Devices and methods for generating improved pilot signals in a mobile network

Abstract

A wireless transmit device (110), e.g. a UE (110) is disclosed for communication with a wireless receive device (120), e.g. a base station (120). The wireless transmit device (110) is configured to obtain a shaped Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cm of a multiplication of an original ZC sequence with a shaping sequence. Moreover, the wireless transmit device (110) is configured to generate one or more pilot signals based on the shaped ZC sequence and to transmit the one or more pilot signals to the wireless receive device (120). Furthermore, a correspondingly configured wireless receive device (120) is disclosed. The one or more pilot signals based on the shaped ZC sequence may result in less leakage and, thus, better performance.

Description

[0001] DEVICES AND METHODS FOR GENERATING IMPROVED PILOT SIGNALS IN A MOBILE NETWORK

[0002] TECHNICAL FIELD

[0003] The present invention relates to wireless communications. More specifically, the present invention relates to devices and methods for generating improved pilot signals in a mobile network, in particular a 3rd Generation Partnership Project (3GPP) mobile network.

[0004] BACKGROUND

[0005] Zadoff-Chu, ZC, sequences exhibit chirp-like characteristics and find application in various technologies. These ZC sequences are notably employed for generating specific uplink reference signals (also referred to as pilot signals or sounding signals), such as demodulation reference signals, DMRS, and sounding reference signals, SRS, according to 3GPP TS 36.211 (4G LTE) and 3GPP TS 38.213 (5G NR) standard specifications, as well as serving as multiple access preambles in both 3GPP LTE and 5G networks. Beyond telecommunications, ZC sequences also hold promise in sensing technologies, as highlighted by their potential applications.

[0006] However, challenges arise when utilizing ZC sequences for pilot signals, particularly concerning leakage during channel estimation and sensing processes. This leakage stems from factors such as fractional delay and Doppler shifts, leading to degradation in estimation and detection performance. Consequently, mitigating this leakage is essential for ensuring the efficacy of ZC pilot sequences in various practical applications.

[0007] SUMMARY

[0008] It is an objective to provide improved devices and methods for generating improved pilot signals based on ZC sequences in a mobile network, in particular a 3GPP mobile network, with better leakage performance for channel estimation and sensing.

[0009] The foregoing and other objectives are achieved by the subject matter of the independent claims. Further implementation forms are apparent from the dependent claims, the description and the figures.

[0010] According to a first aspect a wireless transmit device for communication with a wireless receive device in a wireless communications system is provided. In an implementation form, the wireless transmit device may be a wireless terminal device and the wireless receive device may be a wireless network device. In an implementation form, the wireless communication system may be a 3 GPP mobile network, in particular a 3 GPP 5G or another future mobile network. In an implementation form, the wireless transmit device may be a user equipment, UE, and the wireless receive device may be a base station, such as a gNB, of a mobile network. The wireless transmit device according to the first aspect is configured to obtain a shaped, i.e. modified Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a point-wise multiplication of an original ZC sequence with a shaping sequence. Moreover, the wireless transmit device according to the first aspect is configured to generate one or more pilot signals based on the shaped ZC sequence and to transmit the one or more pilot signals to the wireless receive device. The one or more pilot signals based on the shaped ZC sequence may result in less leakage and, thus, better performance.

[0011] In a further possible implementation form, the wireless transmit device is configured to receive one or more ZC sequence parameters from the wireless receive device and the wireless transmit device is configured to obtain the shaped ZC sequence based on the one or more ZC sequence parameters. In a further possible implementation form, the wireless transmit device according to the first aspect is configured to generate the shaped ZC sequence based on the one or more ZC sequence parameters. Thus, the wireless transmit device according to the first aspect may efficiently generate the shaped ZC sequence on the fly.

[0012] In a further possible implementation form, the one or more ZC sequence parameters comprises an index value and wherein the wireless transmit device is configured to determine the cyclic shift value Cmbased on the index value. In an implementation form, the wireless transmit device may be configured to randomly select one index value from the possible index values for determining the cyclic shift value Cm. This allows to efficiently make sure that every wireless terminal in a cell is using a different cyclic shift value Cm.

