CN112769529B

CN112769529B - Random access channel receiving method, sending method and equipment

Info

Publication number: CN112769529B
Application number: CN201911061517.0A
Authority: CN
Inventors: 张鑫; 陈山枝; 任斌; 缪德山
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2022-03-29
Anticipated expiration: 2039-11-01
Also published as: CN112769529A

Abstract

The invention provides a method and a device for receiving and sending a random access channel, and relates to the technical field of communication. The method comprises the following steps: taking an Orthogonal Frequency Division Multiplexing (OFDM) symbol as a unit, carrying out multiple shifts on a received signal, and extracting multiple groups of detection signals; detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals, and acquiring a detection result of the target signal group; and acquiring a preamble sequence sent by a sending end according to the detection result of the target signal group. The scheme of the invention solves the problem that the terminal can not normally access the network because the detection and the reception of the prior preamble sequence can not be suitable for the time delay environment exceeding the CP.

Description

Random access channel receiving method, sending method and equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and a device for receiving and sending a random access channel.

Background

In a satellite communication system, due to the satellite-ground distance and the ultra-large cell radius, ultra-large time delay is introduced.

However, the conventional PRACH frame format and detection algorithm mainly address the communication requirements of the LTE system and the new air interface NR system, before transmission, a cyclic prefix CP is added in front of each preamble sequence, the supportable transmission delay is within the CP length, and the CP is smaller than an OFDM symbol, and the specific structure is shown in fig. 1. Correspondingly, the existing detection algorithm only supports the time delay within the length of the CP, and the detection performance of receiving the preamble sequence is sharply reduced in the time delay environment exceeding the CP, which directly causes that the terminal cannot normally access the network.

Disclosure of Invention

The invention aims to provide a random access channel receiving method, a random access channel sending method and a random access channel sending device, and solves the problem that the conventional preamble sequence detection and reception cannot be applied to a time delay environment exceeding a CP (content provider) and a terminal cannot normally access a network.

In order to achieve the above object, an embodiment of the present invention provides a method for receiving a random access channel, including:

taking an Orthogonal Frequency Division Multiplexing (OFDM) symbol as a unit, carrying out multiple shifts on a received signal, and extracting multiple groups of detection signals;

detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals, and acquiring a detection result of the target signal group;

and acquiring a preamble sequence sent by a sending end according to the detection result of the target signal group.

Optionally, the preamble sequence is a cyclic prefix-free preamble sequence, the length of the preamble sequence is Nzc, the preamble sequence includes N OFDM symbols, and a guard interval of the preamble sequence includes M OFDM symbols, where Nzc, N, and M are integers greater than or equal to 1.

Optionally, the shifting the received signal multiple times in units of one OFDM symbol to extract multiple groups of detection signals includes:

acquiring a receiving signal of each receiving antenna;

in the received signal, shifting one OFDM symbol from the initial position of the preamble signal to the right in sequence to obtain M +1 groups of detection signals, wherein each group of detection signals comprises signals of N OFDM symbols.

Optionally, the detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals, and acquiring a detection result of the target signal group includes:

respectively carrying out coherent or noncoherent detection on the multiple groups of detection signals to obtain the accumulated correlation value power of each group of detection signals;

and determining a target signal group in the multiple groups of detection signals according to the accumulated correlation value power of each group of detection signals, and acquiring the detection result of the target signal group.

Optionally, respectively performing incoherent detection on the multiple groups of detection signals to obtain accumulated correlation value power of each group of detection signals, including:

according to the formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Computation of local preamble sequence x and detection signal y_i,m,nCorrelation value R of_i,m,n(k) (ii) a Where i is the receiving antenna index, i is 1, …, N_r，N_rThe number of receiving antennas; m is the index of the detection signal group, M is 1, …, M + 1; n is an OFDM symbol index in each group of detection signals, and m is 1, …, N; k is a sample point index of the preamble sequence in each OFDM symbol, k is 1, …, Nzc;

according to the correlation value R_i,m,n(k) Calculating the power of the correlation value;

and accumulating and summing the correlation value power of all the antennas of each group of detection signals and all the N OFDM symbols to obtain the accumulated correlation value power of each group of detection signals.

Optionally, the performing coherent detection on the multiple groups of detection signals respectively to obtain accumulated correlation value power of each group of detection signals includes:

accumulating and summing the correlation values of all the antennas and all the N OFDM symbols of each group of detection signals;

and calculating the accumulated correlation value power of each group of detection signals.

Optionally, the determining a target signal group in the multiple groups of detection signals according to the accumulated correlation value power of each group of detection signals and obtaining a detection result of the target signal group includes:

acquiring a peak value, a peak value position and noise power of the accumulated correlation value power of each group of detection signals;

selecting one group of detection signals with the maximum peak value of the accumulated correlation value power from the plurality of groups of detection signals as an initial judgment detection signal group;

obtaining the accumulated correlation value power P of the first Q OFDM symbols of the initial judgment detection signal group₁Accumulated correlation value power P of P OFDM symbols₂Wherein the first Q OFDM symbols are Q OFDM symbols starting from the 1 st OFDM symbol, the last P OFDM symbols are P OFDM symbols with the nth OFDM symbol as a cutoff, and P, Q are integers greater than or equal to 1;

according to the peak position of the accumulated correlation value power of the initial judgment detection signal group, a first predefined threshold value and P₁And P₂Obtaining a target signal group;

and acquiring the peak value, the peak position and the noise power of the accumulated correlation value power of the target signal group.

Optionally, the determining a target signal group in the plurality of groups of detection signals according to the accumulated correlation value power includes:

selecting one group of detection signals with the maximum ratio of the peak value to the noise power in the multiple groups of detection signals as an initial judgment detection signal group;

obtaining the accumulated correlation value power P of the first Q' OFDM symbols of the initial judgment detection signal group₃And accumulated correlation value power P of P' OFDM symbols₄Wherein the first Q 'OFDM symbols are Q' OFDM symbols starting from the 1 st OFDM symbol, the last P 'OFDM symbols are P' OFDM symbols with the nth OFDM symbol as a cutoff, and P 'and Q' are integers greater than or equal to 1;

according to the peak position of the accumulated correlation value power of the initial judgment detection signal group, and the secondPredefined threshold value, P₃And P₄Obtaining a target signal group;

Optionally, the obtaining, according to the detection result of the target signal group, a preamble sequence sent by a sending end includes:

acquiring the ratio of the peak value of the accumulated correlation value power of the target signal group to the noise power;

judging according to the ratio of the peak value to the noise power and a third predefined threshold value;

confirming correct reception of a preamble sequence in case the result of the decision indicates that the ratio of the peak value to the noise power is greater than the third predefined threshold value;

and re-receiving the preamble sequence transmitted by the transmitting end under the condition that the determined result indicates that the ratio of the peak value to the noise power is less than or equal to the third predefined threshold value.

