CN102545990B - Method and device for demodulating received signal - Google Patents
Method and device for demodulating received signal Download PDFInfo
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Abstract
The invention discloses a method and a device for demodulating a received signal, which are used for solving the problem of low quality of the demodulated signal in the prior art. The method comprises the following steps of: determining each alternative timing subset according to each TA (Terminal Adapter) of each antenna; aiming at each alternative timing subset and on the basis of the TA of each antenna in the alternative timing subset, determining each antenna noise power sum value and each antenna cross-correlation noise power sum value and determining a difference of the antenna noise power sum value and the antenna cross-correlation noise power sum value; determining the minimum difference in all the determined differences; selecting and determining the alternative timing subset which the minimum difference is based on; and carrying out subsequent demodulating step on the basis of the selected alternative timing subset. By the method, the alternative timing subset selected by a receiving end is the alternative timing subset with the lowest noise power, which is remained after the interference is eliminated in the subsequent demodulating step, so the quality of the demodulated signal is improved by demodulating the received signal on the basis of the selected alternative timing subset.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a method and an apparatus for demodulating a received channel.
Background
In wireless communication, frequency reuse technology is usually adopted to transmit signals, and co-frequency and adjacent-frequency interference become key problems affecting communication quality. In order to overcome co-channel and adjacent channel interference, a new diversity reception technique is put into use, namely: interference Rejection Combining (IRC) techniques.
The IRC technology uses multiple antennas to receive signals, and its basic principle is: during demodulation, signals from different antennas are combined, so that the power of a useful signal is increased, interference components are offset with each other, and the demodulation performance is improved.
Fig. 1 is a schematic diagram of a system for receiving signals by using IRC technology in the prior art. As shown in fig. 1, a transmitting end first encodes, interleaves, maps, modulates, and then moves to a target frequency point through up-conversion, and finally transmits to a receiver through a channel. The receiving end based on the IRC technology carries out inverse operation, firstly completes down-conversion, carries out Timing Advance (TA) search on signals received by each antenna after down-conversion, carries out joint synchronization, channel estimation and equalization demodulation, deinterleave and decoding on the signals received by each antenna based on the TA of each antenna, and finally restores original signals.
Since there is a multipath effect in the transmission process of a signal, for an antenna, the antenna will also receive the signal at different time points, which are the respective TAs corresponding to the antenna, as shown in fig. 2. Fig. 2 is a schematic diagram of signals received by two antennas at different time points, which is described by way of example in the prior art, in fig. 2, antenna 1 receives signals at the 5 different time points T0-T4, so that there are 5 total TAs of antenna 1, which are 5 time points T0-T4, respectively, and the strength of the received signal of antenna 1 is strongest when TA is T1. Accordingly, the antenna 2 receives signals at 5 different time points T1 to T5, so that the TA of the antenna 2 has 5 time points T1 to T5, respectively, and the signal strength received by the antenna 2 is strongest when the TA is T3.
In joint synchronization, the reference TA for antenna 1 and the reference TA for antenna 2 during demodulation can be selected according to the TAs of antenna 1 and the TAs of antenna 2, and the two selected reference TAs form a timing subset. Assuming that the selected reference TA for antenna 1 is T0 and the reference TA for antenna 2 is T1, the timing subset is { T0, T1 }. And, assuming that one of the TAs of antenna 1 can be optionally selected as the reference TA of antenna 1, and one of the TAs of antenna 2 can be optionally selected as the reference TA of antenna 2, the alternative timing subsets are 25 in total. That is, the process of joint synchronization is actually the process of selecting a subset of timings upon which to base subsequent demodulation. In the subsequent demodulation step, the receiving end can demodulate the signals of the antenna 1 and the antenna 2 based on the timing subset { T0, T1 }.
The IRC technique aims to increase the power of the useful signal and cancel the interference components to improve the demodulation performance. The premise of increasing the power of the useful signal is to synchronize the received signal of each antenna, so that the noise power corresponding to the synchronization time point of each antenna is as small as possible, i.e., the noise power is minimized. The premise of mutual cancellation of interference components is to find the synchronization time point of interference in the received signals of each antenna, i.e. interference synchronization, so as to extract the correlation of the interference to the maximum extent and finally eliminate the interference signals during combining and demodulation. The essence of the IRC technique is to comprehensively consider two factors, namely noise minimization and interference synchronization, and find a balance, so that after joint synchronization, the two factors exert the best combined effect during subsequent demodulation, thereby improving the demodulation performance.
However, in the process of demodulating the received signal based on the IRC technique in the prior art, when selecting the timing subset in the step of joint synchronization, only the factor of minimizing the noise power is considered, so that the noise power corresponding to the synchronization time point of each antenna is as small as possible, and the synchronization of interference in the received signal of each antenna is not considered. This results in a reduced quality of the demodulated signal if the interfering signal is not effectively cancelled in the subsequent demodulation step, even though the selected timing subset may result in a relatively low noise power of the received signal.
