A signal receiving method under single interference suppression suitable for OFDM system

Abstract

The application provides a signal receiving method under single interference suppression suitable for OFDM system, which comprises the following steps: calculating the relative least square estimation result of the interference signal channel of the receiving antenna, carrying out time domain combination, combination and IFFT transformation, using the denoising filter processing result of the transformed equivalent time domain impulse response result to carry out FFT transformation, calculating the relative least square estimation result of the effective signal channel and carrying out frequency offset estimation; then carrying out time domain combination to complete the denoising, calculating the noise power of the time domain impulse response after IFFT transformation, searching the multi-path time delay expansion range and the time delay corresponding to the strongest transmission path, carrying out denoising filter processing, carrying out FFT transformation and using interpolation to obtain the final effective signal channel estimation result, and then recovering the receiving signal through equalization processing. The application can realize signal receiving under the conditions of line-of-sight propagation channel and single wideband interference source with low complexity under the configuration of conventional multi-antenna without large-scale antenna array.

Description

Technical Field

[0001] This invention relates to the field of channel estimation and channel equalization technology on the receiver side of OFDM systems defined by the NR (New Radio) standard in the field of wireless communication. Specifically, it relates to a signal reception method suitable for OFDM systems under single interference suppression. Background Technology

[0002] In the physical layer of current NR systems, signal reception is mostly based on MMSE equalization using accurate channel estimation results. The typical processing procedure is as follows: Step 1: Calculate the effective signal channel relative LS estimation result after interference cancellation, as shown in the following formula:

[0003] Step 2: Estimate the frequency offset using the phase difference between OFDM symbols, as shown in the following formula:

[0004] Step 3: Perform temporal merging to complete noise reduction, as shown in the following formula:

[0005] Step 4: Proceed N FFT / D RS The point IFFT transform is used to obtain the time-domain impulse response of the effective signal channel relative estimation result, as shown in the following equation:

[0006] Step 5: Calculate the interference noise power, as shown in the following formula:

[0007] Step 6: Search for the multipath delay extension range and the delay corresponding to the strongest transmission path, as shown below.

[0008] Step 7: Use a rectangular window for noise reduction filtering, as shown in the following formula:

[0009] Step 8: Proceed N FFT / D RS The point-wise FFT transform recovers the relative estimation result of the interference signal channel after time-domain denoising, and only the first part is truncated. N SC / DRS One valid result is shown in the following formula.

[0010] Step 9: Use interpolation to obtain the channel estimation result of the final effective signal, as shown in the following formula:

[0011] Step 10: Perform equalization processing to recover the received signal, as shown in the following formula:

[0012] The meanings of the relevant symbols in the above process are as follows: N RX Indicates the number of receive antennas in an OFDM system; N FFT This indicates the number of FFT / IFFT transform points in the OFDM system; N CP Indicates the number of cyclic prefix points in the OFDM system; N SYM This indicates the number of OFDM symbols contained in a single time slot in an OFDM system; N RS_SYM This indicates the number of OFDM symbols carrying reference signals contained in a single time slot in an OFDM system; N DATA_SYM This indicates the number of OFDM symbols carrying data signals contained in a single time slot in an OFDM system; S RS ( l ) represents the first time slot in a single time slot l The sequence number of an OFDM symbol carrying a reference signal, where 0 ≤ l < N RS_SYM ; S DATA ( l ) represents the first time slot in a single time slot l The sequence number of an OFDM symbol carrying a data signal, where 0 ≤ l < N DATA_SYM ; N SC This indicates the number of subcarriers used to carry valid signals in an OFDM system, and it is set that the system only occupies 0~ NSC -1 is used to carry valid signals; D RS The interval representing the frequency domain distribution of the reference signal in an OFDM system; k 0 indicates the offset of the frequency domain distribution of the reference signal in the OFDM system; N SC This indicates the number of subcarriers used to carry valid signals in an OFDM system. N SC ≤ N FFT ; R p ( l , k ) indicates the first p The first receiving antenna l On the OFDM symbol, the first k Frequency domain received signal on each subcarrier, where 0 ≤ p < N RX , 0≤ k < N SC , 0≤ k < N SC , 0≤ l < N SYM ; Indicates the valid signal number 1 p The first receiving antenna l The first OFDM symbol containing DMRS on k One LS estimation result; α FO This represents the normalized frequency offset estimation result, in units of subcarrier spacing; C FO ( l ) indicates the first l The OFDM symbol containing DMRS and the first l +1 related value of OFDM symbol containing DMRS; This indicates the first time-domain merge and combination after time-domain merging. p The first receiving antenna k The relative LS estimation results of the valid signals; Indicates the th after time-domain transformation. p The first on the root receiving antennan The time-domain transformation result of the channel corresponding to each valid signal is approximately equivalent to the time-domain impulse response of the channel corresponding to the interference signal. Indicates the first p The noise power of the root receiving antenna; or THR Indicates the relative decision threshold for searching the transmission path; , and They represent the first p The root receiving antenna corresponds to the minimum delay, maximum delay, and strongest transmission path delay; Indicates the number after filtering. p The first on the root receiving antenna n The time-domain transformation result of the channel corresponding to each valid signal is approximately equivalent to the time-domain impulse response of the channel corresponding to the interference signal. Indicates the first p The first point recovered after FFT processing on the root receiving antenna k Channel estimation results; Indicates the first p The first receiving antenna k Channel estimation results on each subcarrier; Indicates the first p The window width for adaptive smooth interpolation on the root receiving antenna; or SMOOTH This represents the threshold for calculating the width of the adaptive smooth interpolation window based on multipath delay spread.