Optionally, after the confirming that the preamble sequence is correctly received, the method further includes:

according to the formula

Calculating an actual preamble sequence reception position

Wherein T is the number of sample points of the target signal group right shifted from the start position of the preamble, τ_peakA peak position of the accumulated correlation value power of the target signal group;

according to the formula

Calculating a time delay estimation value TA; wherein N is_fftIs the number of samples of one OFDM symbol.

In order to achieve the above object, an embodiment of the present invention further provides a method for sending a random access channel, including:

and sending a receiving signal corresponding to a receiving end, wherein the receiving signal comprises a preamble sequence, so that the receiving end shifts the receiving signal for multiple times by taking one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, acquires a detection result of the target signal group, and acquires the preamble sequence according to the detection result of the target signal group.

To achieve the above object, an embodiment of the present invention further provides a receiving device, including a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor; the processor implements the following steps when executing the program:

Optionally, the processor is further configured to:

acquiring a receiving signal of each receiving antenna;

Optionally, the processor is further configured to:

according to the peak position of the accumulated correlation value power of the initial judgment detection signal group, a second predefined threshold value and P₃And P₄Obtaining a target signal group;

Optionally, the processor is further configured to:

according to the formula

Calculating an actual preamble sequence reception position

according to the formula

To achieve the above object, an embodiment of the present invention further provides a transmitting device, including a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor;

the transceiver is used for sending a receiving signal corresponding to a receiving end, wherein the receiving signal includes a preamble sequence, so that the receiving end shifts the receiving signal for multiple times by taking one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, obtains a detection result of the target signal group, and obtains the preamble sequence according to the detection result of the target signal group.

In order to achieve the above object, an embodiment of the present invention further provides a random access channel receiving apparatus, including:

the first processing module is used for shifting the received signal for multiple times by taking one Orthogonal Frequency Division Multiplexing (OFDM) symbol as a unit and extracting multiple groups of detection signals;

the second processing module is used for detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals and acquiring the detection result of the target signal group;

and the third processing module is used for acquiring the preamble sequence sent by the sending end according to the detection result of the target signal group.

In order to achieve the above object, an embodiment of the present invention further provides a random access channel transmitting apparatus, including:

the receiving end is used for shifting the receiving signal for multiple times by taking one OFDM symbol as a unit, extracting multiple groups of detection signals, detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals, acquiring a detection result of the target signal group, and acquiring the preamble sequence according to the detection result of the target signal group.

To achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the random access channel receiving method as described above, or the random access channel transmitting method as described above.

The technical scheme of the invention has the following beneficial effects:

the method of the embodiment of the invention comprises the steps of firstly, taking one OFDM symbol as a unit, carrying out multiple shifts on a received signal and extracting multiple groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

Drawings

Fig. 1 is a diagram of a conventional preamble sequence;

fig. 2 is a flowchart of steps of a random access channel receiving method according to an embodiment of the present invention;

fig. 3 is an application diagram of a random access channel receiving method according to an embodiment of the present invention;

fig. 4 is a second schematic diagram of an application of the random access channel receiving method according to the embodiment of the present invention;

fig. 5 is a third schematic application diagram of a random access channel receiving method according to an embodiment of the present invention;

fig. 6 is a fourth schematic diagram illustrating an application of the random access channel receiving method according to the embodiment of the present invention;

fig. 7 is a flowchart illustrating steps of a method for transmitting a random access channel according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a transmitting device according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a random access channel receiving apparatus according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a random access channel transmitting apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

As shown in fig. 2, a method for receiving a random access channel according to an embodiment of the present invention includes:

step 201, taking an Orthogonal Frequency Division Multiplexing (OFDM) symbol as a unit, shifting a received signal for multiple times, and extracting multiple groups of detection signals;

step 202, detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals, and acquiring a detection result of the target signal group;

step 203, acquiring a preamble sequence sent by the sending end according to the detection result of the target signal group.

Through the steps, the method of the embodiment of the invention firstly uses one OFDM symbol as a unit to carry out multiple shifts on a received signal and extract a plurality of groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

It should be noted that, in this embodiment, the detection signal is obtained by performing multiple shift extraction on the received signal in units of one orthogonal frequency division multiplexing OFDM symbol, and reception is not affected by the cyclic prefix CP, so optionally, the preamble sequence is a cyclic prefix-free preamble sequence, the length of the preamble sequence is Nzc, the preamble sequence includes N OFDM symbols, and a guard interval of the preamble sequence includes M OFDM symbols, where Nzc, N, and M are integers greater than or equal to 1.

As such, the preamble format corresponding to the preamble sequence includes a CP-free preamble sequence having N OFDM symbols and a GT of the preamble sequence having M OFDM symbols.

In this embodiment, optionally, step 201 includes:

acquiring a receiving signal of each receiving antenna;

Here, first, a received signal of each receiving antenna is acquired for the receiving antenna to avoid signal omission; and then, in the acquired received signals, sequentially shifting one OFDM symbol to the right from the initial position of the preamble signal to complete the extraction of the M +1 groups of detection signals. Of course, since the preamble sequence includes N OFDM symbols, each set of detection signals also includes a signal of N OFDM symbols.

Suppose there is a total of N_rOne for each receive antenna (i.e., receive antenna 1, …, receive antenna N)_r) The received signals of (2) are subjected to extraction of the M +1 groups of detection signals. With receiving antenna i (i ═ 1, …, N)_r) For example, first, in the received signal of the receiving antenna i, the start position of the preamble signal is found, and the signals of N OFDM symbols are taken out as a group of detection signals; then, the received signal is shifted to the right by 1 OFDM symbol length, and a group of detection signals with the length of N OFDM symbols is taken out again. In the same way, up to N_rM +1 groups of detection signals are obtained from the received signals of the receiving antennas.