Disclosure of Invention
The embodiment of the invention provides a method and a device for demodulating a received signal, which are used for solving the problem of low quality of the demodulated signal in the prior art.
The method for demodulating the received signal provided by the embodiment of the invention comprises the following steps:
determining each alternative timing subset according to each time advance TA of each antenna;
respectively aiming at each determined alternative timing subset, determining noise power and value of each antenna and cross-correlation noise power and value of each antenna based on TA of each antenna in the alternative timing subset, and determining difference between the noise power and value of each antenna and the cross-correlation noise power and value of each antenna;
determining the smallest difference value among the determined difference values, and selecting an alternative timing subset on which the smallest difference value is determined;
subsequent demodulation steps are performed based on the selected alternative timing subset.
An embodiment of the present invention provides an apparatus for demodulating a received signal, including:
an alternative timing subset determining module, configured to determine each alternative timing subset according to each time advance TA of each antenna;
a power determining module, configured to determine, for each determined candidate timing subset, a noise power sum value of each antenna and a cross-correlation noise power sum value of each antenna based on a TA of each antenna in the candidate timing subset, and determine a difference between the noise power sum value of each antenna and a mutual optical noise power sum value of each antenna;
a selection module, configured to determine a minimum difference value among the determined difference values, and select an alternative timing subset on which the minimum difference value is determined to be based;
and the analysis processing module is used for carrying out subsequent demodulation steps based on the selected alternative timing subset.
The embodiment of the invention provides a method and a device for demodulating a received signal, wherein the method comprises the steps of determining each alternative timing subset according to each TA of each antenna, determining each antenna noise power sum value and each antenna cross-correlation noise power sum value according to each alternative timing subset and the TA of each antenna in each alternative timing subset, determining the difference between each antenna noise power sum value and each antenna cross-correlation noise power sum value, determining the minimum difference in each determined difference, selecting the alternative timing subset on which the minimum difference is determined, and performing subsequent demodulation steps according to the selected alternative timing subset. By the method, the receiving end selects the alternative timing subset for subsequent demodulation as the alternative timing subset which minimizes the residual noise power after eliminating interference in the subsequent demodulation step, so that the received signal is demodulated based on the selected alternative timing subset, and the quality of the demodulated signal is improved.
Drawings
Fig. 1 is a schematic diagram of a system for receiving signals by using IRC technology in the prior art;
fig. 2 is a schematic diagram of signals received by two antennas at different time points, which is described in the prior art by taking two antennas as an example;
fig. 3 is a process for demodulating a received signal according to an embodiment of the present invention;
fig. 4 is a detailed process of demodulating a received signal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus for demodulating a received signal according to an embodiment of the present invention.
Detailed Description
Because the IRC technique eliminates interference components by finding the synchronization time point of interference in the received signals of each antenna, and eliminating interference according to the correlation of interference, theoretically, the interference that can be eliminated by the IRC technique is the power and value of the cross-correlation noise of each antenna, and the interference that can be eliminated actually is a part of the power and value of the cross-correlation noise of each antenna, for example, 90% or 95% of the power and value of the cross-correlation noise of each antenna. However, the total interference of the signals received by the receiving end is the noise power and the value of each antenna, and the timing subset selected for demodulation in the prior art is the timing subset that minimizes the noise power and the value of each antenna, but the interference that can be eliminated is not considered, so that the quality of the demodulated signals is low. In order to improve the quality of the demodulation signal, the embodiment of the invention comprehensively considers all interferences and the interferences which can be eliminated, selects the timing subset which can ensure that the residual interferences are minimum after the interferences which can be eliminated are eliminated in all the interferences, and uses the timing subset for subsequent demodulation, thereby improving the quality of the demodulation signal.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Fig. 3 is a process of demodulating a received signal according to an embodiment of the present invention, which specifically includes the following steps:
s301: and determining each alternative timing subset according to each time advance TA of each antenna.
In the embodiment of the invention, the receiving end firstly searches each TA of the antenna aiming at each antenna of the receiving end, and determines each alternative timing subset according to each searched TA of each antenna. And, for each alternative timing subset, each element in the alternative timing subset is a certain TA corresponding to each antenna.
S302: and respectively aiming at each determined alternative timing subset, determining each antenna noise power sum value and each antenna cross-correlation noise power sum value based on the TA of each antenna in the alternative timing subset, and determining the difference value of each antenna noise power sum value and each antenna cross-correlation noise power sum value.
