JPH0795124A - Receiver for spread sectrum communication - Google Patents

Abstract

PURPOSE:To allocate a channel with excellent communication quality when the communication quality of a channel is deteriorated by utilizing a reception block not in use so as to search an idle channel whose communication quality is excellent. CONSTITUTION:A best channel setting section 9 of a channel management section CA outputs a channel designation signal to a reception block not busy in the case of start of new communication when the section 9 receives a best idle channel decision signal from a best idle channel quality deciding section 11 and the section 9 outputs the signal to reception blocks 1-n corresponding to a deteriorated channel decision signal when the section 9 receives the deteriorated channel decision signal. The best idle channel quality decision section 11 receives sequentially correlation values of all reception blocks 1-n not in bust state and a channel designation signal corresponding to the reception block and outputs the channel designation signal corresponding to the reception block peak level average level of the correlation values are minimum as a best idle channel decision signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is applicable to noise and CDMA (Co
de Division Multiple Access)
When the communication quality of a channel during communication deteriorates, or when a new channel is assigned, a vacant channel with good communication quality that was searched for in advance is assigned, and reception of spread spectrum communication base station that enables continuous good communication It is about machines.

[0002]

2. Description of the Related Art In recent years, the spread spectrum (SS) method is
Because of its random multiple connectivity, confidentiality, and interference resistance,
It has come to be used not only for military communication but also for public communication and personal communication. Among them, direct diffusion (DS)
The research and development of the synchronous system, which is the center of the system technology, has become active.

FIG. 4 is a block diagram showing the configuration of a receiver of a conventional spread spectrum communication base station.

In FIG. 4, reference numeral 1 denotes an antenna capable of receiving a transmission signal transmitted by a desired transmitter (desired station). Reference numeral 21 is a radio unit 1, 22 is a radio unit 2, ... 2n is a radio unit n. These receive frequency output signals 1 to n corresponding to the received signal output from the antenna 1 and the transmitted signal output from the desired station. It demodulates from the same carrier frequency to a baseband frequency and outputs received baseband signals 1 to n, respectively. Reference numeral 31 is a spread code generating unit 1, 32 is a spread code generating unit 2, ... 3n is a spread code generating unit n.
n is input and spread codes 1 to n are output. 41
4n is a despreading unit 2, 42 is a despreading unit, and 4n is a despreading unit n. Corresponding received baseband signals 1 to n are input and despread with spreading codes 1 to n, respectively. 51 is a data reproducing unit 1, 52 is a data reproducing unit 2, ... 5n is a data reproducing unit n, and the correlation value 1 of the corresponding despreading unit output is 1
~ N is input and data is reproduced. Here, as shown in FIG. 4, a block including a radio section, a spreading code generating section, a despreading section, and a data reproducing section is called a receiving block.
Reference numeral 6 denotes a line interface unit, to which the reproduced data 1 to n output from the respective data reproducing units 1 to n are input and output to the line as line data 1 to n. Channel 8 is a channel that is not currently used because the channel specification signal has been input
This is a free channel search unit that searches for (free channel) and outputs a free channel designation signal. 10 is a channel specification signal corresponding to a reception block whose correlation value is less than a specified value, to which a correlation value of a plurality of reception block outputs used for communication and a channel specification signal corresponding to the reception block are input. It is a channel quality determination unit that outputs as a channel determination signal. Reference numeral 12 denotes a channel setting unit to which an empty channel designating signal is input and which outputs the empty channel designating signal to the receiving block as a channel designating signal.

The operation of the receiver of the spread spectrum communication base station configured as described above will be described below. Of the n receiving blocks, receiving blocks 1 to 1
It is assumed that each n-1 is receiving a transmission signal from a particular desired station. In addition, the channel setting unit 12 uses the wireless units 1 to n-1 in the receiving blocks 1 to n-1 as channel designating signals at the start of communication of the respective receiving blocks.
And the spread code generators 1 to n-1 to the frequency setting signals 1 to n.
-1 and spread code setting signals 1 to n-1 are output.