After acquiring the plurality of sets of detection signals, step 202 optionally includes:

In this way, for the multiple groups of detection signals obtained in step 201, the accumulated correlation value power of each group of detection signals can be obtained through coherent or non-coherent detection, so as to determine the target signal group and obtain the detection result of the target signal group.

Here, first, the formula R can be used_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Calculating a receiving-end local preamble sequence x and a detection signal y by frequency domain Fast Fourier Transform (FFT) multiplication_i,m,nCorrelation value R of_i,m,n(k) (ii) a And then further based on the correlation value R_i,m,n(k) Calculate its corresponding correlation value power, i.e. | R_i,m,n(k)|²(ii) a And then, accumulating and summing the correlation value power of all the antennas of each group of detection signals and all the N OFDM symbols to obtain the accumulated correlation value power of each group of detection signals. .

Wherein, the power of the correlation values of all the antennas and all the N OFDM symbols of each group of detection signals are accumulated and summed, and the sum can be calculated by a formula

Calculating to obtain the accumulated correlation value power P of the m-th group of detection signals_m(k)。

It should also be appreciated that, since the M +1 sets of detection signals are extracted one by one, in this embodiment, the above steps may be performed after the extraction of the plurality of sets of detection signals is completed; alternatively, after extracting a set of detection signals, such as the m-th set of detection signals, the correlation value R for the set of detection signals_i,m,n(k) Power of correlation value | R_i,m,n(k)|²And calculating, namely obtaining the correlation value and the correlation value power of each group of detection signals after the M +1 groups of detection signals are extracted, and then performing subsequent calculation.

In this embodiment, optionally, performing coherent detection on the multiple groups of detection signals respectively to obtain accumulated correlation value power of each group of detection signals includes:

according to the formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Computation of local preamble sequence x and detection signal y_i,m,nCorrelation value R of_i,m,n(k) (ii) a Where i is the receiving antenna index, i is 1, …,N_r，N_rThe number of receiving antennas; m is the index of the detection signal group, M is 1, …, M + 1; n is an OFDM symbol index in each group of detection signals, and m is 1, …, N; k is a sample point index of the preamble sequence in each OFDM symbol, k is 1, …, Nzc;

Here, first, the non-coherent detection is performed by the formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Calculating a receiving-end local preamble sequence x and a detection signal y by multiplying frequency domain FFT_i,m,nCorrelation value R of_i,m,n(k) (ii) a Then, accumulating and summing the correlation values of all the antennas and all the N OFDM symbols of each group of detection signals; and then, calculating the accumulated correlation value power of each group of detection signals.

Wherein, the correlation values of all antennas and all N OFDM symbols of each group of detection signals are accumulated and summed, and can be calculated by formula

Performing calculation to obtain the correlation value accumulated value R of the mth group of detection signals_m(k) Then by the formula P_m(k)＝|R_m(k)|²Calculating the accumulated correlation power P of each group of detection signals_m(k) I.e., the accumulated correlation value power of the mth set of detected signals.

Of course, since the M +1 sets of detection signals are extracted one by one, in this embodiment, the above steps may be performed after the extraction of the plurality of sets of detection signals is completed; alternatively, after a group of detection signals, such as the m-th group of detection signals, is extracted, the correlation value R may be performed for the group of detection signals_i,m,n(k) And calculating, namely obtaining the correlation value of each group of detection signals after the M +1 groups of detection signals are extracted, and then performing subsequent calculation.

Thus, the peak value P of the accumulated correlation value power is calculated_peakAnd peak positionτ_peakEstimating the noise power

In this embodiment, on one hand, optionally, the determining a target signal group in the multiple groups of detection signals according to the accumulated correlation value power of each group of detection signals, and obtaining the detection result of the target signal group includes:

For the obtained accumulated correlation value power of each group of detection signals, the peak value, the peak position and the noise power of the accumulated correlation value power of each group of detection signals are obtained, so that one group of detection signals with the maximum peak value in the multiple groups of detection signals is selected as an initial judgment detection signal group; then, the accumulated correlation value power P of the first Q OFDM symbols can be calculated aiming at the initial judgment detection signal group₁Accumulated correlation value power P of P OFDM symbols₂(ii) a Then, the peak position of the obtained initial judgment detection signal group, the first predefined threshold value and P are combined₁And P₂Obtaining a target signal group; finally, for this purposeAnd the marking signal group acquires the peak value, the peak position and the noise power of the accumulated correlation value power.

Specifically, the method for determining the target signal group is as follows: comparing the peak position of the preliminary judgment detection signal group with a first predefined threshold value, and if the peak position of the preliminary judgment detection signal group is smaller than the first predefined threshold value, the preliminary judgment detection signal group is a target signal group; otherwise, continuing to judge P₁＜P₂And if so, the initial judgment detection signal group is a target signal group, otherwise, the previous group of detection signals of the initial judgment detection signal group is the target signal group. Assuming that the first predefined threshold value is T₀The m-th group of detection signals is the initial judgment detection signal group, and the peak position calculated in the detection process is

If it is

The mth group of detection signals is the target signal group; otherwise, continuing to judge P₁＜P₂And if so, the m-th group of detection signals is a target signal group, otherwise, the m-1-th group of signals is the target signal group.

On the other hand, the user may, optionally,

determining a target signal group in the plurality of groups of detection signals according to the accumulated correlation value power comprises:

obtaining the accumulated correlation value power P of the first Q' OFDM symbols of the initial judgment detection signal group₃And accumulated correlation value power P of P' OFDM symbols₄Wherein the first Q 'OFDM symbols are Q' OFDM symbols starting from the 1 st OFDM symbol, and the last P 'OFDM symbols are P' OFDM symbols with the Nth OFDM symbol as a cut-offP 'and Q' are integers greater than or equal to 1;

For the obtained accumulated correlation value power of each group of detection signals, the peak value, the peak position and the noise power of the accumulated correlation value power of each group of detection signals are obtained, so that a group of detection signals with the maximum ratio is selected as an initial judgment detection signal group according to the ratio of the respective peak values and the noise powers of the multiple groups of detection signals; then, the accumulated correlation value power P of the first Q' OFDM symbols can be calculated for the initial decision detection signal group₃And accumulated correlation value power P of P' OFDM symbols₄(ii) a Then, the peak position of the obtained initial judgment detection signal group, a second predefined threshold value and P are combined₃And P₄ P_NObtaining a target signal group; finally, the peak value, the peak position and the noise power of the accumulated correlation value power of the target signal group are obtained.

