equal to 6,6 × 12=72 of N=128 >.When
When the number of continuous resource blocks is in 6~10, N=256.And in the prior art, when LTE system band width configuration is 20MHz,
Even if the number of continuous resource blocks is 6, corresponding IFFT transformation points are still 2048.
Step S103, the IFFT for carrying out N points to N number of subcarrier are converted, and obtain time-domain signal.
In specific implementation, after DFT output signal is mapped on N number of subcarrier, obtained signal is frequency-region signal.
After converting IFFT of the frequency-region signal by N points, time-domain signal is obtained, step S104 is executed.
The time-domain signal is inserted into cyclic prefix by step S104.
In practical applications, the length of the cyclic prefix of the front end insertion of time-domain signal is 160 or 144.And in the present invention
In embodiment, the length and N of cyclic prefix are corresponded.
It in an embodiment of the present invention, is CP in the length of the cyclic prefix of time-domain signal front end insertion0/ (M/N),
In, M is the corresponding IFFT transformation points of system bandwidth of the current-configuration of the mobile terminal, CP0For the corresponding cyclic prefix of M
Length.
For example, N=128.The system bandwidth that LTE is currently configured is 20MHz, then corresponding IFFT transformation points are M=
2048, when the length of the corresponding cyclic prefix of M is 160, the length of the corresponding cyclic prefix of N is CP0/ (M/N)=160/
(2048/128)=10.When the length of the corresponding cyclic prefix of M is 144, the length of the corresponding cyclic prefix of N is CP0/(M/
N)=144/ (2048/128)=8.
For another example, the system bandwidth that N=128, LTE are currently configured is 10MHz, then corresponding IFFT transformation points are M=
1024, when the length of the corresponding cyclic prefix of M is 160, the length of the corresponding cyclic prefix of N is CP0/ (M/N)=160/
(1024/128)=20.
Step S105 up-samples the time-domain signal after insertion cyclic prefix.
In specific implementation, as N=128, corresponding sample rate is 1.92MHz.It is configured corresponding to different LTE systems
Bandwidth, there are corresponding sample rates.Therefore, the time-domain signal after insertion cyclic prefix can be up-sampled, with
So that the sample rate phase corresponding with the system bandwidth that LTE system is currently configured of the sample rate suitable for signal of insertion cyclic prefix
Deng.
In practical applications, when the system bandwidth that LTE system is currently configured is 20MHz, corresponding sample rate is
30.72MHz；When the system bandwidth that LTE system is currently configured is 10MHz, corresponding sample rate is 15.36MHz；LTE system
When the system bandwidth of current-configuration is 5MHz, corresponding sample rate is 7.68MHz；LTE system be currently configured system bandwidth be
When 3MHz, corresponding sample rate is 3.84MHz.
When due to N=128, corresponding sample rate is 1.92MHz, therefore, to make the time domain letter after insertion cyclic prefix
Number adapt to LTE system configuration bandwidth, can to insertion cyclic prefix time-domain signal carry out up-sampling operation.
In an embodiment of the present invention, when LTE system configured bandwidth is 20MHz, the time domain of insertion cyclic prefix is believed
Number carry out 2048/128=16 times up-sampling operate；When LTE system configured bandwidth is 10MHz, to insertion cyclic prefix
Time-domain signal carries out 1024/128=8 times of up-sampling operation；When LTE system configured bandwidth is 5MHz, to insertion cyclic prefix
Time-domain signal carry out 512/128=4 times up-sampling operate；When LTE system configured bandwidth is 3MHz, to insertion cyclic prefix
Time-domain signal carry out 256/128=2 times up-sampling operate.
It is suitable for after signal up-samples to after insertion cyclic prefix, step S106 can be executed.
Step S106 will pass through phase rotation by the time-domain signal of up-sampling, generate the uplink signal.
In specific implementation, phase rotation operation can be carried out to by the time-domain signal of up-sampling, by phase rotation
Time-domain signal later is uplink signal.
In embodiments of the present invention, step S102 is being executed, i.e., when carrying out subcarrier maps, if not considering continuous resource
The frequency domain initial position of block, then can will by up-sampling time-domain signal withIt is multiplied, to multiplication
Time-domain signal later carries out phase rotation, generates uplink signal, in which:For first resource in the continuous resource blocks
The frequency domain initial position of block,For the corresponding variable number of each resource block.
In the prior art, the points of IFFT transformation are related to LTE system band width configuration.When LTE system band width configuration is
When 20MHz, no matter the number of the continuous resource blocks of uplink how many, IFFT transformation points be 2048 points.And in the present invention
In embodiment, IFFT transformation points it is related to the number of the continuous resource blocks of uplink, when LTE system band width configuration be 20MHz,
When the number of the continuous resource blocks of uplink is 6, the points of IFFT transformation are only 128 points.
It can be seen that being not that the bandwidth being currently configured according to system is accordingly counted when carrying out IFFT transformation
IFFT transformation, but corresponding IFFT transformation points are selected according to the number of continuous resource blocks.When the number of continuous resource blocks
When less, the IFFT of selection transformation points are less, so as to avoid the IFFT point number because of configuration excessively cause power consumption of terminal compared with
Big problem.