[0013] It is evident that the final core processing requires the channel estimation results ( Sufficiently accurate, and with sufficient interference noise power. The interference level should not be too high. Under interference suppression conditions, this is clearly difficult to achieve. For the former, conventional channel estimation obtains accurate results through interference whitening (as in Step 1 above) and filtering-based noise reduction (as in Step 7 above). This method can resist interference with a signal-to-interference ratio (SNR) of mostly below 10 dB. For interference suppression scenarios with an SNR greater than 20 dB, it is practically impossible to function properly. For the latter, the above process offers no solution. Current approaches mostly utilize antenna arrays for beam nulling to achieve interference suppression, but this is complex and has high hardware costs. Summary of the Invention

[0014] The present invention aims to provide a signal reception method suitable for OFDM systems under single interference suppression, in order to solve the problem that conventional reception schemes are difficult to accurately estimate and equalize the channel under strong interference suppression conditions, which leads to a sharp decline in system performance or even paralysis.

[0015] This invention provides a signal reception method for single-interference suppression in OFDM systems, comprising: Calculate the relative least squares estimation results of the interference signal channel of the receiving antenna; The relative least squares estimation results are used for temporal merging and combination to obtain the noise reduction result; The noise reduction result is subjected to IFFT transformation to obtain the equivalent time-domain impulse response result of the interference signal channel; Using the equivalent time-domain impulse response results, a rectangular window is used for the first noise reduction filtering process; The first noise reduction and filtering result is subjected to FFT transformation to recover the relative estimation result of the first interference signal channel after time-domain noise reduction; The relative least squares estimation result of the effective signal channel after interference elimination is calculated using the first interference signal channel relative estimation result. Based on the relative least squares estimation results of the effective signal channel, frequency offset is estimated using the phase difference between OFDM symbols to obtain the normalized frequency offset result; Noise reduction is achieved by using the normalized frequency offset results for time-domain merging, resulting in the time-domain merged noise reduction result. An IFFT transform is performed on the time-domain merging and denoising results to obtain the time-domain impulse response of the effective signal channel relative estimation results; Noise power is calculated using the time-domain impulse response based on the relative estimation results of the effective signal channel; Using the time-domain impulse response and noise power of the effective signal channel relative estimation results, we search for the multipath delay extension range and the delay corresponding to the strongest transmission path; Based on the multipath delay extension range and the delay corresponding to the strongest transmission path, a rectangular window is used for the second noise reduction filtering process. The second noise reduction filtering result is subjected to FFT transformation to recover the relative estimation result of the second interference signal channel after time-domain noise reduction; Interpolation is used to obtain the final effective signal channel estimation result from the relative estimation result of the second interference signal channel. The received signal is recovered by equalization processing of the final effective signal channel estimation results.