In the embodiment of the present invention, for each candidate timing subset, the receiving end determines the noise power and the value of each antenna based on the TA of each antenna in the candidate timing subset, that is, determines the sum of the noise powers of each antenna when the TA corresponding to the candidate timing subset is used as the reference TA, that is, determines all interferences of the signals received by the receiving end when each antenna is based on the candidate timing subset.
Based on the alternative timing subset, the cross-correlation noise power and the value of each antenna are determined, that is, the sum of the cross-correlation noise powers of each antenna when the corresponding TA in the alternative timing subset is used as a reference TA is determined, that is, the interference which can be eliminated in all the interferences when the receiving end demodulates based on the alternative timing subset is determined.
Based on the alternative timing subset, determining a difference value between the noise power sum value of each antenna and the cross-correlation noise power sum value of each antenna, that is, determining the residual interference part after the interference which can be eliminated is eliminated in all the interferences when the receiving end demodulates based on the alternative timing subset, and defining the difference value as: the power values are lossy. That is, after the interference that can be cancelled is cancelled, the smaller the remaining lossy power value is, the higher the quality of the demodulated signal at the time of the subsequent demodulation of the received signal is.
S303: of each difference determined, the smallest difference is determined, and the alternative timing subset on which the smallest difference is determined is selected.
Since the remaining lossy power value is smaller after the interference that can be cancelled is cancelled, the quality of the subsequent demodulated signal is higher, in the embodiment of the present invention, the receiving end determines the smallest lossy power value from the lossy power values determined for each candidate timing subset, and selects the candidate timing subset on which the smallest lossy power value is determined.
S304: subsequent demodulation steps are performed based on the selected alternative timing subset.
Since the selected alternative timing subset may minimize the remaining lossy power value after the interference that can be cancelled is cancelled, subsequent demodulation of the received signal based on the selected alternative timing subset may maximize the quality of the demodulated signal.
In the above process, after the receiving end determines each candidate timing subset, for each candidate timing subset, based on the TA of each antenna in the candidate timing subset, the noise power and value of each antenna and the cross-correlation noise power and value of each antenna are determined, that is, all interference and interference that can be eliminated when the receiving end receives signals based on the candidate timing subset are determined, then the difference between the noise power and value of each antenna and the cross-correlation noise power and value of each antenna is determined, that is, after the interference that can be eliminated is eliminated when demodulation is performed based on the candidate timing subset, the remaining lossy power value is determined, and then the candidate timing subset based on which the smallest lossy power value is determined is selected, and the subsequent demodulation step is performed based on the selected candidate timing subset. By the method, the alternative timing subset selected by the receiving end for subsequent demodulation is the alternative timing subset with the smallest residual lossy power value after the interference which can be eliminated is eliminated, so that the received signal is demodulated based on the selected alternative timing subset, and the quality of the demodulated signal is improved.
In the embodiment of the present invention, it is considered that if the number of the provided alternative timing subsets is too small, it may be insufficient for the receiving end to select the alternative timing subset with the smallest lossy power value, and if the number of the provided alternative timing subsets is too large, the receiving end may also determine the antenna noise power and value and the antenna cross-correlation noise power and value based on each alternative timing subset, so that the demodulation efficiency is reduced. Therefore, in order to provide a suitable number of candidate timing subsets, on one hand, it is sufficient for the receiving end to select the candidate timing subset from which the lossy power value is minimized, and on the other hand, the receiving end does not need to calculate excessive noise power and value of each antenna and cross-correlation noise power and value of each antenna, so as to improve demodulation efficiency, in step S301 shown in fig. 1, the process of determining each candidate timing subset by the receiving end according to each TA of each antenna is specifically: for each antenna, according to each TA of the antenna, determining the TA where the strength of the received signal of the antenna is strongest as a strongest path TA, and in each TA of the antenna, determining a set formed by each TA not greater than the strongest path TA as a candidate sampling set corresponding to the antenna; according to the determined alternative sampling sets corresponding to each antenna, a set is established by adopting a setting method, and each set which can be established by adopting the setting method is determined as each alternative timing subset, wherein the establishment of the set by adopting the setting method specifically comprises the steps of selecting one TA in each alternative sampling set corresponding to each antenna and establishing one set by taking each TA as an element.
The above procedure for determining each alternative timing subset is described below by taking TA for each antenna as an example as shown in fig. 2.