[0013] In a further possible implementation form, the one or more ZC sequence parameters comprise: a root value, a sequence length, and / or a number of ZC sequence repetitions per pilot signal. The number of ZC sequence repetitions per pilot signal defines how many times the shaped ZC sequence is to be concatenated for generating the one or more pilot signals.

[0014] In a further possible implementation form, the wireless transmit device according to the first aspect is configured to generate the shaped ZC sequence based on the one or more ZC sequence parameters based on the following equation: xu, m [n] = Xu[(n + Cm) mod / Vzc]wu,m[n],

[0015] In a further possible implementation form, the wireless transmit device is configured to generate the one or more pilot signals based on the shaped ZC sequence by concatenating, i.e. repeating at least once the shaped ZC sequence with the shaped ZC sequence and / or a portion of the shaped ZC sequence. This allows the wireless transmit device according to the first aspect to efficiently generate the one or more pilot signals, when the one or more pilot signals are larger than the shaped ZC sequence.

[0016] In a further possible implementation form, the wireless transmit device according to the first aspect is configured to determine the shaping sequence by selecting the shaping sequence from a plurality of different selectable shaping sequences.

[0017] In a further possible implementation form, the wireless transmit device according to the first aspect is configured to select the shaping sequence from the plurality of different selectable shaping sequences based on the one or more ZC sequence parameters received from the wireless receive device.

[0018] In a further possible implementation form, the plurality of different selectable shaping sequences comprises a plurality of concatenations of a basis shaping sequence, wherein each basis shaping sequence has a different shape. For instance, a first shaping sequence of the plurality of different shaping sequences may comprise a plurality of concatenations of a first basis shaping sequence with a first pulse size and a second shaping sequence may comprise a plurality of concatenations of a second basis shaping sequence with a second pulse size different from the first pulse size.

[0019] In a further possible implementation form, the wireless transmit device according to the first aspect is configured to transmit to the wireless receive device an indication allowing the wireless receive device to identify or reconstruct the shaping sequence used by the wireless transmit device for generating the one or more pilot signals. In a further possible implementation form, the wireless transmit device according to the first aspect is configured to transmit the one or more pilot signals to the wireless receive device on time, frequency and / or antenna resources.

[0020] In a further possible implementation form, the one or more pilot signals comprise one or more demodulation reference signals, DMRSs, wherein the time, frequency and / or antenna resources are provided by a physical uplink shared channel, PUSCH, with a comb pattern in the frequency domain.

[0021] In a further possible implementation form, the shaping sequence provides attenuation at one or more of the following points tu qof the original ZC sequence: wherein u denotes a root value, q denotes an integer, Ncdenotes the size of the ZC sequence, and At denotes an inverse of a bandwidth.

[0022] According to a second aspect a method of operating a wireless transmit device is provided. The method according to the second aspect comprises the steps of: obtaining a shaped, i.e. modified Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a point-wise multiplication of an original ZC sequence with a shaping sequence; generating one or more pilot signals based on the shaped ZC sequence; and transmitting the one or more pilot signals to the wireless receive device.

[0023] The one or more pilot signals based on the shaped ZC sequence may lead to less leakage. The method according to the second aspect can be performed by the wireless transmit device according to the first aspect. Thus, further features of the method according to the second aspect result directly from the functionality of the wireless transmit device according to the first aspect as well as its different implementation forms described above and below.

[0024] According to a third aspect a wireless receive device for communication with a wireless transmit device in a wireless communications system is provided. In an implementation form, the wireless receive device may be a wireless network device and the wireless transmit device may be a wireless terminal device. In an implementation form, the wireless receive device may be a base station, such as a gNB, and the wireless transmit device may be a user equipment, UE, of a mobile network. The wireless receive device according to the third aspect is configured to receive one or more pilot signals from the wireless transmit device, wherein the one or more pilot signals are based on a shaped, i.e. modified Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a point-wise multiplication of an original ZC sequence with a shaping sequence.

