JPH08274687A - Cdma radio transmission equipment and cdma radio transmission system - Google Patents

Abstract

PURPOSE: To control the directivity with an adaptive array to perform transmission in a CDMA(code division multiplex access) radio transmission system. CONSTITUTION: The transmission equipment which uses direct spreading CDMA to perform radio communication is provided with an adaptive array 108 consisting of plural antennas, a transmission directivity determining part 104 which determines the optimum directivity of a transmission signal 103 obtained by directly spreading transmission data 101 by a spread code 102 and outputs weight control data 105, and a weight control part 106 which weights each antenna of the adaptive array 108 based on weight control data 105. Thus, the transmission directivity or the transmission signal is controlled to the optimum direction to perform the transmission.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA using an adaptive array used for digital cellular communication or the like.
The present invention relates to a wireless transmission device and a CDMA wireless transmission system.

[0002]

2. Description of the Related Art Conventionally, an adaptive array has been used for SINR (Signal to Interference plus Noise Ratio:
It has been researched and developed as an antenna system that maximizes signal-to-interference plus noise). The principle of the adaptive array is "waveform equalization technology for digital mobile communication".
According to Atsushi Horikoshi, Trikeps Co., Ltd., in an antenna array composed of multiple antennas, the directivity of the array changes when each antenna output is combined by adding amplitude and phase shifts. This is a system that determines the weight of each antenna output based on a certain control algorithm and controls the directivity while adapting to changes in surrounding conditions.

FIG. 20 shows the configuration of an apparatus for controlling the directivity of a desired signal by an adaptive array (hereinafter referred to as a receiving adaptive array). Each antenna output 2 from the adaptive array 1 including a plurality of antenna elements is multiplied by a weight 3 and then combined to form an array output 4. The weight 3 is controlled by the weight controller 6 based on three pieces of information of the combined array output 4, each antenna 2, and the prior knowledge 5 regarding the desired signal.

On the other hand, in a cellular system for mobile communication, an adaptive array is applied to a base station antenna,
Methods for reducing co-channel interference have been studied and reported. In “Improvement of frequency utilization rate by controlling antenna directivity of cellular base station” (Technical Report RCS93-8), directivity is applied not only to received signals but also to transmitted signals in order to eliminate co-channel interference from other cells. A method of imparting sex has been reported. This is because in order to suppress the interference of mobile stations that use the same frequency in other cells, the transmission antenna pattern of the base station is set to the same antenna pattern at the time of reception, and both uplink and downlink have directivity. It is something that can be made. When the antenna of the base station is used for both transmission and reception, the weight vector obtained at the time of reception is used as it is to make the transmission antenna pattern the same as the pattern at the time of reception.

The directivity of the transmission signal is controlled by the adaptive array (hereinafter referred to as the transmission adaptive array).
A configuration example is shown in FIG. The transmission signal 11 is multiplied by the weight 14 determined by the weight control unit 13 using the weight control data 12, and then output from the adaptive array 15 including a plurality of antenna elements.

Further, by using a transmission adaptive array,
FIG. 22 shows a configuration example of the method using the adaptive array for transmission and reception. Each antenna output 22 from the adaptive array 21 including a plurality of antenna elements is multiplied by the reception weight 23 and then combined to form an array output 24. The reception weight control is performed by combining the combined array output 24, each antenna output 22, and prior knowledge 25 about the desired signal.
The weight control unit 26 uses the above three pieces of information.
Then, the transmission signal 27 is multiplied by the same transmission weight 28 as the reception weight 23, and then is output from each antenna of the adaptive array 21 via the duplexer 29.

By the way, the multiple access system targeted by the present invention is a line connection system when a plurality of stations simultaneously communicate in the same band, and is a CDMA (Code Divis).
(ionMultiple Access) is code division multiple access, and is a technique for performing multiple access by spread spectrum communication in which the spectrum of an information signal is spread over a band sufficiently wider than the original information bandwidth. Sometimes referred to as spread spectrum multiple access (SSMS). The direct spread system is a system in which a spread sequence code is directly multiplied by an information signal in spread. In direct sequence CDMA, there is a problem that the strength of the interference wave (communication wave of another station) and the desired wave at the receiving end are the same (distance problem) because multiple communications share the same frequency. Is a prerequisite for realizing a CDMA transmission system. The near-far problem becomes severe with the reception of base stations that receive radio waves from multiple stations at different positions at the same time, and therefore transmission power control according to the state of each transmission line is essential on the mobile station side. . Since an actual received signal is accompanied by fading due to a complicated radio wave propagation environment (multipath) peculiar to mobile communication, a control method and a device therefor become very complicated in order to realize transmission power control with high accuracy.

Conventionally, in CDMA, a number of methods using adaptive array antennas have been studied and reported as measures against interference between other stations. CDMA has a characteristic of being more resistant to interference as compared with FDMA and TDMA, but has a problem that synchronization acquisition becomes difficult, communication quality deteriorates, and communication becomes possible as the number of multiple stations increases. The main reason for this is that the interference between other stations based on the cross-correlation characteristics between spreading codes assigned to other stations is not sufficiently suppressed. Therefore, in the case of a cellular system using CDMA, since there are many other stations that use the same frequency not only in other cells but also in the own cell, it is possible to realize the above-mentioned frequency utilization efficiency if the suppression of interference between other stations can be realized. It is possible to improve the communication quality of each station in the same cell (area) and increase the capacity (the number of multiplexes or the number of line connections).

FIG. 23 shows an example of CDMA transmission using an adaptive array antenna on the receiving side. It is assumed that the first mobile terminal 31 has a reception adaptive array and is in communication with the second mobile terminal 32 having an omnidirectional antenna. At this time, the first mobile terminal 31 can eliminate the delayed waves 33 and 34 by controlling the directivity, and can suppress the interference wave from the third mobile terminal 35 that uses the same frequency.

