KR20020081011A - Method and apparatus for processing received signals without weight vector computing in antenna array system - Google Patents

Abstract

PURPOSE: A method and an apparatus for processing a receiving signal in an antenna array system without calculating a weight vector are provided to improve the performance of signal detection and reduce the error rate of signal by allowing a desired signal to obtain a gain proportional to the number of antenna devices and making an interference signal to an independent noise corresponding to the respective antenna devices. CONSTITUTION: Signals inputted through an antenna array having a plurality of antenna devices are experienced with the envelope detection with respect to the respective antenna devices. The envelope detection results are added to each other. The added result is outputted as an envelope detecting signal, in order to perform a non-coherent receiving operation. The respective antenna devices are disposed within λ. A desired signal obtains a gain proportional to the number of the antenna devices while an interference signal acquires a gain lower than the gain of the desired signal.

Description

Method and apparatus for processing received signals without weight vector computing in antenna array system

The present invention relates to a signal receiving processing technique in an antenna array system, and more particularly, to a method and apparatus for processing a received signal without weight vector calculation in an antenna array system, and to a computer readable recording medium recording a program for realizing the same. It is about.

Conventional base station reception system generally employs a demodulation technique using a single antenna, which has technical limitations in improving communication capacity and quality, and also has many difficulties in reducing noise and interference effects.

On the other hand, in order to improve the call quality and increase the capacity of the wireless communication system, a method of providing an antenna array system for selectively receiving a signal in a wireless signal space at the base station has been proposed to improve the communication quality by reducing the interference signal Although attempts were made to improve, the amount of computation for the signal processing was enormous, and there was still a limit to reducing noise and interference effects.

In particular, the present applicant is a method for processing the array antenna received signal using the improved weight vector (vector) algorithm in a wireless communication system, US Patent No. 5,808,913, US Patent No. 5,999,800, US Patent No. 6,127,973 and U.S. Patent No. 6,188,352, etc. proposed to significantly reduce the amount of computation, but this also not only increases the system load in order to perform the signal processing in real time in a wireless signal environment involving a fundamentally complex computation, The system configuration is complicated.

The present invention has been proposed to solve the problems of the prior art as described above, while the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal is an independent noise for each antenna element. Accordingly, an object of the present invention is to provide a method of processing a received signal without calculating a weight vector in an antenna array system, which has a relatively much smaller gain than the original signal.

In addition, the present invention, while the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal is to be independent noise for each antenna element to have a relatively much smaller gain than the original signal Another object is to provide an apparatus for processing a received signal without calculating a weight vector in an antenna array system.

In addition, the present invention, while the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal is to be independent noise for each antenna element to have a relatively much smaller gain than the original signal Another object is to provide a computer-readable recording medium containing a program for realizing a method of processing a received signal without calculating a weight vector in an antenna array system.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic signal processing block diagram illustrating the concept of phase diversity in a base station receiving system having N antenna arrays to which the present invention is applied.

2 isS _{l, k} = 50,σDepends on the number of antennas obtained by plotting for ² = 1000 and N values of 1, 2, 3, 4Z _{i, k} Performance distribution distribution chart.

FIG. 3 shows the performance of Z _{l, k} according to the number of antennas obtained by plotting when S _{l, k} = 0 (when there is no desired signal), σ ² = 1000 and N value is 1, 2, 3, 4 Improved distribution graph.

4 is a diagram illustrating an embodiment of a receiving apparatus to which phase diversity is applied to an IS-95 reverse detector according to the present invention.

Fig. 5 is a graph obtained by theoretical values when the processing gain (PC), which is the number of chips to be integrated, is 64, and the number of users is 50.

Fig. 6 is a graph obtained by simulation when PG (processing gain), which is the number of chips to be integrated, is 64, and the number of users is 50;

Fig. 7 is a graph of P _F versus P _D obtained by theoretical values when the number of antenna elements is one;

8 is a graph of P _F versus P _D obtained by simulation when the number of antenna elements is one;

9 is a diagram illustrating an embodiment of a receiving apparatus to which phase diversity is applied to an IS-95 reverse demodulator according to the present invention.

