CN1992696A - Multi-user signal receiving method in multi-carrier wireless communication system - Google Patents
Multi-user signal receiving method in multi-carrier wireless communication system Download PDFInfo
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Abstract
The invention provides a multi-user signal receiving method in the multi-carrier wireless communication system, in which the sub-carrier of the said system is divided into sub-bands along the frequency axis, and each sub-band comprises at least one sub-carrier sequential along the frequency axis, and the signals of one user terminal are transmitted on at least one said sub-band at the same time, and the sub-bands used by the different user terminals of simultaneous transmitting signals various each other. When receiving the said multi-user signals, it respectively does the demultiplexing process of multi-user signals and the demodulation process of single-user signals, and the demultiplexing process of multi-user signals is completed by a filter group; the demodulation process of single-user signals is completed by a Fourier transform installation. Using the method of the invention, it can enhance the robustness of the time shifting and frequency shifting for the different user signals in the demultiplexing process of multi-user signals, thereby reducing the mutual interference for the different user signals in the said receiving process; and also it has still low implementation complexity in the course of implementation of multi-carrier wireless communications system.
Description
Technical field
The present invention relates to a kind of wireless communication technology, more specifically to the multiple user signals method of reseptance in a kind of multi-carrier wireless communications system.
Background technology
Along with the continuous growth of wireless user terminal quantity, and wireless user terminal constantly increases for the demand of traffic rate, and the capacity of wireless communication system and the frequency efficiency of wireless communication system are the key problem in the wireless communication system evolution process all the time.For this reason, aiming to provide more, the technical solution of spectral efficient and bigger power system capacity is one of research focus of wireless communication technology always.Wherein, multicarrier (Multi-carrier) wireless communication technology is because the extensive concern that its good anti-fading (Fading) performance and high-speed data transmission speed are obtaining people.
In the system that uses the multi-carrier wireless communication technology, as multi-carrier-wave-CDMA (MC-CDMA:Multi-carrier-Code Division Multiple Access) system and OFDM (OFDM:Orthogonal Frequency DivisionMultiplexing) system, in system's available frequencies resource, a plurality of carrier waves have been disposed, each described carrier wave is called as a subcarrier (Sub-carrier), and the signal transmission between transmitting set in the system and wireless receiver is carried out on a plurality of described subcarriers simultaneously.Because in described multi-carrier wireless communications system, system's available frequencies resource is divided into a plurality of narrower frequency cells, signal is parallel transmission on a plurality of narrower frequency cells, can better resist frequency selectivity (Frequency Selective Fading) decline when thereby signal transmits in wireless channel, obtain higher transmission throughput (Throughput).
In multi-carrier wireless communications system, wireless communication resources such as according to the demand of each user terminal signal transmission rate or the requirement of signal transmission quality, described subcarrier should same code channel, time slot or transmitting power equally is assigned with.In Siemens (China) Co Ltd in the number of patent application that State Intellectual Property Office of the People's Republic of China submits to is 200510115002.6 patent application, sub-carrier wave distribution method in a kind of multi-carrier wireless communications system has been proposed: at first, the subcarrier that multi-carrier wireless communications system is had is divided into sub-band along frequency axis, and each sub-band is made up of at least one the described subcarrier that is arranged in order along frequency axis; Then, the wireless channel impulse response power on the described sub-band is measured; At last, be that user terminal in the described system distributes the sub-band for its use by the Control Node in the described system according to the measured value of described wireless channel impulse response power.In described sub-carrier wave distribution method, described sub-band is used as the base unit in the subcarrier allocation process, by the Control Node in the multi-carrier wireless communications system is that user terminal in the system distributes, thereby avoided using the shortcoming of a subcarrier as the sub-carrier wave distribution method of base unit, can reduce the signaling consumption in the subcarrier allocation process; In having the multi-carrier wireless communications system of a large amount of wireless user terminals, provide a kind of multi-user's subcarrier allocation mechanism simultaneously, eliminated the subcarrier request conflict between a plurality of described user terminals.