Since the receiving blocks 1 to n-1 perform the same operation, the receiving block 1 will be described in particular. The antenna 1 receives the transmission signal transmitted by the desired station and outputs the reception signal. The radio unit 1 (21) can receive the carrier frequency of the desired station by the frequency setting signal 1, demodulates the received signal from the carrier frequency to the baseband frequency, and outputs the received baseband signal 1. The spread code generator 1 (31) can generate the same spread code 1 as the spread code of the desired station by the spread code setting signal 1. The despreading unit 1 (41) receives the reception baseband signal 1 output from the wireless unit 1 (21), and the spreading code generating unit 1
(31) Despread with the output spreading code 1 and output the correlation value 1. The data reproducing unit 1 (51) receives the correlation value 1 and outputs reproduced data 1. Reproduction data 1 to n-1 are input to the line interface unit 6, which is connected to the line by the line connection data in the reproduction data and is output as line data.

The empty channel search unit 8 receives the channel designation signals 1 to n-1 (frequency setting signals 1 to n-1 and spread code setting signals 1 to n-1), and sets the frequency setting signal and spread code setting. An empty channel is searched from all combinations of signals and an empty channel designation signal is output. The channel quality judgment unit 10 uses the channel designation signal 1
To n-1 are input, the correlation values 1 to n-1 of the output of the reception blocks 1 to n-1 are continuously input, and the peak value of the correlation value continues to be equal to or less than the prescribed value for the prescribed time,
Received block number (1 to n-1) that output the correlation value
And the channel designation signal input to the reception block are output as a poor channel determination signal. The channel setting unit 12 receives a free channel designation signal and assigns it to a receiving block that is not communicating when assigning a new channel, or to a receiving block number in the poor channel determination signal when a poor channel determination signal is input. The channel designation signal is output to the corresponding reception block.

[0008]

However, in the receiver of the conventional spread spectrum communication base station described above, when the communication quality of a certain channel is deteriorated due to the influence of noise or CDMA multiplexing, an appropriate empty channel is simply used. However, there is a problem that even communication cannot be performed until a good free channel is allocated.

The present invention solves the above problems by first finding an empty channel having a good communication quality by utilizing an unused receiving block, and when the communication quality of a certain channel is deteriorated, a good search is made in advance. It is an object of the present invention to provide a receiver of a spread spectrum communication base station capable of allocating a vacant free channel and also allocating a good vacant channel that has been previously searched for when allocating a new channel.

[0010]

In order to achieve the above-mentioned object, the present invention eliminates the conventional channel setting section, and has a conventional configuration, and an empty channel setting section for outputting a channel designation signal to an unused receiving block. , A channel management unit consisting of a best channel setting unit that sets a channel with good communication quality in the receiving block and a conventional empty channel search unit, and an unused receiving block are used to find an empty channel with good communication quality. It is configured by newly adding a best available channel quality determination unit to be searched out.

[0011]

According to the present invention, when the communication quality of a certain channel is deteriorated or a new channel is allocated, a good empty channel that was searched for in advance is allocated to obtain a good communication quality as a system. Is something that can be done.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a configuration of a receiver of a spread spectrum communication base station according to a first embodiment of the present invention.

In FIG. 1, the same reference numerals are given to the same constituent blocks as those of the conventional example shown in FIG. 4, and the description thereof will be omitted.

Here, CA is a channel management unit,
It comprises a free channel setting unit 7, a free channel searching unit 8 having a conventional function, and a best channel setting unit 9. That is, the vacant channel setting unit 7 receives the vacant channel designation signal and outputs different vacant channel designation signals as channel designation signals to all unused reception blocks.

The best channel setting section 9 receives the best available channel determination signal from the best available channel quality determination section 11 which will be described later, and when a new communication is started, it is sent to a receiving block which is not communicating or a poor channel determination signal. , Is input, a channel designation signal is output to the reception blocks 1, 2, ... N corresponding to the poor channel determination signal. As in the conventional case, the vacant channel search unit 8 receives a channel designation signal, searches for a vacant channel, and outputs a vacant channel designation signal.

Further, the above-mentioned best available channel quality judging section 11 is sequentially inputted with the correlation values of all the unused receiving blocks 1, 2, ... N and the channel designating signal corresponding to the receiving blocks, and Among them, the channel designating signal corresponding to the receiving block having the lowest peak value and average value of the correlation value is output as the best free channel determination signal.

