CN112237038B - Signal preprocessing - Google Patents
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- CN112237038B CN112237038B CN201880093995.7A CN201880093995A CN112237038B CN 112237038 B CN112237038 B CN 112237038B CN 201880093995 A CN201880093995 A CN 201880093995A CN 112237038 B CN112237038 B CN 112237038B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/12—Frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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Abstract
Embodiments of the present disclosure relate to a method, a transmitter, and a computer-readable storage medium for signal preprocessing. In an example embodiment, a transmitter generates multiple versions of a signal for transmission over multiple bandwidth portions. The transmitter selects a bandwidth part from the plurality of bandwidth parts and then selects a version from the plurality of versions of the signal to be transmitted on the selected bandwidth part. The transmitter transmits the selected version of the signal over the selected portion of bandwidth. In this way, the time delay between the selection of BWP and the transmission of the signal can be reduced.
Description
Technical Field
Embodiments of the present disclosure relate generally to the field of signal processing, and in particular, to a method, transmitter, and computer-readable storage medium for signal preprocessing.
Background
For New Radios (NRs), it is agreed that the maximum channel bandwidth per NR carrier is up to 400MHz. The bandwidth may be divided into a plurality of bandwidth parts (BWP). A User Equipment (UE) may be configured to operate on one or more (continuous or discontinuous) BWPs. Conventionally, BWP configuration for a UE is not dynamic on the licensed band in NR. For example, a gigabit node B (gNB) may configure uplink BWP and downlink BWP specific to each UE by activating or deactivating BWP with Radio Resource Control (RRC) signaling or Downlink Control Information (DCI). In order to enable switching between different BWP in the licensed band, several time slots are defined for generating the signal to be transmitted.
Unlicensed bands have become a beneficial supplement to licensed bands to meet the ever-increasing service requirements. In the standardization of the European Telecommunications Standards Institute (ETSI) for unlicensed bands, it is proposed to divide the unlicensed band into a plurality of operating channels, and a device may occupy a plurality of continuous/discontinuous operating channels at the same time. For example, unlicensed spectrum 5150MHz to 5350MHz may be divided into 10 operating channels, i.e., 20MHz per channel. Each operating channel may be considered as a large bandwidth BWP of the unlicensed band. By using a single Radio Frequency (RF) transmit (Tx)/receive (Rx) chain that switches between different operating channels, the UE and the gNB can operate on unlicensed bands with large bandwidths.
On unlicensed bands, some operating channels may already be occupied by some devices, while one device cannot occupy the entire unlicensed band. Dynamic BWP adjustments are proposed for unlicensed NRs, taking into account the time-dependent changes in the available operating channels. In dynamic BWP adjustment, a device performs transmission on an idle BWP and automatically discards a busy BWP to improve unlicensed spectrum efficiency. For example, a device may perform a Listen Before Talk (LBT) or Clear Channel Assessment (CCA) procedure to detect idle BWP for transmission.
However, such dynamic BWP adjustment for unlicensed bandwidth requires a high processing performance of the transmitter in terms of processing time, processing speed, etc.
Disclosure of Invention
In general, example embodiments of the present disclosure provide a method, transmitter, and computer-readable storage medium for signal preprocessing.
In a first aspect, a method at a transmitter is provided. Multiple versions of the first signal are generated for transmission over multiple bandwidth portions. A bandwidth portion is selected from the plurality of bandwidth portions and a version of the first signal to be transmitted on the selected bandwidth portion is selected from the plurality of versions of the first signal. The selected version of the first signal is then transmitted over the selected portion of bandwidth.
In a second aspect, a transmitter is provided that includes at least one processor and at least one memory including computer program code. The at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to perform the method according to the first aspect.
In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. The computer program, when executed by a processor, causes the processor to perform the method according to the first aspect.