[0025] In a further possible implementation form, the wireless receive device is configured to transmit one or more ZC sequence parameters to the wireless transmit device for allowing the wireless transmit device to obtain the shaped ZC sequence based on the one or more ZC sequence parameters.

[0026] In a further possible implementation form, the one or more ZC sequence parameters comprise an index value and the cyclic shift value Cmis based on the index value. In a further possible implementation form, the one or more ZC sequence parameters comprise: a root value, a sequence length, and / or a number of ZC sequence repetitions per pilot signal.

[0027] In a further possible implementation form, the shaped ZC sequence is generated based on the one or more ZC sequence parameters based on the following equation: xu, m M = xu[(n + Cm) mod / Vzc]wu,m[n], wherein wu m[n] = wu[(n + Cm) mod 1VZC] denotes the cyclically shifted shaping sequence, wudenotes the shaping sequence, and Nzcdenotes the sequence length.

[0028] In a further possible implementation form, the one or more pilot signals are based on a concatenation of the shaped ZC sequence at least once with the shaped ZC sequence and / or a portion of the shaped ZC sequence.

[0029] In a further possible implementation form, the shaping sequence is selected from a plurality of different selectable shaping sequences.

[0030] In a further possible implementation form, the shaping sequence is selected from the plurality of different selectable shaping sequences based on one or more ZC sequence parameters transmitted by the wireless receive device.

[0031] In a further possible implementation form, the plurality of different selectable shaping sequences comprises a plurality of concatenations of a basis shaping sequence, wherein each basis shaping sequence has a different shape.

[0032] In a further possible implementation form, the wireless receive device is configured to receive from the wireless transmit device an indication and to identify or reconstruct, based on the indication, the shaping sequence used by the wireless transmit device for generating the one or more pilot signals.

[0033] In a further possible implementation form, the wireless receive device is configured to receive the one or more pilot signals from the wireless transmit device on time, frequency and / or antenna resources.

[0034] In a further possible implementation form, the one or more pilot signals comprise one or more demodulation reference signals, DMRSs, and wherein the time, frequency and / or antenna resources are provided by a physical uplink shared channel, PUSCH, with a comb pattern in the frequency domain.

[0035] In a further possible implementation form, the shaping sequence provides attenuation at one or more of the following points tu qof the original ZC sequence: wherein u denotes a root value, q denotes an integer, Ncdenotes the size of the ZC sequence, and At denotes an inverse of a bandwidth.

[0036] According to a fourth aspect a method of operating a wireless receive device is provided. The method according to the fourth aspect comprises receiving one or more pilot signals from a wireless transmit device, wherein the one or more pilot signals are based on a shaped, i.e. modified Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a point-wise multiplication of an original ZC sequence with a shaping sequence.

[0037] The one or more pilot signals based on the shaped ZC sequence may lead to less leakage. The method according to the fourth aspect can be performed by the wireless receive device according to the third aspect. Thus, further features of the method according to the fourth aspect result directly from the functionality of the wireless receive device according to the third aspect as well as its different implementation forms described above and below.

[0038] According to a fifth aspect a computer program product is provided, comprising program code which causes a computer or a processor to perform the method according to the second aspect or the method according to the fourth aspect, when the program code is executed by the computer or the processor.

[0039] Details of one or more embodiments are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description, drawings, and claims.

