CN101808394A - Method for improving signal-to-noise ratio of TD-SCDMA terminal transmission signal - Google Patents
Method for improving signal-to-noise ratio of TD-SCDMA terminal transmission signal Download PDFInfo
- Publication number
- CN101808394A CN101808394A CN200910046248A CN200910046248A CN101808394A CN 101808394 A CN101808394 A CN 101808394A CN 200910046248 A CN200910046248 A CN 200910046248A CN 200910046248 A CN200910046248 A CN 200910046248A CN 101808394 A CN101808394 A CN 101808394A
- Authority
- CN
- China
- Prior art keywords
- curve
- signal
- tdma
- noise ratio
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a method for improving signal-to-noise ratio of a TD-SCDMA terminal transmission signal, which improves the signal-to-noise ratio of the transmission signal of an antenna terminal. The technical scheme is as follows: the method comprises the following steps: (1) obtaining the TDMA bursting rising curve and the TDMA bursting depression curve of a terminal power amplifier; (2) carrying out smooth adjustment to the TDMA bursting rising curve in a transmitting power switch time template to ensure that the transmitting power of the terminal power amplifier slowly rises to be the maximum from the minimum; and (3) carrying out mirror image processing on the TDMA bursting depression curve of the terminal power amplifier according to the TDMA bursting rising curve. The invention is applied in the mobile communication field.
Description
Technical field
The present invention relates to a kind of transmit method of signal to noise ratio of portable terminal of improving, relate in particular to the transmit method of signal to noise ratio of a kind of TD-SCDMA of improvement terminal.
Background technology
TD-SCDMA is the system of a strict power control, and the purpose of system's closed power control is to make the transmitting of all terminals in the whole sub-district arrive the desired value that the later signal to noise ratio in base station equals the desirable signal to noise ratio in base station.When the signal to noise ratio of the arrival signal of base station that a certain terminal is launched in the base station detects the sub-district is bigger than normal, the base station can send the transmitting power downward modulation that the TPC command word requires terminal to terminal, and the signal to noise ratio that transmits when terminal is when less than normal, and the base station can require the transmitting power of terminal to raise.
The basis of obvious whole closed-loop power control is the signal-to-noise target value that the base station sets.Transmitting of antenna for mobile phone transmitting terminal itself just has certain signal to noise ratio, and it will pass through the transmission of space channel before arriving the base station, and space transmission channel can be introduced certain interference and noise, just can worsen the signal to noise ratio that the antenna for mobile phone end transmits.The signal to noise ratio that transmits itself of supposing the antenna for mobile phone end is less than or equal to the desired value of the signal to noise ratio that the base station sets, so the base station how command terminal adjust the requirement that transmitting power all can not satisfy signal-to-noise target value, finally cause whole closed-loop power control failure.Especially when the high-power emission of power amplifier of terminal, can cause the signal to noise ratio that transmits of antenna end relatively poor relatively this moment, this just requires the power amplifier parameter is adjusted, and makes under the situation of high-power emission the signal to noise ratio that transmits that improves antenna end.
Transmitting of TD-SCMDA is a TDMA burst (burst).The process that each burst all has a power to rise and descend in time, just power amplifier is from being opened to maximum power transmission again to the process of cutting out, and the process of this rising and decline just is called the RAMP curve.Because the bandwidth of TD-SCMDA is 1.6MHz, so the maximum interference that the RAMP curve produces is in this channel strip of TD-SCDMA, there is not the problem that strengthens adjacent-channel interference, so the power amplifier of TD-SCDMA terminal is not all adjusted the RAMP curve at present, that is to say that transmitting power directly rises to maximum from minimum.But the interference signal objective reality that the RAMP curve produces and dropping in this channel strip of TD-SCDMA, thereby just reduced the signal to noise ratio that transmits of antenna end.
Requirement according to agreement 3GPP TS 25.102, each TDMA burst (burst) that TD-SCDMA transmits must be satisfied template requirement as shown in Figure 1, just each TDMA burst ascending curve must be stuck within transmitting power template switching time of 3GPP TS 25.102 defineds, TDMA burst decline curve and ascending curve are similar, are the mirror image of ascending curve.Because the power amplifier of TD-SCDMA terminal is not adjusted TDMA burst ascending curve at present, this curve is rectangular rising in template, also be that the 0 μ s minimum of transmitting power from Fig. 1 directly rises to maximum, this will locate to produce as shown in Figure 2 larger interference at distance center frequency point 400kHz, 600kHz etc.These interference are in the band, have reduced the signal to noise ratio that transmits of antenna end.