In fig. 2, TA of the antenna 1 is 5 time points T0 to T4, where the strength of the signal received by the antenna 1 is strongest when TA is T1, and therefore, for the antenna 1, the TA at which the strength of the signal received by the antenna 1 is strongest is determined to be T1, that is, T1 is the strongest path TA of the antenna 1, and therefore, among TAs of the antenna 1, TAs that are not greater than the strongest path TA of the antenna 1 (that is, T1) are: and T0 and T1, and determining a set { T0, T1} formed by T0 and T1 as an alternative sampling set corresponding to the antenna 1. Correspondingly, the TA of the antenna 2 is 5 time points T1 to T5, where the strength of the signal received by the antenna 2 is strongest when TA is T3, and therefore, for the antenna 2, the TA at which the strength of the signal received by the antenna 2 is strongest is determined to be T3, that is, T3 is the strongest path TA of the antenna 2, and therefore, among the TAs of the antenna 2, TAs that are not greater than the strongest path TA of the antenna 2 (that is, T3) are: t1, T2, and T3 determine a set { T1, T2, and T3} of T1, T2, and T3 as a candidate sample set corresponding to antenna 2.
After determining that the candidate sample set of the antenna 1 is { T0, T1}, and the candidate sample set of the antenna 2 is { T1, T2, T3}, the process of establishing a set by using a setting method specifically includes: selecting one optional TA in the alternative sampling set { T0, T1} of antenna 1, assuming to be T0, selecting one optional TA in the alternative sampling set { T1, T2, T3} of antenna 2, assuming to be T1, then taking the optional TAs as elements, that is, taking the optional T0 in the alternative sampling set of antenna 1 and the optional T1 in the alternative sampling set of antenna 2 as elements, and establishing a set, that is, { T0, T1}, where the set { T0, T1} is an alternative timing subset, and in the alternative timing subset, T0 is a reference TA for antenna 1 and T1 is a reference TA for antenna 2. The set is continuously established by adopting the setting method, each set which can be established by adopting the method is determined as each alternative timing subset, namely, all permutation combinations of any TA in the alternative sampling sets of the antenna 1 and the antenna 2 are traversed, and the set formed by each permutation combination is determined as each alternative timing subset. Specifically, since the candidate sample set of the antenna 1 is { T0, T1}, and the candidate sample set of the antenna 2 is { T1, T2, T3}, there are 6 permutation combinations of any TA in the candidate sample set of the antenna 1 and the candidate sample set of the antenna 2, respectively, and each permutation combination forms a set, and then the 6 sets are determined as 6 candidate timing subsets, which are: { T0, T1}, { T0, T2}, { T0, T3}, { T1, T1}, { T1, T2}, and { T1, T3 }.
In practical application, a training sequence agreed in advance with a receiving end is carried in a signal sent by a sending end, and a position where the training sequence is carried in the signal is also agreed in advance with the receiving end, so that in the process of determining each alternative timing subset, for each antenna, according to each TA of the antenna, a method for determining the TA where the antenna receives the strongest signal strength specifically includes: for each TA of the antenna, determining a training sequence carried in a received signal of the antenna by taking the TA as a reference TA, and performing cross-correlation operation on the training sequence stored locally and the training sequence carried in the determined received signal to obtain a cross-correlation operation result; and according to the cross-correlation operation result obtained respectively aiming at each TA of the antenna, determining the TA based on the maximum cross-correlation operation result as the TA where the strength of the received signal of the antenna is strongest.
Continuing to explain along the above example, if each TA of the antenna 1 is T0-T4, the actual position of the training sequence carried in the received signal of the antenna 1 is determined according to the position carrying the training sequence in the signal predetermined by the transmitting end for T0, and T0 is the reference TA of the antenna 1, and the training sequence carried in the received signal is extracted at the determined position, and the training sequence stored locally and the extracted training sequence are subjected to cross-correlation operation, specifically, sliding window correlation operation, to obtain the cross-correlation operation result of the antenna 1 based on T0. Correspondingly, the cross-correlation operation results of the antenna 1 based on T1, T2, T3 and T4 are respectively determined in the same way, the maximum cross-correlation operation result in the obtained 5 cross-correlation operation results is determined, and the TA based on the maximum cross-correlation operation result is determined as the TA where the strength of the received signal of the antenna 1 is strongest. By the same method, the TA where the strength of the signal received by the antenna 2 is strongest can be determined, and details thereof are not repeated.
In addition, the method for determining the TA at which the strength of the signal received by the antenna is strongest may further be that, taking the TA at the minimum of the antenna as a reference TA, performing channel estimation on the antenna to obtain a channel estimation result corresponding to each TA of the antenna, and determining the TA corresponding to the maximum obtained channel estimation result as the TA at which the strength of the signal received by the antenna is strongest.
After determining each candidate timing subset by the above method, step S302 shown in fig. 3 may be performed, that is, for each candidate timing subset, based on the TA of each antenna in the candidate timing subset, the noise power and value of each antenna and the cross-correlation noise power and value of each antenna are determined.
