KR100275476B1 - Wireless tranceiver for transmission diversity using maximum likelihood ratio combinning - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a wireless transceiver for transmit diversity.

2. The technical problem to be solved by the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless transmission / reception apparatus for transmission diversity capable of obtaining an optimal transmission gain on a path where a signal is transmitted from a base station by controlling the gain of a signal transmitted from each base station through each transmission path. .

3. Summary of Solution to Invention

The present invention provides gain control means for receiving gain control information and providing a gain control value; First transmission processing means for transmitting the gain of the transmission signals by adjusting the gain control value; First and second phase estimation means for estimating a changed phase of a signal received from the first transmission processing means; Gain control information generating means for comparing the phase values estimated by the first and second phase estimating means and providing the gain control information; And second transmission processing means for carrying the gain control information on the transmission signal and transmitting the result.

4. Important uses of the invention

The present invention is used in a wireless transmission / reception apparatus using a DS / CDMA scheme for transmit diversity.

Description

Wireless Transceiver for Transmit Diversity Using Maximum Combined Ratio

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless transceiver using Code Division Multiple Access (CDMA) scheme, and more particularly to a wireless transceiver using DS (Direct Spread) / CDMA scheme for transmit diversity. The present invention relates to a wireless transmission / reception apparatus using a maximum coupling ratio that can adjust a gain of a signal transmitted from a base station to a mobile station through each transmission path.

FIG. 1 is a block diagram illustrating a wireless transmission and reception apparatus using a general DS / CDMA scheme, and is divided into a transmitting end of a base station and a receiving end of a mobile station.

The transmitting end of the base station is composed of a plurality of multipliers (110, 111 to 11n, 121 to 12 (n + 1)), and an adder (130).

In addition, the receiving end of the mobile station includes a phase estimator 140 and a data demodulator 150.

Referring to the operation of the wireless transceiver using the general DS / CDMA scheme having the above structure as follows.

First, the transmission process of the transmitting end of the base station will be described.

The multiplier 110 multiplies the input pilot signal by a Walsh code 0 representing an orthogonal code and outputs the result to the multiplier 121. Here, the pilot signal is used to compensate for the channel change generated on the transmission path of data.

Multipliers 111 through 11n multiply input data 1 through n and Walsh codes 1 through n and output the multipliers 122 through 12 (n + 1). Subsequently, the multiplier 121 multiplies the pseudo noise signal representing the input spreading signal with the output signal of the multiplier 110 to output to the adder 130, wherein the multipliers 122 to 12n are also input to the input pseudo noise signal. The output signals of the multipliers 111 to 11n are multiplied and output to the adder 130. Here, the Walsh code distinguishes signals for transmission, and the pseudo noise signal spreads the pilot signal and the data 1 to n.

When signals are transmitted through the multiplication process, the adder 130 adds the output signals of the multipliers 121 to 12 (n + 1) and transmits them to the receiving end of the mobile station.

Next, a description will be given of the process of the base station receives the signals transmitted from the base station as described above.

The phase estimator 140 receives the Walsh code 0 and the pseudo noise signal, estimates the phase of the channel changed in the process transmitted from the base station, and outputs the phase estimation value of each changed channel to the data demodulator 150.

Subsequently, the data demodulator 150 receives the Walsh code k and the pseudo noise signal, and demodulates the data of each channel transmitted from the base station to the original data in accordance with the phase estimation value of each changed channel by the phase estimator 140. do.

FIG. 2 is a block diagram illustrating a conventional CDMA wireless transceiver for TSTD, and is generally divided into a transmitting end of a base station and a receiving end of a mobile station.

The transmitting end of the base station consists of two pilot channels and a plurality of data transmission channels. Here, the pilot signals of the two channels are distinguished by different orthogonal codes (Walsh codes) and have independent transmission paths by being transmitted through different antennas. In addition, the plurality of data transmission channels transmit diversity through different antennas by periodically switching switches.

The transmitter of the base station includes multipliers 210, 211, 212 to 21 (n + 1), 220, 221, 222 to 22 (n + 1), switches 231 to 23n, and adders 241, 242).

The receiving end of the mobile station consists of phase estimators 251 and 252, a switch 253 and a data demodulator 254.