10 is the integration periodT _W In the IS-95 reverse link with = 256, the theoretical word error rate was obtained by increasing the number of antenna elements N to 1, 2, 3, 4.P _W (/)) Graph diagram.

11 is a graph of the word error rate ( P _W (/)) obtained by simulation while increasing the number of antenna elements N to 1, 2, 3, 4 in an IS-95 reverse link with an integral period T _W = 256. FIG.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for processing a received signal in a wireless receiving system that performs non-coherent reception, comprising: a plurality of incident signals through an antenna array having a plurality of antenna elements; A first step of processing the received signal to perform envelope detection for each antenna element with respect to the signals of the antenna; A second step of adding the envelope detection results obtained in the reception signal processing performed for each antenna element in the first step; And a third step of outputting the result added in the second step as an envelope detection signal for performing non-coherent reception, wherein the received signal is processed without additional weight vector calculation. .

In addition, the method for processing a received signal, characterized in that each of the antenna elements are arranged to have a spacing within λ .

Further, in the method for processing a received signal, in the first step, the phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel and only the magnitude is absolute. While the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, the interference signal is characterized by having a much smaller gain than the original signal by making the noise independent of each antenna element.

Meanwhile, in order to achieve the above object, the present invention provides a device for processing a received signal in a wireless receiving system that performs incoherent reception, comprising: a plurality of signals incident through an antenna array having a plurality of antenna elements Means for processing the received signal to perform envelope detection for each antenna element with respect to the antenna; Means for adding the envelope detection results obtained in the reception signal processing performed for each antenna element in the means for processing the received signal; And means for outputting the result added by the adding means as an envelope detection signal for performing non-coherent reception, wherein the received signal is processed without additional weight vector calculation.

In addition, the apparatus for processing the received signal, characterized in that each of the antenna elements are arranged to have a spacing within λ .

In addition, in the apparatus for processing a received signal, the means for processing the received signal, the phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and Q-channel and the absolute value ( Only the magnitude remains, and the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. It is done.

On the other hand, the present invention, in order to achieve the above object, in order to process the received signal in a wireless receiving system for performing non-coherent reception, a signal processing device having a microprocessor, a plurality of antenna elements ( λ within the interval λ) A first function of processing a received signal such that envelope detection is performed for each antenna element with respect to a plurality of signals incident through the antenna array having the antenna array; A second function of adding an envelope detection result obtained in the reception signal processing performed for each antenna element in the first function; And a program for realizing a third function of outputting the result added by the second function as an envelope detection signal for performing non-coherent reception.

Meanwhile, in order to achieve the above object, the present invention is applied to a system of a code division multiple access method for performing incoherent reception, and in the signal processing method for detecting a received signal, the antenna having a plurality of antenna elements To process the received signal to perform envelope detection for each antenna element for a plurality of signals incident through the array, and to despread the received signal of a code division multiple access method performed for each antenna element. The code correlation result (see Z _{n in} FIG. 4) during the searching (where the searching means searching for a delay time for each communication channel for acquisition of a received signal) ( _where n is an antenna element) Obtaining an index); A second step of adding the code correlation results obtained for each antenna element in the first step; And the result added in the second step (ie N, where N is the number of antenna elements of the antenna array system) is output, so as to be used as a code correlation signal for performing non-coherent reception. It is characterized by processing a signal.

In addition, the signal processing method for detecting a received signal, characterized in that each of the antenna elements are arranged to have a spacing within λ .

Further, in the signal processing method for detecting a received signal, in the first step, the phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel and the magnitude (magnitude) ), The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. do.

Meanwhile, in order to achieve the above object, the present invention is applied to a system of code division multiple access that performs incoherent reception, and in the signal processing apparatus for detecting a received signal, the antenna having a plurality of antenna elements A received signal is processed to perform envelope detection for each antenna element for a plurality of signals incident through the array, and the signal division multiple access method for despreading a received signal of the code division multiple access method performed for each antenna element is performed. In the search (where searching means searching for a delay time for each communication channel for acquisition of a received signal), a code correlation result (see Z _n of FIG. 4, _where n is an antenna element) Index); Means for adding the code correlation results obtained for each antenna element in the means for obtaining the code correlation results; And the result added by said adding means (ie Where N is the number of antenna elements of the antenna array system), and means for outputting the received signal without any additional weight vector calculation, including means for outputting the code correlation signal for performing non-coherent reception. It is characterized by processing.