Use described sub-carrier wave distribution method, be that a user terminal has distributed one or more for behind the sub-band of its transmission signals, generally adopting the method for fast fourier transform (FFT:Fast Fourier Transform) to realize that the multi-carrier signal between described user terminal and its Control Node transmits in the prior art.For example, transmitting terminal at described multi-carrier signal, discrete Fourier transform (DFT) (the DFT:Discrete Fourier Transform) device that uses a Nc to order comes the signal of described user terminal is carried out multi-carrier modulation, and wherein Nc represents the shared number of subcarriers of signal transmission of described user terminal; At the receiving terminal of described multi-carrier signal, anti-discrete Fourier transform (DFT) (the IDFT:Inverse Discrete FourierTransform) device that uses a Nc to order comes the multi-carrier signal of described user terminal is carried out demodulation.Use described multi-carrier signal transmission method, the modulation and demodulation process of signal all can use the method for Digital Signal Processing to be realized, thereby can simplify the implementation process of multi-carrier wireless communications system, reduces system cost.
When in a multi-carrier wireless communications system that has a plurality of user terminals, using described multi-carrier signal transmission method, described Fourier transform device will not only need to finish the modulation and demodulation process of signal, also need to finish multiplexing (Multiplex) and demultiplexing (De-multiplex) process of multiple user signals simultaneously.When life period skew between the transmission signal of each user terminal or frequency shift (FS), using described Fourier transform converting means multi-user's received signal to be carried out in the process of demultiplexing, to produce comparatively serious phase mutual interference between the received signal of each user terminal, phase mutual interference between this a plurality of user terminal will be particularly remarkable what showed to the up link of Control Node by user terminal, all can produce very high request to synchronization accuracy between each user terminal and timing accuracy in the system, thereby also limit the application of described multi-carrier signal transmission method in the multi-carrier wireless communications system of multiple users.
Summary of the invention
The object of the present invention is to provide the multiple user signals method of reseptance in a kind of multi-carrier wireless communications system, can be in a multi-carrier wireless communications system that has a plurality of user terminals, the signal of each user terminal effectively carries out demultiplexing to received signal, also can strengthen the robustness (Robustness) of the demultiplexing process of multiple user signals simultaneously, reduce the phase mutual interference between each user terminal received signal for time migration between each subscriber signal and frequency shift (FS); And can make multi-carrier wireless communications system in the process of implementing, still have lower implementation complexity.
Above-mentioned goal of the invention is realized by following technical scheme: the multiple user signals method of reseptance in the multi-carrier wireless communications system, the subcarrier that wherein said system has is divided into sub-band along frequency axis, and each sub-band is made up of at least one the described subcarrier that is arranged in order along frequency axis; In described system, the signal of a user terminal transmits at least one described sub-band simultaneously, and the employed sub-band of different user terminals of transmission signals is different simultaneously; Comprise that step is as follows:
(1) use a bank of filters that each subscriber signal in the described multiple user signals is separated;
(2) the single user's multicarrier modulated signal after using a Fourier transform device to described separation carries out demodulation.
In described system, the employed sub-band of user terminal is the adaptive distribution of described user terminal by the Control Node in the described system according to wireless channel state information.Described sub-band further is categorized as the sub-band and protection sub-band of transmission signals, and the sub-band of wherein said transmission signals is used for transmission signals, is that described user terminal distributes by described Control Node; Described protection sub-band is used for forming protection at interval between the sub-band of described transmission signals; There is at least one described protection sub-band between the sub-band of two adjacent described transmission signals.
In described step (1), described bank of filters is made up of at least one band pass filter, and the quantity of described band pass filter equates with the user terminal quantity of while transmission signals; Described bank of filters also can be made up of the frequency shift filter of a prototype filter and described prototype filter, and the quantity of described filter equates with the user terminal quantity of while transmission signals; Described bank of filters also can be made up of a multiphase filter group and a Fourier transform device.
In described step (2), also comprise and use a radio channel estimation device described restituted signal to be carried out the step of channel compensation.
Described multi-carrier wireless communications system is a multi-carrier-wave wireless mobile communication system, and described multiple user signals is the uplink multiuser signal that a cell base station in the described system is received.
Described multi-carrier wireless communications system also can be a multi-carrier-wave wireless LAN system.
Description of drawings
Below will and be described in detail purpose of the present invention and feature in conjunction with the accompanying drawings by specific embodiment, these specific embodiments are illustrative, do not have restricted.
Fig. 1 is the sub-band division schematic diagram in the inventive method.
Fig. 2 is the schematic diagram of step in the inventive method specific embodiment (1).
Fig. 3 is the schematic diagram of step in the inventive method specific embodiment (2).
Embodiment
Fig. 1, Fig. 2 and Fig. 3 have constituted a specific embodiment of the inventive method.