In step S302 shown in fig. 3, the method for determining the noise power and the noise value of each antenna specifically includes: for each antenna, taking the TA corresponding to the antenna in the alternative timing subset as a reference TA, determining a training sequence carried in a received signal of the antenna, and determining a channel impulse response of the antenna based on the reference TA; performing convolution operation on a training sequence stored locally and the determined channel impulse response to obtain a reconstruction sequence of the antenna, and determining a difference value between the training sequence carried in the received signal of the antenna and the reconstruction sequence of the antenna as a noise vector of the antenna; and determining the noise power sum value of each antenna by adopting the following formula according to the noise vector determined respectively for each antenna:
wherein, Pnoise_sumFor each antenna noise power sum, r is the number of antennas, len is the length of the training sequence, reconstruction sequence and noise vector, Ni(k) Is the value of the k point in the noise vector for the i antenna.
Continuing with the above example, assuming that the noise power and the value of each antenna are determined based on the alternative timing subset { T0, T1}, first, for the antenna 1, since T0 is the TA corresponding to the antenna 1 in the alternative timing subset { T0, T1}, then T0 is the reference TA of the antenna 1, the training sequence carried in the received signal of the antenna 1 is determined, and is denoted as Q1 receiving(k) Where k denotes a value of a k-th point of a training sequence carried in the received signal, anAnd k is an integer not less than 1 and not more than len, len being the length of the training sequence carried in the received signal. Based on this reference TA (i.e., T0), the channel impulse response of antenna 1 is determined, denoted as S1(t) of (d). Training sequence Q stored locallyLocal area(k) Channel impulse response S with antenna 11(t) convolution to obtain the reconstruction sequence of the antenna 1, denoted as Q1 reconstruction(k) Training sequence Q carried in received signal1 receiving(k) And the reconstructed sequence Q1 reconstruction(k) Subtracting to obtain the noise vector N of the antenna 11(k) I.e. N1(k)＝Q1 receiving(k)-Q1 reconstruction(k) In that respect Naturally, the length of the training sequence stored locally, the length of the training sequence carried in the received signal, and the length of the noise vector are the same, and all are len. If with the noise vector N of antenna 11(k) Form a column matrix for the columns, denoted N1Then the column matrix N1Namely:
correspondingly, in the alternative timing subset { T0, T1}, T1 is TA corresponding to antenna 2, and T1 is taken as reference TA of antenna 2, and the same method is adopted to determine noise vector N of antenna 22(k) In that respect According to the noise vectors N of antenna 1 and antenna 21(k) And N2(k) By the formulaDetermining the sum of the noise power of the antenna 1 and the antenna 2, i.e. determining the sum of the noise power of the antenna 1 and the antenna 2 <math>
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In step S302 shown in fig. 3, based on the TA of each antenna in the alternative timing subset, the method for determining the cross-correlation noise power and value of each antenna specifically includes: and determining the cross-correlation noise power sum value of each antenna by adopting the following formula according to the noise vector determined respectively for each antenna:
wherein, Pcor_sumFor each antenna cross-correlation noise power sum value,is a conjugate transpose matrix of a column matrix formed by taking the noise vector of the ith antenna as a column, Ni+mIs a column matrix formed by taking the noise vector of the i + m th antenna as a column.
Continuing with the above example, the noise vectors N for antenna 1 and antenna 2 are determined1(k) And N2(k) Then, with the noise vector N of the antenna 11(k) Forming a column matrix N for the columns1With the noise vector N of the antenna 22(k) Forming a column matrix N for the columns2I.e. by Using a formula <math>
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</math> Determining the sum of the cross-correlation noise power of antenna 1 and antenna 2, i.e.Wherein,is a column matrix N1The conjugate transpose of (c). In the subsequent steps, the respective antenna noise power sum value P can then be determinednoise_sumPower sum of noise correlated with each antennacor_sumIs taken as a value of the lossy power, the value of the lossy power is denoted as Pdestroy_tempThen P isdestroy_temp＝Pnoise_sum-Pcor_sum. This is when based on the alternative timing subset { T0, T1}, determining the lossy powerBased on the same method, when the method is based on other 5 alternative timing subsets, the method for rate value can determine corresponding lossy power values, and select the alternative timing subset based on which the determined lossy power value is the smallest for subsequent demodulation.
In an embodiment of the present invention, in order to further improve the quality of the demodulated signal, when determining the difference between the antenna-specific noise power sum value and the antenna-specific cross-correlation noise power sum value, i.e. when determining the lossy power value, a first weight value and a second weight value may be preset, the first weight value may be denoted as α, the second weight value may be denoted as β, the product of the determined antenna noise power sum value and the set first weight value may be re-determined as the antenna noise power sum value, the product of the determined antenna cross-correlation noise power sum value and the set second weight value may be re-determined as the antenna cross-correlation noise power sum value, and determining the difference value obtained by subtracting the newly determined cross-correlation noise power sum value of each antenna from the newly determined noise power sum value of each antenna as the difference value between the noise power sum value of each antenna and the cross-correlation noise power sum value of each antenna. That is, the newly determined antenna noise power sum value is denoted as P'noise_sumThen P'noise_sum＝α×Pnoise_sumAnd recording the redetermined cross-correlation noise power sum value of each antenna as P'cor_sumThen P'cor_sum＝β×Pcor_sumThe difference between the sum of the noise power of each antenna and the sum of the noise power of the cross-correlation of each antenna, i.e. the value of the lossy power Pdestroy_temp＝P′noise_sum-P′cor_sum＝α×Pnoise_sum-β×Pcor_sum. The first weighting value and the second weighting value can be set according to needs.