In addition, the signal processing method for detecting a received signal, characterized in that each of the antenna elements are arranged to have a spacing within λ .

Further, in a signal processing method for detecting a received signal, in the means for obtaining the code correlation result, the phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel. Only the magnitude (magnitude) remains, while the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. It is characterized by.

Meanwhile, in order to achieve the above object, the present invention is applied to a system of code division multiple access that performs incoherent reception, and includes a plurality of antenna elements in a signal processing apparatus having a microprocessor to detect a received signal. A received signal is processed to perform envelope detection for each of the antenna elements for a plurality of signals incident through the antenna array provided with the antenna array, and the received signal of the code division multiple access method performed for each antenna element is processed. Code correlation result (see Z _{n in} FIG. 4) in the process of despreading (where searching means finding a delay time for each communication channel for acquisition of a received signal). n is an antenna element index; A second function of adding up the code correlation results obtained for each antenna element in the first function; And the result added in the second function (i.e. Where N is the number of antenna elements of the antenna array system), so that a computer program containing a program for realizing the third function of outputting such that the non-coherent reception is considered as a code correlation signal can be read. Provide a recording medium.

Meanwhile, in order to achieve the above object, the present invention is applied to a system of code division multiple access that performs incoherent reception, and in the signal processing method for demodulating a received signal, the antenna having a plurality of antenna elements A Walsh demodulation process of a code division multiple access system, which processes received signals to perform envelope detection for each antenna element for a plurality of signals incident through the array, and is performed for each antenna element. in the correlation value of the received signal with each Walsh word first step to obtain (see Fig. 9 of the Z _kn k is the Walsh index word, n is an antenna element index Im); A second step of adding up correlation results of the Walshwords obtained for each antenna element in the first step; And the result added in the second step (i.e. for k = 1, 2, ..., K. Where K is the total number of Walshwords in a given system) and outputs the received signal without any additional weight vector calculation, including the third step of outputting the Walshword to be used as a Walsh demodulation signal for performing non-coherent reception. It is characterized by processing.

In addition, the signal processing method for demodulating the received signal, characterized in that each of the antenna elements are arranged to have a spacing within λ .

Further, in the signal processing method for demodulating a received signal, in the first step, the phase of each interference signal incident on the antenna array disappears in the process of squaring and adding an I-channel and a Q-channel, and an absolute value (magnitude). ), The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. do.

Meanwhile, in order to achieve the above object, the present invention is applied to a system of code division multiple access that performs incoherent reception, and in the signal processing apparatus for demodulating a received signal, the antenna having a plurality of antenna elements A Walsh demodulation process of a code division multiple access system, which processes received signals to perform envelope detection for each antenna element for a plurality of signals incident through the array, and is performed for each antenna element. in the correlation value of the received signal with each Walsh word (see Fig. 9 of the Z _kn k is the Walsh index word, n is an antenna element index Im) means to obtain; Means for adding correlation results of the Walshwords obtained for each antenna element in the means for obtaining the correlation results; And the result added in said adding means (ie for k = 1, 2, ..., K. Provided that K is the total number of Walshwords in a given system), so as to output the signal to be used as a Walsh demodulation signal for performing non-coherent reception. Characterized in that.

In addition, the signal processing method for demodulating the received signal, characterized in that each of the antenna elements are arranged to have a spacing within λ .

Further, in a signal processing method for demodulating a received signal, in the means for obtaining the correlation result, the phase of each interference signal incident on the antenna array disappears in the process of squaring and adding an I-channel and a Q-channel and an absolute value. (magnitude) remains, so that the desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. It features.

