JP2001016184A - Received data repeating circuit for cdma base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a received data repeating circuit for CDMA base station by which the number of wirings between a receiving part and a baseband processing part in the case of repeating baseband received data from the radio receiving part to the baseband processing part can be reduced in the base station of a mobile communication network in a CDMA system. SOLUTION: In radio receiving parts 10a-10d of this received data repeating circuit, signals received by respective antennas are demodulated/frequency converted by demodulating parts 11a-11d, A/D converted by A/D converting parts 12a-12d, outputted as baseband received data and inputted to an output data converting part 21, any arbitrary received data are selected, multiplexed in time dividing manner and inputted to an input data converting part 31 later, multiplexed received data are demultiplexed and the demultiplexed baseband received data are inputted to an inverse spread processing part 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CDMA (Code Diode).
In a base station of a mobile communication network based on the vision multiple access (vision) method, a receiving unit and a baseband for relaying baseband reception data demodulated and converted by a radio reception unit for each antenna to a baseband processing unit. The present invention relates to a CDMA base station reception data relay circuit in which the number of wires between processing units is reduced.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram showing an example of relaying received data to a baseband processing unit used in a conventional CDMA receiving apparatus.

In a CDMA receiving apparatus, the data received by each of the radio receiving units 10a to 10d is converted into a baseband signal by a baseband processing unit 7.
In the method of relaying to 0, it is necessary to perform despreading processing using reception baseband reception data of a plurality of carriers and a plurality of sectors. It becomes necessary, and this is selected and used in the despreading processing unit.

In this conventional example, the number of receiving units connected to the bit width of data is determined when relaying baseband reception data that has been converted to baseband reception data and A / D-converted by the radio reception units 10a to 10d. The number of multiplied wirings is input to the despreading processing unit 71.

[0005]

However, when the above-mentioned relay of received data is performed, the number of wirings must be equal to the total bit width of the received data from each of the receiving units. There is a problem that the number of wirings is required. In particular, in the case of a device configuration requiring a plurality of wireless receiving units, the increase in the number of wirings becomes remarkable.

The present invention has been made to solve the above problems,
In a base station of a CDMA mobile communication network, the number of wires between a receiving unit and a baseband processing unit is reduced when relaying received data converted to baseband receiving data by a wireless receiving unit to a baseband processing unit. It is an object of the present invention to provide a CDMA base station reception data relay circuit.

[0007]

In order to solve the above-mentioned problems, the present invention provides a base station having a plurality of antennas in a CDMA mobile communication network, which demodulates a signal received by each antenna. A plurality of radio reception units that perform A / D conversion to obtain baseband reception data corresponding to each antenna, and select required baseband reception data corresponding to the antenna from the baseband reception data output from these radio reception units. A time division multiplexed output data conversion unit, and a data separation / processing unit that separates the time division multiplexed output data and performs despreading processing.

With the above configuration, there is no need to connect the baseband reception data from all the radio reception units to the baseband processing unit that performs despreading processing.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration example of a CDMA base station reception data relay circuit of the present invention. The CDMA base station according to the present embodiment divides a zone covered by one base station into a plurality of sectors in a CDMA mobile communication network, and includes a plurality of antennas having directivity corresponding to each sector. Then, as the mobile station moves, the electric field strength of the radio signal received by each antenna is measured, and the signal received by the antenna having the strong electric field strength is used.

Each of the radio receiving units 10a to 10d includes an antenna, a demodulation unit, and an A / D conversion unit. A signal received by each antenna is demodulated and frequency-converted by the demodulation units 11a to 11d. A / D at converters 12a to 12d
It is converted and output as baseband reception data.

The output baseband reception data is input to an output data converter 21. The control unit 22 is connected to the output data conversion unit 21 and selects time-division-multiplexed reception data from n reception data input to the output data conversion unit 21 and outputs the selected data. Control. The output data converter 21 and the controller 22 constitute a data multiplex converter 20.

