WO2010148835A1

WO2010148835A1 - Method and base station for detecting distance to mobile station in orthogonal frequency division multiple access (ofdma) system

Info

Publication number: WO2010148835A1
Application number: PCT/CN2010/072889
Authority: WO
Inventors: 陈世海
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-11-20
Filing date: 2010-05-18
Publication date: 2010-12-29
Also published as: CN102075210B; CN102075210A

Abstract

The present invention proposes a method and base station for detecting the distance to mobile station in OFDMA system. Said method includes the following steps: the base station allocates detection region for the mobile station in advance, and then, when an Orthogonal Frequency Division Multiplexing (OFDM) signal sent by the mobile station has been received, extracts the OFDM symbol of the signal in said detection region; according to said OFDM symbol, peak power and average power are determined; according to said peak power and average power, it is detected whether ranging codes exist in said OFDM symbol, if ranging codes exist, the distance to said mobile station is calculated, and said mobile station is notified; said base station includes a detection region allocation unit, an OFDM signal processing unit, a ranging code detection unit and a calculation unit for calculating the distance to mobile station. The present invention can be implemented simply, even in existing circuit, with low cost, small development difficulty and high reliability.

Description

State methods and base areas in the OFDMA system

This paper relates to the field of communication wood, especially to the measurement method and basis in the system (F A, O hhogo a Feq e cy v o pex gAcce ). Background

OF A is multi-carrier wood. In recent years, OF A wood has been obtained in the field, it has been fully interconnected by microwave (A) and 3GPP.

(TE) physics.

In the OF A system, different letter requirements are the same, so the method is not the same, and the channel is used for uplink synchronization. In the OF A system of EEE 802.6e,

The same upstream synchronization ( a g g) method is not available. The method requires standing at a specific ( a g gCod ), and then to .

In the OF A system of EEE 802.16e, the allocation, the force test ( a g g ego ), and

. But also the small coverage is limited. If the same letter goes back and forth, the test of the station friend will always arrive. That is, the small coverage is proportional to the size of and .

Same, the fruit is too, the station friend's OF, and each, each also rescue, and other Upside health. C 2 0 0109480.5 "Assignment" is reserved for the same reduction. However, the allocation of reservations without the reservation of the same letter has no effect on enhancing small coverage. content

The purpose of this book is to provide the measurement method and basis in the F A system, which can enhance the small coverage.

This paper proposes the measurement method in the OF A system, pre-allocation, the method force

Receiving the OF of the station friend, extracting the OF temple in the station

Based on the OF power and the mean power of the OF, the stated, will be calculated as described above.

And the reservation is reserved, and the reservation and the reservation occupy the same measurement.

, the method is near

The small coverage size is allocated to the reserved said reserved phase, and the occupied OF Fu Temple is in the occupied OF Fu Temple

The allocation is to fix the assigned position of the measured position.

, said

Among them, it means that the reserved O-characteric Ce is up to the same function as the c-speed T OF symbol. , the OF temple power and the mean power

Before removing the OF temple

Remove the former OF Fu Temple Express (FFT) to get the carrier sequence

5 obtained carrier sequence extracted from the carrier sequence

Generating a local test, the generated local phase of the carrier sequence, to obtain a phase sequence

The resulting phase sequence 0 , fast ( FF ) , yields an FFT sequence

The power and mean power of the resulting FFT sequence, the location of the power of the mercury.

, the OF symbol exists in the temple

The second gate having the average power ratio greater than the gate, and the average power is greater than the second gate, and 5 is present in the OF symbol temple.

Said

If there is a medium in the above-mentioned OF fiction temple, and the second OF symbol does not exist in the temple, then the Os

If the above is present in both the first OF temple and the second OF temple 0, then the Os

If there is no such thing as the OF symbol in the temple, but there is a 1 OF symbol in the temple, then the P ten x where s, the position of the power of the medium OF is FFTized OF in the 5 Tied in. The OF in the The location of the power.

This step is proposed, the distribution of sheep, OF sheep, sheep and sheep, the distribution of sheep, in the distribution

The OF sheep, in extracting the OF of the stationmate's OF, from the OF, is said to have the OF power and the mean power

Whether the sheep, the power and the mean power of the root, exist in the OF temple

The sheep, as, will be calculated as described.

, the distribution of the sheep, the position of the step and the sequence of the test.