The method for determining the target signal group may be similar to the above implementation method, and the peak position of the preliminary judgment detection signal group is first compared with a second predefined threshold, and if the peak position of the preliminary judgment detection signal group is smaller than the second predefined threshold, the preliminary judgment detection signal group is the target signal group; otherwise, continuing to judge P₃＜P₄And if so, the initial judgment detection signal group is a target signal group, otherwise, the previous group of detection signals of the initial judgment detection signal group is the target signal group.

In this embodiment, under the condition that the accumulated correlation value power of the known target signal group is calculated, the peak value, the peak position, and the noise power of the accumulated correlation value power are obtained, and the peak value and the peak position can be determined through calculation to estimate the noise power, which is not described herein again.

In addition, in this embodiment, optionally, step 203 includes:

In this way, after the target signal group is determined and the detection result is obtained, the ratio of the peak value of the accumulated correlation value power of the target signal group to the noise power can be obtained, and the ratio and the third predefined threshold value are further used for judgment, so that the lead code sequence is obtained according to the judgment result.

The step of obtaining the ratio of the peak value of the accumulated correlation value power to the noise power of the target signal group can be directly extracted and used for the calculated condition, and the step of obtaining the ratio of the peak value of the accumulated correlation value power to the noise power of the target signal group can be used after calculation for the non-calculated condition.

For the determined result, the correct reception of the preamble sequence sent by the sending end can be determined under the condition that the ratio of the peak value of the accumulated correlation value power of the target signal group to the noise power is greater than a third predefined threshold value; otherwise, the preamble sequence transmitted by the transmitting end needs to be re-received.

In order to make the subsequent reception of the preamble sequence more effective, in this embodiment of the present invention, after the confirming that the preamble sequence is correctly received, the method further includes:

according to the formula

Calculating an actual preamble sequence reception position

Wherein T is the number of sample points of the target signal group right shifted from the start position of the preamble, τ_peakThe peak position of the power of the correlation value after accumulating for the target signal group;

according to the formula

Thus, by the formula

Firstly, the actual receiving position of the lead code sequence is obtained through calculation

Then by the formula

And then, calculating a time delay estimation value TA, and then compensating based on the time delay estimation value TA to realize effective reception of the preamble sequence. For example, the transmitting end is informed of the TA, and adjusts the transmission of the preamble sequence based on the TA.

The application of the method of the embodiment of the present invention is described below with reference to specific scenarios:

in a scene one, a preamble sequence (preamble) in a slot is 12 OFDM symbols long, a GT is 3 OFDM symbols long, and no additional CP is provided. Delays within 3 OFDM symbols may be supported. The preamble adopts a ZC sequence with a length of 139, and has 2 receiving antennas, as shown in fig. 3:

s301: for a received signal of a receiving antenna i (i is 1, 2), a signal of 12 OFDM symbols is extracted as an m-th group detection signal (m is 1,2,3, 4). Wherein, the initial position of the preamble signal needs to be found during the first extraction, and the signals of 12 OFDM symbols are taken out with the initial position as the starting point.

S302: calculating a local preamble sequence x and a detection signal y for the mth group of detection signals extracted in S301_i,m,nCorrelation value R of_i,m,n(k) Where i (i ═ 1, 2) is a receiving antenna index, m (m ═ 1,2,3,4) is a detection signal set index, n (n ═ 1, …,12) is an OFDM symbol index in each group of detection signals, and k (k ═ 1, …,139) is a preamble sample point index in each OFDM symbol. The calculation is generally implemented by a frequency domain FFT multiplication method, such as formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Ontj (FFT (x)), FFT, followed by matched filtering, followed by inverse fast fourier transform IFFT.

S303: calculating the correlation value power | R_i,m,n(k)|²。

S304: it is determined whether 4 sets of detection signals are extracted. If 4 sets of detection signals are not extracted, S305 is executed until data of 4 sets of signals, including the correlation value R, is obtained_i,m,n(k) And correlation value power | R_i,m,n(k)|²Then S306 is executed.

S305: the received signal is shifted to the right by 1 OFDM symbol length, returning to S301. And setting one slot with 15 OFDM symbols in total, wherein the serial number is 1-15, taking the OFDM symbols with the serial numbers of 1-12 as a group of detection signals for the first time, shifting the serial number to the right by one OFDM symbol for the second time, taking the OFDM symbols with the serial numbers of 2-13 as a group of detection signals, and so on.

S306: the power of the correlation values of 2 receiving antennas and 12 OFDM symbols of each group of detection signals are accumulated and summed, and the calculation formula is as follows

S307: calculating the peak value P of the accumulated correlation value power_peakAnd peak position τ_peakEstimating the noise power

S308: comparing P of each set of detection signals_peakTaking P_akpeAnd taking the largest group of detection signals as an initial judgment detection signal group.

S309: calculating the correlation value power P of the 1 st OFDM symbol and the 12 th OFDM symbol of the initial judgment detection signal group₁And P₁₂According to the peak position of the initial judgment detection signal group and the predefined threshold value T₀Size of (1), and P₁And P₁₂And (3) judging whether the initial judgment detection signal group is a target signal group. Setting the initial judgment detection group as the m-th group of detection signals, and if the peak position of the initial judgment detection signal group is less than T₀If the m group of detection signals is the target signal group; otherwise, continuing to judge P₁＜P₁₂And if so, the m-th group of detection signals is a target signal group, otherwise, the m-1-th group of detection signals is the target signal group.

