KR102248698B1 - Measurement method for bit error rate of hd radio receiver - Google Patents

Abstract

The method of measuring the bit error rate of an HD radio receiver includes: (a) using a test output from a physical layer of the HD radio receiver that has received a test vector and a test file previously stored for testing, the test output and position are Measuring a delay value that is location information of the matched test file; And (b) measuring the bit error rate of the output of the physical layer by using the delay value measured in step (a).

Description

MEASUREMENT METHOD FOR BIT ERROR RATE OF HD RADIO RECEIVER}

The present invention relates to a method of measuring a bit error rate of an HD radio receiver.

HD (High Definition) radio is a new radio method called IBOC (in-band on-channel) developed by Ibiquity of the United States. It is a standard that can transmit digital audio and data to existing analog signals.

HD radio can transmit analog and digital signals together in the same band, and has a feature that it can transmit multiple channels at the same time.

In HD radio receivers, bit error rate (BER) is an important factor in receiver performance, and there is a need for a simple and convenient measurement method.

Korean Patent Publication No. 10-2001-0011331: Bit error rate measurement device (published on February 15, 2001).

An object of the present invention is to provide a method for measuring a bit error rate of an HD radio receiver capable of measuring a bit error rate in a short time and in a simple manner by two modes. have.

The method of measuring the bit error rate of the HD radio receiver of the present invention includes: (a) the test output from the physical layer of the HD radio receiver receiving the test vector and the test file stored in advance for the test. Measuring a delay value, which is location information of the test file whose location is identical to that of the test file; And (b) measuring the bit error rate of the output of the physical layer by using the delay value measured in step (a).

Specifically, the step (a) may include: (a-1) buffering the test output in a first shift buffer by 1 byte; And (a-2) measuring the delay value while buffering the test file in a second shift buffer by 1 byte.

In addition, the step (a-1) may include: (a-1-1) storing 1 byte of the test output in the first shift buffer; And (a-1-2) determining whether the number of times stored in the first shift buffer is equal to a first predetermined value after completion of the step (a-1-1); including, the (a-1-1) As a result of the determination in step -1-2), if the number of times stored in the first shift buffer is different from the first value, the process moves to step (a-1-1) and shifts the first shift buffer, In addition, it is preferable to further store 1 byte of the output of the physical layer. The first value may be equal to or a multiple of the size of the first shift buffer.

In addition, the step (a-2), (a-2-1), as a result of the determination of step (a-1-2), when the number of times of storage in the first shift buffer is the same as the first value, Reading 1 byte from the current part of the test file; (a-2-2) determining whether the current part of step (a-2-1) is the end of the test file; (a-2-3) If the test file is not the end as a result of the determination in step (a-2-2), 1 byte read in step (a-2-1) is added to the second shift buffer. Storing; And (a-2-4) re-opening the test file when the test file is at the end as a result of the determination in step (a-2-2), the step (a-2-4). After completion of, the process moves to step (a-1-1). In addition, the step (a-2), (a-2-5) after the completion of the step (a-2-3), by comparing the first shift buffer and the second shift buffer, Counting the number; (a-2-6) comparing the counted value in step (a-2-5) with a preset second value; And (a-2-7) as a result of the comparison in step (a-2-6), when the value counted in step (a-2-5) is greater than or equal to the second value, the number of bytes read from the test file. And storing the delay value as the delay value. In addition, the step (a-2), when the comparison result of the step (a-2-6), the value counted in the step (a-2-5) is less than the second value, the (a-2) Go to step -1).

Preferably, the step (b) includes: (b-1) buffering the test output in the first shift buffer by 1 byte; (b-2) reading the test file as much as the delay value and buffering it in the second shift buffer; And (b-3) measuring a bit error rate of the output of the physical layer.

In addition, step (b-1) may include (b-1-1) storing 1 byte of the test output in the first shift buffer; And (b-1-2) after completion of the (b-1-1) step, determining whether the number of times to be stored in the first shift buffer is equal to a predetermined first value; As a result of the determination in step -1-2), if the number of times stored in the first shift buffer is different from the first value, the process moves to step (b-1-1) and shifts the first shift buffer, In addition, it is preferable to further store 1 byte of the output of the physical layer. The first value may be equal to or a multiple of the size of the first shift buffer.