, the assigned sheep is allocated and reserved,

The allocation , in the distribution

The reserved allocation is reserved for the size of the root size to be reserved.

, the OF reception, the FFT, the extraction, the phase, the FFT, and the power,

Receiving, extracting the received OF from the OF of the receiving station friend, and removing the extracted OF temple before the OF of the temple

The FFT is extracted according to the FFT before the removal of the OF, and the extracted carrier sequence The phase, in generating a local test, extracting the extracted carrier sequence and the local phase measurement

The FFT, the result of the phase FFT, the power, the power of the FFT sequence, and the mean power, the location of the mercury power.

Comparing and comparing the sheep, comparing the magnitude of the threshold value of the average power ratio of the power of the OF Fu Temple and comparing the magnitude of the second threshold of the average power

Said, in the pre-OF Fu Temple is the most intermediate OF temple.

This added a reservation, the existing survey domain is composed of the same, and does not occupy the other OF with the other sides of the OF Temple, this multi-fu Temple, you can calculate more, increase the coverage. This sheep can be used on the current high-speed hardware, low cost, small, reliable and does not need to repair the current OF A system, so it is not caused.

Description

1 The first process of the measurement method in the OF A system

3 The second process of the measurement method in the OF A system 4 The principle of the force book

The second principle of 5 power. Hugh way

1 shows the first process of the measurement method in the system, the next step

Step S 1 is assigned.

2 shows the illustration of the force, the said and the reserved, the occupies 2 OF of the temple, which respectively and +, and the small coverage to, the following formula (1)

2

Ce d (1)

cT

The reserved reservation takes up 3 OF Fu Temple, then k+2 +3 +4

In step S102, the assigned position in the allocation is as described in the same sequence.

Step S103 receives the OF, and extracts the OF symbol in the OF.

In step S104, the OF power and the mean power, and the position of the mercury power.

In step S105, the power and the average power are present in the OF symbol temple, and if yes, step S106 is performed, otherwise, the previous process.

Step S106, wherein the location of the power is as described above.

3 shows that the second process of the measurement method in the OF A system has been assigned, and the position and the sequence of the measurement are also passed.

Step S301 extracts the OF symbol temple of the received station friend's OF.

In this case, OF is extracted. Step S3 2 Remove the front of the OF temple.

Step S3 3 removes the front OF FFT FFT to obtain the carrier R( ).

Step S3 4, the carrier sequence S, ( ) extracted in the carrier sequence R, ( )

S R( (m [0 1

Wherein, B is a set, indicating the location of the carrier sequence in which the set, the set has a common subcarrier, indicating that the front carrier is in the middle.

Step S3 5 generates a local test P( )

The upper group is easy to follow, and the generated local sequence is determined by the solid sequence.

The locally generated P() phase generated by the carrier sequence S, ( ) described in step S3 6 obtains a phase sequence C, ( )

C, ) S ) P(m)

Step S3 7 describes the phase sequence C, ( ) 0 .

That is, C) is serialized into complete, and then the phase sequence is sequenced to the carrier sequence position where

0 [

(B(m)) C m [

Wherein, the phase sequence C) FFT obtained by the phase sequence S3 8 0 obtained by C representing the FFT is 0, and the FFT sequence Y, ( ) is obtained.

J C( ) 0 V

Step S3 9, the power Pe of the FFT sequence, and the position power P of the mean power e mercury, the power Pe, ie

e , (

"

o eak

The power and the mean power of all the OF temples in the range, and whether the OF symbol is present, that is, step S31 is performed.

If the ratio of the power mean power of the first OF f temple is greater than the first port, and the second power of the average power is greater than the second Th2, the OF symbol is present in the temple, and step S311 is performed. If the OF symbol is not present, go to step S314.

The remainder of this step

e ea

If the ratio of the power average power of the second OF symbol in the step S311 is greater than the first port, and if the average power is greater than the second Th, then step S313 is performed, otherwise step S312 is performed. Surplus

Eak / ea 2 T

Ea step 5312, as described in equation (2), special step 5318 is performed

(2) Step S313 is as described in the formula (3), and the special step S318 is performed.

P s (3) Step S314 Before ( ) The ratio of the power average of the OF temple is greater than the first port T, and the average power is greater than the second Th2. If yes, step S315 is performed, otherwise, step S316 is performed. The remainder of this step

Ea eea

4ea

Step 5315, as described in the formula (4), the special step 5318 is performed.