S310: for the target signal group, based on the ratio D of the peak value of the correlation value power to the noise power_corWith a predefined threshold value V₁Making a decision at D_corGreater than V₁Under the condition, determining the receiving of the lead code sequence sent by the sending end, and estimating the receiving position of the actual lead code sequence

(i.e., timer RTT timing position),

where T is the number of sample points of the target signal set right shifted from the preamble start position, i.e., (m-1) × 139, and m is the detection set index. Then, by the formula

Calculating an estimate of the time delay TA, where N_fftIs the number of samples of one OFDM symbol. If the transmission delay is 2.5 OFDM symbols, then

The unit is a sample point.

Scene two, preamble length 12 OFDM symbols in a slot, GT length 3 OFDM symbols, no extra additional CP. Delays within 3 OFDM symbols may be supported. The preamble adopts a ZC sequence with a length of 139, and has 2 receiving antennas, as shown in fig. 4:

S401-S406: the processing is performed by using S301 to S306 in the first embodiment, which is not described herein again.

S407: calculating the peak value P of the accumulated correlation value power_peakAnd peak position τ_peakEstimating the noise power

And calculate P_peakAnd

ratio D of_cor。

S408: comparing D of each set of detection signals_corTaking D_corAnd taking the largest group of detection signals as an initial judgment detection signal group.

S409: calculating the correlation value power P of the 1 st OFDM symbol and the 12 th OFDM symbol of the initial judgment detection signal group₁And P₁₂According to the peak position of the initial judgment detection signal group and the predefined threshold value T₀Size of (1), and P₁And P₁₂And (3) judging whether the initial judgment detection signal group is a target signal group. Setting the initial judgment detection group as the m-th group of detection signals, and if the peak position of the initial judgment detection signal group is less than T₀If the m group of detection signals is the target signal group; otherwise, continuing to judge P₁＜P₁₂And if so, the m-th group of detection signals is a target signal group, otherwise, the m-1-th group of detection signals is the target signal group.

S410: for the target signal group, based on the ratio D of the peak value of the correlation value power to the noise power_corWith a predefined threshold value V₁Making a decision at D_corGreater than V₁Under the condition, determining the receiving of the lead code sequence sent by the sending end, and estimating the receiving position of the actual lead code sequence

(i.e., timer RTT timing position),

The unit is a sample point.

Scene three, preamble length in a slot is 12 OFDM symbols, GT length is 3 OFDM symbols, and no additional CP is added. Delays within 3 OFDM symbols may be supported. The preamble adopts a ZC sequence with a length of 139, and has 2 receiving antennas, as shown in fig. 5:

s501: for a received signal of a receiving antenna i (i is 1, 2), a signal of 12 OFDM symbols is extracted as an m-th group detection signal (m is 1,2,3, 4). Wherein, the initial position of the preamble signal needs to be found during the first extraction, and the signals of 12 OFDM symbols are taken out with the initial position as the starting point.

S502: calculating a local preamble sequence x and a detection signal y for the mth group of detection signals extracted in S501_i,m,nCorrelation value R of_i,m,n(k) Where i (i ═ 1, 2) is a receiving antenna index, m (m ═ 1,2,3,4) is a detection signal set index, n (n ═ 1, …,12) is an OFDM symbol index in each group of detection signals, and k (k ═ 1, …,139) is a preamble sample point index in each OFDM symbol. The calculation is generally implemented by a frequency domain FFT multiplication method, such as formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n).*conj(fft(x)))。

S503: it is determined whether 4 sets of detection signals are extracted. If 4 sets of detection signals are not extracted, S504 is executed until data of 4 sets of signals, including the correlation value R, are obtained_i,m,n(k) Then S506 is performed.

S504: the received signal is shifted to the right by 1 OFDM symbol length, and the process returns to S501. And setting one slot with 15 OFDM symbols in total, wherein the serial number is 1-15, taking the OFDM symbols with the serial numbers of 1-12 as a group of detection signals for the first time, shifting the serial number to the right by one OFDM symbol for the second time, taking the OFDM symbols with the serial numbers of 2-13 as a group of detection signals, and so on.

S505: the correlation values of all antennas and 12 OFDM symbols of each group of detection signals are accumulated and summed, and the calculation formula is as follows

S506: calculating the accumulated correlation value power P of each group of detection signals_m(k)＝|R_m(k)|²。

S507: calculating the peak value P of the accumulated correlation value power_peakAnd peak position τ_peakEstimating the noise power

S508: comparing P of each set of detection signals_peakTaking P_akpeAnd taking the largest group of detection signals as an initial judgment detection signal group.

S509: calculating the correlation value power P of the 1 st OFDM symbol and the 12 th OFDM symbol of the initial judgment detection signal group₁And P₁₂According to the peak position of the initial judgment detection signal group and the predefined threshold value T₀Size of (1), and P₁And P₁₂And (3) judging whether the initial judgment detection signal group is a target signal group. Setting the initial judgment detection group as the m-th group of detection signals, and if the peak position of the initial judgment detection signal group is less than T₀If the m group of detection signals is the target signal group; otherwise, continuing to judge P₁＜P₁₂And if so, the m-th group of detection signals is a target signal group, otherwise, the m-1-th group of detection signals is the target signal group.

S510: for the target signal group, based on the ratio D of the peak value of the correlation value power to the noise power_corWith a predefined threshold value V₁Making a decision at D_corGreater than V₁Determining that the preamble sequence sent by the sending end is received under the condition,and estimates the actual preamble sequence reception position

(i.e., timer RTT timing position),

The unit is a sample point.

And in the scene four, the preamble in one slot is 12 OFDM symbols long, the GT is 3 OFDM symbols long, and no additional CP is added. Delays within 3 OFDM symbols may be supported. The preamble adopts a ZC sequence with a length of 139, and has 2 receiving antennas, as shown in fig. 6:

S601-S606: the processing is performed in S501 to S506 in the first embodiment, which is not described herein again.

S607: calculating the peak value P of the accumulated correlation value power_peakAnd peak position τ_peakEstimating the noise power

And calculate P_peakAnd

ratio D of_cor，

S608: comparing D of each set of detection signals_corTaking D_corAnd taking the largest group of detection signals as an initial judgment detection signal group.