Meanwhile, in order to achieve the above object, the present invention is applied to a system of code division multiple access that performs incoherent reception, and includes a plurality of antenna elements in a signal processing apparatus having a microprocessor for demodulating a received signal. The Walsh demodulation of the code division multiple access system is performed by processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements. Correlation result between the received signal and each Walsh word in the Walsh demodulation process (FIG. 9)Z _kn Reference. onlykIs the Walshward index,nIs an antenna element index); A second function of adding up correlation results of the Walshwords obtained for each antenna element in the first function; And the result added in the second function (i.e.fork= 1, 2, ...,K. only,KIs a total number of Walshwords for a given system) is a computer-readable recording containing a program for realizing a third function that outputs a function for use as a Walsh demodulation signal for performing non-coherent reception. Provide the medium.

The above and other objects and features of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings.

To aid in understanding the present technology, [1] AF Naguib, Adaptive Antennas for CDMA Wireless Networks , Ph, D thesis, Stanford University, CA, Aug. 1996 and; [2] JG Proakis, Digital Communications , New York, McGraw-Hill, 3rded., 1995, pp. 41-45; [3] JS Lee, LE Miller, CDMA System Engineering Handbook , Boston, Artech House, 1998, pp. 750-790; [4] D. Shim, S. Choi, "A New Blind Adaptive Algorithm Based On Lagrange's Formula For a Smart Antenna System In CDMA Mobile Communications," Proceedings of IEEE Vehicular Technology Conference (VTC98), Vol. 3, pp. See 1660-1664, Ottawa, Ontario, Canada, 1998.

FIG. 1 is a schematic block diagram illustrating a concept of phase diversity in a base station reception system having N antenna arrays to which the present invention is applied. Referring to the drawings, a processing procedure for demodulating received data for an n-th antenna element is described as an example.

First, a system for performing non-coherent detection is characterized in that the phase of all incoming signals disappears in the process of detecting a desired signal. That is, the above process involves calculating and squaring an in-phase channel (I-channel) and a quadrature channel (Q-channel) and adding the squares. Then the sum of the signals of each antenna element gives the desired signal a gain proportional to the number of antennas, but the interfering signal is changed like an independent noise for each antenna element so that the gain is much smaller than the desired signal. Have. In the present invention, this is referred to as 'phase diversity'. The present invention proposes an antenna array system design technique that provides a diversity gain as described above while arranging a plurality of live antenna elements at element intervals substantially shorter than the wavelength length ( λ ) of a signal.

As can be seen through the preferred embodiment of the present invention, the conditions under which phase diversity can be achieved are as follows.

First, there must be an antenna array. Second, the signal received by the antenna array should be a narrow band signal. Third, nonlinear operation must exist in the process of detecting the desired signal.

Referring now to the structure of FIG. 1, K in the figure is a detection variable that is dependent on a situation. Assuming that M user signals are incident on each antenna as plane waves, the phase difference of each antenna is determined by the incidence angle θ of the desired signal l th user and the antenna element as shown in Equation 1 below. Expressed as a function of the interval d between elements (a more detailed description thereof is introduced in Ref. [1] above)

If the first antenna is used as a reference antenna among the N antennas, and l is added to all the signal subscripts of FIG. 1 to develop a signal for the l- th user, the signals of the I-channel and the Q-channel of the n- th antenna I _nk and Q _nk are represented by the following Equations 1 and 2, respectively.

In the above equation,S ' _mk Is the gain from the previous process,A _m Is the amplitude of the signal,φ _m Is the phase of the signal arriving at the first antenna. Noise will not be considered here for convenience.

Equation (2) and [Equation 3] until the interference phase (interference phase) component is left, but when the two plants squared, the phase becomes meaningless. The term corresponding to the interference signals of Equations 2 and 3 is replaced by Gaussian noise G (0, σ 2) because each incident angle is random. Where σ ² is the sum of each interference power.

In the above formula, S _{l, k} = S ' _{l, k} A _l , and φ _l + ( n -1) Expressed by ( θ _{l, d} ) = φ _{n, l} , Equations 2 and 3 are summarized as Equations 4 and 5, respectively.

And, since Z _{l, k} is the sum of Z _{l, n, k} , it is represented by Equation 6 below.

This is σ ² times noncentral chi-squared RV of 2 * N degrees of freedom, and the pdf of the noncentrality parameter and Z _lk are shown in Equations 7 and 8 below.