Fig. 4 is a detailed process of demodulating a received signal according to an embodiment of the present invention, which specifically includes the following steps:
s401: and determining each alternative timing subset according to each time advance TA of each antenna, sequencing the determined alternative timing subsets in any order, and setting the lossy power value as a set initial value.
Wherein the initial value of the setting should be sufficiently large.
S402: selecting a next alternative timing subset according to each alternative timing subset of the ordering.
S403: and determining the noise power sum value of each antenna and the cross-correlation noise power sum value of each antenna based on the TA of each antenna in the selected alternative timing subset, and determining the difference value of the noise power sum value of each antenna and the cross-correlation noise power sum value of each antenna.
S404: and judging whether the determined difference value is smaller than the lossy power value, if so, executing the step S405, otherwise, executing the step S406.
S405: the determined difference value is given to the lossy power value, and step S406 is performed.
S406: and judging whether the selected alternative timing subset is the last alternative timing subset, if so, performing step S407, and otherwise, returning to the step S402.
Steps S402 to S406 are to select an alternative timing subset based on which the lossy power value is to be minimized.
S407: a subsequent demodulation step is performed on the received signal based on the selected alternative subset of timings.
Fig. 5 is a schematic structural diagram of an apparatus for demodulating a received signal according to an embodiment of the present invention, which specifically includes:
an alternative timing subset determining module 501, configured to determine each alternative timing subset according to each time advance TA of each antenna;
a power determining module 502, configured to determine, for each determined candidate timing subset, a noise power sum value of each antenna and a cross-correlation noise power sum value of each antenna based on a TA of each antenna in the candidate timing subset, and determine a difference between the noise power sum value of each antenna and a mutual optical noise power sum value of each antenna;
a selecting module 503, configured to determine a minimum difference value among the determined difference values, and select an alternative timing subset on which the minimum difference value is determined;
a parsing processing module 504 for performing a subsequent demodulation step based on the selected alternative timing subset.
The candidate timing subset determining module 501 is specifically configured to determine, for each antenna, according to each TA of the antenna, a TA where the strength of the received signal of the antenna is strongest, as a strongest path TA, and determine, in each TA of the antenna, a set formed by each TA not greater than the strongest path TA as a candidate sampling set corresponding to the antenna; according to the determined alternative sampling set corresponding to each antenna, a set is established by adopting a setting method, and each set which can be established by adopting the setting method is determined as each alternative timing subset, wherein the establishment of the set by adopting the setting method specifically comprises the following steps: and respectively selecting one TA in the alternative sampling sets corresponding to each antenna, and establishing a set by taking the selected TA as an element.
The alternative timing subset determining module 501 is specifically configured to, for each TA of the antenna, determine a training sequence carried in a received signal of the antenna by using the TA as a reference TA, and perform cross-correlation operation on a training sequence stored locally and the training sequence carried in the determined received signal to obtain a cross-correlation operation result; and according to the cross-correlation operation result obtained respectively aiming at each TA of the antenna, determining the TA based on the maximum cross-correlation operation result as the TA where the strength of the received signal of the antenna is strongest.
The power determining module 502 is specifically configured to, for each antenna, determine a training sequence carried in a received signal of the antenna by using the TA corresponding to the antenna in the candidate timing subset as a reference TA, determine a channel impulse response of the antenna based on the reference TA, perform convolution operation on the locally stored training sequence and the determined channel impulse response of the antenna to obtain a reconstruction sequence of the antenna, and subtract the determined training sequence carried in the received signal of the antenna from the antenna by using the TA carried in the candidate timing subset as a reference TADetermining the difference value of the reconstructed sequence of the antenna as a noise vector of the antenna; according to the noise vector determined for each antenna separately, the formula is adopted:determining a sum of the antenna noise powers, where Pnoise_sumFor each antenna noise power sum, r is the number of antennas, len is the length of the training sequence, reconstruction sequence and noise vector, Ni(k) Is the value of the k point in the noise vector for the i antenna.