In addition, the step (b-2), (b-2-1), as a result of the determination in step (b-1-2), when the number of times of storage in the first shift buffer is the same as the first value, And storing the delay value from the first part of the test file in the second shift buffer.

In addition, in step (b-3), it is preferable to measure the bit error rate by comparing the test output with the test file.

According to the method for measuring the bit error rate of the HD radio receiver of the present invention, it is possible to measure the bit error rate in a simple and short time by using two modes.

1 is an explanatory diagram of transmission and reception of a general HD radio.
2 is an explanatory diagram of a use section of a test vector output from a physical layer of a transmitter.
3 is a flowchart of a method for measuring a bit error rate of an HD radio receiver according to the present invention.
4 is a detailed flowchart of step S100.
5 is a detailed flowchart of step S200.

Hereinafter, a method of measuring a bit error rate of an HD radio receiver according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. It goes without saying that the following examples of the present invention are intended to embody the present invention and do not limit or limit the scope of the present invention. What can be easily inferred by experts in the technical field to which the present invention belongs from the detailed description and examples of the present invention is interpreted as belonging to the scope of the present invention.

The bit error rate measurement of the HD radio receiver 200 according to an exemplary embodiment of the present invention may be performed by a device connected to the HD radio receiver 200 to be measured. In addition, it is preferable that the apparatus includes a processor and a memory, and the method of measuring the bit error rate in the HD radio receiver 200 may be implemented in the form of a computer program executed by the processor. Examples of processors include MCUs, CPUs, and DSPs.

1 is a diagram illustrating transmission and reception of a general HD radio.

As can be seen from FIG. 1, the HD radio transmitter 100 includes a physical layer 110 called L1 (Layer 1) and a data link layer 120 called L2 (Layer 2). ).

In addition, the HD radio receiver 200 also includes a physical layer 210 and a data connection layer 220.

In general, the physical layer 210 of the receiver 200 is implemented by hardware, and the data connection layer 220 is implemented by software.

In order to measure the bit error rate (BER) of the receiver 200, the physical layer 110 of the transmitter 100 outputs a test vector, and the receiver 200 receives the test vector. It goes through a process of comparing the test output, which is the output of 210, with the test file previously stored. That is, the test vector and the test file are the same data, and a data error in the process of transmitting/receiving from the transmitter 100 to the receiver 200 is measured.

FIG. 2 is an explanatory diagram of a use section of a test vector output from the physical layer 110 of the transmitter 100.

As can be seen from FIG. 2, the starting point of the test vector output from the physical layer 110 of the transmitter 100 may vary depending on the situation, so that the test output of the physical layer 210 of the receiver 200 and the It is necessary to measure the delay value, which is the location information of the test file where the location matches.

For reference, in the last block of the physical layer 210 of the receiver 200, a descrambler, which is a circuit that generates original data from an arbitrary code sequence created by the scrambler, is located, so that the physical layer 210 of the receiver 200 The output of) becomes the output of the descrambler.

3 is a flowchart of a method for measuring a bit error rate of the HD radio receiver 200 according to the present invention.

As can be seen from FIG. 3, the preferred method of measuring the bit error rate of the HD radio receiver 200 of the present invention includes a test output from the physical layer 210 of the HD radio receiver 200 receiving a test vector and Using the test file stored in advance for the test, the physical layer 210 by using the delay value, which is the position information of the test file whose position is matched with the test output (S100) and the delay value measured in the step S100. ) Measuring the bit error rate of the output (S200).

Step S100 is a sync mode in which the test output of the physical layer 210 of the receiver 200 and the location of the test file are matched.

In addition, step S200 is a kind of delay mode, by synchronizing the test output and the test file of the physical layer 210 of the receiver 200 at a time using the delay value measured in step S100, This is a process that allows you to measure the bit error rate.

4 shows a detailed flowchart of step S100.

As can be seen from FIG. 4, in step S100, the test output is buffered in the first shift buffer by 1 byte (S110), the test file is buffered in the second shift buffer by 1 byte, and the delay value is measured. Step S120 and measuring the bit error rate of the output of the physical layer 210 of the receiver 200 (S130).

In step S110, after the completion of steps S111 and S111, storing one byte of the test output in the array of the first shift buffer, it is determined whether the number of times to be stored in the first shift buffer is equal to a predetermined first value. It includes step S112.