Summary of the invention
The objective of the invention is to address the above problem the method that provides a kind of TD-SCDMA of improvement terminal to transmit signal to noise ratio, the signal to noise ratio that transmits of raising antenna end.
Technical scheme of the present invention is: the present invention has disclosed the transmit method of signal to noise ratio of a kind of TD-SCDMA of improvement terminal, comprising:
(1) the TDMA burst ascending curve of acquisition terminal power amplifier and TDMA burst decline curve;
(2) within transmitting power template switching time, this TDMA burst ascending curve is done level and smooth adjustment, make the transmitting power of this terminal power amplifier slowly rise to maximum from minimum;
(3) the TDMA burst decline curve of this terminal power amplifier is done mirror image processing according to this TDMA burst ascending curve.
Above-mentioned the transmit method of signal to noise ratio of TD-SCDMA terminal of improving, wherein, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into 1/4 cycle sinusoidal curve.
Above-mentioned the transmit method of signal to noise ratio of TD-SCDMA terminal of improving, wherein, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into the 1/4 cycle cosine curve that roll-offs.
Above-mentioned the transmit method of signal to noise ratio of TD-SCDMA terminal of improving, wherein, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into Gaussian curve.
Above-mentioned the transmit method of signal to noise ratio of TD-SCDMA terminal of improving, wherein, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into 1/2 cycle cosine curve, its mathematic(al) representation is:
0≤x≤1.
The present invention contrasts prior art following beneficial effect: thus method of the present invention is not adjusted this present situation that RAM P curve has reduced the signal to noise ratio that transmits of antenna end at TD-SCDMA, TDMA burst ascending curve and decline curve (alleged RAMP curve just) to the terminal power amplifier are smoothly adjusted, make the transmitting power of terminal power amplifier slowly rise to maximum from minimum, thereby improved the signal to noise ratio that the TD-SCDMA terminal transmits, improved the probalility of success of uplink synchronous.
Description of drawings
Fig. 1 is the schematic diagram of transmitting power template switching time of standard in the 3GPP agreement.
The schematic diagram that disturbs in this channel strip that Fig. 2 produces when being rectangular rising of existing TDMA burst ascending curve.
Fig. 3 is the transmit flow chart of embodiment of method of signal to noise ratio of the TD-SCDMA of improvement terminal of the present invention.
Fig. 4 is the schematic diagram of adjusted TDMA burst ascending curve of the present invention.
Fig. 5 is the schematic diagram of adjusted TDMA burst decline curve of the present invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 3 shows the transmit flow process of embodiment of method of signal to noise ratio of the TD-SCDMA of improvement terminal of the present invention.See also Fig. 3, each step in the method for present embodiment is described in detail below in conjunction with Fig. 3.
Step S30: the TDMA burst ascending curve and the TDMA burst decline curve that obtain the terminal power amplifier.
Step S32: within transmitting power template switching time of 3GPP TS 25.102 agreement defineds, TDMA burst ascending curve is done level and smooth adjustment, make the transmitting power of terminal power amplifier slowly rise to maximum from minimum.
The level and smooth adjustment is in order to reduce the interference in the passband that is brought by TDMA burst ascending curve, to avoid the transmitting power of power amplifier directly to rise to maximum from minimum.Level and smooth adjusted curve can be 1/4 cycle sinusoidal curve, 1/2 cycle cosine curve, roll-off cosine curve or Gaussian curve, for example is exactly 1/2 cycle cosine ascending curve in Fig. 4.Wherein the effect of 1/2 cycle cosine curve is best, and its mathematic(al) representation is:
0≤x≤1.Comparison diagram 1 and Fig. 4, by emulation, the interior interference power of entire belt has reduced 3dB with respect to the situation that rectangle rises after adjusting TDMA burst ascending curve, that is to say that the signal to noise ratio that transmits of antenna end has improved 3dB, has successfully improved the signal to noise ratio that the TD-SCDMA terminal transmits.
Step S34: the TDMA burst decline curve to the terminal power amplifier is done mirror image processing according to TDMA burst ascending curve.TDMA burst decline curve as shown in Figure 5.
Because mirror image processing is a kind of processing means commonly used, no longer the concrete processing procedure of TDMA burst decline curve is further described at this.
The foregoing description provides to those of ordinary skills and realizes or use of the present invention; those of ordinary skills can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (5)
1. one kind is improved the transmit method of signal to noise ratio of TD-SCDMA terminal, comprising:
(1) the TDMA burst ascending curve of acquisition terminal power amplifier and TDMA burst decline curve;
(2) within transmitting power template switching time, this TDMA burst ascending curve is done level and smooth adjustment, make the transmitting power of this terminal power amplifier slowly rise to maximum from minimum;
(3) the TDMA burst decline curve of this terminal power amplifier is done mirror image processing according to this TDMA burst ascending curve.