[0010]

However, in the above-mentioned conventional CDMA communication apparatus, the method of using the adaptive array antenna as a countermeasure against the interference between other stations is a method realized by controlling the antenna directivity at the receiving station. And, the study on the antenna system of the transmitting station was insufficient. Transmitting with an omnidirectional antenna or a fixed directional antenna at the transmitting station causes interference that is not suppressed at all with respect to other stations existing in the area covered by the transmitting antenna (inter-station interference). Will be given. Further, even in receiving stations located at different places, desired waves propagating through different routes are received at various angles with respect to the receiving antenna, so that the received signal undergoes fading fluctuation.
Fading fluctuation deteriorates communication quality, error control, A
Measures such as GC (Auto Gain Control) and transmission power control are required. In the direct sequence CDMA, when the spread bandwidth does not have a sufficient band with respect to the fluctuation of the frequency selective fading, the transmission power control generally requires the control that follows the fading fluctuation, which is highly accurate. Realization of transmission power control is required.

The present invention solves such a conventional problem, and by using an adaptive array in a transmitting station of a CDMA transmission apparatus to control the directivity of a transmitting antenna for transmission, Error control by reducing the interference given to the station (inter-station interference) and suppressing the fading fluctuation of the received signal at the receiving station at the same time,
An object of the present invention is to provide an excellent CDMA wireless transmission device and a system thereof that can reduce the burden on AGC, transmission power control, and the like.

[0012]

In order to achieve the above object, the present invention provides an adaptive array composed of a plurality of antennas and a transmission signal in a transmission device which performs wireless communication using direct spread CDMA. The transmission directivity determining means for determining the optimum directivity and the weight control means for assigning a weight to each antenna based on the determined transmission directivity.

The present invention also provides an adaptive array comprising a plurality of antennas in a transmission apparatus for performing wireless communication using a direct sequence CDMA, and at the time of reception,
In order to optimally control the directivity of the desired signal, a predetermined weight is given to each antenna, and at the time of transmission, the weight used for reception is given to each antenna to optimize the directivity of the transmitted signal. And weight control means for controlling.

[0014]

Therefore, according to the present invention, the transmitting side, for the transmission signal obtained by spreading the transmission data with the spreading code, outputs the weight determined by obtaining the optimum directivity of the transmission signal to the output of each antenna. After multiplying, by outputting from each antenna, the directivity of the transmission signal can be controlled and transmitted. As a result, interference given to other stations is reduced, and at the same time, fading fluctuations of the received signal are suppressed at the receiving station, and the burden on error control, AGC, transmission power control, etc. can be reduced.

Further, according to the present invention, the directivity of the desired signal at the time of reception and the directivity of the signal at the time of transmission is controlled by using the adaptive array. Therefore, by controlling the directivity of the desired signal, It is also possible to control the directivity of the signal at the same time, which reduces the interference given to other stations, and at the same time, suppresses the fading fluctuation of the received signal at the receiving side, thereby performing error control, AGC, and transmission. The burden on power control etc. can be reduced.

Further, according to the present invention, in the transmission power control, not only the circuit configuration is simplified, but also the control range width is reduced and the transmission power per unit area is increased, so that the average transmission power can be reduced. As a result, in a battery-powered terminal, it is possible to extend the operating time and the service life by reducing the power consumption.

[0017]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a CDMA for controlling the directivity of a transmission signal using the second adaptive array of the invention in this embodiment.
The structural example of a transmitter is shown. The transmission data 101 is spread by the spreading code 102 to form a transmission signal 103, and the transmission signal 103 uses the weight control data 105 from the transmission directivity determination unit 104 to adaptively weight the weight 107 determined by the weight control unit 106. After being multiplied by each antenna element forming the array 108, it is output from each antenna element.

FIG. 2 shows an example of a configuration in which the transmission power control is performed together with the directivity control of the transmission signal. The transmission data 201 is spread by the spreading code 202 and becomes a transmission signal 203. The weight 207 determined by the weight control / transmission power control unit 206 using the weight control data 205 from the transmission directivity determination unit 204 and the transmission power 209 controlled by the transmission power control data 208 are 1
After being originally processed, it is output from the adaptive array 210 including a plurality of antenna elements 209.

FIGS. 1 and 2 above show direct spread CDMA.
Only one channel of the transmitter is shown. On the other hand, FIG. 3 shows an example of the configuration of a CDMA transmission device when transmitting N channels with different directivities such as in a base station. Reference numeral 301 denotes a transmission unit for each channel, which has the same configuration as in FIG. Then, the outputs of the respective channels are multiplexed by the combiner (or adder) 302 and output from the adaptive array 303 including a plurality of antenna elements. The modulator (PSK modulation, etc.) is omitted in FIGS. 1 to 3.

4 to 6 show examples of the structure of the transmission directivity determining unit for obtaining the transmission weight control data. When the position of the own station constantly changes like a mobile station, as shown in FIG. 4, the position of the own station is obtained by the GPS receiver 401 and stored in advance (or obtained from control data or the like) base station. The transmission directivity calculation circuit 404 determines the directivity (direction) of the transmission signal from the position data 402 and the surrounding propagation path characteristic data 403, and outputs the transmission weight control data 405.

When the local station is a fixed station such as a base station, as shown in FIG. 5, the mobile station transmits position data detected by GPS or the like through a control channel or the like, The mobile station position data detection circuit 501 knows the position of the mobile station, and based on the base station position data 502 stored in advance (or obtained from the control data or the like) and the peripheral propagation path characteristic data 503, the transmission directivity calculation circuit. At 504, the directivity (direction) of the transmission signal is determined, and transmission weight control data 505 is output.