[0016] In a preferred embodiment, the relative least squares estimation results of the interference signal channel for the other receiving antennas are calculated based on the 0th receiving antenna; p The first receiving antenna lOn the OFDM symbol containing DMRS, based on the first k The first group of idle resource particles measured k The relative least squares estimation results are denoted as , is represented as:

[0017] in: R p ( l , k ) indicates the first p The first receiving antenna l On the OFDM symbol, the first k Frequency domain received signal on each subcarrier; S RS ( l ) represents the first time slot in a single time slot l The serial number of an OFDM symbol carrying a reference signal; D RS The interval representing the frequency domain distribution of the reference signal in an OFDM system; P min_NOISE This indicates the preset minimum noise floor power; N RX Indicates the number of receive antennas in an OFDM system; N RS_SYM This indicates the number of OFDM symbols carrying reference signals contained in a single time slot in an OFDM system; N SC This indicates the number of subcarriers used to carry valid signals in an OFDM system; k 0 indicates the offset of the frequency domain distribution of the reference signal in the OFDM system.

[0018] In a preferred embodiment, the first k The noise reduction result is denoted as , is represented as:

[0019] Each receiving antenna, except for the 0th receiving antenna, can obtain... N SC / D RS One noise reduction result.

[0020] In a preferred embodiment, the first p The first on the root receiving antennan The equivalent time-domain impulse response results are denoted as follows: , is represented as:

[0021] Each receiving antenna, except for the 0th receiving antenna, can obtain N FFT / D RS One equivalent time-domain impulse response result; N FFT This indicates the number of Fast Fourier Transform points in the OFDM system; N FFT / D RS The number of points for the Fast Inverse Fourier Transform.

[0022] In a preferred embodiment, the result of the first noise reduction filtering process is denoted as... , is represented as:

[0023] in: t L This represents the forward delay spread of the main path of the channel corresponding to the interference signal; t R This represents the backward delay spread of the main path of the channel corresponding to the interference signal.

[0024] In a preferred embodiment, the relative estimation result of the first interference signal channel is expressed as:

[0025] in, Indicates the first p Root receiving antenna k The relative estimation results of the interference signal channels.

[0026] In a preferred embodiment, the first l On the OFDM symbol containing DMRS, the first p Root receiving antenna k The relative least squares estimation results of the effective signal channels are denoted as follows: , is represented as:

[0027] in: X RS ( l , k ) indicates the firstl On the OFDM symbol containing DMRS, the first k One reference signal.

[0028] In a preferred embodiment, the normalized frequency offset result is denoted as α FO Represented as:

[0029] in, C FO ( l ) indicates the first l The OFDM symbol containing DMRS and the first l +1 related values ​​for OFDM symbols containing DMRS.

[0030] In a preferred embodiment, the time-domain merging and denoising result is expressed as:

[0031] in, Indicates the first p The first receiving antenna k The result of time-domain merging and noise reduction.

[0032] In a preferred embodiment, the time-domain impulse response of the relative estimation result of the effective signal channel is expressed as:

[0033] in, Indicates the first p The first on the root receiving antenna n The time-domain impulse response of the relative estimation results of each effective signal channel.

[0034] In a preferred embodiment, the noise power is expressed as: Represented as:

[0035] in: Indicates the first p The noise power of the root receiving antenna; M NI This represents the number of points in the time-domain impulse response required to calculate the noise power.

[0036] In a preferred embodiment, the first p The multipath delay spread range corresponding to the root receiving antenna and the delay corresponding to the strongest transmission path are denoted as follows: and , is represented as:

[0037] in: t max Indicates the maximum multipath delay; t min Indicates the minimum multipath delay; t 0 indicates the strongest path delay; or THR This represents the relative decision threshold for searching transmission paths.

[0038] In a preferred embodiment, the result of the second noise reduction filtering process is expressed as follows:

[0039] in, Indicates the first p The first on the root receiving antenna n The result of the second noise reduction filtering process.

[0040] In a preferred embodiment, the relative estimation result of the second interference signal channel is expressed as follows:

[0041] in, Indicates the first p Root receiving antenna k The relative estimation results of the second interference signal channel.

[0042] In a preferred embodiment, the final effective signal channel estimation result is expressed as:

[0043] in: Indicates the first p Root receiving antenna k One final effective signal channel estimation result; M SMOOTH This represents the window width for adaptive smooth interpolation; or SMOOTH This represents the threshold for calculating the width of the adaptive smooth interpolation window based on multipath delay spread.

