JPH0563685A - Inter-carrier delay difference adjustment device - Google Patents

Abstract

PURPOSE:To simplify the adjustment and to prevent mis-adjustment by automating the delay adjustment between carriers implemented at system built-up or the like. CONSTITUTION:An absolute delay detection circuit 11 receives data signal strings D1-Dn demodulated from a signal sent via a standby line with n-sets of carriers and frame synchronization pulses F1-Fn to be recovered respectively and detects a data signal string latest and sends information Sa. A relative delay detection circuit 12 receives a data signal string, a frame synchronization pulse and the information Sa and detects a relative delay difference of the n-sets of data signal strings based on a data signal string latest to generate delay control data S1-Sn. A delay data storage circuit 13 stores the delay control data and sends it, Delay circuits 1-n give each data signal string and a frame synchronization pulse in response to the delay control data S1-Sn to make the delay difference between the n-sets of data signal strings coincident with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-carrier delay difference adjuster applied to a multi-carrier digital radio communication system, and more particularly to a delay difference between carriers of a protection line for matrix synchronous switching between a working line and a protection line. The present invention relates to an inter-carrier delay difference adjuster for adjusting.

[0002]

2. Description of the Related Art Generally, in a multi-carrier digital radio communication system, when the quality of a working line is deteriorated due to fading or the like, a normal carrier is selected by a matrix synchronization switch on the transmitting end side and the receiving end side, Is switching from the working line to the protection line.

In this case, since there is a propagation delay difference between the line of the working line and the line of the protection line, this delay difference is compensated for on the receiving end side. However, since this propagation delay difference differs for each carrier, it is also necessary to compensate for the propagation delay difference that occurs between carriers on the protection line. Therefore, an inter-carrier delay difference adjuster is provided.

This type of conventional inter-carrier delay difference adjuster is composed of a delay circuit composed of a shift register or the like, and delays a signal transmitted through a protection line by a predetermined amount in each delay circuit. , The delay difference between carriers is compensated.

By the way, when adjusting the delay circuit, each data signal train transmitted through the protection line and the frame synchronization pulse transmitted together with each data signal train are delayed by the delay circuit, respectively, and delayed. While observing each frame synchronization pulse that has passed through the circuit, the number of delay bits in the shift register of each delay circuit is manually adjusted so that the timings of the frame synchronization pulses of all carriers match.

[0006]

In the conventional inter-carrier delay difference adjuster described above, when adjusting the delay between carriers when constructing a system or the like, each frame synchronization pulse that has passed through the delay circuit is observed with an oscilloscope or the like. Since the number of delay bits of the shift register of each delay circuit must be manually adjusted, not only the adjustment work is complicated, but also
There is a problem that there is a possibility of making an erroneous adjustment.

An object of the present invention is to provide an inter-carrier delay which can simplify the adjustment work and prevent erroneous adjustment by automatically adjusting the inter-carrier delay when adjusting the inter-carrier delay during system construction. To provide a difference adjuster.

[0008]

SUMMARY OF THE INVENTION An inter-carrier delay difference adjuster of the present invention is a multi-channel switch that performs matrix synchronous switching from a working line to a protection line for each of n (n is an integer of 2 or more) carriers. An inter-carrier delay difference adjuster for a protection line in a carrier digital wireless communication system detects the data signal sequence that is the most delayed among the n data signal sequences transmitted by the n carriers via the protection line. Means, means for detecting a relative delay difference between the n data signal sequences based on the most delayed data signal sequence to generate delay control data, and means for storing and outputting the delay control data. A delay difference is given to each of the n data signal sequences according to the delay control data output from the storage means. It is configured to include a means for Itasa.

[0009]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. Here, the data signal sequences D1 to Dn are data signal sequences transmitted from the transmitting side via n (n is an integer of 2 or more) carriers via the protection line, and the demodulation unit of the reception device on the protection line. It is received and demodulated by (not shown). Further, the frame synchronization pulses F1 to Fn
Is a pulse that is frame-synchronized with each of the data signal sequences D1 to Dn and is similarly reproduced by a frame synchronization unit (not shown) of the receiving device.

The delay circuits 1 to n give a delay amount corresponding to the delay control data S1 to Sn to an input signal and output it to a receiving end matrix switch (not shown). in this case,
The delay circuit i (1 ≦ i ≦ n) gives the same delay to the data signal sequence Di and the frame synchronization pulse Fi. Further, the delay control data S1 to Sn are set so that the phases of the data signal trains of all carriers and the frame synchronization pulse match. Here, an absolute delay detection circuit 11, a relative delay detection circuit 12, and a delay data storage circuit 13 are provided to generate the delay control data S1 to Sn.

When the system is constructed, the adjustment of the inter-carrier delay difference adjuster is executed as follows.

First, the absolute delay detection circuit 11 receives the data signal sequences D1 to Dn and the frame synchronization pulses F1 to Fn, respectively, and detects the most delayed data signal sequence among the n data signal sequences. The detection information Sa is sent to the relative delay detection circuit 12. In addition, the relative delay detection circuit 12
Is a delay control data for detecting a relative delay difference between n data signal sequences based on the most delayed data signal sequence based on the data signal sequences D1 to Dn, the frame synchronization pulses F1 to Fn, and the detection information Sa. S1 to Sn are generated and sent to the delay data storage circuit 13. The delay data storage circuit 13 is a writable and readable nonvolatile storage circuit,
For example, EEPROM (electrically er)
The delay control data S1 to Sn are temporarily stored and sent to the delay circuits 1 to n.

By doing so, the delay circuits 1 to
n receives the delay control data S1 to Sn and gives a delay so that the phases of the data signal trains of all carriers and the frame synchronization pulse match, so that synchronous switching can be performed in the receiving end matrix switching device.

[0015]

As described above, according to the present invention, a delay circuit for delaying the carrier data signal train and the phase of the frame sync pulse in accordance with the delay control data is provided for the carrier. When adjusting the inter-carrier delay difference adjuster,
Detects the most delayed data signal sequence of a plurality of carriers, generates a delay control data by detecting the relative delay difference between a plurality of carriers with reference to this most delayed data signal sequence, further, By holding the delay control data and sending it to the corresponding delay circuit, the delay adjustment for compensating for the propagation delay difference occurring between the carriers of the protection line can be automatically performed, so the adjustment work can be simplified, It can prevent erroneous adjustment.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 1 to n delay circuit 11 absolute delay detection circuit 12 relative delay detection circuit 13 delay data storage circuit D1 to Dn data signal sequence F1 to Fn frame synchronization pulse S1 to Sn delay control data

Claims (1)

[Claims] 1. An inter-carrier delay difference adjuster for a protection line in a multi-carrier digital wireless communication system for performing matrix synchronization switching from a working line to a protection line for each of n (n is an integer of 2 or more) carriers. A means for detecting the most delayed data signal sequence of the n number of data signal sequences transmitted by the n number of carriers via the protection line, and the most delayed data signal sequence as a reference Means for detecting a relative delay difference between the n data signal strings to generate delay control data;
Means for storing and outputting the delay control data, and delaying each of the n data signal trains in accordance with the delay control data output from the storing device to obtain a delay difference between the n data signal trains. An inter-carrier delay difference adjuster comprising: means for matching.