CN101959288B - Automatic gain control regulating method for received signals and signal receiving equipment - Google Patents

Abstract

The invention relates to a signal receiving technology, and discloses an automatic gain control regulating method for received signals and signal receiving equipment. In the method, DwPTS is used as guidance, if the RSSI change of the DwPTS is more than a threshold, the AGC gain value of the corresponding time slot of a current sub-frame is regulated according to the RSSI change value of the DwPTS, a signal of the corresponding time slot in the current sub-frame is received by the regulated AGC gain value; and if the RSSI change of the DwPTS is less than or equal to the threshold, the signal of the corresponding time slot is received directly by the AGC gain value of the corresponding time slot the time slot in the current sub-frame which is calculated by the AGC gain value of the last sub-frame. Therefore, the method can deal with the situation of great signal change, meet the requirement of signal mutation, and improve the accuracy of subsequent signal processing.

Description

Receive automatic gain control method of adjustment and the signal receiver of signal

Technical field

The present invention relates to the signal reception technique, particularly receive the automatic gain control adjustment technology of signal.

Background technology

Automatic gain control (Automatic Gain Control is called for short " AGC ") is very important strategy of receiving equipment, and its essential purpose is exactly the signal of receiving equipment front end to be carried out the adjustment of scope, when signal is strong, makes its Gain Automatic reduction; When signal is more weak, makes its Gain Automatic increasing again, thereby guaranteed the uniformity of strong and weak signals.Make receiving equipment avoid receiving signal gets too small or supersaturation, the follow-up signal that influences receiving equipment is handled.As 20dB, general A GC can catch up with the variation of signal amplitude in the normal fluctuation range of signal, can not handle producing bigger influence to follow-up signal.Can participate in the patent No. about the AGC technology of accepting device and be the United States Patent (USP) of " 5267272 ".

Yet, the present inventor finds, at TD SDMA (Time DivisionSynchronous Code Division Multiple Access, abbreviation " TD-SCDMA ") in the terminal receiving equipment, can run into the attenuation significantly that receives signal, as when passing in and out elevator, signal can be subjected to bigger variation suddenly.In the variation of signal big (such as excursion in 40dB), the gain of AGC can't in time be caught up with, and causes reception signal gets too small or the supersaturation of AGC, will have a strong impact on follow-up signal and handle.

In addition, in the terminal receiving equipment of TD-SCDMA, also may run into discontinuous emission (Discontinuous Transmission is called for short " DTX ") situation.Under the DTX situation,, but handle the gain value of the AGC that to raise (being yield value) if can not judge the DTX situation timely according to normal signal.Because the gain value of AGC raises always, after the DTX end, in the time of the desired signal reception, it is saturated that AGC gain value bigger than normal will cause receiving signal.Under Ideal (ideal) pattern, Page Indication Channel (Page Indicator Channel is called for short " PICH ") is particularly evident down.

At present, the patent relevant with AGC that retrieve of inventor (as application number be 03141863.5,03149787.X, 03134820.3,200410042676.3,200410101826.3 and 200510027892.5 etc. patent application) or technical data in do not relate to the scheme that solves the problems of the technologies described above.

Summary of the invention

The object of the present invention is to provide a kind of automatic gain control method of adjustment and signal receiver that receives signal, can tackle the situation that signal changes significantly, satisfy the needs of sign mutation, improve the accuracy that follow-up signal is handled.

For solving the problems of the technologies described above, embodiments of the present invention provide a kind of automatic gain control method of adjustment that receives signal, comprise following steps:

According to the yield value of the automatic gain of last subframe control AGC, calculate the yield value of AGC of the corresponding time slot of current subframe, wherein, time slot comprises descending pilot frequency time slot;

Yield value according to the descending pilot frequency time slot of the current subframe of calculating receives the down-bound pilot frequency signal in the current subframe, and calculates the reception signal strength signal intensity indication RSSI of the descending pilot frequency time slot of current subframe;

If the difference of the RSSI of the descending pilot frequency time slot in the RSSI of the descending pilot frequency time slot in the current subframe and the last subframe, greater than default thresholding, then adjust the yield value of AGC of the corresponding time slot of current subframe, receive the signal of corresponding time slot with the yield value of the AGC after adjusting; If difference is less than or equal to default thresholding, then directly receive the signal of corresponding time slot with the yield value of the AGC that calculates.