The power determining module 502 is specifically configured to, according to the noise vector determined for each antenna, adopt a formula:determining a sum of the cross-correlation noise power of each antenna, wherein Pcor_sumFor each antenna cross-correlation noise power sum value,is a conjugate transpose matrix of a column matrix formed by taking the noise vector of the ith antenna as a column, Ni+mIs a column matrix formed by taking the noise vector of the i + m th antenna as a column.
The power determining module 502 is specifically configured to re-determine the product of the determined antenna noise power sum value and the set first weighted value as the antenna noise power sum value, re-determine the product of the determined antenna cross-correlation noise power sum value and the set second weighted value as the antenna cross-correlation noise power sum value, and determine the difference obtained by subtracting the re-determined antenna noise power sum value from the re-determined antenna noise power sum value as the difference between the antenna noise power sum value and the antenna cross-correlation noise power sum value.
The device for demodulating the received signal may be specifically located in the receiving end.
The embodiment of the invention provides a method and a device for demodulating a received signal, wherein the method comprises the steps of determining each alternative timing subset according to each TA of each antenna, determining each antenna noise power sum value and each antenna cross-correlation noise power sum value according to each alternative timing subset and the TA of each antenna in each alternative timing subset, determining the difference between each antenna noise power sum value and each antenna cross-correlation noise power sum value, determining the minimum difference in each determined difference, selecting the alternative timing subset on which the minimum difference is determined, and performing subsequent demodulation steps according to the selected alternative timing subset. By the method, the receiving end selects the alternative timing subset for subsequent demodulation as the alternative timing subset which minimizes the residual noise power after eliminating interference in the subsequent demodulation step, so that the received signal is demodulated based on the selected alternative timing subset, and the quality of the demodulated signal is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (12)
1. A method of demodulating a received signal, comprising:
determining each alternative timing subset according to each time advance TA of each antenna; for each alternative timing subset, each element in the alternative timing subset is a certain TA corresponding to each antenna;
respectively aiming at each determined alternative timing subset, determining noise power and value of each antenna and cross-correlation noise power and value of each antenna based on TA of each antenna in the alternative timing subset, and determining difference between the noise power and value of each antenna and the cross-correlation noise power and value of each antenna;
determining the smallest difference value among the determined difference values, and selecting an alternative timing subset on which the smallest difference value is determined;
subsequent demodulation steps are performed based on the selected alternative timing subset.
2. The method of claim 1, wherein determining each alternative timing subset according to the timing advance TA of each antenna specifically comprises:
for each antenna, according to each TA of the antenna, determining the TA where the strength of the received signal of the antenna is strongest as a strongest path TA, and in each TA of the antenna, determining a set formed by each TA not greater than the strongest path TA as a candidate sampling set corresponding to the antenna;
according to the determined alternative sampling set corresponding to each antenna, a set is established by adopting a setting method, and each set which can be established by adopting the setting method is determined as each alternative timing subset, wherein the establishment of the set by adopting the setting method specifically comprises the following steps: and respectively selecting one TA in the alternative sampling sets corresponding to each antenna, and establishing a set by taking the selected TA as an element.
3. The method of claim 2, wherein determining the TA at which the strength of the received signal from the antenna is strongest according to the TAs of the antenna comprises:
for each TA of the antenna, determining a training sequence carried in a received signal of the antenna by taking the TA as a reference TA, and performing cross-correlation operation on the training sequence stored locally and the training sequence carried in the determined received signal to obtain a cross-correlation operation result;
and according to the cross-correlation operation result obtained respectively aiming at each TA of the antenna, determining the TA based on the maximum cross-correlation operation result as the TA where the strength of the received signal of the antenna is strongest.
4. The method of claim 1, wherein determining the noise power and the value of each antenna based on the TA for each antenna in the alternative timing subset comprises:
for each antenna, taking the TA corresponding to the antenna in the alternative timing subset as a reference TA, determining a training sequence carried in a received signal of the antenna, and determining a channel impulse response of the antenna based on the reference TA;
performing convolution operation on a training sequence stored locally and the determined channel impact response of the antenna to obtain a reconstruction sequence of the antenna, and determining a difference value between the training sequence carried in the received signal of the antenna and the reconstruction sequence of the antenna as a noise vector of the antenna;
and determining the noise power sum value of each antenna by adopting the following formula according to the noise vector determined respectively for each antenna:
wherein, Pnoise_sumFor each antenna noise power sum, r is the number of antennas, len is the length of the training sequence, reconstruction sequence and noise vector, Ni(k) Is the value of the k point in the noise vector for the i antenna.
5. The method of claim 4, wherein determining the cross-correlation noise power and value for each antenna based on the TA for each antenna in the alternative timing subset comprises:
and determining the cross-correlation noise power sum value of each antenna by adopting the following formula according to the noise vector determined respectively for each antenna:
wherein, Pcor_sumFor each antenna cross-correlation noise power sum value,is a conjugate transpose matrix of a column matrix formed by taking the noise vector of the ith antenna as a column, Ni+mIs a column matrix formed by taking the noise vector of the i + m th antenna as a column.
