CN115426231A - Novel wireless RA preamble design method based on pruning DFT spread FBMC and coverage sequence - Google Patents
Novel wireless RA preamble design method based on pruning DFT spread FBMC and coverage sequence Download PDFInfo
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
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- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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Abstract
The invention relates to the field of communication, and discloses a novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence. The novel wireless RA preamble design method comprises the steps of obtaining a covering sequence; the generated covering sequence is pruned through discrete Fourier transform, input into a filter bank FBMC, and finally detected by using an FBMC structure. The invention is used for solving the problem of the synchronization of the pilot signals of the UE in the uplink, maintaining the orthogonality of the signals, compensating the arrival time delay difference and the arrival frequency difference of the signals and solving the problem of subcarrier offset.
Description
Technical Field
The invention relates to the field of communication, in particular to a novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence.
Background
Timing Advance (TA) is a key technology used for synchronization in the uplink of communication, i.e. during Random Access (RA), the RACH is transmitted in the Random Access Channel to obtain the value. In order to ensure the time timing synchronization of an eNodeB terminal, the LTE protocol provides a TA technical mechanism. The technology is used for transmission of uplink signals, and the time amount of an uplink data frame sent by the UE needs to be advanced compared with a downlink frame. Since there may be different users accessing in a communication cell in a period of time, maintaining orthogonality between them can avoid intersymbol interference, while TA technique makes a timing estimate for the transmission advance needed for their uplink synchronization. In the terrestrial mobile communication, a user can select one from the preferable random access preambles to transmit to the base station, and the base station determines the value of the TA according to the round-trip delay difference between different users. In a satellite communication scenario, a large distance and a fast relative movement rate between the UE and the satellite need to be considered. The technology is based on the random access technology to realize uplink synchronization.
The timing advance technology mainly relates to two aspects, namely the design of a timing detection algorithm and a random access preamble.
While the timing detection algorithm is continuously updated, the design of Random Access Preamble (Random Access Preamble) is followed. Because the RAP characterizes the identity of different UEs, it is an important basis for the base station or satellite to identify different UEs. At present, numerous scholars have innovated and improved the design of RAPs. Particularly, with the development of 5GNR, there have been many developments in the millimeter wave field, multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM), and IoT systems.
The wireless random access is one of core technologies of a communication system, and is used for establishing an uplink communication process from a UE to a base station or a satellite. The RAP preamble is uniquely identified and can respond accurately to the UE. Since the preamble detector can estimate the Round Trip Delay (RTD) of the UE and the base station. In the satellite scenario, the main problems to be faced are relatively small multipath effect, large beam coverage radius, long propagation delay, and large path loss. The duration of the preamble must be extended to eliminate ISI and ICI. For the coverage problem, the length of the sequence needs to be lengthened. In view of satellite power limitations, a low complexity detection method is needed to reduce the implementation cost. M.casoni and l.siyang et al propose several preamble schemes and detection methods under LTE-satellite system. The most widely used method is based on the generic preamble of the LTE system, but requires a high computational complexity. In addition, a large number of root index ZC sequences are applied, further reducing complexity. He et al propose a precompensation method to design the preamble format and use the least square method to estimate the round-trip delay difference in advance to achieve the purpose of reducing the CP and GT time and the number of root indexes, but the method still has a large computational complexity. In the two-step strategy, which is also an improvement of timing estimation, multiple repeated ZC sequences are sent continuously within a suitable time frame that satisfies the conditions, so that a fractional TA value can be obtained. By transmitting one RA sequence again, the value of the integer multiple TA can be calculated. In addition, the scholars fill the control information into the preamble from the change of the preamble format and the slot length, thereby greatly shortening the RA flow.
Depending on the application conditions and requirements of 5G, the NR-satellite system should reduce energy consumption effectively, reduce cost to ensure availability, greater reliability and greater robustness. Detection of the leader plays a crucial role therein. The 5G-NR is intended to support various new requirements such as enhanced mobile bandwidth (eMBB), mass machine type communication (mtc), and high-reliability low-latency communication (URLLC). In NR systems, RA needs to be implemented by a protocol that enables efficient initial synchronization between the UE and the next generation nodes (gnbs). Saur et al designs use m-sequences and delayed doppler frequency shifting to cancel channel impairments, making the algorithm more robust while enhancing the RACH capacity. In the NR system, a random access signal is obtained by modulating a ZC sequence onto single carrier frequency division multiplexing (SC-FDM). In order to solve the problems of constant false alarm, low correlation peak value, false peak, etc., sesia et al propose to combine the limited preamble set and the peak value, but this method will cause the correlation peak value to shift when the normalized CFO is larger than the SCS, resulting in a larger deviation of the timing estimation.