Further, when the positions of both communicating parties are constantly changing as mobile stations, as shown in FIG. 6, the GPS receiver 601 obtains the position of the own station, and the partner station sends GPS signals.
The mobile station position data detection circuit 603 obtains the position information of the partner station from the data 602 of the position data detected by the control channel or the like, and further the transmission directivity calculation circuit 605 from the surrounding propagation path characteristic data 604 or the like. At, the directivity (direction) of the transmission signal is determined and the transmission weight control data 606 is output.

FIG. 7 shows the concept of CDMA transmission using an adaptive array antenna on the transmitting side. It is assumed that the first mobile terminal 701 has a transmission adaptive array and is in communication with a second mobile terminal 702 having a directional antenna. The first mobile terminal 701 is equipped with the CDMA transmitter of FIG. 1 and controls the directivity of the transmission signal so that the third and fourth mobile terminals 7 use the same frequency.
It is possible to suppress the interference wave to 03 and 704. In addition, by transmitting with directivity, the antenna of the receiving station is different through different propagation paths, which occurs when the second mobile terminal 32 shown in FIG. 23 transmits with an omnidirectional antenna. Delayed waves 33, 3 arriving in direction and time
4 can be eliminated.

As described above, according to the present embodiment, in the transmission device which performs wireless communication using the direct spreading CDMA, the adaptive array composed of a plurality of antenna elements and the optimum directivity of the transmission signal are provided. Since the transmission directivity determining means for determining the above and the weight control means for assigning a weight to each antenna based on the determined transmission directivity are provided, interference given to other stations is reduced, and at the same time, the receiving station In, the fading fluctuation of the received signal is suppressed, and the burden on error control, AGC, transmission power control, etc. can be reduced.

(Second Embodiment) Next, a second embodiment of the present invention will be described. FIG. 8 shows a configuration example of a CDMA radio transmission apparatus using a transmission / reception adaptive array antenna that controls directivity of a desired signal at the time of reception and a transmission signal at the time of transmission by using the adaptive array according to the second embodiment of the present invention. . Each antenna output 802 from an adaptive array 801 composed of a plurality of antenna elements is multiplied by a reception weight 803 and then combined to form an array output 804.
Becomes Then, it is despread by the spreading code 805, and becomes reception data 806 after detection and binary judgment. The reception weight 803 is controlled by combining the array output 80
4 and each antenna output 802 and three pieces of information of the prior knowledge 815 regarding the desired signal are used in the weight control / transmission power control unit 815. At this time, the despread signal may be used instead of the combined array output 804.

The transmission data 808 is spread by the spreading code 809 to form a transmission signal 810, which is the transmission signal 810.
Based on the result of the reception weight 803 and the transmission power control data 811, the weight control / transmission power control unit 807
Transmission weight 812 and transmission power 813 determined in
After being unitarily multiplied by, the signal is output from the adaptive array 801 via the duplexer 814.

In the present embodiment, as the method of determining the transmission weight 812, since the antenna of the wireless station is used for both transmission and reception, the weight vector obtained at the time of reception is used as it is, so that the transmission antenna pattern is the same as the pattern at the time of reception. Can be That is, the transmitting antenna pattern of the CDMA signal is set to be exactly the same as the receiving antenna pattern so that both reception and transmission have directivity.

On the other hand, FDD (Frequency Devision Duple)
When the transmission / reception frequency is different as in (x), the transmission / reception antenna pattern is different, so it is possible to optimize the weight value used on the transmission side. "Improvement of frequency utilization rate by controlling antenna directivity of cellular base station"
As shown in (Technical Report RCS93-8), there is a method of regenerating the weight value so as to minimize the mean square error between the transmitting and receiving antenna patterns.

Further, even when the transmission / reception frequency is the same as in TDD (Time Division Duplex), the reception antenna pattern may not be optimal at the time of transmission due to the median variation and the instantaneous value variation due to fading. It is possible to optimize the weight value to be used by estimating the propagation path state of. FIG. 9 shows an example thereof.
The propagation path state at the time of transmission is estimated from the despread signal 901 by the propagation path estimation circuit 902, and the transmission weight control circuit 9 optimizes the transmission directivity together with the reception weight 903.
This is a method of regenerating the transmission weight value 905 in 04.
In this case, in addition to the despread signal, use of a signal after detection and information (weighting coefficient, size of combined signal, etc.) at the time of path diversity (RAKE reception, etc.) can be considered.

Next, FIG. 10 shows a configuration example of a CDMA transmitting / receiving apparatus in the case of transmitting and receiving N channels with different directivities such as a base station. Reference numeral 1001 denotes a transmission / reception unit for each channel, which has the same configuration as in FIG. And
The outputs of the respective channels are multiplexed by the combiner (or adder) 1002 and output from the adaptive array 1003 including a plurality of antenna elements. 8 and 10
The modulator (PSK modulation, etc.) is omitted in FIG.

As described above, according to the present embodiment, since the directivity of the desired signal at the time of reception and the transmitted signal at the time of transmission is controlled by using the adaptive array, the directivity of the desired signal is controlled. Therefore, it becomes possible to control the directivity of the transmission signal at the same time, thereby reducing the interference given to other stations, and at the same time, suppressing the fading fluctuation of the reception signal on the receiving side, thereby performing error control, AG
The burden on C, transmission power control, etc. can be reduced.