The operation of the CDMA wireless transceiver for the conventional TSTD having the structure as described above is as follows.

First, the transmission process of the transmitting end of the base station will be described.

The multiplier 210 multiplies the input pilot signal 1 with the Walsh code 0 and outputs the multiplier 220 to the multiplier 220. The multiplier 211 also multiplies the input pilot signal 2 with the Walsh code 1 and outputs the multiplier 221. . In this case, the multipliers 212 to 21n multiply the input data 1 to n and the Walsh codes 2 to (n + 1) and output the multipliers 222 to 22 (n + 1).

Subsequently, the multiplier 220 multiplies the input pseudo noise signal by the output signal of the multiplier 210 and outputs the multiplier 241 to the adder 241. The multiplier 221 also outputs the input pseudo noise signal and the output signal of the multiplier 211. Is multiplied and output to the adder 242. In this case, the multipliers 222 to 22 (n + 1) multiply the input pseudo noise signal and the output signals of the multipliers 212 to 21 (n + 1) and output the multipliers 231 to 23n.

In this way, signals output from the multipliers 221 to 22 (n + 1) are transferred to the adders 241 and 242 through the switches 231 to 23n. Here, the switches 231 to 23n periodically change the switching direction to select a transmission path.

At this time, when the switches 231 to 23n are switched in the transmission path 1 direction and the output signals of the multipliers 222 to 22 (n + 1) are switched to the adder 241, the adder 241 is a multiplier 220, 222. After adding the output signals of < RTI ID = 0.0 > 22 < / RTI > (n + 1), the added signal of each channel is transmitted to the receiving end of the mobile station through transmission path 1. If the switches 231 to 23n are switched in the transmission path 2 direction, and the output signals of the multipliers 222 to 22 (n + 1) are switched to the adder 242, the adder 242 is a multiplier 220, 222. After adding the output signals of the channels 22 to (n + 1), the added signal of each channel is transmitted to the receiving end of the mobile station through the transmission path 2.

Next, a process of the base station receiving the signals transmitted from the base station as described above will be described.

The phase estimator 251 receives the Walsh code 0 and the pseudo noise signal, estimates the phase of the changed channel in the process of being transmitted through the transmission path 1 from the base station, and converts the phase estimation value of each changed channel to the switch 253. In addition, the phase estimator 252 also receives the Walsh code 1 and the pseudo noise signal, estimates the phase of the changed channel in the process of being transmitted through the transmission path 2 from the base station, and switches the phase estimation value of each changed channel. Output to (253). Here, the switch 253 is switched to the phase estimator 251 when the switches 231 to 23n of the base station are switched in the transmission path 1 direction to switch the output signal of the phase estimator 251 to the data demodulator 254. If the switches 253 to 23n of the base station are switched in the transmission path 2 direction, the switch 253 is switched to the phase estimator 252 to switch the output signal of the phase estimator 252 to the data demodulator 254.

Therefore, when the phase estimate estimated by the phase estimator 251 is transferred to the data demodulator 254 through the switch 253, the data demodulator 254 receives the Walsh code k and a pseudo noise signal, and receives a phase estimator ( 251) demodulates the data of each channel received through the transmission path 1 from the base station into the original data according to the phase estimation value of each changed channel. If the phase estimate estimated by the phase estimator 252 is transferred to the data demodulator 254 through the switch 253, the data demodulator 254 receives the Walsh code k and a pseudo noise signal, and receives a phase estimator ( 252) demodulates the data of each channel received from the base station through transmission path 2 according to the phase estimation value of each changed channel into original data.

3 is a block diagram illustrating a CDMA wireless transceiver for a conventional STD, which is an improvement of the CDMA wireless transceiver for the TSTD shown in FIG.

As shown in FIG. 3, the conventional CDMA wireless transceiver includes multipliers 310, 311, 312 through 31 (n + 1), 320, 321, and 322 through 32 (n + 1). And switches 331 to 33n, adders 341 and 342, data demodulators 343 and 355, transmission path selector 344, phase estimators 351 and 352, transmission path A selection control section 353, a switch 354, a transmission path selection signal transmission section 356, and a data modulator 357 are provided.

The conventional CDMA wireless transceiver for the STD having the structure as described above is largely divided into a transmitting end and a receiving end of a base station, and a receiving end and a transmitting end of a mobile station. Is done.