Embodiments of the present invention also provide a kind of signal receiver, comprise:

The gain value computation module of automatic gain control AGC is used for the yield value according to the AGC of a last subframe, calculates the yield value of AGC of the corresponding time slot of current subframe, and wherein, time slot comprises descending pilot frequency time slot;

Receiver module is used for the yield value according to the descending pilot frequency time slot of the current subframe of calculating, and receives the down-bound pilot frequency signal in the current subframe;

Receive signal strength signal intensity indication RSSI computing module, be used for the down-bound pilot frequency signal according to the current subframe of receiver module reception, the yield value of the descending pilot frequency time slot of the current subframe of calculating with the gain value computation module of AGC calculates the RSSI of the descending pilot frequency time slot of current subframe;

First judge module be used for to be judged the difference of the RSSI of the RSSI of descending pilot frequency time slot of current subframe and the descending pilot frequency time slot in the last subframe, whether greater than default thresholding;

Adjusting module is used for when first judge module is judged greater than default thresholding, adjust the yield value of AGC of the corresponding time slot of current subframe, and the indication receiver module receives the signal of corresponding time slot with the yield value of the AGC after adjusting;

If first judge module judges difference and be less than or equal to default thresholding, then first judge module indication receiver module directly receives the signal of corresponding time slot with the yield value of the AGC that calculates.

Embodiment of the present invention compared with prior art, the main distinction and effect thereof are:

Utilize descending pilot frequency time slot (Downlink Pilot Time Slot, be called for short " DwPTS ") as guide, if the reception signal strength of DwPTS indication (Receiving Signal StrengthIndicator, be called for short " RSSI ") change greater than thresholding, then adjust the yield value of AGC of the corresponding time slot of current subframe according to the RSSI changing value of DwPTS, receive the signal of corresponding time slot in the current subframe with the yield value of the AGC after adjusting; Be less than or equal to thresholding if the RSSI of DwPTS changes, the yield value of the AGC of the corresponding time slot of the current subframe that directly calculates with the yield value according to the AGC of a last subframe then receives the signal of corresponding time slot.Because in actual conditions, signal can be subjected to bigger variation (as turnover elevator etc.) suddenly, if still only an above subframe time slot corresponding as a reference, the gain of AGC can't in time be caught up with, cause reception signal gets too small or the supersaturation of AGC, have a strong impact on follow-up signal and handle.Therefore, the present invention is by following the tracks of the variation of DwPTS, RSSI amplitude of variation with DwPTS embodies the variation significantly that signal whether occurs, when the variation significantly that signal occurs, yield value to AGC is adjusted, thereby can tackle the situation that signal changes significantly, satisfy the needs of sign mutation, improve the accuracy that follow-up signal is handled.

Further, when adjusting the yield value of AGC of corresponding time slot of current subframe, yield value with the AGC of the corresponding time slot of a last subframe, add the difference of the RSSI of the RSSI of the descending pilot frequency time slot in the current subframe and the descending pilot frequency time slot in the last subframe, the yield value of the AGC of the corresponding time slot of the current subframe after obtaining adjusting.Because the RSSI of DwPTS changes the changes in amplitude that can embody signal, therefore the difference that changes with the RSSI of DwPTS is reference, adjusts the yield value of AGC, can improve the accuracy of the yield value that obtains at last, thereby has guaranteed that follow-up signal handles.