P ten x (4) formula (2) 3) 4), the s, the position of the power in the TEM of the first OFDM temple FFT

OF Fu Temple is in the middle of the . The position of the power of the 1 OF symbol in the temple.

In step S316, whether the front OF temple is the most intermediate OF in the middle, if yes, otherwise, step S318 is performed.

Step 5317 Let 1, special step 5314 be executed.

Step 5318 will result in the resulting process described above.

The first principle of the force shown in Figure 4, described above, assigns sheep 100 OF sheep 200, golden sheep 300 and sheep 400

Among them, the distribution of sheep 100 in distribution

The position and sequence of measurements are solid.

O D sheep 200 for extraction

The OF power in the temple is based on the OF power and the mean power. Whether the OFD symbol exists in the temple. The location of the power will be as described. 5 shows the second principle of the force, with the distribution of sheep 0 OF sheep 200, sheep 300 and

Sheep 400, wherein the assigned sheep 100 is assigned 110, the pre-allocated 120 OF 200 receives 210 FFT 220, the extracted 230, the phase 240 FFT 250, the power 260 sheep 300 compares 310 and 31. Among them, the allocation is 110.

The reserved allocation 120 is allocated to the size of the small size of the root to be reserved.

The receiving 210 receives the OF of the station friend and extracts the received OF in the said OF symbol temple to remove the extracted OF symbol temple before. Extract 230 the extracted carrier sequence.

The phase 240 generates a local measurement, and the extraction 230 extracts the carrier sequence and the local phase.

, get the FFT sequence. The location of the power of mercury.

Comparing 310 to the magnitude of the first threshold of the ratio of the power mean power of the OF festa and comparing the magnitude of the second threshold of the mean power. OF. The other functions of the sheep in this book are the same as those described in the first paragraph. The above-mentioned powers are not limited to the solid, and the processes or the like that are made by using the description and the attached contents are directly or in the same wood field as the other phases.

Solid.

Claims

Claim

1. The method of measuring in (F) system, which is characterized by pre-allocation, the method

Receiving the OF of the station friend, extracting the OF temple in the station

Based on the OF power and the mean power

Power and mean power

忖, the stated, will be calculated as described above.

2. The method of claim 1 wherein:

And the reservation, and the reservation and the reservation occupy the same measurement.

3. The method of claim 2, wherein the method is near

The allocation is to fix the assigned position of the measured position.

4. The method of claim 3, wherein the ce

c the reservation

Among them, it means that the reserved O-character Ce-up function d is small enough to cover the same C light speed T OF.

5. The method of claim 1, wherein the OF power and the mean power are

Before removing the OF temple

Remove the front OF temple fast (FFT), get the carrier Sequence

Carrier sequence extracted from the obtained carrier sequence

The obtained phase sequence 0 , fast ( FF ) , yields the F T sequence

6. The method of claim 1 or 5, wherein the OF symbol is present in the temple

And the second gate having the average power ratio greater than the gate, and the second gate having the average power greater than that is present in the OF symbol temple.

7. The method of claim 1, wherein the result is that the fruit is present in the first medium OF temple, and the second OF symbol does not exist in the temple, the Pos

If there is any of the above-mentioned OF Fu Temple and the second OF Fu Temple, then the Pos

If the OF symbol is not present in the temple, but the OF symbol is present in the temple, then the P ten x of which, the s, the position of the TEM of the temple is the FFT of the OF symbol in the temple The Pos in the middle, the OF in the

The location of the power.

8. The special feature is that the sheep, the OF sheep, the sheep and the sheep are distributed,

Assigning sheep to distribution

The sheep, as, will be calculated as described.

9. The method of claim 8, wherein the assigning the sheep, the position of the step and the sequence of the measurements are solid.

10. The method of claim 9, wherein the assigning sheep allocation and the reserve allocation are,

The allocation , in the distribution

11. The method of claim 9 or 10, wherein the OF is

Receive, FFT, extract, phase, FFT, and power where

12. The method of claim 9 or 10, wherein the sheep are compared with

Comparing the magnitudes of the threshold values of the average power ratios of the powers of OF Fushun and comparing the magnitudes of the second thresholds of the average powers

In the above, whether or not the OF is the most intermediate OF.