Due to the principle of LEO satellite or MEO satellite in NTN architecture, UE has very large moving speed, the RACH preamble sequence designed for the terrestrial NR network cannot be directly applied to the NTN network, that is, further improvement and design are needed to initiate access. The construction of the preamble can still be performed using ZC sequences according to the general design principles of RACH. In the present study, many researchers have optimized and improved the computational complexity, the detection length of the synchronization code, and the elimination of the CFO, respectively. However, none of these solutions fully addresses these issues, and thus, there appears to be a trade-off and contradiction between eliminating CFO and reducing complexity. Such contradiction can be realized by a multi-root cascade and joint detection method.
Disclosure of Invention
The invention provides a novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence, which is used for solving the problem of synchronization of a UE preamble signal in an uplink, maintaining the orthogonality of the signal, compensating the time delay difference and the frequency difference of the signal arrival and solving the problem of subcarrier offset.
The invention provides a novel wireless RA preamble system based on pruning DFT spread FBMC and a covering sequence, which is used for solving the problem of synchronization of a preamble signal of UE in an uplink, maintaining the orthogonality of the signal, compensating the time delay difference and the frequency difference of the arrival of the signal and solving the problem of subcarrier offset.
The present invention provides a computer-readable storage medium having a computer program stored therein.
The invention is realized by the following technical scheme:
a novel wireless RA lead code design method based on pruning DFT spread FBMC and a covering sequence is characterized in that the covering sequence is obtained; the generated covering sequence is pruned through discrete Fourier transform, input into a filter bank FBMC, and finally detected by using an FBMC structure.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence is provided, wherein the covering sequence is obtained by multiplying sequences with different cyclic indexes and sequences with different feedback coefficients.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and coverage sequences, multiplying sequences with different cyclic indexes and sequences with different feedback coefficients,
the ZC sequence expression is as follows:
wherein N is zc Is the sequence length; u is the root index; n is the data sequence number N in the sequence c Is a cyclic shift interval;
corresponding to a sequence cyclically shifted k times;
the expression of the m sequence is:
wherein α is GF (2) m ) The primitive element of (1).
A novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence utilizes a double-layer ZC sequence and an m sequence for covering, and comprises the following steps:
C u,k,v,μl [n]＝[x u [n]·y μl [n]] k ·m v [n]
the resulting set is then as follows:
wherein u is a root index of a ZC139 sequence, μ is a root index of a ZC 839 sequence, k is a cyclic shift interval number index, and
a novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequences, in a frame structure, the length of a sequence A is 140, and the sequence A is composed of covering sequences with the lengths of 139 and zero; sequence segment a is repeated three times to form a sequence of length 420, forming a preamble frame structure.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequence, the generated covering sequence is pruned by discrete Fourier transform, input into filter bank, and finally detected,
performing pruning and DFT precoding on the generated covering sequence, inputting the covering sequence into FBMC, and then zeroing to obtain a transmission sequence with smaller crosstalk; larger carrier offsets can be compensated for by decoding operations and using structural features of the signal frame.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequence, in FBMC, the filter in the filter bank is the time-frequency conversion of prototype narrow-band low-pass filter p (t); parallel summer holidays were modulated onto M subbands at intervals of Δ f, yielding:
wherein l m [k]A true value signal modulated on the mth subband of the k time slot is represented; when the input is M a A/2 complex symbols, then
l[k]＝CPx[k]，[x[k]] m ＝C u,v,k [m],k＝1,2,…,7。
A novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence is provided, and the final decoding operation is obtained
The delay spread may cause cyclic shift of the decoded sequence, and the frequency offset may cause an additional frequency offset to be added to each data.
A novel wireless RA preamble system based on pruning DFT spread FBMC and a covering sequence comprises a sequence processing module, a sequence calculating module and an FBMC structure;
the sequence processing module is used for multiplying sequences with different cyclic indexes and sequences with different feedback coefficients to obtain a covering sequence;
the sequence calculation module is used for pruning the generated covering sequence through discrete Fourier transform and inputting the pruning result into a filter bank;
the FBMC structure is used to detect peak or frequency offset data.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method steps.
The beneficial effects of the invention are:
the invention can obtain good result for large carrier offset; and the user capacity of the communication cell can be increased.