Further, receive the signal of corresponding time slot of current subframe at the yield value with AGC after, need judge also whether the signal of each time slot of current subframe is zero-signal;

To being judged to be the time slot of zero-signal, with the yield value of the AGC of this time slot in current subframe, as the yield value of the AGC of corresponding time slot in next subframe.Because in the terminal receiver of TD-SCDMA, can run into the DTX situation that receives signal, if the signal under the DTX situation is still handled as normal signal, the yield value of AGC will raise, and the rising always of AGC can cause after DTX finishes, when desired signal received, it is saturated that the yield value of AGC bigger than normal causes receiving signal, so that have a strong impact on the detection performance.Therefore, by the judgement to zero-signal (being the signal under the DTX situation), when being judged to be zero-signal, keep the yield value of AGC constant, avoided always raising so that influence detects the situation of performance of AGC.

Description of drawings

Fig. 1 is the automatic gain control method of adjustment flow chart according to the reception signal of first embodiment of the invention;

Fig. 2 is the structural representation according to the TD-SCDMA subframe in the first embodiment of the invention;

Fig. 3 is according to the subframe structure of time slot schematic diagram in the first embodiment of the invention;

Fig. 4 is the automatic gain control method of adjustment flow chart according to the reception signal of second embodiment of the invention;

Fig. 5 is the structural representation according to the signal receiver of second embodiment of the invention.

Embodiment

In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on many variations and the modification of following each execution mode, also can realize each claim of the application technical scheme required for protection.

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing embodiments of the present invention are described in further detail.

First embodiment of the invention relates to a kind of automatic gain control method of adjustment that receives signal.Idiographic flow as shown in Figure 1.

In step 101, receiving equipment is by cell initial search, obtains the yield value (and the descending time slot of supposing this i subframe correspondence is non-zero signal) of AGC of each time slot of certain i subframe.Specifically, in TD-SCDMA system mobile communication, its subframe structure includes TS (time slot) 0 as shown in Figure 2, DwPTS, and GP (protection time slot), UpPTS, TS1～TS6, its structure of time slot is as shown in Figure 3.Because even if not necessarily there is or exists also not necessarily reception in TS0, so present embodiment only considers DwPTS and descending other time slots in the subframe, and at this, with Ts4, Ts5, Ts6 are example, and the yield value of the AGC of the corresponding time slot of i subframe is expressed as G _{I, dwpts},

Then, enter step 102, according to the yield value of the AGC of a last subframe, calculate the yield value of AGC of the corresponding time slot of current subframe.Wherein, a last subframe is i subframe, and current subframe is i+1 subframe.

Specifically, calculate the RSSI (for DwPTS, then only calculating the average power of 64 chip of DwPTS) of each time slot in the subframe, (RSSI Ts6) is expressed as each time slot: P for DwPTS and Ts4, Ts5 _Dwpts ⁱ, The RSSI of each time slot can obtain by following formula:

$P_{\mathrm{dwpts}}^i=\frac{1}{64}\underset{k=1}{\overset{64}{\mathrm{\Σ}}}{\left|d_{\mathrm{twpts},k}\right|}^2-G_{i,\mathrm{dwpts}}$

$P_{{\mathrm{ts}}_n}^i=\frac{1}{864}\underset{k=1}{\overset{864}{\mathrm{\Σ}}}{\left|d_{n,k}\right|}^2-G_{i,t{s}_n},n=\mathrm{4,5,6}$

Wherein, d _{Twpts, k}K data among the expression DwPTS, d _{N, k}Represent k data in n the time slot.

Then, the difference by desired value and RSSI determines G ' _{I+1, dwpts},

Wherein, G ' _{I+1, dwpts},

Represent DwPTS and Ts4 in the current subframe, Ts5, the yield value of the predetermined AGC of Ts6, desired value is predefined value.