It should be understood that the summary is not intended to identify key or essential features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
Some example embodiments will now be described with reference to the accompanying drawings, in which:
FIG. 1 illustrates three example cases of dynamic BWP adjustment;
FIG. 2 illustrates an example environment in which embodiments of the present disclosure may be implemented;
fig. 3 illustrates an example arrangement of a transmitter for generating a time-domain baseband version of a first signal according to some embodiments of the disclosure;
fig. 4 illustrates another example arrangement of a transmitter for generating a time-domain baseband version of a first signal according to some other embodiments of the disclosure;
FIG. 5 illustrates an example process implemented at a transmitter in accordance with some embodiments of the present disclosure;
FIG. 6 illustrates a flowchart of an example method according to some embodiments of the present disclosure; and
fig. 7 illustrates a simplified block diagram of an apparatus suitable for implementing embodiments of the present disclosure.
The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements.
Detailed Description
Principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and practicing the present disclosure, and are not intended to suggest any limitation as to the scope of the present disclosure. The disclosure described herein may be implemented in various ways, except as described below.
In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
As used herein, the term "transmitter" refers to a device capable of transmitting a signal. As used herein, the term "receiver" refers to a device capable of receiving a signal. The transmitter or receiver may be implemented by or as part of any suitable device, including for example a network device or a terminal device.
As used herein, the term "network device" refers to any suitable device on the network side of a communication network. The network devices may include any suitable devices in an access network of a communication network, including, for example, base Stations (BSs), relays, access Points (APs), node BS (nodebs or NB), evolved nodebs (eNodeB or eNB), gigabit nodebs (gNB), remote radio modules (RRU), radio Heads (RH), remote Radio Heads (RRH), low power nodes (such as femto nodes, pico nodes), and so forth.
As used herein, the term "terminal device" refers to a device that is capable of being configured, arranged and/or operable to communicate with a network device or another terminal device in a communication network. The communication may involve the transmission and/or reception of wireless signals using electromagnetic signals, radio waves, infrared signals, and/or other types of signals suitable for conveying information over the air. In some embodiments, the terminal device may be configured to transmit and/or receive information without direct human interaction. For example, the terminal device may transmit information to the network device in a predetermined schedule when triggered by an internal or external event, or in response to a request from the network side.
Examples of terminal devices include, but are not limited to, user Equipment (UE), such as a smart phone, a tablet computer with wireless functionality, a laptop embedded device (LEE), a laptop installed device (LME), and/or a wireless Customer Premises Equipment (CPE). For purposes of discussion, some embodiments will be described with reference to a UE as an example of a terminal device, and the terms "terminal device" and "user equipment" (UE) may be used interchangeably in the context of this disclosure.
As used herein, the term "circuitry" may refer to one or more or all of the following:
(a) Hardware-only circuit implementations (such as implementations in analog circuitry and/or digital circuitry only); and
(b) A combination of hardware circuitry and software, such as (as applicable): (i) A combination of analog and/or digital hardware circuit(s) and software/firmware, and (ii) any portion of the hardware processor(s) having software, including digital signal processor(s), software, and memory(s), that operate together to cause a device, such as a mobile phone or server, to perform various functions; and
(c) Hardware circuit(s) and/or processor(s), such as microprocessor(s) or a portion of microprocessor(s), that require software (e.g., firmware) to operate, but may not exist when software is not required to operate.
This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also encompasses an implementation of only a hardware circuit or processor (or processors), or a portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware. For example and where applicable to the elements of the specific claims, the term circuitry also encompasses a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, a cellular network device, or other computing or network device.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprising" and variations thereof are to be interpreted as open-ended terms that mean "including, but not limited to. The term "based on" will be read as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment. The term "another embodiment" will be read as "at least one other embodiment. Other definitions (explicit and implicit) may be included below.
On unlicensed bands, dynamic BWP adjustment is required to allow transmission by multiple devices. For example, a device may detect idle BWP during an LBT or CCA procedure prior to transmission.
Fig. 1 shows three example cases of dynamic BWP adjustment. In these cases (e.g., case 1, case 2, or case 3), four consecutive BWP 105 are configured to one device. In case 1, during the CCA procedure, the device detects that the first BWP 110-1 and the fourth BWP125-1 are blocked due to being occupied by other devices. The second BWP 115-1 and the third BWP 120-1 are detected as clear and available. In this case, the device may transmit using the second BWP 115-1 and the third BWP 120-1.