The method according to this invention, in a multi-carrier wireless communications system, the subcarrier that system has will be divided into sub-band, and described sub-band is used as the base unit of subcarrier allocation, is the adaptive distribution of described user terminal by the Control Node in the system according to wireless channel state information, the information such as quality indication of the impulse response performance number that described wireless channel state information can be channel, the Carrier interference ratio of wireless channel or wireless channel.If described multi-carrier wireless communications system is a multi-carrier-wave wireless mobile communication system or multi-carrier-wave wireless LAN system, described system has 2048 subcarriers.Then described 2048 subcarriers are divided into plurality of sub-bands along frequency axis f, each sub-band can comprise a subcarrier, two adjacent subcarriers, perhaps a plurality of subcarriers of arranging along frequency axis.A user terminal can distribute one or more described sub-band for it by described Control Node, and the signal of described user terminal then transmits by described sub-band simultaneously.In order to reduce the phase mutual interference between the signal transmission on the different sub-bands; described sub-band also can further be divided into the sub-band and protection sub-band of transmission signals; the sub-band of wherein said transmission signals is used for transmission signals; described protection sub-band is used for forming protection at interval between the sub-band of described transmission signals, has at least one described protection sub-band between the sub-band of adjacent two described transmission signals.Subcarrier in the described system be divided into behind the sub-band schematic diagram as shown in Figure 1.
When having a plurality of user terminal in the described multi-carrier wireless communications system, the employed sub-band of different user terminals of transmission signals is different simultaneously, and promptly the mode by frequency division multiplexing inserts for different user terminals provides multiple access in described system.Next, the method according to this invention when the transmission signals of described different user terminals arrives receiver one end, comprises that to the method for reseptance of described multiple user signals step is as follows:
(1) use a bank of filters that each subscriber signal in the described multiple user signals is separated;
(2) the single user's multicarrier modulated signal after using a Fourier transform device to described separation carries out demodulation.Promptly in the method for the invention, receiving course to described multiple user signals is broken down into the demultiplexing process of multiple user signals and the demodulating process of single subscriber signal, but not in the prior art with the method for the demodulating process unification of the demultiplexing process of multiple user signals and single subscriber signal.
The demultiplexing process of described multiple user signals is finished by a bank of filters, described bank of filters is made up of at least one band pass filter, the quantity of described band pass filter equates that with the user terminal quantity of while transmission signals the filtering characteristic of each described band pass filter is by the employed sub-band decision of the transmission signals of its relative users terminal.Described band pass filter group can be realized with a plurality of digital filters, but such realization cost is higher relatively; Described band pass filter group also can add frequency translation with a plurality of digital baseband filters and be realized, the filtering characteristic of described a plurality of digital baseband filters is determined by the sub-band division in the described system respectively, the filtering characteristic of a described band pass filter is then by selecting the corresponding digital baseband filter, and realized in conjunction with the digital signal processing of frequency translation, so just can reduce the realization cost of described band pass filter group.Each sub-band in described system is made up of the subcarrier of equal amount, and when simultaneously each user terminal of transmission signals is assigned with sub-band with equal amount in the described system, the employed sub-band of each described user terminal is observed the other side's frequency-shifted version each other from frequency axis, then this moment, described bank of filters can be made up of the frequency-shifted version of a baseband filter and described baseband filter, and described baseband filter can adopt prototype filter (Prototype Filter) to be realized; Perhaps, described bank of filters can more simply adopt a multiphase filter group (Poly-phase Filter Bank) and a Fourier transform device to be realized, as shown in Figure 2: wherein, described multiple user signals will be input to each branch road of described multiphase filter successively by a serial/parallel transducer after arriving receiver one end, the quantity of described branch road equates with the quantity of described user terminal, M represents the quantity of described user terminal, h
m(n), m=1 ..., M represents the phase place output characteristic of each multiphase filter; Then, signal after described multiphase filter group is carried out phse conversion is imported into the Fourier transform device that a M is ordered, and then finish, thereby finish demultiplexing process to described multiple user signals to the low-pass filtering of each subscriber signal and the filtering of frequency translation.
Subsequently, the multi-carrier signal of each user terminal behind the described demultiplexing is carried out demodulation respectively, demodulating process to each described user terminal is finished by a Fourier transform device, and as shown in Figure 3, wherein Nc represents that described user terminal is used for the number of subcarriers of transmission signals.For the intersymbol interference during further erasure signal transmits, when sending, the signal of a user terminal respectively sends under the situation that intersymbol has been filled the circulation prefix, also will correspondingly comprising the step of removal circulation prefix in the demodulating process of described user terminal.In addition, for the influence of the fading characteristic of eliminating wireless channel, in described demodulating process, also can comprise and use a radio channel estimation device described restituted signal to be carried out the step of channel compensation for the signal decision process.