The transmitter of the base station includes multipliers 310, 311, 312 to 31 (n + 1), 320, 321, 322 to 32 (n + 1), switches 331 to 33n, and adders 341, 342).

The receiving end of the base station includes a data demodulator 343 and a transmission path selector 344.

The receiving end of the mobile station is composed of phase estimators 351 and 352, a transmission path selection control unit 353, a switch 354, and a data demodulator 355.

The transmitting end of the mobile station is composed of a transmission path selection signal transmitter 356 and a data modulator 357.

Referring to the operation of the conventional CDMA wireless transceiver for the STD having the structure as described above is as follows.

First, the transmission and reception process of the base station will be described.

The operations of the multipliers 310, 311, 312 through 31 (n + 1), 320, 321, and 322 through 32 (n + 1) are the same as described with reference to FIG.

The switches 331 to 33n are controlled by the transmission path selector 344 to switch in the direction of the transmission path 1 or 2, that is, the transmission path selection unit 344 outputs a signal for selecting the transmission path 1 direction. Then, the switches 331 to 33n select the transmission path 1 direction by switching the output signal to the adder 341 to the multipliers 322 to 32 (n + 1). If the transmission path selector 344 outputs a signal for selecting the transmission path 2 direction, the switches 331 to 33n are multipliers 322 to 32 (n + 1) and the output signal is added to the adder 342. Switch to select transmission path 2 direction.

As such, when the output signals of the multipliers 322 to 32 (n + 1) are switched to the adder 341, the adder 341 adds the output signals of the multipliers 320 and 322 to 32 (n + 1). Then, the added signal of each channel is transmitted to the receiving end of the mobile station through the transmission path 1. If the output signals of the multipliers 322 to 32 (n + 1) are switched to the adder 342, the adder 342 adds the output signals of the multipliers 321 and 322 to 32 (n + 1). Then, the added signal of each channel is transmitted to the receiving end of the mobile station through the transmission path 2.

Next, a process of the base station receiving the signals transmitted from the base station as described above will be described.

Operation of the phase estimators 351 and 352 is the same as described above in FIG.

The transmission path selection control unit 353 compares the phase estimation values estimated by the phase estimators 351 and 252 to determine which of the transmission paths 1 and 2 is good, and then determines the transmission path determined to be good. The switching operation of the switch 354 is controlled while transmitting the transmission path selection signal for selection to the transmission path selection signal transmission unit 356.

That is, when it is determined that the transmission path 1 is good, the transmission path selection control unit 353 transfers a signal for selecting the transmission path 1 to the transmission path selection signal transmission unit 356, and transmits the switch 354 to the phase estimator 351. ). If it is determined that the transmission path 2 is good, the transmission path selection control unit 353 transfers a signal for selecting transmission path 2 to the transmission path selection signal transmission unit 356, and transmits the switch 354 to the phase estimator 352. ).

Subsequently, when the phase estimate estimated by the phase estimator 351 is transferred to the data demodulator 355 through the switch 354, the data demodulator 355 receives the Walsh code 2 and the pseudo noise signal, and receives a phase estimator ( In step 351, data of each channel received through the transmission path 1 from the base station is demodulated according to the phase estimation value of each changed channel into original data. If the phase estimate estimated by the phase estimator 352 is transferred to the data demodulator 355 through the switch 354, the data demodulator 355 receives the Walsh code 2 and the pseudo noise signal, and receives the phase estimator ( 352) demodulates the data of each channel received from the base station via transmission path 2 according to the phase estimation value of each changed channel into original data.

Next, a process of selecting a transmission path by receiving a signal transmitted from the transmitting end of the mobile station to the receiving end of the base station will be described.

The transmission path selection signal transmission unit 356 carries a transmission path selection signal on a data string to be transmitted from the mobile station to the base station, and the transmission path selection signal is transmitted from the transmission path selection control unit 354. The data string transmitted to the base station is loaded at regular intervals. For example, assuming that a transmission path selection signal transmitted from the transmission path selection control unit 354 is loaded at intervals of 10 data in a transmission data string consisting of 50 data, this means that the transmission path selection signal is the data. The original data located at the 10th, 20th, 30th, 40th, and 50th positions in the column is loaded at the removed position and transmitted to the base station. Here, the transmission path selection signal has a binary value of '0' or '1'.