Then, by following formula to G ' _{I+1, dwpts}, G ' _{I+1, ts4}, G ' _{I+1, ts5}, G ' _{I+1, ts6}After carrying out smoothing processing, obtain the yield value of the AGC of the corresponding time slot of current subframe: G _{I+1, dwpts}, G _{I+1, ts4}, G _{I+1, ts5}, G _{I+1, ts6}

G _i+1，dwpts＝G _i，dwpts+λ(G′ _i+1，dwpts-G _i，dwpts)

$G_{i+1,{\mathrm{ts}}_n}=G_{i,t{s}_n}+\mathrm{\λ}({G^{\′}}_{i+1,{\mathrm{ts}}_n}-G_{i,t{s}_n}),n=\mathrm{4,5,6}$

Wherein, other also can be got less than 1, the decimal greater than 0 in λ=1/8.

Need to prove, in this step according to the yield value of the AGC of a last subframe, the method of yield value of AGC of calculating the corresponding time slot of current subframe is the example of a specific implementation, in actual applications, also can be by other variety of ways according to the yield value of the AGC of a last subframe, calculate the yield value of AGC of the corresponding time slot of current subframe.

In step 103, with the G that obtains _{I+1, dwpts}Value receives the signal of the DwPTS of current subframe (being i+1 subframe), and calculates the RSSI of the DwPTS of current subframe, i.e. P _Dwpts ^I+1Calculate P _Dwpts ^I+1Method and above-mentioned calculating P _Dwpts ⁱMethod similar, do not repeat them here.

Then, in step 104, whether the RSSI of the DwPTS of the current subframe that judgement is calculated is normal, that is to say, judges P _Dwpts ^I+1Whether be saturation power or flood the power of making an uproar the end of to.If (be P normally _Dwpts ^I+1The power of making an uproar for the unsaturation non-submersion end of to), then enter step 105, otherwise enter step 106.

In step 105, judge the difference of the RSSI of the RSSI of the DwPTS in the current subframe and the DwPTS in the last subframe, whether greater than default thresholding, namely judge | P _Dwpts ^I+1-P _Dwpts ⁱ| whether greater than Δ G _ThIf, $|P_{\mathrm{dwpts}}^{i+1}-P_{\mathrm{dwpts}}^i|>{\mathrm{\ΔG}}_{\mathrm{th}},$ Then the variation significantly of signal appears in explanation, enters step 107, if | P _Dwpts ^I+1-P _Dwpts ⁱ| be less than or equal to Δ G _Th, then enter step 108.

In step 107, because to change appearred significantly in signal, the difference that therefore needs to utilize the RSSI of DwPTS to change in this step is reference, adjusts the yield value of AGC.

Specifically, adjust the yield value of AGC of the corresponding time slot of current subframe in the following manner:

With the yield value of the AGC of the corresponding time slot of a last subframe, add the difference that the RSSI of DwPTS changes, the yield value of the AGC of the corresponding time slot of the current subframe after obtaining adjusting.That is to say, $G_{i+1,{\mathrm{ts}}_n}=G_{i,t{s}_n}+(P_{\mathrm{dwpts}}^{i+1}-P_{\mathrm{dwpts}}^i),n=\mathrm{4,5,6}.$ Receive the signal of corresponding time slot in the current subframe with the yield value of the AGC after adjusting.Because the RSSI of DwPTS changes the changes in amplitude that can embody signal, therefore the difference that changes with the RSSI of DwPTS is reference, adjusts the yield value of AGC, can improve the accuracy of the yield value that obtains at last, thereby has guaranteed that follow-up signal handles.

In addition, be appreciated that, in actual applications, when signal changes significantly, can also adopt other modes that the yield value of AGC is adjusted, such as, the difference of the RSSI of the RSSI of the descending pilot frequency time slot in the current subframe and the descending pilot frequency time slot in the last subframe is carried out certain conversion process, with the yield value of the AGC of the corresponding time slot of a last subframe, add the value after the conversion process, the yield value of the AGC of the corresponding time slot of the current subframe after obtaining adjusting.

In step 108, owing to significantly changing does not appear in signal, so direct G to calculate in the step 102 _{I+1, ts4}, G _{I+1, ts5}, G _{I+1, ts6}, receive the signal of corresponding descending time slot in the current subframe.