The input data conversion section 31 separates the input multiplexed reception data and inputs the demultiplexed baseband reception data to the despreading processing section 32. Despread processing unit 32
Performs despreading of the input data. The input data conversion unit 31 and the despreading processing unit 32 use the data separation / processing unit 3
0.

Next, the detailed configurations of the output data converter 21 and the input data converter 31 will be described. These input / output units can be realized by, for example, a selector, a multiplexer, and a demultiplexer.

FIG. 2 is a block diagram showing a configuration example of the output data converter 21 and the input data converter 31 in the present embodiment. The output data converter 21 includes a selector 23 and a multiplexer 24. The selector unit 23 receives the A / D-converted received data 100a to 100d from each receiving unit, selects baseband received data according to an instruction from the control unit 22, and outputs the selected data to the multiplexer 24. The multiplexer 24 performs time-division multiplexing of the baseband received data.

The control unit 22 controls the selector unit 2 according to the electric field strength of the radio signal received by each antenna of the radio reception unit.
3 is output a selection instruction. As a result, it is possible to use a signal received by an antenna having a strong electric field strength as the mobile station moves.

The input data converter 31 comprises a demultiplexer 33. The demultiplexer 33 performs a process of separating the baseband received data that has been time-division multiplexed. The separated baseband reception data 101a to 101c are input to the despreading processing unit 32.

As described above, the output data converter 2
1 selects the required number from the baseband reception data corresponding to each input antenna according to the instruction of the control unit 22, and then time-division multiplexes and outputs. The output baseband reception data is input to the input data conversion unit 31, which separates the time-division multiplexed data into baseband reception data corresponding to each antenna, and then inputs the baseband reception data to the despreading processing unit 13.

In this way, by selecting and multiplexing the baseband reception data of each antenna and relaying the data to the baseband processing unit, the effect of reducing the number of wires between the radio reception unit and the baseband processing unit can be obtained. .

Referring to FIG. 3, the receiving unit has 6 antennas, the bit width of the A / D converter is 8 bits, the number of selections of received data is 3 antennas, and the data width in time division multiplexing is 8 bits. An example will be described below.

The received data received by the receiving units of the six antennas is orthogonally demodulated by each demodulation processing unit, frequency-converted, and converted into 8-bit baseband reception data by each A / D conversion unit. The data is input to the output data converter 21.
The input baseband reception data is input to the selector unit in the output data conversion unit 21, and the control unit 22 selects reception data of any three antennas.

FIG. 4 shows received data of three selected antennas. As shown in (a), the received data A to C of the clock cycle T selected by the selector unit 22 is three times the clock frequency (clock cycle T) of the received data A to C by the multiplexer 24 as shown in (b). / 3) is time-division multiplexed and converted into multiplexed data having an 8-bit width. The multiplexed data is input to the demultiplexer 33 in the input data conversion unit 31, where the multiplexed data is separated, converted into the original 3-antenna 8-bit data, and input to the despreading processing unit 32.

Next, another embodiment of the present invention will be described with reference to FIG.

In this embodiment, each of the radio receiving units 40a to 40a
A baseband parallel-serial conversion unit (PS conversion unit 4) for performing parallel-serial conversion of baseband parallel data between the A / D conversion unit of 0d and the output data conversion unit 21.
1a to d) are connected to be output from each of the wireless receiving units 40a to 40d, and the converted baseband serial data is converted from serial to parallel into baseband serial-parallel converters (SP converters 51a to 51d). Are connected and input to the data multiplexing conversion unit 50.

Further, a multiplexed parallel-serial converter (P-serial converter) for parallel-serial conversion of the multiplexed parallel data between the output data converter 21 and the input data converter 31.
An S-converter 52) is connected to the output of the data multiplex converter 50, and a multiplex serial-parallel converter (SP converter 61) for serial-parallel conversion of the converted multiplexed serial data is connected. Data separation and processing unit 6
It is configured to input 0.