(Embodiment 3) Next, a third embodiment of the present invention will be described. FIG. 11 shows a configuration example of a CDMA transmission system using a transmission adaptive array antenna as a base station in the third embodiment of the present invention. Base station 1101
Is in communication with each of the mobile stations 1102, 1103, 1104 with a transmit adaptive array and with omnidirectional antennas. The base station 1101 includes the CDMA transmitter of FIG. 3 shown in the first embodiment, and the operation of the transmission adaptive array is the same as that of the first embodiment. FIG. 5 shows an example of the transmission directivity determining unit 104 for obtaining the transmission weight control data, and the operation is the same as that in the first embodiment. Further, each mobile station 1102-1104 is provided with a CDMA receiver as shown in FIG. That is, the antenna 18
The antenna output from 01 is despread by the spreading code 1802 and becomes received data 1803.

Since the present embodiment is configured as described above, the base station controls the directivity of the transmission signal to the mobile station so that other mobile stations and other mobile stations that use the same frequency in the downlink. It is possible to suppress interference with the cell. Further, it becomes possible to eliminate a delayed wave that reaches the antenna of the receiving station through different propagation paths, and suppress fading fluctuation of the received signal.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. FIG. 12 shows a configuration example of a CDMA transmission system using a transmission / reception adaptive array antenna in the base station in this embodiment. The base station 1201 includes a reception adaptive array and a transmission adaptive array, and each mobile station 1202, 12 including an omnidirectional antenna.
03, 1204. Base station 12
01 includes the CDMA transmission apparatus of FIG. 10 shown in the second embodiment, and the operation of each adaptive array is the same as that of the second embodiment. Each of the mobile stations 1202 to 1204 includes a CDMA receiver as shown in FIG. 18, and the operation is the same as in the third embodiment. Further, each mobile station 1202 to 1204 includes a CDMA transmitter as shown in FIG. That is, the transmission data 1901 is spread by the spreading code 1902 and output from the antenna 1903 as a transmission signal.

Since the present embodiment is configured as described above, the base station controls the received signal from each mobile station to prevent interference from other mobile stations and other cells in the uplink. It becomes possible to suppress the delayed waves that arrive through different propagation paths, and suppress fading fluctuation of the received signal. In addition, the base station
By controlling the directivity of the transmission signal, interference with other mobile stations and other cells that use the same frequency in the downlink is suppressed. Then, it is possible to suppress the fading fluctuation by eliminating the delayed wave that reaches the antenna of the mobile station through different propagation paths. In addition, since the base station is provided with the up-and-down line adaptive array apparatus only in the base station, the load on the hardware scale of the mobile station can be reduced.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described. FIG. 13 shows a configuration example of a CDMA transmission system using a transmission adaptive array antenna for the mobile station in this embodiment. Each mobile station 1302, 130
3, 1304 are base stations 130 each having a transmission adaptive array and an omnidirectional antenna or a fixed directional antenna.
Assume that it is communicating with 1. Each mobile station 1302-13
04 includes the CDMA transmitter of FIG. 1 or 2 shown in the first embodiment, and the operation of the transmission adaptive array is the same as that of the first embodiment. FIG. 4 shows an example of the transmission directivity determining units 104 and 204 for obtaining the transmission weight control data, and a base station that obtains its own position by the GPS receiver and stores it in advance (or obtains it by the control data etc.) The directivity of the transmission signal is determined from the station position data and the surrounding propagation path characteristic data. The base station 1301 uses the CDMA receiver as shown in FIG. 18 for N channels (N ≧ 1).
In addition, the CDMA transmitter as shown in FIG.
The number of channels (N ≧ 1) is provided, and the operation is the same as in the fourth embodiment.

Since the present embodiment has the above-mentioned configuration, the mobile station controls the directivity of the transmission signal to the base station to prevent interference with other cells using the same frequency in the uplink. Can be suppressed. Further, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths, and suppress fading fluctuation of the received signal at the base station.

(Embodiment 6) Next, a sixth embodiment of the present invention will be described. FIG. 14 shows a configuration example of a CDMA transmission system using a transmission / reception adaptive array antenna for the mobile station in this embodiment. Mobile stations 1402, 140
3, 1404 are provided with a reception adaptive array and a transmission adaptive array, and are in communication with a base station 1401 having an omnidirectional or fixed directional antenna. Each mobile station 1402-1404 is equipped with the CDMA transmission apparatus of FIG. 8 shown in the second embodiment, and the operation is the same as in the second embodiment. The base station 1401 is a CD as shown in FIG.
An MA receiver is provided for N channels (N ≧ 1), and a CDMA transmitter as shown in FIG. 19 is provided for N channels (N ≧ 1).
≧ 1) and the operation is similar to that of the fourth embodiment.

Since the present embodiment is configured as described above, each mobile station suppresses the received signal from the base station, so that interference from other mobile stations and other cells can be prevented in the downlink. It becomes possible to suppress the delayed waves that arrive through different propagation paths, and suppress fading fluctuation of the received signal. Further, the mobile station suppresses interference with other mobile stations and other cells that use the same frequency in the uplink by controlling the directivity of the transmission signal. Then, the delayed wave reaching the antenna of the mobile station through different propagation paths is eliminated, and fading fluctuation can be suppressed.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described. FIG. 15 shows a configuration example of a CDMA transmission system using adaptive array antennas for both the base station and the mobile station in this embodiment. Base station 150
1 and each mobile station 1502, 1503, 1504 are equipped with a transmission adaptive array and are in communication with each other. Each mobile station 1502-1504 includes the CDMA transmitter of FIG. 1 or 2 shown in the first embodiment, and the operation of the transmission adaptive array is the same as that of the first embodiment. Transmission directivity determination unit 1 for obtaining transmission weight control data
There is FIG. 4 as an example of 04 and 204. From the base station position data and the surrounding propagation path characteristic data etc. which are obtained by obtaining the position of the own station by the GPS receiver and stored in advance (or obtained by the control data etc.), Determines the directivity of the transmitted signal. Further, each mobile station 1502-1504 is equipped with a CDMA receiver as shown in FIG. 18, and the operation is the same as in the third embodiment.