[0040] BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In the following, embodiments of the present disclosure are described in more detail with reference to the attached figures and drawings, in which:

[0042] Fig. 1 is a schematic diagram showing a wireless communication system, including a plurality of wireless transmit devices according to an embodiment in communication with a wireless receive device according to an embodiment;

[0043] Fig. 2 is a diagram illustrating different stages implemented by a wireless transmit device according to an embodiment for generating an improved ZC sequence and pilot signals;

[0044] Fig. 3 is a schematic diagram showing a wireless communication system, including a wireless transmit device according to an embodiment in communication with a wireless receive device according to an embodiment;

[0045] Fig. 4 is a diagram illustrating an original ZC sequence as well as a first shaping sequence and a second shaping sequence implemented by a wireless transmit device according to an embodiment for generating a shaped ZC sequence;

[0046] Fig. 5 is a diagram illustrating the operation of an OFDM modulator implemented by a wireless transmit device according to an embodiment;

[0047] Fig. 6 shows a flow diagram illustrating steps of a method of operating a wireless transmit device according to an embodiment; and

[0048] Fig. 7 shows a flow diagram illustrating steps of a method of operating a wireless receive device according to an embodiment.

[0049] In the following, identical reference signs refer to identical or at least functionally equivalent features. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] In the following description, reference is made to the accompanying figures, which form part of the disclosure, and which show, by way of illustration, specific aspects of embodiments of the present disclosure or specific aspects in which embodiments of the present disclosure may be used. It is understood that embodiments of the present disclosure may be used in other aspects and comprise structural or logical changes not depicted in the figures. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims.

[0051] For instance, it is to be understood that a disclosure in connection with a described method may also hold true for a corresponding device or system configured to perform the method and vice versa. For example, if one or a plurality of specific method steps are described, a corresponding device may include one or a plurality of units, e.g. functional units, to perform the described one or plurality of method steps (e.g. one unit performing the one or plurality of steps, or a plurality of units each performing one or more of the plurality of steps), even if such one or more units are not explicitly described or illustrated in the figures. On the other hand, for example, if a specific apparatus is described based on one or a plurality of units, e.g. functional units, a corresponding method may include one step to perform the functionality of the one or plurality of units (e.g. one step performing the functionality of the one or plurality of units, or a plurality of steps each performing the functionality of one or more of the plurality of units), even if such one or plurality of steps are not explicitly described or illustrated in the figures. Further, it is understood that the features of the various exemplary embodiments and / or aspects described herein may be combined with each other, unless specifically noted otherwise.

[0052] Figure 1 shows an exemplary wireless communication network 100, in particular a 3GPP mobile network 100, including a wireless receive device 120, e.g. a wireless network device 120, such as a base station 120, configured to provide network access to a plurality of wireless transmit devices 110, e.g. wireless terminal devices 110, such as UEs 110. A further embodiment of an exemplary wireless communication network 100 is shown in figure 3, including a wireless transmit device 110 and a wireless receive device 120. As illustrated in figures 1 and 3 both the wireless receive device 120, e.g. base station 120 and the wireless transmit devices 110, e.g. UEs 110 may comprise a plurality of antennas, for instance, for beamforming. Moreover, in the embodiments shown in figures 1 and 3, each wireless transmit device 110, e.g. UE 110 comprises a transmit (Tx) unit 111 for generating and transmitting transmit signals and a receive (Rx) unit 113 for receiving and processing receive signals. Each wireless transmit device 110, e.g. UE 110 may comprise further processing circuitry for implementing at least some of the functionality disclosed herein. The processing circuitry may be implemented in hardware and / or software. The hardware may comprise digital circuitry, or both analog and digital circuitry. Digital circuitry may comprise components such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), or one or more general-purpose processors. Moreover, each wireless transmit device 110, e.g. UE 110 may comprise a memory configured to store executable program code which, when executed by the processing circuitry, causes the wireless transmit device 110, e.g. UE 110 to perform the functions and operations described herein.