The operation of the receiver of the spread spectrum communication base station configured as described above will be described below. Of the n receiving blocks, receiving blocks 1 to 1
It is assumed that each n-1 is receiving a transmission signal from a particular desired station. Further, the best channel setting unit 9 uses the radio units 1 to n in the reception blocks 1 to n-1 as channel designation signals at the start of communication of the respective reception blocks.
-1 and the spread code generators 1 to n-1 are connected to the frequency setting signal 1
.About.n-1 and spread code setting signals 1 to n-1 are output.

Since the receiving blocks 1 to n-1 perform the same operation, the receiving block 1 will be described in particular. The antenna 1 receives the transmission signal transmitted by the desired station and outputs the reception signal. The radio unit 1 (21) can receive the carrier frequency of the desired station by the frequency setting signal 1, demodulates the received signal from the carrier frequency to the baseband frequency, and outputs the received baseband signal 1. The spread code generator 1 (31) can generate the same spread code 1 as the spread code of the desired station by the spread code setting signal 1. The despreading unit 1 (41) receives the received baseband signal 1 output from the wireless unit 1 (21) and the spreading code 1 output from the spreading code generating unit 1 (31), and outputs a correlation value 1. The data reproducing unit 1 (51) receives the correlation value 1 and outputs reproduced data 1. The line interface unit 6 reproduces the reproduction data 1 to n.
-1 is input, the line connection data in the reproduction data is connected to the line, and the line data is output.

The vacant channel search unit 8 receives the channel designating signals 1 to n-1, searches for a vacant channel from all combinations of the frequency setting signal and the spread code setting signal, and outputs it as a vacant channel designating signal. To do. The vacant channel setting unit 7 receives the vacant channel designating signal, and sequentially outputs the channel designating signals of all the vacant channels to the unused receiving block n and the best vacant channel quality judging unit 11 at fixed time intervals. At this time, since there is currently no desired station in the reception block, the peak value and the average value of the correlation value n of the output of the despreading unit n for each channel designation signal are relatively low. The best empty channel quality judgment unit 11 receives the correlation value n for the channel designating signal that changes at a constant time interval, and when the channel designating signals of all the empty channels are input, the peak value and the average value of the correlation value n are the lowest. And outputs the channel designation signal as the best available channel determination signal.

The channel quality determination unit 10 receives the channel designation signals 1 to n-1, and receives blocks 1 to n.
When the correlation values 1 to n-1 of -1 output are continuously input and the peak value of the correlation value continues to fall below the specified value for the specified time, the number of the reception block (1 to 1 that outputs the correlation value
n-1) and the channel designation signal input to the reception block are output as a poor channel determination signal. The best channel setting unit 9 receives the best available channel determination signal and enters a reception block that is not communicating when allocating a new channel, or receives a poor channel determination signal when a poor channel determination signal is received. The channel designation signal is output to the reception block corresponding to the number.

By performing such an operation, it is possible to allocate an empty channel having good communication quality to a channel having poor communication quality or a new channel. Therefore, since the channel with good communication quality is positively used, communication with good communication quality can be performed systematically.

In CDMA, a plurality of spread codes can be multiplexed on one carrier frequency, so that the number of reception baseband blocks can be connected in parallel to one radio unit by the allowable multiplex number. Therefore, as shown in the block diagram of the second embodiment of FIG. 2, by connecting the receiving baseband blocks RB1, RB2, ..., RBn to one radio unit in parallel, the number of radio units is reduced and The same operation as the receiver of the spread spectrum communication base station can be performed.

Further, in order to miniaturize the base station, as shown in FIGS.
The empty channel setting unit 7, the empty channel searching unit 8, the best channel setting unit 9, the channel quality judging unit 10 and the best empty channel quality judging unit 11 which are configured in the receiver of the above spread spectrum communication base station are delete. The removed parts 7, 8, 9, 10, and 11 are shown in FIG.
As shown in the block diagram of the third embodiment of the present invention, in addition to the line interface unit 6 arranged in the system controller B for controlling the ordinary base station A and the system controller 13 for controlling a plurality of base stations, And is placed in the system controller B. As a result, by inputting / outputting the correlation value of the receiver output of the spread spectrum communication base station A and the channel designation signal of the output of the system control device B through the respective line interface units 6, the system can be used as a spread spectrum communication base station. The receiver at station A can operate as described above. In the case of the cell configuration, the system controller can control a plurality of base stations, so that more efficient channel utilization can be performed.