S609: calculating the correlation value power P of the 1 st OFDM symbol and the 12 th OFDM symbol of the initial judgment detection signal group₁And P₁₂According to the peak position of the initial judgment detection signal group and the predefined threshold value T₀Size of (1), and P₁And P₁₂And (4) judging whether the initial judgment detection signal group is an optimal detection group. Setting the initial judgment detection group as the m-th group of detection signals, and if the peak position of the initial judgment detection signal group is less than T₀If the m group of detection signals is the target signal group; otherwise, continuing to judge P₁＜P₁₂And if so, the m-th group of detection signals is a target signal group, otherwise, the m-1-th group of detection signals is the target signal group.

S610: for the target signal group, based on the ratio D of the peak value of the correlation value power to the noise power_corWith a predefined threshold value V₁Making a decision at D_corGreater than V₁Under the condition, determining the receiving of the lead code sequence sent by the sending end, and estimating the receiving position of the actual lead code sequence

(i.e., timer RTT timing position),

The unit is a sample point.

In summary, in the method of the embodiment of the present invention, first, an OFDM symbol is used as a unit, and multiple groups of detection signals are extracted by shifting a received signal for multiple times; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

As shown in fig. 7, an embodiment of the present invention provides a method for sending a random access channel, including:

step 701, sending a receiving signal corresponding to a receiving end, where the receiving signal includes a preamble sequence, so that the receiving end shifts the receiving signal multiple times with one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, obtains a detection result of the target signal group, and obtains the preamble sequence according to the detection result of the target signal group.

Thus, the sending end can send a receiving signal corresponding to the receiving end, the receiving signal comprises a lead code sequence, so that the receiving end can shift the receiving signal for multiple times by taking one OFDM symbol as a unit and extract multiple groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

As shown in fig. 8, an embodiment of the present invention further provides a receiving device, which includes a transceiver 820, a memory 840, a processor 810, and a computer program stored on the memory 840 and executable on the processor 810; the processor 810, when executing the program, performs the steps of:

Optionally, the processor 810 is further configured to:

acquiring a receiving signal of each receiving antenna;

Optionally, the processor 810 is further configured to:

obtaining the accumulated correlation value power P of the first Q OFDM symbols of the initial judgment detection signal group₁Accumulated correlation value power of P OFDM symbolsP₂Wherein the first Q OFDM symbols are Q OFDM symbols starting from the 1 st OFDM symbol, the last P OFDM symbols are P OFDM symbols with the nth OFDM symbol as a cutoff, and P, Q are integers greater than or equal to 1;

Optionally, the processor 810 is further configured to:

according to the formula

Calculating an actual preamble sequence reception position

according to the formula

In FIG. 8, a bus architecture (represented by a bus), which may include any number of interconnected buses and bridges, links together various circuits including one or more processors, represented by the general purpose processor 810, and memory, represented by the memory 840. The bus may also link various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the transceiver 820. The transceiver 820 may be one element or may be multiple elements, such as multiple receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. For example: the transceiver 820 receives external data from other devices. The transceiver 820 is used for transmitting data processed by the processor 810 to other devices. Depending on the nature of the computing system, a user interface 830, such as a keypad, display, speaker, microphone, joystick, may also be provided.

The processor 810 is responsible for managing the bus and general processing, running a general-purpose operating system as previously described. And memory 840 may be used to store data used by processor 810 in performing operations.

Alternatively, processor 810 may be a CPU, ASIC, FPGA, or CPLD.

The equipment of the embodiment of the invention firstly uses an OFDM symbol as a unit to carry out multiple shifts on a received signal and extract a plurality of groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

The device provided by the embodiment of the present invention may implement the above method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.

As shown in fig. 9, an apparatus is further provided in the embodiment of the present invention, which includes a transceiver 920, a memory 930, a processor 910, and a computer program stored on the memory 930 and executable on the processor 910;

the transceiver 920 is configured to send a received signal corresponding to a receiving end, where the received signal includes a preamble sequence, so that the receiving end shifts the received signal multiple times by using one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, obtains a detection result of the target signal group, and obtains the preamble sequence according to the detection result of the target signal group.

In this way, the transmitting device can transmit a received signal corresponding to the receiving end, where the received signal includes a preamble sequence, so that the receiving end shifts the received signal multiple times by using one OFDM symbol as a unit to extract multiple groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

Since the principle of solving the problem of the device is similar to the method in the embodiment of the present invention, the implementation of the device can be referred to the implementation of the method, and the repetition points are not described again.

Wherein the transceiver 920 is configured to receive and transmit data under the control of the processor 910. In FIG. 9, the bus architecture may include any number of interconnected buses and bridges, with various circuits linking one or more processors, represented by processor 910, and memory, represented by memory 930. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 920 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 910 is responsible for managing the bus architecture and general processing, and the memory 930 may store data used by the processor 910 in performing operations.

The processor 910 is responsible for managing the bus architecture and general processing, and the memory 930 may store data used by the processor 910 in performing operations.

As shown in fig. 10, an embodiment of the present invention further provides a random access channel receiving apparatus 1000, including:

a first processing module 1010, configured to shift a received signal multiple times by using one OFDM symbol as a unit, and extract multiple groups of detection signals;

a second processing module 1020, configured to detect the multiple groups of detection signals, determine a target signal group in the multiple groups of detection signals, and obtain a detection result of the target signal group;

a third processing module 1030, configured to obtain a preamble sequence sent by a sending end according to the detection result of the target signal group.

Optionally, the first processing module 1010 includes:

a received signal acquisition submodule for acquiring a received signal of each receiving antenna;

and the first processing submodule is used for sequentially shifting one OFDM symbol to the right from the initial position of the preamble signal in the received signal to obtain M +1 groups of detection signals, wherein each group of detection signals comprises signals of N OFDM symbols.

Optionally, the second processing module 1020 includes:

the second processing submodule is used for respectively carrying out coherent or noncoherent detection on the multiple groups of detection signals to obtain the accumulated correlation value power of each group of detection signals;

and the third processing submodule is used for determining a target signal group in the multiple groups of detection signals according to the accumulated correlation value power of each group of detection signals and acquiring the detection result of the target signal group.