[0053] Likewise, the wireless receive device 120, e.g. base station 120 may comprise processing circuitry for implementing at least some of the functionality disclosed herein. The processing circuitry may be implemented in hardware and / or software. The hardware may comprise digital circuitry, or both analog and digital circuitry. Digital circuitry may comprise components such as application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), digital signal processors (DSPs), or one or more general-purpose processors. Moreover, the wireless receive device 120, e.g. base station 120 may comprise a memory configured to store executable program code which, when executed by the processing circuitry, causes the wireless receive device 120, e.g. base station 120 to perform the functions and operations described herein. As will be described in more detail in the following under further reference to figure 2, each wireless transmit device 110, e.g. UE 110 is configured to obtain a shaped Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence. Moreover, each wireless transmit device 110, e.g. UE 110 is configured to generate one or more pilot signals based on the shaped ZC sequence and to transmit the one or more pilot signals to the wireless receive device 120, e.g. base station 120. In an embodiment, the wireless transmit device 110, e.g. UE 110 is configured to transmit the one or more pilot signals based on the shaped ZC sequence on time, frequency and / or antenna resources to the wireless receive device 120, e.g. base station 120. In an embodiment, the one or more pilot signals comprise one or more demodulation reference signals, DMRSs, and the time, frequency and / or antenna resources are provided by a physical uplink shared channel, PUSCH, with a comb pattern in the frequency domain.

[0054] In an embodiment, the original ZC sequence xuwith root value u and length Nzcmay be represented in the following way:

[0055] In an embodiment, the wireless transmit device 110, e.g. UE 110 is configured to obtain the shaped ZC sequence based on the original ZC sequence by generating the shaped ZC sequence based on the original ZC sequence on the fly or by retrieving the shaped ZC sequence based on the original ZC sequence from memory.

[0056] In an embodiment, the wireless transmit device 110, e.g. UE 110 is configured to generate the shaped ZC sequence using a cyclically shifted shaping sequence wu m[n] that is dependent on both the root value u and the cyclic shift value Cm. More specifically, in an embodiment, the wireless transmit device 110, e.g. UE 110 is configured to first multiply (using a pointwise multiplication) the original ZC sequence xuwith the shaping sequence wubefore applying a cyclic shift Cmto the result of the pointwise multiplication for obtaining the shaped ZC sequence xu m| n | as follows: xu,m M = xu[(n + Cm) mod / Vzc]wu,m[n], wherein wu m[n] = wu[(n + Cm) mod 7VZC] denotes the cyclically shifted shaping sequence.

[0057] In an embodiment, the wireless transmit device 110, e.g. UE 110 is configured to generate the one or more pilot signals based on the shaped ZC sequence xu m|n| . For generating the original ZC sequence xuthe wireless transmit device 110, e.g. UE 110 is configured to determine the cyclic shift value Cmby randomly selecting its index m from a set of possible index values signaled by the wireless receive device 120, e.g. base station 120.

[0058] In an embodiment, the shaping sequence provides attenuation of the original ZC sequence at one or more of the following points tu qof the original ZC sequence: wherein u denotes the root value, q denotes an integer, Ncdenotes the size of the ZC sequence, and At denotes an inverse of a bandwidth, such as the bandwidth used for transmitting the one or more pilot signals. Attenuation at one or more of these points tu qis advantageous, because the oversampled original ZC sequence exhibits large variations at these points. These critical points tu qhave been found by analyzing the instantaneous phase of the continuous time version of the original ZC sequence xuand identifying the discontinuities. As will be appreciated, these high variations matter in presence of a wireless channel with fractional-valued path delays leading to leakage. In order to minimize or at least mitigate this leakage according to embodiments disclosed herein the shaping sequence used for generating the shaped ZC sequence provides attenuation of the original ZC sequence at one or more of the critical points tu q.

[0059] Figure 4 is a diagram illustrating an original ZC sequence (indicated as curve A) as well as a first shaping sequence and a second shaping sequence (indicated as curves B and C) implemented by the wireless transmit device 110, e.g. UE 110 according to an embodiment for generating the shaped ZC sequence. As will be appreciated, in the example shown in figure 4, the first shaping sequence (indicated as curve B) provides a stronger attenuation of the original ZC sequence than the second shaping sequence (indicated as curve C).