The base station 1501 shown in FIG.
The operation of the transmission adaptive array is the same as that of the first embodiment. FIG. 5 is an example of the transmission directivity determining unit 204 for obtaining the transmission weight control data, and the position of the mobile station is transmitted by transmitting the position data detected by each mobile station 1502-1504 by GPS or the like through the control channel or the like. Then, the directivity of the transmission signal is determined and controlled from the base station position data and the surrounding propagation path characteristic data which are stored in advance. Further, the CDMA receiver as shown in FIG. 18 is provided for N channels (N ≧ 1), and the operation is the same as that of the third embodiment.

Since the present embodiment is configured as described above, the mobile station controls the directivity of the transmission signal to the base station, so that the mobile station interferes with other cells using the same frequency in the uplink. Can be suppressed. Further, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths, and suppress fading fluctuation of the received signal at the base station.

On the other hand, the base station can suppress the interference with other mobile stations and other cells that use the same frequency in the downlink by controlling the directivity of the transmission signal to the mobile station. Further, it becomes possible to eliminate a delayed wave that reaches the antenna of the mobile station through different propagation paths, and suppress fading fluctuation of the received signal at the mobile station.

(Embodiment 8) Next, some variations of the present invention will be described with reference to the same FIG. The eighth embodiment of the present invention is an example of a CDMA transmission system using a transmission adaptive array antenna for a base station and a reception adaptive array antenna for a mobile station. It is assumed that the base station 1501 includes a transmission adaptive array, and each mobile station 1502, 1503, 1504 includes a reception adaptive array and is in communication with each other.

The base station 1501 shown in FIG.
The operation of the transmission adaptive array is the same as that of the first embodiment.

Each mobile station 1502-1504 is equipped with a CDMA receiver as shown in FIG. 16, and performs reception while optimally controlling the directivity of the desired signal. The operation is the same as that of the reception adaptive array shown in FIG. 7 of the second embodiment. That is, each antenna output 1602 from the plurality of antenna elements 1601 is multiplied by the reception weight 1603,
The combined output is the array output 1604. Then, it is despread by the spreading code 1605, and becomes reception data 1606 after detection and binary judgment. Receive weight 1600
The control of No. 3 is performed by the weight control unit 1608 based on three pieces of information of the combined array output 1604, each antenna output 1602, and prior knowledge 1607 regarding the desired signal. At this time, a signal after despreading may be used instead of the combined array output 1604.

According to this embodiment, the base station suppresses interference with other mobile stations and other cells that use the same frequency in the downlink by controlling the directivity of the transmission signal to the mobile station. You can Also, the mobile station can suppress interference from other cells that use the same frequency in the downlink by controlling the directivity of the received signal. Furthermore, it becomes possible to eliminate delayed waves that reach the antenna of the mobile station through different propagation paths,
It is possible to suppress fading fluctuation of the received signal in the mobile station.

(Embodiment 9) Next, regarding a ninth embodiment of the present invention, a transmission adaptive array antenna is transmitted to a base station,
C using a transmit / receive adaptive array antenna for a mobile station
An example of the DMA transmission system will be described with reference to FIG.
It is assumed that the base station 1501 has a transmission adaptive array, and the mobile stations 1502-1504 have a transmission / reception adaptive array and are communicating with each other.

The base station 1501 shown in FIG.
The operation of the transmission adaptive array is the same as that of the first embodiment. Further, the CDMA receiver as shown in FIG. 18 is provided for N channels (N ≧ 1), and the operation is the same as that of the third embodiment.

The mobile stations 1502-1504 are the same as those in the second embodiment.
8 is provided and the operation is similar to that of the second embodiment.

According to this embodiment, the base station suppresses interference with other mobile stations and other cells that use the same frequency in the downlink by controlling the directivity of the signal transmitted to the mobile station. You can Also, by controlling the received signal, the mobile station can suppress the interference from other cells in the downlink and eliminate the delayed wave arriving through a different propagation path. The fading fluctuation can be suppressed. Further, the mobile station suppresses interference with other mobile stations and other cells that use the same frequency in the uplink by controlling the directivity of the transmission signal. Then, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths.

(Embodiment 10) Next, with respect to a tenth embodiment of the present invention, an example of a CDMA transmission system using a receiving adaptive array antenna for a base station and a transmitting adaptive array antenna for a mobile station will be described with reference to FIG. Explain. The base station 1501 includes a reception adaptive array,
It is assumed that the mobile stations 1502-1504 are equipped with a transmission adaptive array and are in communication with each other.

The mobile stations 1502-1504 are the same as those in the first embodiment.
2 and the operation of the transmission adaptive array is the same as that of the first embodiment. FIG. 4 shows an example of the transmission directivity determination unit 204 for obtaining the transmission weight control data, and the operation is the same as that in the first embodiment.

Further, the base station 1501 is provided with a CDMA receiving apparatus having a receiving section 1701 having an N-channel structure as shown in FIG. 17 and an adaptive array 1702, and receiving while controlling the directivity of a desired signal optimally. I do. The operation of each channel is similar to that of the reception adaptive array shown in FIG. 16 of the eighth embodiment.

According to this embodiment, the mobile station suppresses interference with other mobile stations and other cells that use the same frequency on the uplink by controlling the directivity of the transmission signal to the base station. You can Also, the base station can suppress interference from other mobile stations and other cells that use the same frequency in the uplink by controlling the directivity of the received signal. Further, it becomes possible to eliminate the delayed wave reaching the antenna of the base station through different propagation paths, and suppress fading fluctuation of the received signal at the base station.