Optionally, the second processing sub-module includes:

a first calculation unit for calculating R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Computation of local preamble sequence x and detection signal y_i,m,nCorrelation value R of_i,m,n(k) (ii) a Where i is the receiving antenna index, i is 1, …, N_r，N_rThe number of receiving antennas; m is the index of the detection signal group, M is 1, …, M + 1; n is an OFDM symbol index in each group of detection signals, and m is 1, …, N; k is a sample point index of the preamble sequence in each OFDM symbol, k is 1, …, Nzc;

a second calculation unit for calculating a correlation value R based on the correlation value R_i,m,n(k) Calculating the power of the correlation value;

and the third calculating unit is used for accumulating and summing the correlation value power of all the antennas and all the N OFDM symbols of each group of detection signals to obtain the accumulated correlation value power of each group of detection signals.

Optionally, the second processing sub-module includes:

a fourth calculation unit for calculating R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Computation of local preamble sequence x and detection signal y_i,m,nCorrelation value R of_i,m,n(k) (ii) a Where i is the receiving antenna index, i is 1, …, N_r，N_rThe number of receiving antennas; m is the index of the detection signal group, M is 1, …, M + 1; n is an OFDM symbol index in each group of detection signals, and m is 1, …, N; k is a sample point index of the preamble sequence in each OFDM symbol, k is 1, …, Nzc;

a fifth calculation submodule, configured to accumulate and sum correlation values of all antennas and all N OFDM symbols of each group of detection signals;

and the sixth calculating submodule is used for calculating the accumulated correlation value power of each group of detection signals.

Optionally, the third processing sub-module includes:

the first acquisition unit is used for acquiring the peak value, the peak position and the noise power of the accumulated correlation value power of each group of detection signals;

a first selecting unit, configured to select a group of detection signals with a maximum peak value of the accumulated correlation power among the plurality of groups of detection signals as an initial determination detection signal group;

a second obtaining unit, configured to obtain cumulative correlation value power P of the first Q OFDM symbols of the initial decision detection signal group₁Accumulated correlation value power P of P OFDM symbols₂Wherein the first Q OFDM symbols are Q OFDM symbols starting from the 1 st OFDM symbol, the last P OFDM symbols are P OFDM symbols with the nth OFDM symbol as a cutoff, and P, Q are integers greater than or equal to 1;

a first processing unit for processing the accumulated correlation power peak position, a first predefined threshold value and P according to the initial judgment detection signal group₁And P₂Obtaining a target signal group;

and the third acquisition unit is used for acquiring the peak value, the peak position and the noise power of the accumulated correlation value power of the target signal group.

Optionally, the third processing sub-module includes:

a fourth obtaining unit, configured to obtain a peak value, a peak position, and a noise power of the accumulated correlation value power of each group of detection signals;

a second selecting unit, configured to select a group of detection signals with a largest ratio between the peak value and the noise power among the plurality of groups of detection signals as an initial determination detection signal group;

a fifth obtaining unit, configured to obtain cumulative correlation value power P of the first Q' OFDM symbols of the initial decision detection signal group₃And accumulated correlation value power P of P' OFDM symbols₄Wherein the first Q 'OFDM symbols are Q' OFDM symbols starting from the 1 st OFDM symbol, the last P 'OFDM symbols are P' OFDM symbols with the nth OFDM symbol as a cutoff, and P 'and Q' are integers greater than or equal to 1;

a second processing unit for processing the accumulated correlation power peak position, a second predefined threshold value and P according to the initial judgment detection signal group₃And P₄Obtaining a target signal group;

and the sixth acquisition unit is used for acquiring the peak value, the peak position and the noise power of the accumulated correlation value power of the target signal group.

Optionally, the third processing module 1030 includes:

the ratio acquisition submodule is used for acquiring the ratio of the peak value of the accumulated correlation value power of the target signal group to the noise power;

the fourth processing submodule is used for judging according to the ratio of the peak value to the noise power and a third predefined threshold value;

a fifth processing sub-module, configured to, when the result of the determination indicates that the ratio of the peak value to the noise power is greater than the third predefined threshold value, confirm that the preamble sequence is correctly received;

and a sixth processing sub-module, configured to re-receive the preamble sequence sent by the sending end when the determined result indicates that the ratio of the peak value to the noise power is smaller than or equal to the third predefined threshold.

Optionally, the apparatus further comprises:

a first calculation module for calculating according to a formula

Calculating an actual preamble sequence reception position

a second calculation module for calculating according to a formula

The device firstly uses an OFDM symbol as a unit to shift a received signal for multiple times and extract a plurality of groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

It should be noted that the apparatus is an apparatus to which the random access channel receiving method is applied, and the implementation manner of the embodiment of the random access channel receiving method is applied to the apparatus, and the same technical effect can be achieved.

As shown in fig. 11, an embodiment of the present invention further provides a random access channel transmitting apparatus 1100, including:

a sending module 1110, configured to send a received signal corresponding to a receiving end, where the received signal includes a preamble sequence, so that the receiving end shifts the received signal multiple times using one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, obtains a detection result of the target signal group, and obtains the preamble sequence according to the detection result of the target signal group.

The device can send a receiving signal corresponding to a receiving end, wherein the receiving signal comprises a lead code sequence, so that the receiving end can shift the receiving signal for multiple times by taking one OFDM symbol as a unit and extract multiple groups of detection signals; then, respectively detecting the extracted multiple groups of detection signals, determining a target signal group according to the detection results, and acquiring the detection results of the target signal group; and acquiring a preamble sequence transmitted by a transmitting end according to the detection result of the target signal group. Therefore, even if the time delay exceeds one OFDM symbol, the correct preamble sequence can be found through the shift detection, so that the problem that the preamble sequence cannot be normally detected due to the fact that the detection signal exceeds the window is avoided, and the terminal is ensured to be normally accessed into the network.

The apparatus is an apparatus to which the random access channel transmission method is applied, and the implementation of the embodiment of the random access channel transmission method is applied to the apparatus, and the same technical effects can be achieved.