[0060] In an embodiment, the wireless transmit device 110, e.g. UE 110 is configured to receive from the wireless receive device 120, e.g. base station 120 one or more ZC sequence parameters, in particular ZC codebook parameters for generating the shaped ZC sequence. In an embodiment, the one or more ZC sequence parameters may include, for instance, the root value, the sequence length, and the index set of allowed cyclic shifts. Moreover, the wireless transmit device 110, e.g. UE 110 may receive from the wireless receive device 120, e.g. base station 120 a sub-pulse indicator indicative of a sub-pulse for generating the shaping sequence. An exemplary sub-pulse for generating the shaping sequence is illustrated in the top most diagram of figure 2. In a further embodiment, the wireless transmit device 110, e.g. UE 110 may select a sub-pulse for generating the shaping sequence and provide a sub-pulse indicator indicative of the selected sub-pulse to the wireless receive device 120, e.g. base station 120. The wireless transmit device 110, e.g. UE 110 is further configured to generate the shaping sequence for leakage attenuation by concatenating the selected or received sub-pulse a number of times based on the root value, as illustrated in the second to top diagram of figure 2. Moreover, the wireless transmit device 110, e.g. UE 110 is further configured to apply a cyclic shift with the selected cyclic shift value to the concatenation of the sub pulse, as illustrated in the second to bottom diagram of figure

[0061] 2. As already described above, the wireless transmit device 110, e.g. UE 110 is further configured to generate the shaped ZC sequence as the pointwise product of the original ZC sequence and the shaping sequence and applying the selected cyclic shift to the resulting sequence, as illustrated in the bottom most diagram of figure 2. The one or more pilot signals may be generated based on the shaped ZC sequence. For instance, the one or more pilot signals may be generated by mapping the shaped ZC sequence to pre-defined time, frequency and / or antenna resources.

[0062] More specifically, in an embodiment, the wireless transmit device 110, e.g. UE 110 may be configured to implement the following steps for generating the one or more pilot signals based on the shaped ZC sequence: 6. The shaped ZC sequence is computed by the wireless terminal device 110, e.g. UE 110 as xu m[n] = xu m[n]wu m[n] (as illustrated by the bottom diagram of figure 2).

[0063] 7. The wireless transmit device 110, e.g. UE 110 transmits the resulting one or more pilot signals on the time, frequency and / or antenna resources assigned by the network.

[0064] If the wireless receive device 120, e.g. base station 120 receiving the one or more pilot signals performs channel estimation or sensing based on the original ZC sequence xu m, the estimated channel would not be the actual channel but an effective channel including the effect of the sub-pulse shape iv. In communications this might lead to channel estimation error. Therefore, in an embodiment, the wireless transmit device 110, e.g. UE 110 is further configured to signal to the wireless receive device 120, e.g. base station 120 an indicator for the sub-pulse shape w (as indicated in figures 1 and 3) used by the wireless transmit device 110, e.g. UE 110 for generating the shaped ZC sequence so that the wireless receive device 120, e.g. base station 120 may perform channel estimation based on xu m= xu mQwu minstead of xu m.

[0065] As will be appreciated, pilot codebook memory requirements are as low as ZC pilot sequences. Since shifting in time generates additional shaped, i.e. enhanced ZC pilot sequences, only reference sequences need to be stored. From these stored references, the shaped, i.e. enhanced ZC pilot sequences may be derived as:

[0066] Moreover, in an embodiment, pilot codebook storage may be done using the frequency domain version of the sequences for direct use as input to the OFDM modulator 501, as illustrated in figure 5.

[0067] Figure 6 shows a flow diagram illustrating steps of a method 600 of operating the wireless transmit device 110, e.g. the UE 110. The method 600 comprises a step 601 of obtaining a shaped ZC sequence, wherein, as described above in detail, the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence. The method 600 further comprises a step 603 of generating one or more pilot signals based on the shaped ZC sequence and a step 605 of transmitting the one or more pilot signals to the wireless receive device 120.

[0068] Figure 7 shows a flow diagram illustrating steps of a method 700 of operating the wireless receive device 120, e.g. the base station 120. The method 700 comprises a step 701 of receiving one or more pilot signals from the wireless transmit device 110, e.g. UE 110, wherein the pilot signal is based on a shaped ZC sequence and wherein, as described above in detail, the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence.