As such, when the transmission path selection signal transmission unit 356 loads the transmission path selection signal transmitted from the transmission path selection control unit 353 to the data sequence to be transmitted to the base station and transmits the transmission path selection signal to the data modulator 357, the data modulator. In operation 357, the data string transmitted from the transmission path selection signal transmitter 356 is modulated and transmitted to the receiving end of the base station.

Subsequently, the data demodulator 343 of the base station demodulates the signal transmitted from the transmitting end of the mobile station and transmits it to the transmission path selector 344.

In this way, when the data string transmitted from the mobile station is received, the transmission path selector 344 extracts the transmission path selection signal carried in the data string at regular intervals, and then the transmission path in the direction indicated by the extracted transmission path selection signal. The switching operation of the switches 331 to 33n is controlled so that transmission data of the base station is transmitted to the mobile station.

However, in the conventional radio transceiver as described above, since the data is transmitted from the base station to the mobile station by selecting an excellent transmission path, it is possible to improve the performance. Since the transmission path selection signal should be inserted into the data string transmitted by the mobile station, the performance of the prediction of the phase change appearing on the transmission path from the mobile station to the base station is degraded or the information transmission efficiency is inferior. For this reason, there is a limitation in speeding up the path selection to 1.6Kbps, 3.2Kbps or more, which is inconvenient to use at high speeds, and the mobile station measures the reception quality of the corresponding data channel transmitted by the base station according to the measurement result. In the case of adjusting the transmission power of the base station, there is a problem that can contradict each other and significantly reduce the performance.

Accordingly, the present invention has been made to solve the above problems, and in implementing a wireless transmission / reception apparatus using a DS / CDMA scheme for transmission diversity, the base station is transmitted from the base station to the mobile station through each transmission path. By using the phase estimates that estimate the changed phase of the signal, the gain of the signal transmitted through each transmission path from the base station is controlled so that it is less susceptible to errors in transmitting transmission path selection information from the mobile station and the signal from the base station. It is an object of the present invention to provide a wireless transceiver capable of obtaining an optimal transmission gain on a transmitted path.

1 is a block diagram of a wireless transmission and reception apparatus using a general DS / CDMA scheme.

2 is a block diagram of a conventional CDMA wireless transceiver for TSTD.

Figure 3 is a block diagram of a conventional CDMA wireless transceiver for STD.

Figure 4 is a block diagram of an embodiment of a radio transceiver for transmit diversity according to the present invention.

Explanation of symbols on the main parts of the drawings

410-413, 421-42n, 431-43n, 441-44n, 451-45n, 461-46n: Multiplier

414, 475, 476: demodulator

415: reception processing unit

416: gain control unit

473, 474: first and second phase estimators

477: Combiner

478: gain control information generator

479: transmission processing unit

480: modulator

In order to achieve the above object, the present invention provides a radio transceiver for diversity for transmitting and receiving data between a base station and a mobile station, which separately outputs transmission information and gain control information from a signal received from the mobile station. Receiving processing means; Gain control means for receiving gain control information from the reception processing means and providing a gain control value for controlling a gain of a signal to be transmitted to the mobile station; First transmission processing means for adjusting the gain of signals to be transmitted to the mobile station through different transmission paths by using the gain control value; First and second phase estimating means for estimating the changed phase of the signal received from the first transmission processing means through different transmission paths; First demodulation means for demodulating a transmission signal of the first transmission processing means received through the same path as the signal transmitted to the first phase estimation means using the phase value estimated by the first phase estimation means ; Second demodulation means for demodulating a transmission signal of the second transmission processing means received through the same path as the signal transmitted to the second phase estimation means, using the phase value estimated by the second phase estimation means. ; Coupling means for combining and outputting the output signals of the first and second demodulation means; Gain control information generating means for comparing the phase values estimated by the first and second phase estimation means and providing the gain control information according to the comparison result; And second transmission processing means for carrying the transmission of the gain control information transmitted from said gain control information generating means to a transmission signal for transmission to said base station.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIG. 4.

4 is a block diagram of an embodiment of a radio transceiver for transmit diversity according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIG. 4.