[0044] In a preferred embodiment, the received signal is represented as:

[0045] in: Y( S DATA ( l ), k ) indicates the first k One received signal; S DATA ( l ) represents the first time slot in a single time slot l The sequence number of an OFDM symbol carrying a data signal; N DATA_SYM This indicates the number of OFDM symbols carrying data signals contained in a single time slot in an OFDM system.

[0046] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention eliminates the need for large-scale antenna arrays, enabling signal reception with low complexity under conventional multi-antenna configurations in line-of-sight (LOS) channels and with a single broadband interference source. Example 4 demonstrates that the received signal can be correctly resolved at an interference-to-signal ratio of -25 dB under receiving antenna conditions. Furthermore, this invention can be directly coupled to the channel equalization module of an NR system receiver, unaffected by the Doppler effect and requiring no prior knowledge of the interference waveform. Attached Figure Description

[0047] Figure 1 This invention provides a flowchart of a signal reception method for single interference suppression in an OFDM system, as described in an embodiment of the present invention.

[0048] Figure 2 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] For ease of description in this embodiment of the invention, the following parameter meanings are defined: N RX Indicates the number of receive antennas in an OFDM system; N FFT This indicates the number of points in the Fast Fourier Transform (FFT) / Inverse Fast Fourier Transform (IFFT) of the OFDM system. N CP Indicates the number of cyclic prefix points in the OFDM system; N SYM This indicates the number of OFDM symbols contained in a single time slot in an OFDM system; N RS_SYM This indicates the number of OFDM symbols carrying reference signals contained in a single time slot in an OFDM system; N DATA_SYM This indicates the number of OFDM symbols carrying data signals contained in a single time slot in an OFDM system; S RS ( l ) represents the first time slot in a single time slot l The sequence number of an OFDM symbol carrying a reference signal, where 0 ≤ l < N RS_SYM ; S DATA ( l ) represents the first time slot in a single time slot l The sequence number of an OFDM symbol carrying a data signal, where 0 ≤ l < N DATA_SYM ; N SC This indicates the number of subcarriers used to carry valid signals in an OFDM system, and it is set that the system only occupies 0~ N SC -1 is used to carry valid signals; D RS The interval representing the frequency domain distribution of the reference signal in an OFDM system; k 0 indicates the offset of the frequency domain distribution of the reference signal in the OFDM system; N SCThis indicates the number of subcarriers used to carry valid signals in an OFDM system. N SC ≤ N FFT R p ( l , k ) indicates the first p The first receiving antenna l On the OFDM symbol, the first k Frequency domain received signal on each subcarrier, where 0 ≤ p < N RX , 0≤ k < N SC , 0≤ k < N SC , 0≤ l < N SYM ; P min_NOISE This indicates the preset minimum noise floor power; Indicates the first p The first receiving antenna l On the OFDM symbol containing DMRS, based on the first k The first group of idle resource elements (REs) measured the... k The relative least squares estimation results of the interference signals.

[0052] This indicates the first time-domain merge and combination after time-domain merging. p The first receiving antenna k The relative least squares estimation results of the interference signals; Indicates the th after time-domain transformation. p The first on the root receiving antenna n The time-domain transformation result of the channel corresponding to the interference signal is approximately equivalent to the time-domain impulse response of the channel corresponding to the interference signal. t L and t R These represent the forward and backward delay spread values ​​of the main path of the channel corresponding to the interference signal, respectively. Indicates the number after filtering. p The first on the root receiving antenna nThe time-domain transformation result of the channel corresponding to the interference signal is approximately equivalent to the time-domain impulse response of the channel corresponding to the interference signal. The channel corresponding to the interference signal is the first p The first on the root receiving antenna k Frequency domain estimation results; Indicates the valid signal number 1 p The first receiving antenna l The first OFDM symbol containing DMRS on k One least squares estimation result; X RS ( l , k ) indicates the first l On the OFDM symbol containing DMRS, the first k One reference signal; α FO This represents the normalized frequency offset result, in units of subcarrier spacing. C FO ( l ) indicates the first l The OFDM symbol containing DMRS and the first l +1 related values ​​for OFDM symbols containing DMRS; This indicates the first time-domain merge and combination after time-domain merging. p The first receiving antenna k The relative least squares estimation results of the effective signals; Indicates the th after time-domain transformation. p The first on the root receiving antenna n The time-domain transformation result of the channel corresponding to each valid signal is approximately equivalent to the time-domain impulse response of the channel corresponding to the interference signal. Indicates the first p The noise power of the root receiving antenna; M NI This represents the number of points in the time-domain impulse response required to calculate the noise power; or THR Indicates the relative decision threshold for searching the transmission path; , and They represent the first p The root receiving antenna corresponds to the minimum delay, maximum delay, and strongest transmission path delay; Indicates the number after filtering. p The first on the root receiving antenna n The time-domain transformation result of the channel corresponding to each valid signal is approximately equivalent to the time-domain impulse response of the channel corresponding to the interference signal. Indicates the first p The first point recovered after FFT processing on the root receiving antenna k Channel estimation results; Indicates the first p The first receiving antenna k Channel estimation results on each subcarrier; Indicates the first p The width of the smoothing filter window on the root receiving antenna; or SMOOTH This represents the threshold for calculating the width of the smoothing filter window based on multipath delay spread.