[0069] The person skilled in the art will understand that the "blocks" ("units") of the various figures (method and apparatus) represent or describe functionalities of embodiments of the present disclosure (rather than necessarily individual "units" in hardware or software) and thus describe equally functions or features of apparatus embodiments as well as method embodiments (unit = step).

[0070] In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described embodiment of an apparatus is merely exemplary. For example, the unit division is merely logical function division and may be another division in an actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.

[0071] The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

[0072] In addition, functional units in the embodiments of the invention may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.

Claims

CLAIMS1. A wireless transmit device (110) configured to: obtain a shaped Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence; generate one or more pilot signals based on the shaped ZC sequence; transmit the one or more pilot signals to a wireless receive device (120).

2. The wireless transmit device (110) of claim 1, wherein the wireless transmit device (110) is configured to receive one or more ZC sequence parameters from the wireless receive device (120) and wherein the wireless transmit device (110) is configured to obtain the shaped ZC sequence based on the one or more ZC sequence parameters.

3. The wireless transmit device (110) of claim 2, wherein the wireless transmit device (110) is configured to generate the shaped ZC sequence based on the one or more ZC sequence parameters.

4. The wireless transmit device (110) of claim 3, wherein the one or more ZC sequence parameters comprises an index value and wherein the wireless transmit device (110) is configured to determine the cyclic shift value Cmbased on the index value.

5. The wireless transmit device (110) of any one of claims 2 to 4, wherein the one or more ZC sequence parameters comprise: a root value, a sequence length, and / or a number of ZC sequence repetitions per pilot signal.

6. The wireless transmit device (110) of any one of claims 3 to 5, wherein the wireless transmit device (110) is configured to generate the shaped ZC sequence based on the one or more ZC sequence parameters based on the following equation: xu,m[n] = „[( + Cm) mod / Vzc]wu,m[n], wherein wu m[n] = wu[(n + Cm) mod N7C] denotes the cyclically shifted shaping sequence, wudenotes the shaping sequence, and Nzcdenotes the sequence length.

7. The wireless transmit device (110) of any one of the preceding claims, wherein the wireless transmit device (110) is configured to generate the one or more pilot signals based on the shaped ZC sequence by concatenating at least once the shaped ZC sequence with the shaped ZC sequence and / or a portion of the shaped ZC sequence.

8. The wireless transmit device (110) of any one of the preceding claims, wherein the wireless transmit device (110) is configured to determine the shaping sequence by selecting the shaping sequence from a plurality of selectable shaping sequences.

9. The wireless transmit device (110) of claim 8, wherein the wireless transmit device (110) is configured to select the shaping sequence from the plurality of selectable shaping sequences based on one or more ZC sequence parameters received from the wireless receive device (120).

10. The wireless transmit device (110) of claim 8 or 9, wherein the plurality of selectable shaping sequences comprises a plurality of concatenations of a basis shaping sequence, wherein each basis shaping sequence has a different shape.

11. The wireless transmit device (110) of claim 10, wherein the wireless transmit device (110) is configured to transmit to the wireless receive device (120) an indication allowing the wireless receive device (120) to identify or reconstruct the shaping sequence used by the wireless transmit device (110) for generating the one or more pilot signals.

12. The wireless transmit device (110) of any one of the preceding claims, wherein the wireless transmit device (110) is configured to transmit the one or more pilot signals to the wireless receive device (120) on time, frequency and / or antenna resources.

13. The wireless transmit device (110) of claim 12, wherein the one or more pilot signals comprise one or more demodulation reference signals, DMRSs, and wherein the time, frequency and / or antenna resources are provided by a physical uplink shared channel, PUSCH, with a comb pattern in the frequency domain.