4 is a block diagram of an embodiment of a radio transceiver for transmit diversity according to the present invention.

As shown in FIG. 4, the wireless transceiver for transmit diversity according to the present invention includes a multiplier 410 for multiplying an input pilot signal 1 and a Walsh code 0, an input pilot signal 2, and a Walsh code 1. A multiplier 411 for multiplying the multiplier, multipliers 412 and 413 for multiplying output signals of the multipliers 410 and 411 and a pseudo noise signal, and a demodulator 414 for demodulating a signal received from a mobile station. And a reception processing unit 415 for separating and outputting the received information and the gain control information received from the mobile station from the output signal of the demodulator 414, and receiving the gain control information transmitted from the reception processing unit 415. A gain control unit 416 for outputting a gain control value for controlling the gain of transmission path 2, multipliers 421 to 42n for sequentially multiplying the input data 1 to n with a pseudo noise signal, Walsh code entered (2 2n) and multipliers 431 to 43n for sequentially multiplying the gain control values transmitted from the gain control unit 416, output signals of the multipliers 421 to 42n, and output signals of the multipliers 431 to 43n. Multipliers 441 to 44n for sequentially multiplying, Multipliers 451 to 45n for sequentially multiplying the input Walsh codes 3 to 2n + 1 and the gain control value transferred from the gain control unit 416. Multipliers 461 to 46n for sequentially multiplying the output signals of the multipliers 421 to 42n and the output signals of the multipliers 451 to 45n, and the output signal and multipliers 441 to 44n of the multiplier 412; First adder 471 for adding the output signal of the multiplier, a second adder 472 for adding the output signal of the multiplier 413 and the output signal of the multipliers 461 to 46n, and Walsh code 0 and pseudo noise. Receives a signal from the base station through the transmission path 1 A second phase estimator 473 for estimating the changed phase of the transmitted signal, a Walsh code 1 and a pseudo noise signal, and a second phase for estimating the changed phase of the signal transmitted through the transmission path 2 from the base station; A demodulator 475 for receiving a phase estimator 474, an output signal of the first phase estimator 473, and a demodulator 475 for demodulating a signal received through the transmission path 1 from the base station; and the second phase estimator 473. A demodulator 476 for demodulating the signal received through the transmission path 2 from the base station and a combiner 477 for combining and demodulating the signals demodulated by the demodulators 475 and 476; A gain control information generator 478 for comparing the output signals of the first and second phase estimators 473 and 474 and providing gain control information for adjusting the gain of the signal in the base station according to the comparison result; , base A transmission processor 479 for carrying the gain control information provided from the gain control information generator 478 to the signal for transmission to the station, and a modulator 480 for modulating the signal transmitted from the transmission processor 479. do.

As described above, a radio transceiver for transmit diversity according to the present invention is divided into a transmitter and a receiver of a base station, and a receiver and a transmitter of a mobile station. The base station and the mobile station having the above structure include the following functional elements. Is made of.

The transmitter of the base station includes multipliers 410 to 413, 421 to 42n, 431 to 43n, 441 to 44n, 451 to 45n, 461 to 46n, a gain control unit 416, and a first adder 471 and 472. It consists of

The receiving end of the base station is composed of a demodulator 414 and a receiving processor 415.

The receiving end of the mobile station comprises first and second phase estimators 473 and 474, demodulators 475 and 476, combiner 477 and gain control information generator 478.

The transmitting end of the mobile station is composed of a transmission processing unit 479 and a modulator 480.

The operation of the radio transceiver for transmit diversity according to the present invention having the structure as described above is as follows.

First, the transmission process of the base station will be described.

The multiplier 410 multiplies the input pilot signal 1 with the Walsh code 0 and outputs it to the multiplier 412. The multiplier 412 multiplies the input pilot signal 2 with the Walsh code 1 and outputs it to the multiplier 411. The multipliers 421 to 42n also multiply the input data 1 to n with the pseudo noise signal to output to the multipliers 441 to 44n, and the multipliers 421 to 42n respectively multiply the multiplier by the multiplier 461. To 46n).