In case 2, the fourth BWP 125-2 is blocked. The first BWP 110-2, the second BWP 115-2, and the third and BWP 120-2 are clear and available for devices. In case 3, the second BWP 115-3 and the fourth BWP 125-3 are blocked, and the first BWP 110-3 and the third BWP 120-3 are available.
This dynamic BWP adjustment presents a number of challenges. One challenge is for the time to generate the time-domain baseband signal. Conventionally, it is proposed that the time gap between completion of the CCA procedure and transmission does not exceed 16us. In this case, since the BWP which can be used in practice is obtained based on the CCA procedure, it is necessary to generate a time-domain baseband signal to be transmitted on the BWP within 16us. The generation of the time domain baseband signal may include processing of Inverse Fast Fourier Transform (IFFT) and filtering. However, current Digital Signal Processing (DSP) Integrated Circuits (ICs) do not meet the requirements for dynamically generating time-domain baseband signals within 16us.
In Long Term Evolution (LTE) Licensed Assisted Access (LAA), some preamble transmission schemes provide for transmission of the preamble after completion of the CCA procedure. The transmission of the preamble is used to reserve a channel prior to the transmission of the data. However, these schemes do not address the latency problem of signal generation during dynamic BWP adjustment.
Embodiments of the present disclosure provide a signal preprocessing scheme for dynamic BWP adjustment. With this preprocessing scheme, multiple versions of the signal are prepared in advance for transmission over multiple BWPs. Each of these versions corresponds to one of the BWP. After the BWP for transmission is selected, a corresponding version of the signal is selected and then transmitted on the selected BWP. This preparation of multiple versions of the signal significantly reduces the time delay between the selection of BWP and the transmission of the signal.
FIG. 2 illustrates an example environment 200 in which embodiments of the present disclosure may be implemented. Environment 200 includes, as part of a communication network, a transmitter 210 and a receiver 220. It should be understood that one transmitter and one receiver are shown for illustrative purposes only and are not intended to suggest any limitation as to the scope of the disclosure. Environment 200 may include any suitable number of transmitters and receivers suitable for implementing embodiments of the present disclosure.
The transmitter 210 and receiver 220 may be implemented by or as part of any suitable device. In some embodiments, the transmitter 210 may be implemented at a network device and the receiver 220 may be implemented at a terminal device, and vice versa. In embodiments where environment 200 is part of a relay communication network, in this example, transmitter 210 may be implemented at a network device, while receiver 220 may be implemented at a relay, and vice versa. In some other embodiments, both the transmitter 210 and the receiver 220 may be implemented at a terminal device in a device-to-device (D2D) communication, which D2D communication may alternatively be referred to as a side link, or a vehicle-to-vehicle (V2X).
The transmitter 210 may be in communication with a receiver 220. The communication may conform to any suitable communication standard or protocol, such as Universal Mobile Telecommunications System (UMTS), long Term Evolution (LTE), LTE-advanced (LTE-a), fifth generation (5G) NR, wireless fidelity (Wi-Fi), and Worldwide Interoperability for Microwave Access (WiMAX) standards, and employ any suitable communication technology including, for example, multiple Input Multiple Output (MIMO), orthogonal Frequency Division Multiplexing (OFDM), time Division Multiplexing (TDM), frequency Division Multiplexing (FDM), code Division Multiplexing (CDM), bluetooth, zigBee, and Machine Type Communication (MTC), enhanced mobile broadband (eMBB), large scale machine type communication (mctc), and ultra reliable low latency communication (uirllc) technologies.
The transmitter 210 may transmit signals to the receiver 220 over a plurality of BWP configured by a network, for example. BWP may be part of a licensed band or an unlicensed band. For discussion purposes, some embodiments are discussed in the context of unlicensed BWP.
Prior to transmission of the signal (referred to as the first signal), the transmitter 210 generates multiple versions of the first signal for transmission over multiple BWP. In some embodiments, the plurality of versions is a plurality of time domain baseband versions. A plurality of time domain baseband versions may be generated from a plurality of frequency domain baseband versions of the first signal.