[0024]

As described above, the receiver of the spread spectrum communication base station of the present invention uses the channel of good communication quality found in advance when the communication quality of the currently used channel deteriorates. It is possible to provide a receiver of a spread spectrum communication base station that can be changed and that can allocate a channel that has been found in advance and has good communication quality when allocating a new channel.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a receiver of a spread spectrum communication base station according to a first embodiment of the present invention.

FIG. 2 is a block diagram configured by reducing the number of radio units of a receiver of a spread spectrum communication base station in a second exemplary embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration in which a part of a receiver of a spread spectrum communication base station is arranged in a system control device for downsizing of a base station in a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a receiver of a conventional spread spectrum communication base station.

[Explanation of symbols]

1 ... Antenna, 6 ... Line interface section, 7 ...
Free channel setting section, 8 ... Free channel search section,
9 ... Best channel setting unit, 10 ... Channel quality determination unit, 11 ... Best free channel quality determination unit, 12 ... Channel setting unit, 13 ... System control unit, 21 ... Wireless unit
(1), 22 ... Radio section (2), 2n ... Radio section (n), 31 ... Spread code generation section (1), 32 ... Spread code generation section (2), 3n ... Spread code generation section (n), 41 ... Despreader (1), 42 ... Despreader
(2), 4n ... despreading section (n), 51 ... data reproducing section (1), 5
2 ... Data playback unit (2), 5n ... Data playback unit (n), CA
... channel management unit, RB1 ... reception baseband block 1, RB2 ... reception baseband block 2, R
Bn ... Reception baseband block n.

Claims (3)

[Claims] 1. A frequency setting signal is input, a received signal is demodulated from a carrier frequency to a baseband frequency, a radio section for outputting a received baseband signal, and a spread code setting signal is input, and a corresponding spread code is generated. A spread code generator, which receives a received baseband signal, and a despreader which despreads with a spread code and outputs a correlation value, and a correlation value are input,
A plurality of receiving blocks composed of a data reproducing unit that reproduces data, correlation values of all the receiving block outputs that are not communicating, and channel designation signals of the receiving blocks are sequentially input, and the receiving block having the lowest correlation value is received. The best available channel quality determination unit that outputs the corresponding available channel designation signal as the best available channel determination signal, the correlation values of all the receiving block outputs that are in communication, and the channel designating signal of the receiving block are input, and a certain receiving block output If the correlation value of is less than or equal to a specified value, the best free channel determination signal is input when the communication is started with the channel quality determination unit that outputs the channel designation signal corresponding to the reception block as the poor channel determination signal. The best available channel judgment signal is sent to the receiving block used for , And when the poor channel determination signal is input, the best free channel determination signal is input, the best free channel determination signal is output as the channel designation signal to the receiving block corresponding to the poor channel determination signal, and communication is performed. A receiver for a spread spectrum communication base station, comprising a channel management unit that outputs a channel designation signal to all not-yet-received blocks. 2. A spreading code generating section, a despreading section, and a data reproducing section in a receiving block are used as receiving baseband blocks, and one wireless section is connected in parallel with the receiving baseband blocks by an allowable multiplexing number of CDMA, 2. The spread spectrum communication base station according to claim 1, wherein the number of wireless units is reduced by connecting a channel management unit, a channel quality determination unit and an idle channel quality determination unit to all wireless units and all received baseband blocks. Receiver. 3. A channel management unit, a channel quality determination unit, and a free channel quality determination unit are arranged in a system control device outside a receiver of a spread spectrum communication base station,
2. The structure of a receiver of a spread spectrum communication base station is simplified by inputting and outputting a correlation value and a channel designation signal via a line interface section.
Or the receiver of the spread spectrum communication base station described in 2.