Referring to Fig. 2, the embodiment of the invention provides a kind of mobile terminal uplink signal generating means 20, comprising: obtains single
Member 201, map unit 202, IFFT converter unit 203, cyclic prefix insertion unit 204, up-sampling unit 205 and phase rotation
Turn unit 206, in which:
Acquiring unit 201, for obtaining the number of continuous resource blocks to be sent；
Map unit 202, for the output signal after discrete Fourier transform to be mapped to N number of subcarrier, N with
The number of the continuous resource blocks to be sent is corresponding；
IFFT converter unit 203, the IFFT for carrying out N points to N number of subcarrier are converted, and obtain time-domain signal；
Cyclic prefix is inserted into unit 204, for the time-domain signal to be inserted into cyclic prefix；
Up-sampling unit 205 is up-sampled for the signal that is suitable for insertion cyclic prefix, so that the insertion recycles
The sample rate of the time-domain signal of prefix sample rate corresponding with the system bandwidth that the mobile terminal is currently configured is equal；
Phase rotation units 206, the time-domain signal suitable for that will pass through up-sampling carry out phase rotation, generate the uplink letter
Number.
In specific implementation, the length and N for the cyclic prefix that the cyclic prefix insertion unit 204 is inserted into correspond.
In specific implementation, the length for the cyclic prefix that the cyclic prefix insertion unit 204 is inserted into are as follows: CP0/ (M/N),
Wherein, M is the corresponding IFFT transformation points of system bandwidth of the current-configuration of the mobile terminal, CP0Before the corresponding circulation of M
The length sewed.
In specific implementation, the up-sampling unit 205 is suitable for carrying out M/N times to the time-domain signal after insertion cyclic prefix
Up-sampling.
In specific implementation, the phase rotation units 206, suitable for when detecting will be after discrete Fourier transform
Output signal when being mapped on N number of subcarrier, if the frequency domain initial position of the continuous resource blocks has not been obtained, by the process
The time-domain signal of up-sampling withBe multiplied, to after multiplication time-domain signal carry out phase rotation with
Generate the uplink signal；Wherein:For the frequency domain initial position of first resource block in the continuous resource blocks,For
The corresponding variable number of each resource block.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (6)
1. a kind of mobile terminal uplink signal generation method characterized by comprising
Obtain the number of continuous resource blocks to be sent；
Output signal after discrete Fourier transform is mapped on N number of subcarrier, N and the continuous resource to be sent
The number of block is corresponding；
The IFFT transformation that N points are carried out to N number of subcarrier, obtains time-domain signal；
The time-domain signal is inserted into cyclic prefix；The length and N of the cyclic prefix correspond, and the cyclic prefix
Length are as follows: CP0/ (M/N), wherein M is the corresponding IFFT transformation points of system bandwidth of the current-configuration of the mobile terminal,
CP0For the length of the corresponding cyclic prefix of M；
Time-domain signal after insertion cyclic prefix is up-sampled, so that the sampling of the time-domain signal of the insertion cyclic prefix
Rate sample rate corresponding with the system bandwidth that the mobile terminal is currently configured is equal；
Phase rotation will be carried out by the time-domain signal of up-sampling, generates the uplink signal.
2. mobile terminal uplink signal generation method as described in claim 1, which is characterized in that described pair of insertion cyclic prefix
Time-domain signal afterwards is up-sampled, comprising: M/N times of up-sampling is carried out to the time-domain signal after insertion cyclic prefix.
3. mobile terminal uplink signal generation method as described in claim 1, which is characterized in that described to pass through up-sampling
Time-domain signal carries out phase rotation, generates the uplink signal, comprising:
It detects when the output signal after discrete Fourier transform to be mapped on N number of subcarrier, if having not been obtained described
The frequency domain initial position of continuous resource blocks, by it is described by up-sampling time-domain signal withIt is multiplied,
Phase rotation is carried out to generate the uplink signal to the time-domain signal after multiplication；Wherein:For the continuous resource blocks
In first resource block frequency domain initial position,For the corresponding variable number of each resource block.
4. a kind of mobile terminal uplink signal generating means characterized by comprising
Acquiring unit, for obtaining the number of continuous resource blocks to be sent；
Map unit, for the output signal after discrete Fourier transform to be mapped to N number of subcarrier, N and it is described to
The number of the continuous resource blocks of transmission is corresponding；
IFFT converter unit, the IFFT for carrying out N points to N number of subcarrier are converted, and obtain time-domain signal；
Cyclic prefix is inserted into unit, for the time-domain signal to be inserted into cyclic prefix；The length and N of the cyclic prefix are one by one
It is corresponding, and the length of the cyclic prefix are as follows: CP0/ (M/N), wherein M is the system band of the current-configuration of the mobile terminal
The corresponding IFFT transformation points of width, CP0For the length of the corresponding cyclic prefix of M；
Up-sampling unit is up-sampled for the signal that is suitable for insertion cyclic prefix, so that the insertion cyclic prefix
The sample rate of time-domain signal sample rate corresponding with the system bandwidth that the mobile terminal is currently configured is equal；
Phase rotation units, the time-domain signal suitable for that will pass through up-sampling carry out phase rotation, generate the uplink signal.
5. mobile terminal uplink signal generating means as claimed in claim 4, which is characterized in that the up-sampling unit is suitable for
M/N times of up-sampling is carried out to the time-domain signal after insertion cyclic prefix.
6. mobile terminal uplink signal generating means as claimed in claim 4, which is characterized in that the phase rotation units,
Suitable for when detecting when the output signal after discrete Fourier transform to be mapped on N number of subcarrier, if institute has not been obtained
The frequency domain initial position for stating continuous resource blocks, by it is described by up-sampling time-domain signal withPhase
Multiply, phase rotation is carried out to generate the uplink signal to the time-domain signal after multiplication；Wherein:For the continuous money
The frequency domain initial position of first resource block in source block,For the corresponding variable number of each resource block.
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