Fig. 3 illustrates an example arrangement 300 of a transmitter 210 for generating a time-domain baseband version of a first signal according to some embodiments of the disclosure. In this example, the first signal is a preamble based on a Zadoff-Chu (ZC) sequence, as shown. Other implementations of the first signal are also possible. For example, the first signal may be part of a burst of data.
Arrangement 300 includes a ZC sequence generator 305 for generating ZC sequences based on the root and cyclic shifts. For example, the length of the generated ZC sequence may be 599. The ZC sequence is input into a serial-to-parallel converter 310 for converting the serial input sequence into a parallel output sequence. The parallel sequences are input to a Fast Fourier Transformer (FFT) 315 for Discrete Fourier Transform (DFT) spreading in the frequency domain.
The DFT-spread sequence of the ZC sequence may be mapped to a plurality of BWP to form a plurality of frequency-domain baseband versions of the first signal. In this example, four consecutive BWP (bwp#0, 1, 2, or 3) are configured, and each BWP corresponds to an operation channel of 20MHz with a subcarrier spacing (SCS) of 30 kHz. Arrangement 300 includes four switches 320-1, 320-2, 320-3, and 320-4 for enabling respective BWP #0, 1, 2, and 3 by controlling an input sequence into an Inverse Fast Fourier Transform (IFFT) 325.
For example, to generate versions to be sent on BWP#0 and 1, switches 320-1 and 320-2 for BWP#0 and 1 are opened and switches 320-3 and 320-4 for BWP#2 and 3 are closed. For disabled BWP #2 and 3, the inputs of ifft 325 are fed with zero values. Multiple versions may be generated by combining and repeatedly opening/closing switches for the respective BWP.
The output of the IFFT 325 is input to a parallel to serial converter 330 for converting the parallel sequence to a serial sequence. The output serial sequence of parallel to serial converter 330 is filtered by filter 335 to generate a time domain baseband version of the first signal. In this example, the time domain baseband version occupies one OFDM symbol. The time-domain baseband version may occupy any number of OFDM symbols depending on the width of the subcarriers and BWP.
Fig. 4 illustrates another example arrangement 400 of a transmitter 210 for generating a time-domain baseband version of a first signal according to some other embodiments of the disclosure. In this example, as shown, the first signal is a preamble based on a pseudo-random sequence (e.g., a Gold sequence of length 31).
In arrangement 400, pseudo-random sequence generator 405 generates a pseudo-random sequence after initialization. The pseudo-random sequence is input into a serial-to-parallel converter 410 for converting the serial input sequence into a parallel output sequence. The parallel output sequence is mapped successively to all four consecutive bwp#0, 1, 2 and 3. Then, switches 415-1, 415-2, 415-3, and 415-4 enable the corresponding BWP by puncturing the Resource Elements (REs) of the BWP.
The outputs of switches 415-1, 415-2, 415-3, and 415-4 are coupled to the inputs of IFFT 420. When BWP is off, the output of the switch for BWP is set to zero. The parallel sequence output by IFFT420 is converted to a serial sequence by parallel to serial converter 425 and then the serial sequence is filtered by filter 430 to generate a time-domain baseband version of the first signal, which occupies one OFDM symbol.
In various embodiments of the present disclosure, after the multiple versions of the first signal are generated, the transmitter 210 selects one BWP from the multiple BWPs for transmission. In some embodiments, BWP may be selected by detecting idle BWP from among the plurality of BWP during, for example, a CCA procedure for an unlicensed band.
The version of the first signal corresponding to the selected BWP is selected from the generated versions and then transmitted on the selected BWP. Pre-generating multiple versions of the first signal reduces the time delay between the selection of BWP and the transmission of the first signal.
In some embodiments, multiple versions of the first signal may be prepared only once and reused in subsequent transmissions, regardless of CCA results. In this way, the complexity of the transmitter 210 may be further reduced.
Fig. 5 illustrates an example process 500 implemented at the transmitter 210 according to some embodiments of the disclosure. In this example, four consecutive BWPs 505-1, 505-2, 505-3 and 505-4 are configured. This configuration is known to both the transmitter 210 and the receiver 220.
The transmitter 210 prepares (510) multiple time domain baseband versions of a first signal (e.g., a preamble) for different CCA results. The time domain baseband version occupies one OFDM symbol.