Where I _N-1 (·) is modified bessel function of the first kind and order is 'N-1'. At this time, if S _{l, k} = 0, that is, if the desired signal does not exist in the k-th element, b _{l, k} = 0, and Z _{l, k} is σ ² times central chi-squared RV of 2 * N degrees of freedom. The pdf of Z _{l, k} is given by Equation 9 below.

Where Г (·) is a gamma function.

As a result of predicting the improvement of the performance by plotting the above Equation 8 for various N values, when S _{l, k} = 50, sigma ² = 1000, and N is 1, 2, 3, 4 The distribution of is illustrated in FIG.

Through this, it can be seen that the larger N, the gaussian distribution is shown by the central limit theorem. In addition, in the Table 1 and Table 2 calculates the average and variance of the distribution, the mean and variance of when the number of antennas n can be seen that doubling n in the average and variance when N = 1 day. (A basic understanding of this can be obtained from the above reference [2].)

On the other hand, in the case of [Equation 9] in the case where there is no desired signal is the same as in [Equation 8]. That is, when [ sigma ] is equal to [Equation 9] σ ² = 1000 and N is 1, 2, 3, 4, the plot is as shown in FIG. 3 and Table 2, as in the case of FIGS. 2 and 1, as N increases to 1, 2, 3, and 4, the mean and variance increase by 1, 2, 3, and 4 times, respectively. You can see that.

Thus, assuming that the distributions of FIG. 2 are all Gaussian, the SIR is improved by the number of antennas. This is the upper bound of the ideal Diversity Gain. That is, as in the previous case, the SIR increases by the number of antennas. In conclusion, it can be clearly seen that Phase Diversity increases SIR by the number of antennas in an ideal situation.

< Example 1 >

IS-95 Reverse Searcher Application Examples

In the present embodiment, a phase diversity technique according to the present invention is applied to an IS-95 reverse link searcher as an example.

4 is a diagram illustrating an embodiment of a receiving apparatus to which phase diversity is applied to an IS-95 reverse detector according to the present invention.

For convenience of explanation, assume an environment in which signals are received by the N antenna elements at equal intervals within λ. Assuming that the signal magnitudes of all users arriving at the antenna are the same, the signal of the M- users received at the n- th antenna is expressed by Equation 10 below. However, noise is not considered here.

In the above equation, φ _{m, n} is the phase of the signal _where the m- th user reaches the n- th antenna, and P _{I, m} ( t ) and P _{Q, m} ( t ) are the I-channel and Q of the m- th user, respectively. PN code of -channel.

The structure of a searcher using such a received signal is illustrated in FIG. 4. The detector shown in this figure is a case where the detection variable K value corresponds to '1' in the structure of FIG. 1 described above. Therefore, the k subscript is omitted here, and l is added to all the signal subscripts in FIG. 4, so that the value of Z _l for the l- th user can be expressed as shown in Equation 11 below.

Now let's look at the synchronization test. First, let's build two hypotheses. H is the case of perfect synchronization, and H ₀ is the case of no synchronization at all. The conditional probabilities for these assumptions are given by Equations 12 and 13 below. (For a description of this section, see reference [3] above.)

Here, b _l = (2 T * N ) / ( M -0.5), and T is the integral section of the integrator shown in FIG.

Using the two equations (Equation 12 and Equation 13), the acquisition detection probability and the false alarm probability are calculated for a single synchronization test. It is expressed by [Equation 15].

[Equation 14] and [Equation 15]β _T When allied about,P _F versusP _D Get a graph of, When the number of chips to be integrated, that is, the processing gain (PC) is 64 and the number of users is 50, the theoretical and simulation graphs are shown in FIGS. 5 and 6, respectively.

7 and 8 are graphs of P _F versus P _D obtained by theoretical values and simulations, respectively, when the number of antenna elements is one.

From these, it can be seen that the theoretical values and the results of the simulations are almost identical, and that the searching performance is greatly improved when the phase diversity according to the present invention is used. For example, the graph when the number of users is 50 in FIG. 6 and the number of antenna elements is 4 is almost similar to the case where there is one antenna element in FIG. 8 and the number of users is 20. In FIG. Therefore, it can be seen that the SIR in this case is improved by about 2.5 times (4 dB).