The invention compensates for the larger subcarrier offset problem and the structure is used as a feasible predictive design for adding CP.
Drawings
Fig. 1 is a schematic diagram of the frame structure of the present invention.
Fig. 2 is a schematic diagram of an in-beam UE of the present invention.
Fig. 3 is a timing detection schematic of the present invention.
Fig. 4 is an access flow diagram of the present invention.
FIG. 5 is a spectrogram relating to a received sequence and a local root sequence in accordance with the present invention.
Fig. 6 is a line graph after CFO compensation according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A novel wireless RA lead code design method based on pruning DFT spread FBMC and a covering sequence is characterized in that the covering sequence with good cross correlation and autocorrelation characteristics is obtained; the generated covering sequence is pruned through discrete Fourier transform, input into a filter bank FBMC, and finally detected by using an FBMC structure.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequences, wherein the covering sequences with good cross correlation and autocorrelation characteristics are obtained before the covering sequences with good cross correlation and autocorrelation characteristics are multiplied by sequences with different cyclic indexes and sequences with different feedback coefficients. The new sequences have good auto-and cross-correlation properties. By using different sequence cyclic indexes and different sequence feedback coefficients, users can be uniquely labeled, thereby achieving greater user capacity.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequences, multiplying sequences with different cyclic indexes and sequences with different feedback coefficients,
the ZC sequence expression is as follows:
wherein N is zc Is the sequence length; u is the root index; n is the data sequence number N in the sequence c Is a cyclic shift interval;
the expression of the m sequence is:
wherein α is GF (2) m ) The primitive element of (1).
A novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence is characterized in that the specification of an immediate preamble format of LTE and the knowledge of a ZC sequence are known, the ZC sequence has 139 formats and 839 formats, and the length of 139 corresponds to the format 4 of a random access preamble. And thus can be designed using both ZC sequences. As is known from the specification of 3gpp TR 38.821, the PRACH preamble format for NR enhancement can be designed with Gold/m sequences as preamble sequences with additional procedures (e.g. modulation and transform precoding). Therefore, on the basis of the single-layer ZC sequence and the m sequence which are proposed in the prior art, a double-layer ZC sequence and an m sequence are used for covering. The number of available preambles can be further increased, thereby increasing user capacity.
For example, by repeatedly expanding 7 different generator polynomial m-sequences to 139 lengths, then sorting 839 length ZC sequences to 6 139 lengths, and then 139 with different root indices ZC Sequence combining, a new cover sequence can be generated as follows:
C u,k,v,μl [n]＝[x u [n]·y μl [n]] k ·m v [n]
the resulting set is as follows:
wherein u is a root index of a ZC139 sequence, μ is a root index of a ZC 839 sequence, k is a cyclic shift interval number index, and
a novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequences, in a frame structure, the length of a sequence A is 140, and the sequence A is composed of covering sequences with the lengths of 139 and zero; the sequence segment a is repeated three times to form a sequence with a length of 420, as shown in fig. 1, forming a preamble frame structure.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequence, the generated covering sequence is pruned by discrete Fourier transform, input into filter bank, and finally detected,
pruning the generated covering sequence, performing DFT precoding, inputting the covering sequence into the FBMC, and then zeroing to obtain a transmission sequence with smaller crosstalk (compared with the traditional signal structure, the two ends of the signal can be in a 0 filling structure by using the FBMC scheme, and the crosstalk is reduced); larger carrier (1 times subcarrier spacing) offsets can be compensated for by decoding operations and using structural features of the signal frame.
A novel wireless RA preamble design method based on pruning DFT spread FBMC and covering sequence, in FBMC, the filter in the filter bank is the time-frequency conversion of prototype narrow-band low-pass filter p (t); modulating the parallel summer holiday on M subbands, wherein the subband interval is delta f, and obtaining:
wherein l m [k]A true value signal modulated on the mth subband of the k time slot is represented; when the input is M a A/2 complex symbols, then
l[k]＝CPx[k]，[x[k]] m ＝C u,v,k [m],k＝1,2,…,7。
A novel wireless RA preamble design method based on pruning DFT spread FBMC and a covering sequence, the final decoding operation is obtained:
that is, the delay spread will cause the decoded sequence to shift cyclically, and the frequency offset will cause an additional frequency offset to be added to each data.