During the CCA procedure (515), the transmitter 210 detects that BWPs 505-1 and 505-2 are available and BWPs 505-3 and 505-4 are blocked. The transmitter 210 selects (520) versions corresponding to the BWP 505-1 and 505-2 based on the CCA result, e.g., within 16us. The selected version of the first signal is transmitted (525) on BWPs 505-1 and 505-2.
After the transmission of the first signal is completed, a subsequent signal (referred to as a second signal) is transmitted (530) on BWPs 505-1 and 505-2. The second signal may be any suitable signal transmitted after the first signal. In embodiments where the first signal is a preamble, the second signal may be a burst of data. In some embodiments, as shown, during transmission of the first signal, the transmitter 210 may generate (528) a second signal to be transmitted on the selected BWPs 505-1 and 505-2 for further reducing processing delay.
At the receiver 220, the BWP used by the transmitter 210 may be determined by detecting the first signal from the transmitter 210. In some embodiments, the first signal may include an indication of the second signal to facilitate reception of the second signal at the receiver 220. For example, the indication may comprise an indication of the length of the second signal.
The length of the second signal may be indicated by the first signal in any suitable manner. In embodiments where the first signal is a preamble based on a ZC sequence and the second signal is a data burst, the cyclic shift of the ZC sequence may be associated with the length of the subsequent data burst. For example, a cyclic shift equal to 0 indicates a burst length of 1 slot, a cyclic shift equal to 1 indicates a burst length of 2 slots, and so on.
In an embodiment in which the first signal is a preamble based on a Gold sequence and the second signal is a data burst, initialization c of the second m-sequence of the Gold sequence init Index n, which may be associated with CCA result CCA Length n of data burst burst-length The following are related: c init ＝n CCA ·2 15 +n burst-length 。
Based on the indication of the length of the second signal, the receiver 220 may detect the second signal at an appropriate timing. In addition, other receivers may be aware of the length of the second signal and may sleep during transmission of the second signal to improve power efficiency.
In some embodiments, at the receiver 220, the first signal may include demodulation reference information for channel estimation. Based on the measurement of the first signal, the receiver 220 may estimate a transmission channel for demodulation, or alternatively for supplementing a demodulation reference signal (DMRS) of the NR.
Fig. 6 illustrates a flowchart of an example method 600 according to some embodiments of the present disclosure. The method 600 may be implemented at the transmitter 210 as shown in fig. 2.
At block 605, multiple versions of a first signal are generated for transmission over multiple bandwidth portions. At block 610, a bandwidth portion is selected from a plurality of bandwidth portions. At block 615, a version of the first signal to be transmitted on the selected portion of bandwidth is selected from a plurality of versions of the first signal. At block 620, the selected version of the first signal is transmitted over the selected portion of bandwidth.
In some embodiments, the plurality of versions may be a plurality of time-domain baseband versions. Multiple frequency domain baseband versions of the first signal may be generated first, and then multiple time domain baseband versions may be generated from the multiple frequency domain baseband versions.
In some embodiments, an idle bandwidth portion is detected as the selected bandwidth portion from a plurality of bandwidth portions.
In some embodiments, during transmission of the selected version of the first signal, a second signal may be generated to be transmitted over the selected portion of bandwidth after the first signal.
In some embodiments, multiple versions of the first signal may be associated with different lengths of the second signal to be transmitted over the selected portion of bandwidth after the first signal.
In some embodiments, the first signal comprises a preamble and the second signal comprises a burst of data.
In some embodiments, the first signal includes demodulation reference information.
It should be appreciated that all of the operations and features described above with reference to fig. 2-5 in relation to transmitter 210 are equally applicable to method 600 and have similar effects. Details will be omitted for the sake of simplicity.
In some embodiments, an apparatus capable of performing method 600 may include means for performing the corresponding steps of method 600. The component may be implemented in any suitable form. For example, the components may be implemented in circuitry or software modules.
In some embodiments, an apparatus capable of performing method 600 comprises: means for generating, at a transmitter, a plurality of versions of a first signal for transmission over a plurality of bandwidth portions; means for selecting a bandwidth part from a plurality of bandwidth parts; means for selecting a version of the first signal from a plurality of versions of the first signal to be transmitted over the selected bandwidth portion; and means for transmitting the selected version of the first signal over the selected portion of bandwidth.
