CN101355371B - Mobile terminal and method for receiving data thereof - Google Patents
Mobile terminal and method for receiving data thereof Download PDFInfo
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- CN101355371B CN101355371B CN2008102226026A CN200810222602A CN101355371B CN 101355371 B CN101355371 B CN 101355371B CN 2008102226026 A CN2008102226026 A CN 2008102226026A CN 200810222602 A CN200810222602 A CN 200810222602A CN 101355371 B CN101355371 B CN 101355371B
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Abstract
The invention provides a mobile terminal and a method thereof for receiving data. The mobile terminal comprises an antenna, a radio frequency receiver, a digital base band and a control unit, wherein the digital base band comprises a pumping filter, a compensation filter, a root raised cosine filter and a demodulator which are connected in sequence, wherein the compensation filter is a non-symmetrical filter; and the control unit is used for turning on a data receiving switch of the digital base band before the antenna switch is turned on; and after the compensation filter is filled with noise, the data receiving switch and the antenna switch of the root raised cosine filter are turned on. The mobile terminal and the method thereof for receiving the data can effectively overcome the distortion of initially-received data caused by the asymmetry after the compensation filter is adopted, thereby improving the quality for receiving the data.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of portable terminal and data receive method thereof.
Background technology
Along with business-like the closing on of TD SDMA (TD-SCDMA) system, subscriber terminal equipment is considered to the bottleneck of industrialization as one of the key link all the time owing to reasons such as starting late of design and development.Commercial at present RF transceiver framework mostly adopts analog interface, though the analog interface technology is very ripe, owing to there are shortcomings such as very flexible, cost height, more and more can not satisfy the needs of design.
Along with the development of digital processing technology with popularize, can satisfy the demand of broadband high-speed data service with lower cost based on the RF transceiver framework of digital interface.Digitized processing makes that the radio-frequency front-end design is more flexible, and can realize higher performance, and digital interface has been represented the developing direction of following RF transceiver framework.
In digital RF,, often adopt asymmetric filters to compensate filtering in order to obtain better receptivity.In realizing process of the present invention, the inventor finds, adopt asymmetrical reception compensating filter after because its asymmetry characteristic can cause initial reception data distortion (with reference to Fig. 1) usually, thereby influence receives the quality of data.
Summary of the invention
Technical problem to be solved by this invention provides a kind of portable terminal and data receive method thereof, after overcoming employing reception compensating filter, since the initial reception data distortion that its asymmetry causes, the quality of raising reception data.
For addressing the above problem, the present invention provides technical scheme following:
A kind of portable terminal comprises antenna, radio-frequency transmitter, digital baseband and control unit, comprises the decimation filter, compensating filter, root raised cosine filter and the demodulator that are linked in sequence in the said digital baseband, wherein:
Said compensating filter is an asymmetric filters;
Said control unit is used for counting switch opening the receipts of opening digital baseband before the duplexer, fill compensating filter with noise after, open the receipts of root raised cosine filter again and count switch and duplexer.
Above-mentioned portable terminal, wherein, said compensating filter is asymmetrical finite impulse response filter.
Above-mentioned portable terminal, wherein, said decimation filter is the two-stage cic filter.
Above-mentioned portable terminal, wherein, said use noise is filled compensating filter and is: be full of compensating filter with noise, perhaps, partly be full of compensating filter with noise.
A kind of data receive method of portable terminal; Said portable terminal comprises antenna, radio-frequency transmitter, digital baseband and control unit; Comprise the decimation filter, compensating filter, root raised cosine filter and the demodulator that are linked in sequence in the said digital baseband; Wherein, said compensating filter is an asymmetric filters, and said method comprises:
Before opening duplexer, open the receipts of digital baseband and count switch, behind noise filling compensating filter, open the receipts of root raised cosine filter again and count switch and duplexer.
The present invention counts switch through the receipts of digital baseband chip being received number switch and root raised cosine filter and splits into two signals; When control timing designs; Open earlier the receipts of digital baseband chip in advance and count switch; The noise of eating dishes without rice or wine with receiving this moment is filled the reception compensating filter, and then opens root raised cosine filter and receive the number switch, thereby effectively overcomes because the initial reception data distortion that the asymmetry of compensating filter causes; Improved the quality that receives data, make receive compensating filter can better application in the mobile communication terminal.
Description of drawings
Fig. 1 receives the reception data time-domain diagram behind the compensating filter for available technology adopting;
Fig. 2 is the structural representation of the portable terminal of the embodiment of the invention;
Fig. 3 is the frequency response sketch map of the compensating filter among Fig. 2;
Fig. 4 is the global state machine sketch map in the embodiment of the invention;
Fig. 5 is the Data Receiving control timing figure in the embodiment of the invention;
Fig. 6 is the reception data time-domain diagram behind the employing reception compensating filter in the embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing and specific embodiment to describe the present invention below.