The gain control unit 416 then outputs, to the multipliers 431 to 43n, a gain control value for adjusting the gain of the signal to be transmitted to the mobile station via the transmission path 1 according to the gain control information transmitted from the reception processing unit 415. In addition, a gain control value for adjusting the gain of the signal to be transmitted to the mobile station through the transmission path 2 is output to the multipliers 451 to 45n. At this time, the reception processing unit 415 converts the gain control information from the transmission signal of the mobile station demodulated by the demodulator 414, and transfers the extracted gain control information to the gain control unit 416.

As such, when gain control information for adjusting the gain of the signal to be transmitted through the transmission path 1 and the transmission path 2 is transmitted, the multipliers 431 to 43n are input Walsh codes 2 to 2n and a gain control unit 416, respectively. Multiplying the gain control value transmitted from the multiplier and outputting it to the multipliers 441 to 44n, and the multipliers 451 to 45n are transferred from the input Walsh codes 3 to 2n + 1 and the gain control unit 416, respectively. The gain control value is multiplied and output to the multipliers 461 to 46n. Here, the gain control unit 416 adjusts the gain of each transmission path through the transmission path 1 according to the state of each transmission path, and the gain adjustment value is transmitted to the mobile station.

For example, when the gain control unit 416 provides the gain control values for the multipliers 431 to 43n to increase the gain of the signal to be transmitted through the transmission path 1, the gain control unit 416 transmits the transmission path 2. The multipliers 451 to 45n provide a gain control value for reducing a gain of a signal to be transmitted. Of course, in order to maintain the same gain of the signal to be transmitted through the transmission path 1 and the transmission path 2, the gain control unit 416 outputs the same gain control value to the multipliers 431 to 43n and 451 to 45n.

Subsequently, the multipliers 441 to 44n multiply the output signals of the multipliers 421 to 42n and the output signals of the multipliers 431 to 43n, respectively, and output the multipliers 441 to 44n to the first adder 471. The multipliers 461 to 46n multiply the output signals of the multipliers 421 to 42n and the output signals of the multipliers 451 to 45n, respectively, and output the multipliers 461 to 46n to the second adder 472.

When the gain of the signal for transmitting to the mobile station is adjusted through the above process, the first adder 471 adds the output signal of the multiplier 412 and the output signal of the multipliers 441 to 44n, and outputs the second signal. The adder 472 adds and outputs an output signal of the multiplier 413 and an output signal of the multipliers 461 to 46n. At this time, the output signal of the first adder 471 is transmitted to the mobile station through the transmission path 1, while the output signal of the second adder 472 is transmitted to the mobile station through the transmission path 2.

Next, a process of the mobile station receiving the signals transmitted from the base station as described above will be described.

The first phase estimator 473 receives the Walsh code 0 and the pseudo noise signal, estimates the changed phase of the signal received from the base station through the transmission path 1, and outputs the changed phase to the demodulator 475 and the gain control information generator 478. . In addition, the second phase estimator 474 receives the Walsh code 1 and the pseudo noise signal and estimates the changed phase of the signal received from the base station through the transmission path 2 to the demodulator 476 and the gain control information generator 478. Output

Next, the demodulator 475 demodulates the transmission data of the signal transmitted from the base station through the transmission path 1 by using the Walsh code 2 and the pseudo noise signal and the phase estimation value estimated by the first phase estimator 473. Output to (477). In addition, the demodulator 476 demodulates the transmission data of the signal transmitted from the base station through the transmission path 2 by using the Walsh code 3 and the pseudo noise signal and the phase estimation value estimated by the second phase estimator 474. Output to (477).

In this way, since the data demodulated by the demodulators 475 and 476 have a slight time difference between them, the demodulated data are combined and output through the combiner 477.

At this time, the gain control information generator 478 compares the magnitudes of the output signals of the first and second phase estimators 473 and 474 to determine the transmission states of the transmission path 1 and the transmission path 2, that is, the gain control. When the information generator 478 determines that the phase estimate of the first phase estimator 473 is greater than the estimate of the second phase estimator 474, the information generator 478 reduces the gain of the signal to be transmitted through the transmission path 1 and transmits the transmission path 2 through the transmission path 2. The gain control information for transmitting the gain of the signal to be transmitted is transmitted to the transmission processor 479. If the gain control information generator 478 determines that the phase estimate of the first phase estimator 473 is smaller than the estimate of the second phase estimator 474, the gain control information generator 478 increases the gain of the signal to be transmitted through the transmission path 1. The gain control information for transmitting the gain of the signal to be transmitted through the path 2 is transmitted to the transmission processor 479.