< Example 2 >

IS-95 Reverse Demodulator Application Examples

In this embodiment, the case where the phase diversity technique is applied to the IS-95 reverse link demodulator according to the present invention will be described as an embodiment.

FIG. 9 is a diagram illustrating an embodiment of a receiving apparatus to which phase diversity is applied to an IS-95 reverse demodulator according to the present invention. In the structure of FIG. 9, the detection variable K value corresponds to 64 in the structure of FIG. 1.

For the sake of understanding, it is assumed that the demodulator shown in Fig. 9 is perfectly synchronized and that the power of the users provoking the antenna is constant.

When the distances between the antenna elements are equal to or less than λ, and the number of antennas is N and the number of users is M , the signal received at the nth antenna is expressed by Equation 16 below.

Where T _c is one chip duration, I ( t ) is P _m ( t ) W _{m '} ( t ) C _I ( t ), Q ( t - T _c / 2) is P ( t - T _c / 2 ) W _{m '} ( t - T _c / 2) C _Q ( t - T _c / 2), P _m ( t ) is the long code of the mth user, C _I ( t ) and C _Q ( t ) is the base station where short code, φ _{m, n} is the phase of the signal at which the mth user reaches the nth antenna, and W _{m '} ( t ) is the Walsh code of the mth user. m'≤63)

In the receiver of FIG. 9, demodulation is performed by selecting the largest value among the final signals Z _k and Z _k is as follows.

In this embodiment, P _w (/) = 1- P _w ( C ) is used to obtain a word error probability. P _w ( C ) is the probability when the word is correct. For example, Figure is used, the l-th user to sent the W ₁, when said value of the Z _k is β, the equation 18] below is satisfied l-th user of the pseudo noise code (PN code) from the demodulator 9 (The description of this part can be more easily understood by referring to the reference [3] above.)

Therefore, using P _w (/) = 1- Ez ₁ { K ⁶³ ( β )}, the following Equation 19 is obtained.

Here, interference power is σ ² = ( M −1) * T _w . Referring to Equation 19, it can be seen that the word error probability is a function of the number N of antenna elements, the number of users M , and the integration period T _w (= PG). When one word is acquired on the IS-95 reverse link, 256 chips are integrated, so T _w is 256. A graph of P _w (/) obtained by making T _w 256 and increasing N to 1, 2, 3, 4 is shown in FIGS. 10 and 11, respectively.

FIG. 10 is a graph obtained by numerically calculating [Equation 19] to obtain a word error rate when the number is from 5 to 50 users. 11 is a result obtained by computer simulation of the word error rate when the number of users from 15 to 50 people. From these two graphs, we can see that the theoretical and simulated values are almost the same.

If the number of users is 10 or less, the ratio of the error to the value becomes large even when the equation (19) is numerically calculated, and the error probability is too low for the simulation. Thus, the previous graphs show the correct values for more than 15 cases. If the critical word error rate is set to 0.1, the capacity when the number of antenna elements is four is about 40 in FIG. 11, compared to about 15 people when the number of antenna elements is one. It is about 2.7 times (4.3dB) increase.

As can be seen from the above, the phase diversity technique according to the present invention can be used for phase diversity in an antenna array system using non-coherent detection. The number of antenna elements is increased.

In addition, when applied to the IS-95 reverse link demodulator and detector, as the number of antenna elements used for phase diversity increases, BER greatly decreases and search performance increases greatly. In other words, the phase diversity technique according to the present invention is characterized in that the hardware architecture becomes simpler and does not need to obtain a weight having a large amount of computation, compared to the conventional smart antenna system. (This feature can be more readily understood by reference to reference [4] above.)

In addition, since the spacing between antenna elements is not difficult to be applied to a base station as in the case of large path diversity, the phase diversity of the present invention has a great advantage over other systems.

On the other hand, the control algorithm of the received signal processing technique according to the present invention described so far can be implemented in software, the software is RAM, ROM, CD-ROM, hard disk, floppy disk, It will be apparent to those skilled in the art that they can be stored on various recording media, such as magnetic tape.