(Embodiment 11) Next, with respect to an eleventh embodiment of the present invention, an example of a CDMA transmission system using a receiving adaptive array antenna for a base station and a transmitting / receiving adaptive array antenna for a mobile station will be described with reference to FIG. Explain. It is assumed that the mobile stations 1502-1504 are equipped with a transmission / reception adaptive array and are in communication.

The mobile stations 1502-1504 are the same as those in the first embodiment.
8 is provided, and the operation of the transmission / reception adaptive array is the same as that of the first embodiment.

The base station 1501 is equipped with a CDMA receiver as shown in FIG. 17, and performs reception while optimally controlling the directivity of the desired signal. The operation is similar to that of the tenth embodiment. Also, the base station 1501 is a CD as shown in FIG.
The MA transmitter is provided for N channels (N ≧ 1), and the operation is the same as that of the fourth embodiment.

According to this embodiment, the base station can suppress the interference from other mobile stations and other cells that use the same frequency in the uplink by controlling the directivity of the received signal. Then, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths.

Further, by controlling the received signal, the mobile station can suppress the interference from other cells in the downlink and eliminate the delayed wave arriving through a different propagation path. As a result, fading fluctuation of the received signal can be suppressed. Furthermore, the mobile station can suppress interference with other mobile stations and other cells that use the same frequency in the uplink by controlling the directivity of the transmission signal. Then, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths.

(Embodiment 12) Next, with respect to a twelfth embodiment of the present invention, an example of a CDMA transmission system using a transmitting / receiving adaptive array antenna for a base station and a transmitting adaptive array antenna for a mobile station will be described with reference to FIG. Explain. It is assumed that the base station 1501 has a transmission / reception adaptive array, and the mobile stations 1502-1504 have a transmission adaptive array and are communicating with each other.

The mobile stations 1502-1504 are the same as those in the first embodiment.
2 is provided, and the operation of the transmission / reception adaptive array is the same as that of the first embodiment. Transmission directivity determination unit 204 for obtaining transmission weight control data
4 is shown as an example, and the operation is similar to that of the first embodiment. Further, each mobile station 1502-1504 is equipped with a CDMA receiver as shown in FIG. 18, and the operation is the same as in the third embodiment.

The base station 1501 is a CD as shown in FIG.
The operation of each adaptive array having the MA transmission device is the same as that of the second embodiment.

According to this embodiment, the mobile station can suppress the interference with other cells using the same frequency in the uplink by controlling the directivity of the transmission signal to the base station. Further, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths, and suppress fading fluctuation of the received signal at the base station.

Further, the base station can suppress the interference from other mobile stations and other cells in the uplink by controlling the received signal, and can eliminate the delayed wave arriving through a different propagation path. In addition to being possible, fading fluctuation of the received signal can be suppressed. Furthermore, the base station can suppress interference with other mobile stations and other cells that use the same frequency in the downlink by controlling the directivity of the transmission signal. Then, it is possible to suppress the fading fluctuation by eliminating the delayed wave that reaches the antenna of the mobile station through different propagation paths.

(Embodiment 13) Next, referring to FIG. 15, for a thirteenth embodiment of the present invention, referring to FIG. 15, an example of a CDMA transmission system using a transmitting / receiving adaptive array antenna for a base station and a receiving adaptive array antenna for a mobile station. Explain. It is assumed that the base station 1501 includes a transmission / reception adaptive array, and the mobile stations 1502-1504 include a reception adaptive array for communication.

The mobile stations 1502-1504 are the same as the eighth embodiment.
16 is provided and the operation of the reception adaptive array is the same as that of the eighth embodiment. Also, each mobile station 1502-1504 has a CD as shown in FIG.
An MA transmitter is provided, and the operation is the same as in the fourth embodiment.

The base station 1501 is a C station as shown in FIG.
A DMA transmission device is provided, and the operation of each adaptive array is the same as in the second embodiment.

According to this embodiment, the mobile station can suppress the interference from other cells that use the same frequency in the downlink by controlling the directivity of the received signal from the base station. In addition, it becomes possible to eliminate the delayed wave that reaches the antenna of the base station through different propagation paths, and at the same time, suppress fading fluctuation of the received signal.

Further, the base station can suppress the interference from other mobile stations and other cells in the uplink by controlling the received signal, and can eliminate the delayed wave arriving through a different propagation path. It becomes possible, and at the same time, fading fluctuation of the received signal can be suppressed. Furthermore, the base station can suppress interference with other mobile stations and other cells that use the same frequency in the downlink by controlling the directivity of the transmission signal. Then, it is possible to suppress the fading fluctuation by eliminating the delayed wave that reaches the antenna of the mobile station through different propagation paths.

(Embodiment 14) Next, a thirteenth embodiment of the present invention will be described with reference to FIG. 15 showing an example of a CDMA transmission system using a transmission / reception adaptive array antenna for a base station and a mobile station. It is assumed that the base station 1501 and the mobile stations 1502-1504 are equipped with a transmission / reception adaptive array and are communicating with each other.

The mobile stations 1502-1504 are equipped with the CDMA transmission apparatus of FIG. 2 shown in the first embodiment, and operate in the first embodiment.
Is the same as

The base station 1501 is equipped with a CDMA transmission device as shown in FIG. 10, and its operation is the same as that of the second embodiment.