When gain control information for controlling the gain of the transmission signal of the base station is transmitted through the above process, the transmission processor 479 carries the gain control information transmitted from the gain control information 478 in the transmission signal for transmission to the base station. Then, the gain control information is carried on the data string transmitted to the base station at regular intervals. For example, assuming that the power control signal is loaded at intervals of 10 data in a transmission data string consisting of 50 data, this means that the power control signal is 10th, 20th, 30th, 40th, and 50th in the data string. The original data, which was located first, is loaded at the removed position and transmitted to the base station. Here, the gain control information has a binary value of '0' or '1'.

In this way, the data sequence transmitted from the signal transmitter 479 is modulated by the modulator 480 and transmitted to the base station.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention compares each changed phase estimate of signals transmitted from the base station to the mobile station through different transmission paths, and uses the comparison result to obtain the gain of the signal transmitted from the base station through each transmission path. By adjusting, it is possible to obtain an optimal transmission gain on the transmission path through which data is transmitted from the base station while being less affected by an error appearing in the transmission path selection information transmission from the mobile station, thereby achieving an optimum transmission quality.

Claims (5)

In the radio transceiver for diversity for transmitting and receiving data between the base station and the mobile station, Reception processing means for separating transmission information and gain control information from a signal received from said mobile station and outputting them; Gain control means for receiving gain control information from the reception processing means and providing a gain control value for controlling a gain of a signal to be transmitted to the mobile station; First transmission processing means for adjusting the gain of signals to be transmitted to the mobile station through different transmission paths by using the gain control value; First and second phase estimating means for estimating the changed phase of the signal received from the first transmission processing means through different transmission paths; First demodulation means for demodulating a transmission signal of the first transmission processing means received through the same path as the signal transmitted to the first phase estimation means using the phase value estimated by the first phase estimation means ; Second demodulation means for demodulating a transmission signal of the second transmission processing means received through the same path as the signal transmitted to the second phase estimation means, using the phase value estimated by the second phase estimation means. ; Coupling means for combining and outputting the output signals of the first and second demodulation means; Gain control information generating means for comparing the phase values estimated by the first and second phase estimation means and providing the gain control information according to the comparison result; And Second transmission processing means for carrying the transmission of the gain control information transmitted from said gain control information generating means to a transmission signal for transmission to said base station; Wireless transmitting and receiving device for transmit diversity using the maximum combining ratio made. The method of claim 1, The first transmission processing means, First multiplication means for multiplying the input first pilot signal by the first Walsh code; Second multiplication means for multiplying the input second pilot signal with a second Walsh code; A plurality of third multiplication means for multiplying the plurality of input data and the plurality of third Walsh codes; A plurality of fourth multiplication means for multiplying the input plurality of Walsh codes with the gain control value; A plurality of fifth multiplication means for multiplying the input plurality of fifth Walsh codes with the gain control value; A plurality of sixth multiplication means for multiplying output signals of the plurality of third multiplication means and output signals of the plurality of fourth multiplication means; A plurality of seventh multiplication means for multiplying output signals of the plurality of third multiplication means and output signals of the plurality of fifth multiplication means; First adding means for adding an output signal of the first multiplication means and an output signal of the plurality of sixth multiplication means; And Second adding means for adding an output signal of the second multiplication means and an output signal of the seventh multiplication means; Wireless transmitting and receiving device for transmit diversity using the maximum combining ratio made. The method of claim 1, The reception processing means, Third demodulation means for demodulating a signal received from the second transmission processing means; And Receiving processing unit for separating the gain control information from the output signal of the second demodulation means and delivers it to the gain control means Wireless transmitting and receiving device for transmit diversity using the maximum combining ratio made. The method of claim 1, The second transmission processing means, A transmission processor for carrying the gain control information on a transmission signal for transmission to the base station; And Modulation means for modulating an output signal of the transmission processing section Wireless transmitting and receiving device for transmit diversity using the maximum combining ratio made. The method according to any one of claims 1 to 4, And the gain control information is a binary value of '0' or '1'.