Another embodiment of the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the random access channel receiving method as described above, or the random access channel transmitting method as described above.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It is further noted that many of the functional units described in this specification have been labeled as modules, in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of existing hardware technology, a module implemented by software may build a corresponding hardware circuit to implement a corresponding function, without considering cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

The exemplary embodiments described above are described with reference to the drawings, and many different forms and embodiments of the invention may be made without departing from the spirit and teaching of the invention, therefore, the invention is not to be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of elements may be exaggerated for clarity. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. 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. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Unless otherwise indicated, a range of values, when stated, includes the upper and lower limits of the range and any subranges therebetween.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A random access channel receiving method, comprising:

acquiring a preamble sequence sent by a sending end according to the detection result of the target signal group;

the preamble sequence is a preamble sequence without a cyclic prefix, the length of the preamble sequence is Nzc, the preamble sequence includes N OFDM symbols, and a guard interval of the preamble sequence includes M OFDM symbols, where Nzc, N, and M are integers greater than or equal to 1;

the plurality of sets of detection signals includes M +1 sets of detection signals.

2. The method of claim 1, wherein the shifting the received signal multiple times in units of one OFDM symbol to extract multiple groups of detection signals comprises:

acquiring a receiving signal of each receiving antenna;

3. The method of claim 1, wherein the detecting the plurality of sets of detection signals, determining a set of target signals in the plurality of sets of detection signals, and obtaining the detection result of the set of target signals comprises:

4. The method of claim 3, wherein performing non-coherent detection on the plurality of groups of detection signals to obtain accumulated correlation power of each group of detection signals comprises:

according to the formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Computation of local preamble sequence x and detection signal y_i,m,nCorrelation value R of_i,m,n(k) (ii) a Where i is the receiving antenna index, i is 1, …, N_r，N_rThe number of receiving antennas; m is the index of the detection signal group, M is 1, …, M + 1; n is an OFDM symbol index in each group of detection signals, and N is 1, …, N; k is a sample point index of the preamble sequence in each OFDM symbol, k is 1, …, Nzc;

according to the correlation value R_i,m,n(k) Calculating the phasesOff value power;

5. The method of claim 3, wherein performing coherent detection on the plurality of groups of detection signals to obtain accumulated correlation power of each group of detection signals comprises:

6. The method of claim 4 or 5, wherein the determining a target signal group of the plurality of detection signals according to the accumulated correlation value power of each detection signal group and obtaining the detection result of the target signal group comprises:

obtaining the accumulated correlation value power P of the first Q OFDM symbols of the initial judgment detection signal group₁Accumulated correlation value power P of P OFDM symbols₂Wherein the first Q OFDM symbols are Q OFDM symbols starting from the 1 st OFDM symbol, and the last P OFDM symbolsThe OFDM symbols are P OFDM symbols with the Nth OFDM symbol as a cutoff, and P, Q are integers which are greater than or equal to 1;

7. The method of claim 4 or 5, wherein determining the target signal group of the plurality of detection signals according to the accumulated correlation value power comprises:

8. The method of claim 3, wherein the obtaining the preamble sequence sent by the sending end according to the detection result of the target signal group comprises:

9. The method of claim 8, further comprising, after the confirming correct receipt of the preamble sequence:

according to the formula

Calculating an actual preamble sequence reception position

according to the formula

10. A method for transmitting a random access channel, comprising:

sending a receiving signal corresponding to a receiving end, wherein the receiving signal comprises a preamble sequence, so that the receiving end shifts the receiving signal for multiple times by taking one OFDM symbol as a unit, extracting multiple groups of detection signals, detecting the multiple groups of detection signals, determining a target signal group in the multiple groups of detection signals, acquiring a detection result of the target signal group, and acquiring the preamble sequence according to the detection result of the target signal group;

11. A receiving device comprising a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

12. The device of claim 11, wherein the processor is further configured to:

acquiring a receiving signal of each receiving antenna;

13. The device of claim 12, wherein the processor is further configured to:

14. The device of claim 13, wherein the processor is further configured to:

15. The device of claim 13, wherein the processor is further configured to:

according to the formula R_i,m,n(k)＝corr(y_i,m,n,x)＝ifft(fft(y_i,m,n) Computation of local preamble sequence x and detection signal y_i,m,nCorrelation value R of_i,m,n(k) (ii) a Where i is the receiving antenna index, i is 1, …, N_r，N_rThe number of receiving antennas; m is a detection signal groupIndex, M ═ 1, …, M + 1; n is an OFDM symbol index in each group of detection signals, and N is 1, …, N; k is a sample point index of the preamble sequence in each OFDM symbol, k is 1, …, Nzc;

16. The apparatus of claim 14 or 15, wherein the processor is further configured to:

17. The apparatus of claim 14 or 15, wherein the processor is further configured to:

obtaining the initial judgment detection signalAccumulated correlation power P of the first Q' OFDM symbols of a group₃And accumulated correlation value power P of P' OFDM symbols₄Wherein the first Q 'OFDM symbols are Q' OFDM symbols starting from the 1 st OFDM symbol, the last P 'OFDM symbols are P' OFDM symbols with the nth OFDM symbol as a cutoff, and P 'and Q' are integers greater than or equal to 1;

18. The device of claim 13, wherein the processor is further configured to:

19. The device of claim 18, wherein the processor is further configured to:

according to the formula

Calculating an actual preamble sequence reception position

Wherein T is the target signal group from the preambleNumber of sample points, tau, shifted to the right from the starting position_peakA peak position of the accumulated correlation value power of the target signal group;

according to the formula

20. A transmitting device comprising a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,

the transceiver is used for transmitting a receiving signal corresponding to a receiving end, wherein the receiving signal comprises a preamble sequence, so that the receiving end shifts the receiving signal for multiple times by taking one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, acquires a detection result of the target signal group, and acquires the preamble sequence according to the detection result of the target signal group;

21. A random access channel receiving apparatus, comprising:

the third processing module is used for acquiring a preamble sequence sent by a sending end according to the detection result of the target signal group;

22. A random access channel transmission apparatus, comprising:

a sending module, configured to send a received signal corresponding to a receiving end, where the received signal includes a preamble sequence, so that the receiving end shifts the received signal multiple times with one OFDM symbol as a unit, extracts multiple groups of detection signals, detects the multiple groups of detection signals, determines a target signal group in the multiple groups of detection signals, obtains a detection result of the target signal group, and obtains the preamble sequence according to the detection result of the target signal group;

23. A computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the random access channel receiving method of any one of claims 1 to 9 or the random access channel transmitting method of claim 10.