According to the present embodiment, the mobile station suppresses interference from other mobile stations and other cells in the downlink by controlling the received signal, and delay waves that arrive through different propagation paths. It becomes possible to eliminate
It is also possible to suppress fading fluctuation of the received signal. further,
By controlling the directivity of the transmission signal, the mobile station can suppress interference with other mobile stations and other cells that use the same frequency in the uplink. Then, it becomes possible to suppress the fading fluctuation by eliminating the delayed wave that reaches the antenna of the base station through different propagation paths.

Similarly, the base station suppresses interference from other mobile stations and other cells in the uplink by controlling the received signal, and eliminates delayed waves arriving through different propagation paths. It is possible to suppress the fading fluctuation of the received signal at the same time. In addition, the base station
By controlling the directivity of the transmission signal, it is possible to suppress interference with other mobile stations and other cells that use the same frequency in the downlink. Then, it is possible to suppress the fading fluctuation by eliminating the delayed wave that reaches the antenna of the mobile station through different propagation paths.

[0076]

As is apparent from the above-described embodiments, the present invention is such that the transmitting side multiplies a transmission signal obtained by spreading transmission data by a spreading code with a weight and outputs the result from each antenna, thereby transmitting antennas. It becomes possible to control directivity and transmit. As a result, the interference given to other stations and other cells is reduced, and at the same time, fading fluctuations of the received signal are suppressed at the receiving side, and the burden on error control, AGC, transmission power control, etc. is reduced. You can

Further, according to the present invention, the directivity of the desired signal at the time of reception and the directivity of the signal at the time of transmission is controlled by using the adaptive array. It is also possible to control the directivity of the signal at the same time, which reduces the interference given to other stations, and at the same time suppresses the fading fluctuation of the received signal at the receiving side, thereby performing error control, AGC, and transmission. The burden on power control etc. can be reduced.

Further, according to the present invention, in the transmission power control, not only the circuit configuration is simplified, but also the control range width is reduced and the transmission power per unit area is increased, so that the average transmission power can be reduced. As a result, in a battery-powered terminal, it is possible to extend the operating time and the service life by reducing the power consumption.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a configuration example of a CDMA transmission device according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram showing another configuration example of the CDMA transmission device in the first exemplary embodiment of the present invention.

FIG. 3 is a schematic block diagram showing still another configuration example of the CDMA transmission device in the first exemplary embodiment of the present invention.

FIG. 4 is a schematic block diagram showing a configuration example of a transmission directivity determining unit in the first embodiment of the present invention.

FIG. 5 is a schematic block diagram showing another configuration example of the transmission directivity determining unit in the first embodiment of the present invention.

FIG. 6 is a schematic block diagram showing still another configuration example of the transmission directivity determining unit in the first embodiment of the present invention.

FIG. 7 is a schematic diagram showing the concept of a CDMA wireless transmission system in the first embodiment of the present invention.

FIG. 8 is a schematic block diagram showing a configuration example of a CDMA transceiver device according to a second embodiment of the present invention.

FIG. 9 is a schematic block diagram showing a configuration example of a TDD transmission weight control unit in the second embodiment of the present invention.

FIG. 10 is a schematic block diagram showing another configuration example of the CDMA transceiver apparatus according to the second embodiment of the present invention.

FIG. 11 is a schematic diagram showing the concept of a CDMA wireless transmission system in a third embodiment of the present invention.

FIG. 12 is a schematic diagram showing the concept of a CDMA wireless transmission system according to a fourth embodiment of the present invention.

FIG. 13 is a schematic diagram showing the concept of a CDMA wireless transmission system in a fifth embodiment of the present invention.

FIG. 14 is a schematic diagram showing the concept of a CDMA wireless transmission system in a sixth embodiment of the present invention.

FIG. 15 is C in the seventh to fourteenth embodiments of the present invention.
Schematic diagram showing the concept of a DMA wireless transmission system

FIG. 16 is a schematic block diagram showing a configuration example of a CDMA receiving device according to an eighth embodiment of the present invention.

FIG. 17 is a schematic block diagram showing another configuration example of the CDMA receiver in the eighth exemplary embodiment of the present invention.

FIG. 18 is a schematic block diagram showing a configuration example of a CDMA receiving device according to an embodiment of the present invention.

FIG. 19 is a schematic block diagram showing another configuration example of the CDMA receiver in the embodiment of the present invention.

FIG. 20 is a schematic block diagram showing a configuration example of a conventional CDMA receiving device.

FIG. 21 is a schematic block diagram showing a configuration example of a conventional CDMA transmission device.

FIG. 22 is a schematic block diagram showing a configuration example of a conventional CDMA transceiver device.

FIG. 23 is a schematic diagram showing the concept of a conventional CDMA wireless transmission system.

[Explanation of symbols]

108, 210, 303, 801, 1003, 160
1, 1702 Adaptive array 104, 204 Transmission directivity determination unit 106, 1608 Transmission weight control unit 206, 807 Weight control / transmission power control unit

Claims (19)