14. The wireless transmit device (110) of any one of the preceding claims, wherein the shaping sequence provides attenuation at one or more of the following points tu qof the original ZC sequence:wherein u denotes a root value, q denotes an integer, Ncdenotes the size of the ZC sequence, and At denotes an inverse of a bandwidth.

15. A method (600) of operating a wireless transmit device (110), wherein the method (600) comprises: obtaining (601 ) a shaped Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence; generating one or more pilot signals based on the shaped ZC sequence; and transmitting the one or more pilot signals to a wireless receive device (120).

16. A wireless receive device (120) configured to: receive one or more pilot signals from a wireless transmit device (110), wherein the one or more pilot signals are based on a shaped Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence.

17. The wireless receive device (120) of claim 16, wherein the wireless receive device (120) is configured to transmit one or more ZC sequence parameters to the wireless transmit device (110) for allowing the wireless transmit device (110) to obtain the shaped ZC sequence based on the one or more ZC sequence parameters.

18. The wireless receive device (120) of claim 17, wherein the one or more ZC sequence parameters comprise an index value and wherein the cyclic shift value Cmis based on the index value.

19. The wireless receive device (120) of claim 17 or 18, wherein the one or more ZC sequence parameters comprise: a root value, a sequence length, and / or a number of ZC sequence repetitions per pilot signal.

20. The wireless receive device (120) of any one of claims 17 to 19, wherein the shaped ZC sequence is generated based on the one or more ZC sequence parameters based on the following equation: xu,m[n] = „[( + Cm) mod / Vzc]wu,m[n], wherein wu m[n] = wu[(n + Cm) mod N7C] denotes the cyclically shifted shaping sequence, wudenotes the shaping sequence, and Nzcdenotes the sequence length.

21. The wireless receive device (120) of any one of claims 16 to 20, wherein the one or more pilot signals are based on a concatenation of the shaped ZC sequence at least once with the shaped ZC sequence and / or a portion of the shaped ZC sequence.

22. The wireless receive device (120) of any one of claims 16 to 21, wherein the shaping sequence is selected from a plurality of selectable shaping sequences.

23. The wireless receive device (120) of claim 22, wherein the shaping sequence is selected from the plurality of selectable shaping sequences based on one or more ZC sequence parameters transmitted by the wireless receive device (120).

24. The wireless receive device (120) of claim 22 or 23, wherein the plurality of selectable shaping sequences comprises a plurality of concatenations of a basis shaping sequence, wherein each basis shaping sequence has a different shape.

25. The wireless receive device (120) of claim 24, wherein the wireless receive device (120) is configured to receive from the wireless transmit device (110) an indication and to identify or reconstruct, based on the indication, the shaping sequence used by the wireless transmit device (110) for generating the one or more pilot signals.

26. The wireless receive device (120) of any one of claims 16 to 25, wherein the wireless receive device (120) is configured to receive the one or more pilot signals from the wireless transmit device (110) on time, frequency and / or antenna resources.

27. The wireless receive device (120) of claim 26, wherein the one or more pilot signals comprise one or more demodulation reference signals, DMRSs, and wherein the time, frequency and / or antenna resources are provided by a physical uplink shared channel, PUSCH, with a comb pattern in the frequency domain.

28. The wireless receive device (120) of any one of claims 16 to 27, wherein the shaping sequence provides attenuation at one or more of the following points tu qof the original ZC sequence:wherein u denotes a root value, q denotes an integer, Ncdenotes the size of the ZC sequence, and At denotes an inverse of a bandwidth.

29. A method (700) of operating a wireless receive device (120), wherein the method (700) comprises: receiving (701) one or more pilot signals from a wireless transmit device (110), wherein the one or more pilot signals are based on a shaped Zadoff-Chu, ZC, sequence, wherein the shaped ZC sequence is based on a cyclic shift with a cyclic shift value Cmof a multiplication of an original ZC sequence with a shaping sequence.

30. A computer program product comprising a computer-readable storage medium for storing program code which causes a computer or a processor to perform the method (600) of claim 15 or the method (700) of claim 29 when the program code is executed by the computer or the processor.

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