In step 106, namely judge when the RSSI of DwPTS of current subframe is undesired, judge further whether the RSSI of the DwPTS of current subframe is saturation power.If be saturation power, then enter step 109, yield value with the AGC of the corresponding time slot of a last subframe, deduct parameter preset (being assumed to 15) after adding the difference of RSSI of DwPTS, obtain the yield value of AGC of the corresponding time slot of current subframe, receive the signal of corresponding time slot with the yield value of the AGC that obtains.That is to say, with $G_{i+1,{\mathrm{ts}}_n}=G_{i,t{s}_n}+(P_{\mathrm{dwpts}}^{i+1}-P_{\mathrm{dwpts}}^i)-15,n=\mathrm{4,5,6},$ Receive the signal of corresponding time slot in the current subframe.

If judge that in step 106 RSSI of the DwPTS of current subframe is not saturation power, the RSSI that the DwPTS of current subframe then is described floods the power of making an uproar the end of to, enter step 110, yield value with the AGC of the corresponding time slot of a last subframe, add parameter preset (being assumed to 15) after adding the difference of RSSI of DwPTS, obtain the yield value of AGC of the corresponding time slot of current subframe.That is to say, with $G_{i+1,{\mathrm{ts}}_n}=G_{i,t{s}_n}+(P_{\mathrm{dwpts}}^{i+1}-P_{\mathrm{dwpts}}^i)+15,n=\mathrm{4,5,6},$ Receive the signal of corresponding time slot in the current subframe.

Behind completing steps 107,108,109 or 110, get back to step 102, continue to handle the signal reception of next frame, can be understood as i=i+1 this moment.

Be not difficult to find, in the present embodiment, utilize DwPTS as guide, if the RSSI of DwPTS changes greater than thresholding, then adjust the yield value of AGC of the corresponding time slot of current subframe according to the RSSI changing value of DwPTS, receive the signal of corresponding time slot in the current subframe with the yield value of the AGC after adjusting.Be less than or equal to thresholding if the RSSI of DwPTS changes, the yield value of the AGC of the corresponding time slot of the current subframe that directly calculates with the yield value according to the AGC of a last subframe then receives the signal of corresponding time slot.Because in actual conditions, signal can be subjected to bigger variation (as turnover elevator etc.) suddenly, if still only an above subframe time slot corresponding as a reference, the gain of AGC can't in time be caught up with, cause reception signal gets too small or the supersaturation of AGC, have a strong impact on follow-up signal and handle.Therefore, the present invention is by following the tracks of the variation of DwPTS, RSSI amplitude of variation with DwPTS embodies the variation significantly that signal whether occurs, when the variation significantly that signal occurs, yield value to AGC is adjusted, thereby can tackle the situation that signal changes significantly, satisfy the needs of sign mutation, improve the accuracy that follow-up signal is handled.

In addition, be appreciated that owing in a subframe, not necessarily receive even if TS0 not necessarily exists or exists also, but DwPTS necessarily exists.Therefore present embodiment is only considered DwPTS and other descending time slots when the yield value of the AGC that calculates time slot, and this paper is with Ts4, and Ts5, Ts6 are example.Also can calculate the yield value of the AGC of more time slots.

Second embodiment of the invention relates to a kind of automatic gain control method of adjustment that receives signal.Second execution mode improves on the basis of first execution mode, main improvements are: receive at the yield value with AGC (namely in completing steps 107,108,109 or 110 backs) behind the signal of corresponding time slot of current subframe, also need further judge whether the situation into DTX.

Specifically, as shown in Figure 4, step 401 is identical to step 110 to step 410 and step 101, does not repeat them here.

In step 411, judge whether the signal of each time slot of current subframe is zero-signal.That is to say that to through the descending time slot signal Ts4 of the yield value of AGC separately, Ts5, Ts6 do zero-signal and detect.Judge that whether this time slot is zero time slot, and do corresponding record.And according to judged result, calculate the yield value of the AGC of corresponding time slot in next subframe (i.e. i+2 subframe) in the corresponding way.