[0053] like Figure 1 As shown, this embodiment of the invention provides a signal reception method under single interference suppression suitable for OFDM systems, comprising the following steps: Step 1: Calculate the relative least squares estimation result of the interference signal channel of the receiving antenna.

[0054] Using the 0th receiving antenna as a reference, calculate the relative least squares estimation results of the interference signal channel for the other receiving antennas. p The first receiving antenna l On the OFDM symbol containing DMRS, based on the first k The first group of idle resource particles measured k The relative least squares estimation results are denoted as , represented as:

[0055] Step 2: Use the relative least squares estimation results to perform temporal merging and combination to obtain the noise reduction result.

[0056] Every receiving antenna except the 0th receiving antenna can obtain N SC / D RS The processing result, of which the first... k The noise reduction result is denoted as , represented as:

[0057] Step 3: Perform IFFT transformation on the noise reduction result to obtain the equivalent time-domain impulse response result of the interference signal channel.

[0058] The number of points in the fast inverse Fourier transform is N FFT / D RS Except for the 0th receiving antenna, each receiving antenna can obtain N FFT / D RS The equivalent time-domain impulse response results, of which the first... p The first on the root receiving antenna n The equivalent time-domain impulse response results are denoted as follows: , represented as:

[0059] Step 4: Using the equivalent time-domain impulse response results, perform the first noise reduction filtering process using a rectangular window.

[0060] Every receiving antenna except the 0th receiving antenna can obtain N FFT / D RS The first noise reduction filtering result, where the first... p The first on the root receiving antenna n The result of the first noise reduction filtering process is denoted as , represented as:

[0061] Step 5: Perform an FFT transform on the first noise reduction and filtering result to recover the relative estimation result of the first interference signal channel after time-domain noise reduction.

[0062] The number of FFT transformation points is N FFT / D RS For the recovered time-domain denoised first interference signal channel relative estimation result, only the first part is truncated. N SC / D RS This yields a valid result, meaning that every receiving antenna except the 0th receiving antenna can obtain [the desired result]. N SC / D RS The first relative estimation result of the interference signal channel, the second p Root receiving antenna k The relative estimation result of the first interference signal channel is denoted as , represented as:

[0063] Step 6: Calculate the relative least squares estimation result of the effective signal channel after interference elimination using the first interference signal channel relative estimation result.

[0064] Except for the 0th receiving antenna, each receiving antenna on every OFDM symbol containing DMRS can obtain N SC / D RS The relative least squares estimation results of the effective signal channel, the th l On the OFDM symbol containing DMRS, the first p Root receiving antenna k The relative least squares estimation results of the effective signal channels are denoted as follows: , represented as:

[0065] Step 7: Based on the relative least squares estimation results of the effective signal channel, frequency offset is estimated using the phase difference between OFDM symbols to obtain the normalized frequency offset result (unit: subcarrier spacing).

[0066] The normalized frequency offset result is denoted as α FO Represented as:

[0067] Step 8: Use the normalized frequency offset result to perform time-domain merging to complete the noise reduction and obtain the time-domain merging noise reduction result.