A novel wireless RA preamble system based on pruning DFT spread FBMC and coverage sequence comprises a sequence processing module, a sequence calculating module and an FBMC structure;
the sequence processing module is used for multiplying sequences with different cyclic indexes and sequences with different feedback coefficients to obtain a covering sequence with good cross correlation and autocorrelation characteristics;
the sequence calculation module is used for pruning the generated covering sequence through discrete Fourier transform and inputting the pruned covering sequence into a filter bank;
the FBMC structure is used for detecting data such as peak values or frequency offsets.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the above-mentioned method steps.
By setting a detection window, the data such as peak value, frequency offset and the like are obtained by utilizing the characteristics of the frame.
The access flow chart is shown in fig. 3;
according to the preamble design provided by the invention, the covering sequences of different root (including ZC139, 839) indexes and m-sequence feedback coefficients have good self-correlation and cross-correlation properties, as shown in FIG. 5, only when the root index, the ZC cyclic index and the feedback coefficient of the m-sequence are the same, the covering sequences can be correlated with the local root sequence to obtain a peak value, so that different UE can be effectively identified according to the preamble sequence, and larger user capacity is supported.
Compared with the conventional method which can only compensate the CFO with smaller times SCS, the method can compensate the CFO with larger times through the frame structure according to the following disclosure:
a graph of the results shown in fig. 6 can be obtained.
Claims (10)
1. A novel wireless RA lead code design method based on pruning DFT spread FBMC and a covering sequence is characterized in that the novel wireless RA lead code design method is to obtain the covering sequence; the generated covering sequence is pruned through discrete Fourier transform, input into a filter bank FBMC, and finally detected by using an FBMC structure.
2. The method of claim 1, wherein the obtaining the coverage sequence is preceded by multiplying sequences with different cyclic indices and sequences with different feedback coefficients.
3. The method as claimed in claim 2, wherein the multiplying of sequences with different cyclic indexes and sequences with different feedback coefficients is specifically,
the ZC sequence expression is as follows:
wherein N is zc Is the sequence length; u is the root index; n is the data sequence number N in the sequence c Is a cyclic shift interval;
corresponding to a sequence cyclically shifted k times;
the expression of the m sequence is:
wherein α is GF (2) m ) The primitive element of (1).
4. The method of claim 3, wherein the new wireless RA preamble design method based on pruning DFT spread FBMC and covering sequence is characterized by covering with m sequence and double-layer ZC sequence as follows:
C u,k,v,μl [n]＝[x u [n]·y μl [n]] k ·m v [n]
the resulting set is then as follows:
wherein, the first and the second end of the pipe are connected with each other,
is a characterization of a ZC set, u is a root index of a ZC139 sequence, μ is a root index of a ZC 839 sequence, k is a cyclic shift interval number index, and
5. the method as claimed in claim 4, wherein in the frame structure, the length of sequence A is 140, which is composed of cover sequences with length 139 and zero; sequence segment a is repeated three times to form a sequence of length 420, forming a preamble frame structure.
6. The method as claimed in claim 1, wherein the generated cover sequence is pruned by discrete Fourier transform, inputted into filter bank, and finally detected, specifically,
pruning the generated covering sequence, carrying out DFT precoding, inputting the result into the FBMC, and then zeroing to obtain a transmission sequence with smaller crosstalk; larger carrier offsets can be compensated for by decoding operations and using structural features of the signal frame.
7. The new wireless RA preamble design method based on pruning DFT-spread FBMC and coverage sequence as claimed in claim 6, wherein in FBMC, the filters in the filter bank are time-frequency conversion of the prototype narrowband low pass filter p (t); parallel summer holidays were modulated onto M subbands at intervals of Δ f, yielding:
wherein l m [k]Representing a true signal modulated on the mth subband of a k-slot(ii) a When the input is M a 2 complex symbols, then
l[k]＝CPx[k]，[x[k]] m ＝C u,v,k [m],k＝1,2,…,7。
8. The method of claim 7, wherein the final decoding operation results in a novel wireless RA preamble design method based on pruning DFT spread FBMC and cover sequence
The delay spread may cause cyclic shift of the decoded sequence, and the frequency offset may cause an increase in frequency offset per data.
9. The system of claim 1, wherein the system comprises a sequence processing module, a sequence calculation module, and an FBMC structure;
the sequence processing module is used for multiplying sequences with different cyclic indexes and sequences with different feedback coefficients to obtain a covering sequence;
the sequence calculation module is used for pruning the generated covering sequence through discrete Fourier transform and inputting the pruned covering sequence into a filter bank;
the FBMC structure is used to detect peak or frequency offset data.
10. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of the claims 1-8.
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