With reference to Fig. 2, the portable terminal of the embodiment of the invention mainly comprises: antenna, radio-frequency transmitter, digital baseband comprise the decimation filter, compensating filter, root raised cosine filter (RRC) and the demodulator that are linked in sequence in the said digital baseband.Also comprise control unit (figure does not show) in the said portable terminal, be used to carry out SECO, specifically be used for controlling the time that each module of portable terminal opens and closes.
Wherein, said compensating filter is an asymmetric filters.In the present embodiment, said compensating filter is the asymmetrical finite impulse response filters in 8 rank (FIR), is used for the performance loss of signal in the passband is compensated, and improves the reception quality of signals with this; Said decimation filter is the two-stage cic filter, and cic filter is a cascade integral comb filter.
Radio-frequency transmitter carries out analog-to-digital conversion to the radiofrequency signal that antenna receives, and the digital signal that analog-to-digital conversion is obtained outputs to digital baseband through digital interface; Said digital signal is earlier through the CIC decimation filter, and then through compensating filter, process RRC filter outputs to memory cell at last, and by demodulator the data of storing in the memory cell is carried out demodulation.
In the middle of the application of time division duplex (TDD), in order better to reduce chip power-consumption, also be the requirement of frame structure simultaneously, require to realize accurate switch that the time spent is opened path, closes path when idle to receiving path.But, owing to adopted asymmetrical finite impulse response filter, thus the particularity of the non-linear of phase place and filter initial value brought.
Fig. 3 is the frequency response sketch map of compensating filter.With reference to Fig. 3; Each switch has all carried out an initialization to this filter; Like this, if in practical application, do not consider the particularity of filter initial value, can be when small-signal receives; Demodulate an initialize signal (with reference to Fig. 1) that has the high peak pulse, this high peak pulse meeting brings very big influence to the processing of back level filter.
Being head it off, is that digital baseband chip provides special control signal through control unit in the embodiment of the invention, and this high peak pulse signal is eliminated.Particularly; Said control unit; Before opening duplexer, open the receipts of digital baseband and count switch; Behind noise filling compensating filter, open the receipts of root raised cosine filter again and count switch and duplexer, thereby the output signal that has guaranteed compensating filter is the useful signal that does not have the high peak data to root raised cosine filter.
In order to realize being complementary with radio frequency control; The inner reception path of the digital baseband chip of the embodiment of the invention has been done following design: the filter of each grade all has the proprietary control signal of oneself; These control signals are controlled by a global state machine; According to the different filter time-delay, produce fixing control signal; But adopt the extra control signal of adding in the compensating filter one-level, give birth to cosine filter by the root that control unit comes the dateout of control compensation filter whether need be sent to next stage really.
The global state machine is as shown in Figure 4, and the workflow of said global state machine is: when initialization, state machine is in state 0; After the reception path signal was opened, state jumped to state 1, is the data recovery process of the baseband chip inside first step; In data sync after this locality; 2,3 of states are the operating states of back two-stage cic filter, and condition 1 is to satisfy data sync time of delay, and when decision jumps to state 2; Condition 2 is first order decimation filter time of delay, and decision jumps to the time of state 3; After the time of delay of satisfying second level decimation filter, state machine enters into state 4, the operating state of compensating filter; According to compensating filter time of delay condition and the independent control signal decision condition that enables whether enter into state 5, this step is a key component of avoiding occurring spiking data; Final data enters into state 5, and root is given birth to the cosine filter operating state; When receiving path blockade, state is got back to initial state.
Can see that in state 4, whole reception path is in compensating filter and starts working the stage.Decide current state whether need jump to next operating state through a proprietary control signal this moment, and just root is given birth to the cosine filter state of starting working.This proprietary control signal is configurable by control unit, and the processing through certain is reacted to this control signal on the chip internal control logic.Effectively and under the condition that satisfies of compensating filter constant time lag, state can jump to next operating state in this proprietary control signal.If wherein arbitrary condition does not satisfy, and is so just constant in current state.Just the dateout of compensating filter is not sent in the living cosine filter of root, till condition changes always.
Control unit can also determine the length that noise charges into, and can all be full of compensating filter, also can partly be full of compensating filter, so, when eliminating the high peak pulse that receives the data incipient stage, has realized the flexibility of design control.Fig. 6 is the reception data time-domain diagram behind the employing reception compensating filter in the embodiment of the invention, can find out that receiving data has not had the data distortion foremost.