Use method of the present invention, when life period skew between the transmission signal of each user terminal or frequency shift (FS), when described multiple user signals is received, by carrying out respectively to the demodulating process of the demultiplexing process of described multiple user signals and single subscriber signal, can strengthen the robustness of the demultiplexing process of multiple user signals, make that the phase mutual interference between described a plurality of user terminal is effectively suppressed for time migration between each subscriber signal and frequency shift (FS).Especially by user terminal to the up link of Control Node, for example, in the up link of a multi-carrier-wave wireless mobile communication system, use method of the present invention to bring significant system performance gain for described multi-carrier wireless communications system.Simultaneously, method of the present invention still has lower implementation complexity in the process of implementing, thereby makes multi-carrier wireless communications system can have lower realization cost.
Claims (10)
1. the multiple user signals method of reseptance in the multi-carrier wireless communications system, the subcarrier that wherein said system has is divided into sub-band along frequency axis, and each sub-band is made up of at least one the described subcarrier that is arranged in order along frequency axis; In described system, the signal of a user terminal transmits at least one described sub-band simultaneously, and the employed sub-band of different user terminals of transmission signals is different simultaneously; It is characterized in that comprising that step is as follows:
(1) use a bank of filters that each subscriber signal in the described multiple user signals is separated;
(2) the single user's multicarrier modulated signal after using a Fourier transform device to described separation carries out demodulation.
2. the method for claim 1 is characterized in that an employed sub-band of user terminal in the described system is the adaptive distribution of described user terminal by the Control Node in the described system according to wireless channel state information.
3. method as claimed in claim 2, it is characterized in that described sub-band further is categorized as the sub-band and protection sub-band of transmission signals, the sub-band of wherein said transmission signals is used for transmission signals, is that described user terminal distributes by described Control Node; Described protection sub-band is used for forming protection at interval between the sub-band of described transmission signals; There is at least one described protection sub-band between the sub-band of two adjacent described transmission signals.
4. the method for claim 1 is characterized in that described bank of filters is made up of at least one band pass filter in described step (1), and the quantity of described band pass filter equates with the user terminal quantity of while transmission signals.
5. the method for claim 1, it is characterized in that in described step (1), described bank of filters is made up of the frequency shift filter of a prototype filter and described prototype filter, and the quantity of described filter equates with the user terminal quantity of while transmission signals.
6. the method for claim 1 is characterized in that in described step (1), and described bank of filters is made up of a multiphase filter group and a Fourier transform device.
7. the method for claim 1 is characterized in that in described step (2), also comprises using a radio channel estimation device described restituted signal to be carried out the step of channel compensation.
8. the method for claim 1 is characterized in that described multi-carrier wireless communications system is the multi-carrier-wave wireless mobile communication system.
9. method as claimed in claim 8 is characterized in that described multiple user signals is the uplink multiuser signal that a cell base station in the described system is received.
10. the method for claim 1 is characterized in that described multi-carrier wireless communications system is the multi-carrier-wave wireless LAN system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106664267A (en) * | 2014-06-30 | 2017-05-10 | 华为技术有限公司 | Decoding method and device |
| CN110336651A (en) * | 2019-07-05 | 2019-10-15 | 北京神经元网络技术有限公司 | Selection method, device, equipment and the medium of subcarrier |
| CN112543085A (en) * | 2019-09-23 | 2021-03-23 | 北京东土科技股份有限公司 | Method, device, equipment and storage medium for selecting subcarriers for transmission |
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2005
- 2005-12-30 CN CN 200510135522 patent/CN1992696A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106664267A (en) * | 2014-06-30 | 2017-05-10 | 华为技术有限公司 | Decoding method and device |
| CN106664267B (en) * | 2014-06-30 | 2020-07-24 | 华为技术有限公司 | Method and apparatus for decoding |
| CN110336651A (en) * | 2019-07-05 | 2019-10-15 | 北京神经元网络技术有限公司 | Selection method, device, equipment and the medium of subcarrier |
| CN112543085A (en) * | 2019-09-23 | 2021-03-23 | 北京东土科技股份有限公司 | Method, device, equipment and storage medium for selecting subcarriers for transmission |
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