In some embodiments, the plurality of versions is a plurality of time domain baseband versions. The means for generating the plurality of versions of the first signal may comprise: means for generating a plurality of frequency domain baseband versions of a first signal; and means for generating a plurality of time-domain baseband versions from the plurality of frequency-domain baseband versions.
In some embodiments, the means for selecting the bandwidth portion may comprise: means for selecting a bandwidth portion by detecting an idle bandwidth portion from a plurality of bandwidth portions as the selected bandwidth portion.
In some embodiments, the apparatus may include means for generating a second signal during transmission of the selected version of the first signal, the second signal to be transmitted over the selected portion of bandwidth after the first signal.
In some embodiments, multiple versions of the first signal may be associated with different lengths of the second signal to be transmitted over the selected portion of bandwidth after the first signal.
In some embodiments, the first signal comprises a preamble and the second signal comprises a burst of data.
In some embodiments, the first signal includes demodulation reference information.
Fig. 7 is a simplified block diagram of an apparatus 700 suitable for implementing embodiments of the present disclosure. The device 700 may be implemented at or at least partially as part of the transmitter 210 as shown in fig. 2.
As shown, the device 700 includes a processor 710, a memory 720 coupled to the processor 710, a communication module 730 coupled to the processor 710, and a communication interface (not shown) coupled to the communication module 730. Memory 720 stores at least program 740. The communication module 730 is used for two-way communication. The communication interface may represent any interface required for communication.
The program 740 is assumed to include program instructions that, when executed by the associated processor 710, enable the device 700 to operate in accordance with embodiments of the present disclosure, as discussed herein with reference to fig. 2-6. Embodiments herein may be implemented by: computer software executable by the processor 710 of the device 700, or hardware, or a combination of software and hardware. The processor 710 may be configured to implement various embodiments of the present disclosure.
Memory 720 may be of any type suitable to the local technology network and may be implemented using any suitable data storage technology, such as non-transitory computer readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory, as non-limiting examples. Although only one memory 720 is shown in device 700, there may be several memory modules that are physically distinct in device 700. The processor 710 may be of any type suitable to the local technology network and may include, as non-limiting examples, one or more of the following: general purpose computers, special purpose computers, microprocessors, digital Signal Processors (DSPs), and processors based on a multi-core processor architecture. The device 700 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock that is synchronized to the master processor.
All of the operations and features described above with reference to fig. 2-6 in relation to transmitter 210 are equally applicable to device 700 and have similar effects. Details will be omitted for the sake of simplicity.
In general, the various embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of the embodiments of the disclosure are illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented, as non-limiting examples, in the following: hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controllers, or other computing devices, or some combination thereof.
The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product comprises computer executable instructions, such as those included in program modules, that are executed on a target real or virtual processor in a device to perform the method 600 as described above with reference to fig. 2-6. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local device or within a distributed device. In a distributed device, program modules may be located in both local and remote memory storage media.
Program code for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations as described above. Examples of the carrier include a signal, a computer-readable medium.
The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
Moreover, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Various embodiments of the technology have been described. Additionally or alternatively to the above, the following examples are described. Features described in any of the following examples may be utilized with any of the other examples described herein.
Claims (21)
1. A method of signal preprocessing, comprising:
generating, at a transmitter, a plurality of versions of a first signal for transmission over a plurality of bandwidth portions;
selecting a bandwidth part from the plurality of bandwidth parts;
selecting a version of the first signal from the plurality of versions of the first signal to be transmitted over the selected portion of bandwidth; and
transmitting the selected version of the first signal over the selected portion of bandwidth.
2. The method of claim 1, wherein the plurality of versions is a plurality of time-domain baseband versions, and generating the plurality of versions of the first signal comprises:
generating a plurality of frequency domain baseband versions of the first signal; and
the plurality of time-domain baseband versions are generated from the plurality of frequency-domain baseband versions.