Below provide a kind of control timing of the Data Receiving of the embodiment of the invention, it is produced by said control unit.
With reference to Fig. 5, the tentation data time of reception be T (1/8chip of unit, 1chip=781.25ns), n1>n2>n3 n4 n5 n6 n7, the design of sequential comprises the following steps:
Step 1:T-n1 draws high radio-frequency transmitter SYNTHON pin (master switch);
Step 2:T-n2 writes radio-frequency transmitter frequency register through SPI three buses and carries out frequency locking;
Step 3:T-n3 draws high radio-frequency transmitter RXON pin (low-converter switch), enables low-converter wherein;
Step 4:T-n4 enables the radio-frequency transmitter gain controlling, and receiver gain is set;
Step 5:T-n5 opens the reception data switch of digital baseband chip, and the noise of two chip is full of compensating filter with these two noise spots in advance.
Step 6:T-n6 opens the receipts of the living cosine filter of root and counts switch;
Step 7:T-n7 opens duplexer.
In sum, the effective customer service of adjustment of the present invention design through chip and sequential in portable terminal adopt the front end that causes behind the asymmetry compensation filter to receive the distortion of data, thereby guarantee the performance of downlink data.Aspect chip and SECO, almost do not increase new expense simultaneously, avoided the increase of terminal system complexity.
Should be noted that at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Those of ordinary skill in the art is to be understood that; Can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (8)
1. a portable terminal comprises antenna, radio-frequency transmitter, digital baseband and control unit, comprises the decimation filter, compensating filter, root raised cosine filter and the demodulator that are linked in sequence in the said digital baseband, it is characterized in that:
Said compensating filter is an asymmetric filters;
Said control unit is used for counting switch opening the receipts of opening digital baseband before the duplexer, fill compensating filter with noise after, open the receipts of root raised cosine filter again and count switch and duplexer.
2. portable terminal as claimed in claim 1 is characterized in that:
Said compensating filter is asymmetrical finite impulse response filter.
3. portable terminal as claimed in claim 1 is characterized in that:
Said decimation filter is the two-stage cic filter.
4. portable terminal as claimed in claim 1 is characterized in that:
Said use noise is filled compensating filter: be full of compensating filter with noise, perhaps, partly be full of compensating filter with noise.
5. the data receive method of a portable terminal; Said portable terminal comprises antenna, radio-frequency transmitter, digital baseband and control unit; Comprise the decimation filter, compensating filter, root raised cosine filter and the demodulator that are linked in sequence in the said digital baseband; It is characterized in that said compensating filter is an asymmetric filters, said method comprises:
Before opening duplexer, open the receipts of digital baseband and count switch, behind noise filling compensating filter, open the receipts of root raised cosine filter again and count switch and duplexer.
6. method as claimed in claim 5 is characterized in that:
Said compensating filter is asymmetrical finite impulse response filter.
7. method as claimed in claim 5 is characterized in that:
Said decimation filter is the two-stage cic filter.
8. method as claimed in claim 5 is characterized in that:
Said use noise is filled compensating filter: be full of compensating filter with noise, perhaps, partly be full of compensating filter with noise.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008102226026A CN101355371B (en) | 2008-09-18 | 2008-09-18 | Mobile terminal and method for receiving data thereof |
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| CN2008102226026A CN101355371B (en) | 2008-09-18 | 2008-09-18 | Mobile terminal and method for receiving data thereof |
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| CN101355371A CN101355371A (en) | 2009-01-28 |
| CN101355371B true CN101355371B (en) | 2012-03-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175335A (en) * | 1994-12-19 | 1998-03-04 | 萨尔布研究及发展私人有限公司 | Multi-hop packet radio networks |
| US6879732B1 (en) * | 2000-10-06 | 2005-04-12 | Xcounter Ab | Noise reduction in images |
| CN101162933A (en) * | 2007-11-14 | 2008-04-16 | 北京天碁科技有限公司 | TD-SCDMA terminal to support receiving diversity |
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2008
- 2008-09-18 CN CN2008102226026A patent/CN101355371B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1175335A (en) * | 1994-12-19 | 1998-03-04 | 萨尔布研究及发展私人有限公司 | Multi-hop packet radio networks |
| US6879732B1 (en) * | 2000-10-06 | 2005-04-12 | Xcounter Ab | Noise reduction in images |
| CN101162933A (en) * | 2007-11-14 | 2008-04-16 | 北京天碁科技有限公司 | TD-SCDMA terminal to support receiving diversity |
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| CN101355371A (en) | 2009-01-28 |
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