[0068] Every receiving antenna except the 0th receiving antenna can obtain N SC / D RS The first time-domain merging and denoising result, the th p The first receiving antenna k The time-domain merging and noise reduction results are denoted as follows: , represented as:

[0069] Step 9: Perform IFFT transform on the time-domain merging and denoising results to obtain the time-domain impulse response of the effective signal channel relative estimation results; The number of points in the IFFT transform is N FFT / D RS Except for the 0th receiving antenna, each receiving antenna can obtain N FFT / DRS The time-domain impulse response of the relative estimation results of the effective signal channel, where the th effective signal channel is... p The first on the root receiving antenna n The time-domain impulse response of the relative estimation results of the effective signal channels is denoted as: , represented as:

[0070] Step 10: Calculate the noise power using the time-domain impulse response of the relative estimation results of the effective signal channel.

[0071] Except for the 0th receiving antenna, each receiving antenna can obtain 1 noise power, of which the 0th antenna... p The noise power of the root receiving antenna is denoted as , represented as:

[0072] Step 11: Using the time-domain impulse response and noise power of the effective signal channel relative estimation results, search for the multipath delay extension range and the delay corresponding to the strongest transmission path.

[0073] Except for the 0th receiving antenna, each receiving antenna can obtain the corresponding processing result, among which the 0th receiving antenna... p The multipath delay spread range corresponding to the root receiving antenna and the delay corresponding to the strongest transmission path are denoted as follows: and , represented as:

[0074] Step 12: Based on the multipath delay extension range and the delay corresponding to the strongest transmission path, a rectangular window is used for the second noise reduction filtering process.

[0075] Every receiving antenna except the 0th receiving antenna can obtain N FFT / D RS The second noise reduction filtering result, in which the first p The first on the root receiving antenna n The result of the second noise reduction filtering process is denoted as , represented as:

[0076] Step 13: Perform an FFT transform on the second noise reduction and filtering result to recover the relative estimation result of the second interference signal channel after time-domain noise reduction.

[0077] The number of FFT transformation points is N FFT / D RSFor the recovered time-domain denoised second interference signal channel relative estimation results, only the first part is truncated. N SC / D RS One valid result, thus every receiving antenna except the 0th receiving antenna can obtain [the desired result]. N SC / D RS The relative estimation result of the second interference signal channel, the first p Root receiving antenna k The relative estimation result of the second interference signal channel is denoted as , represented as:

[0078] Step 14: Use interpolation to obtain the final effective signal channel estimation result from the relative estimation result of the second interference signal channel.

[0079] Every receiving antenna except the 0th receiving antenna can obtain N SC The final effective signal channel estimation result, the first p Root receiving antenna k The final effective signal channel estimation results are denoted as , represented as:

[0080] Step 15: Equalization processing is performed on the final effective signal channel estimation results to recover the received signal, which can effectively suppress the impact of interference.

[0081] Each OFDM symbol containing data can be obtained N SC The received signal, the first l On the OFDM symbol containing data, the first k The received signal is denoted as Y ( S DATA ( l ), k ), represented as:

[0082] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A signal reception method suitable for single-interference suppression in OFDM systems, characterized in that, include: Calculate the relative least squares estimation results of the interference signal channel of the receiving antenna; The relative least squares estimation results are used for temporal merging and combination to obtain the noise reduction result; The noise reduction result is subjected to IFFT transformation to obtain the equivalent time-domain impulse response result of the interference signal channel; Using the equivalent time-domain impulse response results, a rectangular window is used for the first noise reduction filtering process; The first noise reduction and filtering result is subjected to FFT transformation to recover the relative estimation result of the first interference signal channel after time-domain noise reduction; The relative least squares estimation result of the effective signal channel after interference elimination is calculated using the first interference signal channel relative estimation result. Based on the relative least squares estimation results of the effective signal channel, frequency offset is estimated using the phase difference between OFDM symbols to obtain the normalized frequency offset result; Noise reduction is achieved by using the normalized frequency offset results for time-domain merging, resulting in the time-domain merged noise reduction result. An IFFT transform is performed on the time-domain merging and denoising results to obtain the time-domain impulse response of the effective signal channel relative estimation results; Noise power is calculated using the time-domain impulse response based on the relative estimation results of the effective signal channel; Using the time-domain impulse response and noise power of the effective signal channel relative estimation results, we search for the multipath delay extension range and the delay corresponding to the strongest transmission path; Based on the multipath delay extension range and the delay corresponding to the strongest transmission path, a rectangular window is used for the second noise reduction filtering process. The second noise reduction filtering result is subjected to FFT transformation to recover the relative estimation result of the second interference signal channel after time-domain noise reduction; Interpolation is used to obtain the final effective signal channel estimation result from the relative estimation result of the second interference signal channel. The received signal is recovered by equalization processing of the final effective signal channel estimation results.