[Claims] 1. A transmission device for performing wireless communication using direct sequence CDMA, an adaptive array comprising a plurality of antennas, a transmission directivity determining means for determining an optimum directivity of a transmission signal, and a determination. A CDMA radio transmission apparatus including weight control means for giving a weight to each antenna based on the determined transmission directivity. 2. In a transmission device for performing wireless communication using direct sequence CDMA, an adaptive array composed of a plurality of antennas, and a predetermined value for optimally controlling the directivity of a desired signal at the time of reception are set. And a weight control means for optimally controlling the directivity of the transmission signal by giving the weight used for reception to each antenna at the time of transmission.
DMA wireless transmission device. 3. In a transmission system for performing wireless communication using direct sequence CDMA, a base station determines an adaptive array composed of a plurality of antennas and a transmission directivity determination for determining an optimum directivity of a transmission signal. A CDMA radio transmission system comprising: a means and a weight control means for giving a weight to each antenna based on the determined transmission directivity, and a mobile station having an omnidirectional antenna. 4. A transmission system for performing wireless communication using direct sequence CDMA, in which a base station optimally controls an adaptive array including a plurality of antennas and a directivity of a desired signal at the time of reception. And a weight control means for optimally controlling the directivity of the transmission signal by assigning the weight used for reception to each antenna at the time of transmission while assigning a predetermined weight to each antenna. CD with omnidirectional antenna
MA wireless transmission system. 5. In a transmission system for performing wireless communication using direct sequence CDMA, a mobile station determines an adaptive array including a plurality of antennas and a transmission directivity determination for determining an optimum directivity of a transmission signal. A CDMA radio transmission system, which comprises: means and a weight control means for giving a weight to each antenna based on the determined transmission directivity, and in which the base station has an omnidirectional or fixed directional antenna. 6. In a transmission system for performing wireless communication using direct sequence CDMA, a mobile station optimally controls the directivity of a desired signal at the time of reception and an adaptive array composed of a plurality of antennas. And a weight control means for optimally controlling the directivity of the transmission signal by assigning the weight used for reception to each antenna at the time of transmission while assigning a predetermined weight to each antenna. Is a CDMA wireless transmission system having an omnidirectional or fixed directional antenna. 7. A transmission system for performing wireless communication using direct sequence CDMA, in which a base station and a mobile station transmit an adaptive array composed of a plurality of antennas and an optimum directivity of a transmission signal. The CDM includes directivity determining means and weight control means for assigning a weight to each antenna based on the determined transmission directivity.
A wireless transmission system. 8. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station each include an adaptive array including a plurality of antennas, and the base station optimally directs a transmission signal. And a weight control means for giving a weight to each antenna based on the determined transmission directivity, and the mobile station optimally controls the directivity of the desired signal at the time of reception. A CDMA wireless transmission system including weight control means for giving a predetermined weight to each antenna in order to achieve the above. 9. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station each include an adaptive array including a plurality of antennas, and the base station optimally directs a transmission signal. And a weight control means for giving a weight to each antenna based on the determined transmission directivity, and the mobile station optimizes the directivity of the desired signal at the time of reception. In addition to giving a predetermined weight to each antenna for control, at the time of transmission, a weight control means is provided to optimally control the directivity of the transmission signal by giving the weight used at reception to each antenna. CDMA wireless transmission system. 10. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station are equipped with an adaptive array composed of a plurality of antennas, and the base station directs a desired signal at the time of reception. To determine the optimum directivity of the transmission signal, the mobile station is provided with a weight control means for giving a predetermined weight to each antenna in order to optimally control the directivity. A CDMA wireless transmission system comprising weight control means for weighting each antenna based on transmission directivity. 11. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station are equipped with an adaptive array composed of a plurality of antennas, and the base station directs a desired signal at the time of reception. A weight control means for giving a predetermined weight to each antenna to optimally control the directivity is provided, and the mobile station, when receiving, has a predetermined weight for optimally controlling the directivity of the desired signal. Is given to each antenna,
A CDMA wireless transmission system including weight control means for optimally controlling directivity of a transmission signal by giving a weight used for reception to each antenna during transmission. 12. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station are equipped with an adaptive array composed of a plurality of antennas, and the base station transmits a desired signal at the time of reception. A weight is given to each antenna in order to control the directivity optimally, and at the time of transmission, the weight used for reception is given to each antenna to optimally control the directivity of the transmission signal. The mobile station is provided with a control means, and a transmission directivity determining means for determining an optimum directivity of the transmission signal, and a weight control means for assigning a weight to each antenna based on the determined transmission directivity. CDMA
Wireless transmission system. 13. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station are equipped with an adaptive array composed of a plurality of antennas, and the base station transmits a desired signal at the time of reception. A weight is given to each antenna in order to control the directivity optimally, and at the time of transmission, the weight used for reception is given to each antenna to optimally control the directivity of the transmission signal. A CDMA radio transmission system comprising a control means, and a mobile station comprising a weight control means for giving a predetermined weight to each antenna in order to optimally control the directivity of a desired signal at the time of reception. 14. In a transmission system for performing wireless communication using direct sequence CDMA, a base station and a mobile station optimize an directivity of a desired signal at the time of reception and an adaptive array composed of a plurality of antennas. In addition to giving a predetermined weight to each antenna for control, at the time of transmission, a weight control means is provided to optimally control the directivity of the transmission signal by giving the weight used at reception to each antenna. CDMA wireless transmission system. 15. The transmission directivity determining unit in the base station,
8. A means for determining the directivity of a transmission signal from the position data of the mobile station transmitted from the mobile station, the base station position data stored in advance, and the propagation path characteristic data of the surroundings. 8. The CDMA wireless transmission system according to any one of 8 and 9. 16. The transmission directivity determining unit in the mobile station,
6. A means for determining directivity of a transmission signal from its own position data obtained from a global positioning system receiver, base station position data stored in advance and surrounding propagation path characteristic data, 13. The CDMA wireless transmission system according to any one of 7, 10, and 12. 17. The transmission directivity determining unit in the mobile station,
6. A means for determining directivity of a transmission signal from its own position data obtained from a global positioning system receiver, position data sent from a mobile station of a communication partner, and propagation path characteristic data in the surroundings. 7, 10, 12
The CDMA wireless transmission system according to any one of 1. 18. The CDMA radio transmission apparatus according to claim 1, further comprising a transmission power control means. 19. The CDMA radio transmission system according to claim 3, wherein the base station and / or the mobile station comprises transmission power control means.