3. The method of claim 1 or 2, wherein selecting the bandwidth portion comprises:
the bandwidth part is selected by detecting a free bandwidth part from the plurality of bandwidth parts as the selected bandwidth part.
4. The method of claim 1, further comprising:
during transmission of the selected version of the first signal, a second signal is generated, the second signal to be transmitted on the selected portion of bandwidth after the first signal.
5. The method of claim 1, wherein the multiple versions of the first signal are associated with different lengths of a second signal to be transmitted on the selected portion of bandwidth after the first signal.
6. The method of claim 4 or 5, wherein the first signal comprises a preamble and the second signal comprises a data burst.
7. The method of any of claims 1, 2, 4-5, wherein the first signal comprises demodulation reference information.
8. A transmitter, comprising:
at least one processor; and
at least one memory including computer program code;
the at least one memory and the computer program code are configured to, with the at least one processor, cause the transmitter to:
generating multiple versions of the first signal for transmission over multiple bandwidth portions;
selecting a bandwidth part from the plurality of bandwidth parts;
selecting a version of the first signal from the plurality of versions of the first signal to be transmitted over the selected portion of bandwidth; and
transmitting the selected version of the first signal over the selected portion of bandwidth.
9. The transmitter of claim 8, wherein the plurality of versions are a plurality of time-domain baseband versions, and the at least one memory and the computer program code are configured to, with the at least one processor, cause the transmitter to:
generating a plurality of frequency domain baseband versions of the first signal; and
the plurality of time-domain baseband versions are generated from the plurality of frequency-domain baseband versions.
10. The transmitter of claim 8 or 9, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the transmitter to:
the bandwidth part is selected by detecting a free bandwidth part from the plurality of bandwidth parts as the selected bandwidth part.
11. The transmitter of claim 8, the at least one memory and the computer program code are further configured to, with the at least one processor, cause the transmitter to:
during transmission of the selected version of the first signal, a second signal is generated, the second signal to be transmitted on the selected portion of bandwidth after the first signal.
12. The transmitter of claim 8, wherein the plurality of versions of the first signal are associated with different lengths of a second signal to be transmitted on the selected portion of bandwidth after the first signal.
13. The transmitter of claim 11 or 12, wherein the first signal comprises a preamble and the second signal comprises a data burst.
14. The transmitter of any of claims 8, 9, 11 to 12, wherein the first signal comprises demodulation reference information.
15. A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, causes the processor to perform acts comprising:
generating, at a transmitter, a plurality of versions of a first signal for transmission over a plurality of bandwidth portions;
selecting a bandwidth part from the plurality of bandwidth parts;
selecting a version of the first signal from the plurality of versions of the first signal to be transmitted over the selected portion of bandwidth; and
transmitting the selected version of the first signal over the selected portion of bandwidth.
16. The computer-readable storage medium of claim 15, wherein the plurality of versions are a plurality of time-domain baseband versions, and generating the plurality of versions of the first signal comprises:
generating a plurality of frequency domain baseband versions of the first signal; and
the plurality of time-domain baseband versions are generated from the plurality of frequency-domain baseband versions.
17. The computer-readable storage medium of claim 15 or 16, wherein selecting the bandwidth portion comprises:
the bandwidth part is selected by detecting a free bandwidth part from the plurality of bandwidth parts as the selected bandwidth part.
18. The computer-readable storage medium of claim 15, wherein the acts further comprise:
during transmission of the selected version of the first signal, a second signal is generated, the second signal to be transmitted after the first signal on the selected portion of bandwidth.
19. The computer-readable storage medium of claim 15, wherein the plurality of versions of the first signal are associated with different lengths of a second signal to be transmitted on the selected portion of bandwidth after the first signal.
20. The computer readable storage medium of claim 18 or 19, wherein the first signal comprises a preamble and the second signal comprises a data burst.
21. The computer readable storage medium of any of claims 15, 16, 18 to 19, wherein the first signal comprises demodulation reference information.
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| PCT/CN2018/089093 WO2019227356A1 (en) | 2018-05-30 | 2018-05-30 | Signal pre-processing |
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| WO2019227356A1 (en) | 2019-12-05 |
| CN112237038A (en) | 2021-01-15 |
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