As a result of the determination in step S112, if the number of times to be stored in the first shift buffer is different from the first value, the process moves to step S111 to shift the first shift buffer, and additionally, one byte of the output of the physical layer 210 is added. Will be saved. That is, step S111 is a step for reading the test output one byte sequentially from the beginning. In addition, step S112 is a step for performing step S111 and delaying by a predetermined value for each logical channel.

The first value is preferably equal to or a multiple of the size of the first shift buffer. For example, if the size of the first shift buffer is 40 bytes, the first value may be set as 40 bytes or 80 bytes. The first shift buffer is a FIFO (First-In First-Out) and sequentially stores the read data.

In step S120, when the determination result in step S112, the number of times stored in the first shift buffer is the same as the first value, reading 1 byte from the current part of the test file (S121), and the current part of step S121 is tested. Determining whether the file is the end (S122), if the test file is not the end as a result of the determination in step S122, storing 1 byte read in step S121 in the arrangement of the second shift buffer (S123) and S122 If the test file is the end as a result of the determination of the step, the test file is reopened (S124).

In addition, after completion of step S124, the process moves to step S111.

The current part of the test file in step S121 becomes the first 1-byte part when the first test file is opened. In step S121, 1 byte is read sequentially from the beginning of the test file.

The second shift buffer is a FIFO (First-In First-Out) and sequentially stores the read data.

Further, in step S120, after the completion of step S123, the first shift buffer and the second shift buffer are compared, and the number of bits that match each other is counted (S125), the value counted in step S125 and the preset second value. Comparing (S126) and the comparison result of the step S126, when the value counted in step S125 is greater than or equal to the second value, storing the number of bytes read from the test file as a delay value (S127). It is done.

In addition, as a result of the comparison in step S126, if the value counted in step S125 is less than the second value, the process moves to step S121. After moving to step S121, the current part of the test file in step S121 is moved by 1 byte.

In step S125, the first shift buffer and the second shift buffer are compared bit by bit to determine the number of matching bits. In addition, in step S126, if the number of matching bits is greater than or equal to the second value, the test output of the physical layer 210 of the receiver 200 and the location of the test file are found to match the sync. Is determined to be synchronized. The second value is preferably set so that the ratio of the number of matching bits by comparing the first shift buffer and the second shift buffer bit by bit is 90% or more. In step S127, the number of bytes read from the test file up to now is stored as a delay value. The delay value can be said to be a value taken after the test output and the test file are synchronized, and then the synchronization of the test output and the test file is measured.

If a sync is not found until the end of the test file while performing steps S121 to S126, the test file is reopened by step S124.

Further, in step S130, the bit error rate is measured by reading the test output in byte units and comparing the test file with the bit unit.

5 shows a detailed flowchart of step S200.

As can be seen from FIG. 5, in step S200, the test output is buffered in the first shift buffer by 1 byte (S210), the test file is read as much as the delay value and buffered in the second shift buffer by 1 byte. It characterized in that it comprises the step (S220) and the step (S230) of measuring the bit error rate of the output of the physical layer 210 of the receiver 200.

Specifically, in step S210, after the completion of steps S211 and S211 of storing one byte of the test output in the array of the first shift buffer, it is determined whether the number of times to be stored in the first shift buffer is equal to a predetermined first value. It includes a determining step (S212).

In step S210, as a result of the determination in step S212, if the number of times to be stored in the first shift buffer is different from the first value, the process moves to step S211 and shifts the first shift buffer. It is characterized by storing an additional byte.

That is, step S211 is a step for reading the test output one byte sequentially from the beginning. In addition, step S212 is a step for performing step S211 and delaying by a predetermined value for each logical channel.

The logical channel is a term defined by the HD radio standard specification document (SY_IDD_1010s, HD RadioTM Air Interface Design Description Layer 1 FM).

The first value is preferably equal to or a multiple of the size of the first shift buffer. For example, if the size of the first shift buffer is 40 bytes, the first value may be set as 40 bytes or 80 bytes. The first shift buffer sequentially stores the read data to become FIFO (First-In First-Out).

In step S220, as a result of the determination in step S212, if the number of times to be stored in the first shift buffer is equal to the first value, a delay value is read from the first part of the test file and stored in the array of the second shift buffer (S221. ) And comparing the first shift buffer and the second shift buffer, and counting the number of bits that match each other (S222).