2. The signal reception method for OFDM systems under single interference suppression according to claim 1, characterized in that, The relative least squares estimation results of the interference signal channel of other receiving antennas are calculated based on the 0th receiving antenna; No. p The first receiving antenna l On the OFDM symbol containing DMRS, based on the first k The first group of idle resource particles measured k The relative least squares estimation results are denoted as , represented as: in: R p ( l , k ) indicates the first p The first receiving antenna l On the OFDM symbol, the first k Frequency domain received signal on each subcarrier; S RS ( l ) represents the first time slot in a single time slot l The serial number of an OFDM symbol carrying a reference signal; D RS The interval representing the frequency domain distribution of the reference signal in an OFDM system; P min_NOISE This indicates the preset minimum noise floor power; N RX Indicates the number of receive antennas in an OFDM system; N RS_SYM This indicates the number of OFDM symbols carrying reference signals contained in a single time slot in an OFDM system; N SC This indicates the number of subcarriers used to carry valid signals in an OFDM system; k 0 indicates the offset of the frequency domain distribution of the reference signal in the OFDM system.

3. The signal reception method for single interference suppression in OFDM systems according to claim 2, characterized in that, The result of the first noise reduction filtering process is denoted as , represented as: in: τ L This represents the forward delay spread of the main path of the channel corresponding to the interference signal; τ R This represents the backward delay spread of the main path of the channel corresponding to the interference signal; N FFT This indicates the number of Fast Fourier Transform points in the OFDM system; N FFT / D RS The number of points for the Fast Inverse Fourier Transform; For the first p The first on the root receiving antenna n Equivalent time-domain impulse response results.

4. The signal reception method for OFDM systems under single interference suppression according to claim 3, characterized in that, No. l On the OFDM symbol containing DMRS, the first p Root receiving antenna k The relative least squares estimation results of the effective signal channels are denoted as follows: , represented as: in: X RS ( l , k ) indicates the first l On the OFDM symbol containing DMRS, the first k One reference signal; Indicates the first p Root receiving antenna k The relative estimation results of the interference signal channels.

5. The signal reception method for OFDM systems under single interference suppression according to claim 4, characterized in that, The noise power is expressed as: Represented as: in: Indicates the first p The noise power of the root receiving antenna; M NI This represents the number of points in the time-domain impulse response required to calculate the noise power; Indicates the first p The first on the root receiving antenna n The time-domain impulse response of the relative estimation results of each effective signal channel.

6. The signal reception method for single interference suppression in OFDM systems according to claim 5, characterized in that, No. p The multipath delay spread range corresponding to the root receiving antenna and the delay corresponding to the strongest transmission path are denoted as follows: and , represented as: in: τ max Indicates the maximum multipath delay; τ min Indicates the minimum multipath delay; τ 0 indicates the strongest path delay; η THR This represents the relative decision threshold for searching transmission paths.

7. The signal reception method for single interference suppression in OFDM systems according to claim 6, characterized in that, The result of the second noise reduction filtering process is expressed as follows: in, Indicates the first p The first on the root receiving antenna n The result of the second noise reduction filtering process.

8. The signal reception method for OFDM systems under single interference suppression according to claim 7, characterized in that, The relative estimation result of the second interference signal channel is expressed as follows: in, Indicates the first p Root receiving antenna k The relative estimation results of the second interference signal channel.

9. The signal reception method for OFDM systems under single interference suppression according to claim 8, characterized in that, The final effective signal channel estimation result is expressed as follows: in: Indicates the first p Root receiving antenna k One final effective signal channel estimation result; M SMOOTH This represents the window width for adaptive smooth interpolation; η SMOOTH This represents the threshold for calculating the width of the adaptive smooth interpolation window based on multipath delay spread.

10. The signal reception method for OFDM systems under single interference suppression according to claim 9, characterized in that, The received signal is represented as: in: Y ( S DATA ( l ), k ) indicates the first k One received signal; S DATA ( l ) represents the first time slot in a single time slot l The sequence number of an OFDM symbol carrying a data signal; N DATA_SYM This indicates the number of OFDM symbols carrying data signals contained in a single time slot in an OFDM system.

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