By performing parallel-serial and serial-parallel conversion by data relay between the respective circuits, between the wireless reception units 40a to 40d and the output data conversion unit 21 and between the output data conversion unit 21 and the input conversion unit 31 Further, the number of wirings can be reduced. Further, by reducing the number of wires, transmission using differential transmission and transmission using a coaxial cable become easy, and a device that is resistant to noise and capable of high-speed transmission can be provided.

[0027]

As described above, according to the present invention, only the reception data corresponding to the required antenna is selected by the selector from the baseband reception data from the radio reception unit by the selection instruction of the control unit, and the multiplexer is used. In addition, by providing the functions of time division multiplexing and demultiplexing by the demultiplexer, it is not necessary to connect the baseband reception data from all the radio reception units to the baseband processing unit, so that the number of wirings can be reduced. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a CDMA base station reception data relay circuit of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of an output data conversion unit and an input data conversion unit;

FIG. 3 is a configuration diagram when the number of wireless receiving units is 6 in the present invention.

FIG. 4 is an explanatory diagram of time division multiplexing of received data,
FIG. 3A is a diagram illustrating selected reception data, and FIG. 3B is a diagram illustrating time-division multiplexed data.

FIG. 5 is a diagram illustrating a configuration example using parallel-serial conversion and serial-parallel conversion.

FIG. 6 is a block diagram showing an example of relaying received data to a baseband processing unit in a conventional CDMA receiving apparatus.

[Explanation of symbols]

 10a to 10d Radio reception units 11a to 11d Demodulation units 12a to 12d A / D conversion units 20 Data multiplex conversion units 21 Output data conversion units 22 Control units 30 Data separation / processing units 31 Input data conversion units 32 Despread processing units

Claims (6)

[Claims] A base station having a plurality of antennas in a CDMA mobile communication network demodulates and A / D-converts a signal received by each antenna.
A plurality of radio reception units for obtaining baseband reception data corresponding to each antenna, and a baseband reception data corresponding to a required antenna is selected from the baseband reception data output from these radio reception units, and time-division multiplexing is performed. A reception data relay circuit for a CDMA base station, comprising: a data multiplexing conversion unit for output data; and a data separation / processing unit for separating the time-division multiplexed output data and performing despreading processing. 2. The data multiplexing / conversion unit selects a baseband reception data from the plurality of radio reception units, a multiplexer for time-division multiplexing the baseband reception data selected by the selector, A control unit that determines which antenna corresponding baseband reception data to use from among the baseband reception data from the wireless reception unit and outputs a selection instruction to the selector, wherein the data separation / processing unit 2. The reception data relay circuit for a CDMA base station according to claim 1, further comprising a demultiplexer for separating the time-division multiplexed baseband reception data into the original baseband reception data. 3. The CDM according to claim 2, wherein the control section outputs a selection instruction to the selector according to the electric field strength of the radio signal received by each of the antennas.
A received data relay circuit of the A base station. 4. When the control unit instructs to select n baseband reception data, the multiplexer outputs a time-division multiplexed signal at a clock frequency n times the clock of the input signal. 4. The received data relay circuit of a CDMA base station according to claim 2 or claim 3. 5. The radio receiving unit has a baseband parallel-serial converter for converting baseband parallel data after A / D conversion into baseband serial data and outputting the data, and the data multiplexing converter includes: The C according to any one of claims 1 to 4, further comprising a baseband serial-parallel converter for converting the input baseband serial data into baseband parallel data.
Received data relay circuit of DMA base station. 6. The data multiplexing conversion section has a multiplexed parallel-serial conversion section for converting multiplexed parallel data into multiplexed serial data and outputting the multiplexed serial data, and wherein the data separation / processing section has 6. The received data relay circuit of a CDMA base station according to claim 1, further comprising a multiplexed serial-parallel converter for converting the multiplexed serial data into multiplexed parallel data.