In addition, in step S230, the bit error rate is measured by reading the test output in units of bytes and comparing them with the test files in units of bits.

According to the method for measuring the bit error rate of the HD radio receiver 200 of the present invention, it can be seen that the bit error rate can be measured simply and in a short time by two modes.

100: HD radio transmitter
110: physical layer of the transmitter
120: the data link layer of the transmitter
200: HD radio receiver
210: physical layer of the receiver
220: the data connection layer of the receiver

Claims (13)

In the method of measuring the bit error rate of an HD radio receiver,
(a) Using the test output from the physical layer of the HD radio receiver that has received the test vector and a test file previously stored for testing, delay, which is the position information of the test file whose position matches the test output Measuring a value; And
(b) measuring the bit error rate of the output of the physical layer using the delay value measured in step (a); including,
The step (a),
(a-1) buffering the test output in a first shift buffer by 1 byte; And
(a-2) measuring the delay value while buffering the test file in a second shift buffer by 1 byte. delete The method of claim 1
The step (a-1),
(a-1-1) storing 1 byte of the test output in the first shift buffer; And
(a-1-2) after completion of the step (a-1-1), determining whether the number of times of storage in the first shift buffer is equal to a predetermined first value; including,
As a result of the determination in step (a-1-2), if the number of times to be stored in the first shift buffer is different from the first value, the process moves to step (a-1-1) to change the first shift buffer. By shifting, further storing 1 byte of the output of the physical layer. The method of claim 3,
The first value is,
The bit error rate measurement method, characterized in that the same as or a multiple of the size of the first shift buffer. The method according to claim 3 or 4,
The step (a-2),
(a-2-1) As a result of the determination in step (a-1-2), when the number of times to be stored in the first shift buffer is the same as the first value, 1 byte is read from the current part of the test file. A step;
(a-2-2) determining whether the current part of step (a-2-1) is the end of the test file; And
(a-2-3) If the test file is not the end as a result of the determination in step (a-2-2), 1 byte read in step (a-2-1) is stored in the second shift buffer. The method of measuring a bit error rate comprising a; storing step. The method of claim 5,
The step (a-2),
(a-2-4) when the test file is the end of the determination result of step (a-2-2), reopening the test file;
After completing the step (a-2-4), the method of measuring a bit error rate, characterized in that moving to the step (a-1-1). The method of claim 5,
The step (a-2),
(a-2-5) after completion of the step (a-2-3), comparing the first shift buffer and the second shift buffer, and counting the number of matching bits;
(a-2-6) comparing the counted value in step (a-2-5) with a preset second value; And
(a-2-7) As a result of the comparison in step (a-2-6), if the value counted in step (a-2-5) is greater than or equal to the second value, the number of bytes read from the test file And storing the delay value as the delay value. The method of claim 7,
The step (a-2),
As a result of the comparison in step (a-2-6), when the value counted in step (a-2-5) is less than the second value, it moves to step (a-2-1). How to measure the bit error rate. The method of claim 1,
The step (b),
(b-1) buffering the test output in the first shift buffer by 1 byte;
(b-2) reading the test file as much as the delay value and buffering it in the second shift buffer; And
(b-3) measuring the bit error rate of the output of the physical layer. The method of claim 9,
The step (b-1),
(b-1-1) storing 1 byte of the test output in the first shift buffer; And
(b-1-2) after completion of the step (b-1-1), determining whether the number of times of storage in the first shift buffer is equal to a predetermined first value; Including,
As a result of the determination in step (b-1-2), if the number of times to be stored in the first shift buffer is different from the first value, the first shift buffer is moved to step (b-1-1). By shifting, further storing 1 byte of the output of the physical layer. The method of claim 10,
The first value is,
The bit error rate measurement method, characterized in that the same as or a multiple of the size of the first shift buffer. The method of claim 10,
The step (b-2),
(b-2-1) As a result of the determination in step (b-1-2), if the number of times to be stored in the first shift buffer is the same as the first value, the delay value is equal to the delay value from the beginning of the test file. Reading and storing the data in the second shift buffer. The method of claim 9,
The step (b-3),
And measuring a bit error rate by comparing the test output with the test file.

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