So far, specific examples have been described, which are intended to help understand the technical idea of the present invention, and are not intended to limit the technical scope of the present invention. In addition, it is apparent to those skilled in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It is not limited to the accompanying drawings.

According to the present invention, the base station receiving system employs an antenna array to selectively receive a signal in a radio signal space, and at the same time, there is no need to calculate a weight vector separately in the process of processing the received signal. By accurately detecting and demodulating functions while eliminating complicated computational processes, the system has a very good effect of improving communication quality and increasing communication capacity while significantly reducing the complexity of system configuration and the burden of signal processing control.

Claims (24)

A method for processing a received signal in a wireless receiving system that performs non-coherent reception, A first step of processing a received signal to perform envelope detection for each antenna element with respect to a plurality of signals incident through an antenna array having a plurality of antenna elements; A second step of adding the envelope detection results obtained in the reception signal processing performed for each antenna element in the first step; And And a third step of outputting the result added in the second step as an envelope detection signal for performing non-coherent reception. A received signal processing method characterized by processing a received signal without additional weight vector calculation. The method of claim 1, And the antenna elements are arranged to have a spacing within λ . The method of claim 2, In the first step, The phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel, and only the magnitude remains. The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. Way. An apparatus for processing a received signal in a wireless receiving system that performs non-coherent reception, Means for processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements; Means for adding the envelope detection results obtained in the reception signal processing performed for each antenna element in the means for processing the received signal; And Means for outputting the result added by said adding means as an envelope detection signal for performing non-coherent reception, A received signal processing apparatus characterized by processing the received signal without the separate weight vector calculation. The method of claim 4, wherein And the antenna elements are arranged to have an interval within λ . The method of claim 5, Means for processing the received signal, The phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel, and only the absolute value (magnituae) remains. The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. Device. In a signal processing apparatus having a microprocessor, in order to process a received signal in a wireless receiving system that performs non-coherent reception, A first signal for processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through the antenna array having a plurality of antenna elements (arranged to have a spacing within λ ) function; A second function of adding an envelope detection result obtained in the reception signal processing performed for each antenna element in the first function; And A third function of outputting the result added by the second function as an envelope detection signal for performing non-coherent reception A computer-readable recording medium containing a program for realizing the problem. The method of claim 7, wherein In the first function, a computer for storing a program for realizing a function such that the phase of each interference signal incident to the antenna array disappears in the process of squaring and adding the I-channels and Q-channels and leaving only an absolute value. Readable record carrier. In the signal processing method for detecting a received signal, applied to a system of code division multiple access method for performing non-coherent reception, A code division multiple access scheme is performed for processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements, and is performed for each antenna element. The code correlation result in the process of searching for despreading the received signal of (where searching means finding the delay time for each communication channel for the acquisition of the received signal).Z _n Reference. onlynIs an antenna element index); A second step of adding the code correlation results obtained for each antenna element in the first step; And The result added in the second step (i.e. (N is the number of antenna elements of the antenna array system) includes a third step of outputting to be used as a code correlation signal for performing non-coherent reception, A signal processing method for detecting a received signal, characterized in that the received signal is processed without additional weight vector calculation. The method of claim 9, And the antenna elements are arranged to have an interval within λ . The method of claim 10, In the first step, The phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel, and only the magnitude remains. The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. Signal processing method for detection. Applied to a system of code division multiple access that performs non-coherent reception, the signal processing apparatus for detecting a received signal, A code division multiple access scheme is performed for processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements, and is performed for each antenna element. A code correlation result ( Z in FIG. 4) during a search for despreading a received signal of FIG., Wherein searching means finding a delay time for each communication channel for acquisition of a received signal. see _{n, where} n is an antenna element index; Means for adding the code correlation results obtained for each antenna element in the means for obtaining the code correlation results; And The result added by said adding means (i.e. Means for outputting such that N is the number of antenna elements of the antenna array system) as a code correlation signal for performing non-coherent reception, A