2. the transmit method of signal to noise ratio of the TD-SCDMA of improvement terminal according to claim 1 is characterized in that, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into 1/4 cycle sinusoidal curve.
3. the transmit method of signal to noise ratio of the TD-SCDMA of improvement terminal according to claim 1 is characterized in that, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into the 1/4 cycle cosine curve that roll-offs.
4. the transmit method of signal to noise ratio of the TD-SCDMA of improvement terminal according to claim 1 is characterized in that, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into Gaussian curve.
5. the transmit method of signal to noise ratio of the TD-SCDMA of improvement terminal according to claim 1 is characterized in that, the level and smooth adjustment in the step (2) is that the TDMA ascending curve that happens suddenly is adjusted into 1/2 cycle cosine curve, and its mathematic(al) representation is:
0≤x≤1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046248A CN101808394A (en) | 2009-02-17 | 2009-02-17 | Method for improving signal-to-noise ratio of TD-SCDMA terminal transmission signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046248A CN101808394A (en) | 2009-02-17 | 2009-02-17 | Method for improving signal-to-noise ratio of TD-SCDMA terminal transmission signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101808394A true CN101808394A (en) | 2010-08-18 |
Family
ID=42609954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910046248A Pending CN101808394A (en) | 2009-02-17 | 2009-02-17 | Method for improving signal-to-noise ratio of TD-SCDMA terminal transmission signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101808394A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404057A (en) * | 2011-07-08 | 2012-04-04 | 展讯通信（上海）有限公司 | Method for increasing radiation performance of radio-frequency emission part of Global System for Mobile Communications (GSM) terminal |
| CN106159907A (en) * | 2015-04-14 | 2016-11-23 | 北京北广科技股份有限公司 | A kind of over-current protection method of high-power transmitter |
-
2009
- 2009-02-17 CN CN200910046248A patent/CN101808394A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404057A (en) * | 2011-07-08 | 2012-04-04 | 展讯通信（上海）有限公司 | Method for increasing radiation performance of radio-frequency emission part of Global System for Mobile Communications (GSM) terminal |
| CN102404057B (en) * | 2011-07-08 | 2013-10-02 | 展讯通信（上海）有限公司 | Method for increasing radiation performance of radio-frequency emission part of Global System for Mobile Communications (GSM) terminal |
| CN106159907A (en) * | 2015-04-14 | 2016-11-23 | 北京北广科技股份有限公司 | A kind of over-current protection method of high-power transmitter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2544494A3 (en) | Method and apparatus for mitigating downlink control channel interference | |
| WO2011052965A3 (en) | Dynamic uplink power control method and device in a wireless communications system | |
| EP1966907B1 (en) | Transmit power control in a radio station | |
| WO2013185672A1 (en) | Uplink power control method, terminal and base station | |
| AU2011349036A8 (en) | RACH procedures and power level for MTC devices | |
| EP1940045A3 (en) | Radio communications system and control method therefor | |
| EP2301285B2 (en) | Method and arrangement in a cellular communications system | |
| CN108288992B (en) | Method and device for automatically controlling gain of micro repeater and baseband chip | |
| CN102781086B (en) | The Poewr control method and device of a kind of RACH | |
| CN101808394A (en) | Method for improving signal-to-noise ratio of TD-SCDMA terminal transmission signal | |
| EP1965532A3 (en) | Apparatus and method for determining an uplink transmission format in a broadband wireless communication system | |
| CN102340858B (en) | Method and device for setting target SINR (Signal-to-Interference and Noise Ratio) in PUSCH (Physical Uplink Shared Channel) power control | |
| WO2004070957A3 (en) | Uplink transmission power control method | |
| CN101494894B (en) | Backward power control method and control device | |
| US20140171081A1 (en) | Systems and Methods for Power Control in Wireless Networks | |
| CN106559866B (en) | Automatic gain control method and system | |
| CN105323840B (en) | Power configuration method | |
| EP2648380A1 (en) | Communication device and communication method | |
| CN106603094B (en) | A kind of method and circuit of radio-frequency transmissions | |
| CN105307253B (en) | To the Poewr control method of high-power cluster terminal, system and device | |
| CN1780184B (en) | Channel analog instrument and method | |
| CN101489296B (en) | Uplink channel transmission power compensating method and apparatus | |
| EP2615741A1 (en) | Wireless communication apparatus, baseband processing apparatus, radio apparatus and communication control method | |
| CN101965041B (en) | Adjustment method and device of TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) receive automatic gain control | |
| CN106160685B (en) | Method and device for adjusting automatic gain control step length |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20100818 |