6. The method of claim 1, wherein determining a difference between the noise power sum value for each antenna and the cross-correlation noise power sum value for each antenna comprises:
the product of the determined noise power sum value of each antenna and the set first weighted value is determined as the noise power sum value of each antenna again;
the product of the determined cross-correlation noise power sum value of each antenna and the set second weighted value is re-determined as the cross-correlation noise power sum value of each antenna;
and determining the difference value obtained by subtracting the newly determined cross-correlation noise power sum value of each antenna from the newly determined noise power sum value of each antenna as the difference value between the noise power sum value of each antenna and the cross-correlation noise power sum value of each antenna.
7. An apparatus for demodulating a received signal, comprising:
an alternative timing subset determining module, configured to determine each alternative timing subset according to each time advance TA of each antenna; for each alternative timing subset, each element in the alternative timing subset is a certain TA corresponding to each antenna;
a power determining module, configured to determine, for each determined candidate timing subset, a noise power sum value of each antenna and a cross-correlation noise power sum value of each antenna based on a TA of each antenna in the candidate timing subset, and determine a difference between the noise power sum value of each antenna and a mutual optical noise power sum value of each antenna;
a selection module, configured to determine a minimum difference value among the determined difference values, and select an alternative timing subset on which the minimum difference value is determined to be based;
and the analysis processing module is used for carrying out subsequent demodulation steps based on the selected alternative timing subset.
8. The apparatus according to claim 7, wherein the alternative timing subset determining module is specifically configured to, for each antenna, determine, according to each TA of the antenna, a TA at which the strength of the received signal of the antenna is strongest as a strongest path TA, and in each TA of the antenna, determine a set of TAs that is not greater than the strongest path TA as the alternative sample set corresponding to the antenna; according to the determined alternative sampling set corresponding to each antenna, a set is established by adopting a setting method, and each set which can be established by adopting the setting method is determined as each alternative timing subset, wherein the establishment of the set by adopting the setting method specifically comprises the following steps: and respectively selecting one TA in the alternative sampling sets corresponding to each antenna, and establishing a set by taking the selected TA as an element.
9. The apparatus according to claim 8, wherein the alternative timing subset determining module is specifically configured to, for each TA of the antenna, determine a training sequence carried in a received signal of the antenna by using the TA as a reference TA, and perform cross-correlation operation on a training sequence stored locally and the training sequence carried in the determined received signal to obtain a cross-correlation operation result; and according to the cross-correlation operation result obtained respectively aiming at each TA of the antenna, determining the TA based on the maximum cross-correlation operation result as the TA where the strength of the received signal of the antenna is strongest.
10. The apparatus according to claim 7, wherein the power determining module is specifically configured to, for each antenna, determine a training sequence carried in a received signal of the antenna with a TA corresponding to the antenna in the alternative timing subset as a reference TA, determine a channel impulse response of the antenna based on the reference TA, perform convolution operation on the locally stored training sequence and the determined channel impulse response of the antenna to obtain a reconstructed sequence of the antenna, and determine a difference between the determined training sequence carried in the received signal of the antenna and the reconstructed sequence of the antenna as a noise vector of the antenna; according to the noise vector determined for each antenna separately, the formula is adopted:determining a sum of the antenna noise powers, where Pnoise_sumFor each antenna noise power sum, r is the number of antennas, len isLength of training sequence, reconstruction sequence and noise vector, Ni(k) Is the value of the k point in the noise vector for the i antenna.
11. The apparatus of claim 10, wherein the power determination module is specifically configured to employ a formula based on the noise vectors determined for each antenna individually:determining a sum of the cross-correlation noise power of each antenna, wherein Pcor_sumFor each antenna cross-correlation noise power sum value,is a conjugate transpose matrix of a column matrix formed by taking the noise vector of the ith antenna as a column, Ni+mIs a column matrix formed by taking the noise vector of the i + m th antenna as a column.
12. The apparatus of claim 7, wherein the power determination module is configured to re-determine the determined product of the sum of the antenna noise powers and the set first weighting value as the sum of the antenna noise powers, re-determine the determined product of the sum of the antenna cross-correlation noise powers and the set second weighting value as the sum of the antenna cross-correlation noise powers, re-determine the re-determined sum of the antenna noise powers and the set second weighting value as the sum of the antenna cross-correlation noise powers, subtract the newly determined difference of the sum of the antenna cross-correlation noise powers and the set second weighting value, and determine the re-determined difference of the sum of the antenna noise powers and the set second weighting value as the difference of the sum of the antenna noise powers and the set second weighting value.
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