signal processing apparatus for detecting a received signal, characterized in that the received signal is processed without additional weight vector calculation. The method of claim 12, And the antenna elements are arranged to have an interval within λ . The method of claim 13, Means for obtaining the code correlation result, The phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel, and only the magnitude remains. The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. Signal processing device for detection. Applied to a system of code division multiple access that performs non-coherent reception, in a signal processing apparatus having a microprocessor for detecting a received signal, A code division multiple access scheme is performed for processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements, and is performed for each antenna element. A code correlation result ( Z in FIG. 4) during a search for despreading a received signal of FIG. 4, wherein the search means finding a delay time for each communication channel for acquisition of a received signal. see _{n, where} n is an antenna element index; A second function of adding up the code correlation results obtained for each antenna element in the first function; And The result added in the second function (i.e. A third function of outputting such that N is the number of antenna elements of the antenna array system) to be used as a code correlation signal for performing non-coherent reception A computer-readable recording medium containing a program for realizing the problem. The method of claim 15, In the first function, And a program for realizing a function that the phase of each interference signal incident to the antenna array disappears in the process of squaring and adding the I-channels and Q-channels and leaving only an absolute value. In the signal processing method for demodulating the received signal applied to the system of the code division multiple access method for performing non-coherent reception, A code division multiple access system for processing a received signal to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements, wherein each antenna element is performed. a Walsh demodulator (Walsh demodulation) resulting correlation between the received signal and each Walsh word in the process of the first step to obtain (see Fig. 9 of the Z _{k, n} stage k is the Walsh word index, n is the antenna element index Im); A second step of adding up correlation results of the Walshwords obtained for each antenna element in the first step; And The result added in the second step (i.e. for k = 1, 2, ..., K. Provided that K is the total number of Walshwords in a given system), so as to be used as a Walsh demodulation signal for performing non-coherent reception. A signal processing method for demodulating a received signal, characterized in that the received signal is processed without additional weight vector calculation. The method of claim 17, And each antenna element is arranged to have an interval within λ . The method of claim 18, In the first step, The phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel, and only the magnitude remains. The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. Signal processing method for demodulation. A signal processing apparatus for demodulating a received signal, which is applied to a system of a code division multiple access method for performing non-coherent reception, A code division multiple access method system which processes received signals to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements, and is performed for each antenna element. Means for obtaining a correlation result between the received signal and each Walsh word (see Z _{k, n in} FIG. 9 _{, wherein} k is the Walshword index and n is the antenna element index) in the Walsh demodulation process; Means for adding correlation results of the Walshwords obtained for each antenna element in the means for obtaining the correlation results; And The result added by said adding means (i.e. for k = 1, 2, ..., K. Provided that K is the total number of Walshwords in a given system), so as to be used as a Walsh demodulation signal for performing non-coherent reception, A signal processing apparatus for demodulating a received signal, characterized in that the received signal is processed without additional weight vector calculation. The method of claim 20, And the antenna elements are arranged to have an interval within λ . The method of claim 21, In the means for obtaining the correlation result, The phase of each interference signal incident on the antenna array disappears in the process of squaring and adding the I-channel and the Q-channel, and only the magnitude remains. The desired signal (the original signal) obtains a gain proportional to the number of antenna elements, while the interference signal has a much smaller gain than the original signal by making the noise independent of each antenna element. Signal processing device for demodulation. Applied to a system of code division multiple access that performs non-coherent reception, in a signal processing apparatus having a microprocessor for demodulating a received signal, A code division multiple access method system which processes received signals to perform envelope detection for each antenna element for a plurality of signals incident through an antenna array having a plurality of antenna elements, and is performed for each antenna element. A first function of obtaining a correlation result between the received signal and each Walsh word (see Z _{k, n in} FIG. 9 _{, wherein} k is a Walshword index and n is an antenna element index) during Walsh demodulation; A second function of adding up correlation results of the Walshwords obtained for each antenna element in the first function; And The result added in the second function (i.e. for k = 1, 2, ..., K. Provided that K is the total number of Walshwords in a given system) to be used as a Walsh demodulation signal for performing non-coherent reception. A computer-readable recording medium containing a program for realizing the function. The method of claim 23, In the first function, And a program for realizing a function that the phase of each interference signal incident to the antenna array disappears in the process of squaring and adding an I-channel and a Q-channel, and leaving only an absolute value.