Specifically, if the signal in n time slot is zero-signal, then with the yield value of the AGC of this time slot in current subframe, as the yield value of the AGC of corresponding time slot in next subframe, keep the yield value of AGC of this time slot constant.If the signal in n time slot is non-zero signal, then still calculate the yield value of the AGC of corresponding time slot in next subframe with usual manner.That is to say that the account form of the AGC yield value of each time slot of next subframe (i.e. i+2 subframe) is:

G _i+2，dwpts＝G _i+1，dwpts+λ(G′ _i+2，dwpts-G _i+1，dwpts)

$G_{i+2,{\mathrm{ts}}_n}=G_{i+1,{\mathrm{ts}}_n}+\mathrm{\λ}({G^{\′}}_{i+2,{\mathrm{ts}}_n}-G_{i+1,{\mathrm{ts}}_n}),$ If (ts _nBe zero-signal, λ=0 then, otherwise λ=λ), n=4,5,6

Because in the terminal receiver of TD-SCDMA, can run into the DTX situation that receives signal, if the signal under the DTX situation is still handled as normal signal, the yield value of AGC will raise, and the rising always of AGC can cause after DTX finishes, when desired signal received, it is saturated that the yield value of AGC bigger than normal causes receiving signal, so that have a strong impact on the detection performance.Therefore, by the judgement to zero-signal (being the signal under the DTX situation), when being judged to be zero-signal, keep the yield value of AGC constant, avoided always raising so that influence detects the situation of performance of AGC.For the situation of non-zero signal, still adopt usual manner to calculate the yield value of the AGC of corresponding time slot in next subframe, to satisfy the needs of normal condition.

Behind completing steps 411, get back to step 403, continue to handle the signal reception of next frame.

This shows, present embodiment not only with the variation of DwPTS as guide.When the variation of DwPTS surpasses thresholding, with the variation of DwPTS as booster action, when the variation of DwPTS is in normal range (NR), more than a subframe time slot corresponding as a reference.And present embodiment has also been distinguished DTX situation and non-DTX situation, if DTX, then the AGC of corresponding time slot remains unchanged, if non-zero signal, then AGC adjusts accordingly.

Each method execution mode of the present invention all can be realized in modes such as software, hardware, firmwares.No matter the present invention be with software, hardware, or the firmware mode realize, instruction code can be stored in the memory of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, fixing or removable medium etc.).Equally, memory can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") etc.

Third embodiment of the invention relates to a kind of signal receiver.As shown in Figure 5, this signal receiver comprises:

The gain value computation module of AGC is used for the yield value according to the AGC of a last subframe, calculates the yield value of AGC of the corresponding time slot of current subframe, and wherein, time slot comprises descending pilot frequency time slot.

Receiver module is used for the yield value according to the descending pilot frequency time slot of the current subframe of calculating, and receives the down-bound pilot frequency signal in the current subframe.

The RSSI computing module is used for the down-bound pilot frequency signal of the current subframe that receives according to receiver module, and the yield value of the descending pilot frequency time slot of the current subframe of calculating with the gain value computation module of AGC calculates the RSSI of the descending pilot frequency time slot of current subframe.

First judge module be used for to be judged the difference of the RSSI of the RSSI of descending pilot frequency time slot of current subframe and the descending pilot frequency time slot in the last subframe, whether greater than default thresholding.

Adjusting module is used for when first judge module is judged greater than default thresholding, adjust the yield value of AGC of the corresponding time slot of current subframe, and the indication receiver module receives the signal of corresponding time slot with the yield value of the AGC after adjusting.

If first judge module judges difference and be less than or equal to default thresholding, then first judge module indication receiver module directly receives the signal of corresponding time slot with the yield value of the AGC that calculates.

Wherein, adjusting module is adjusted the yield value of AGC of the corresponding time slot of current subframe in the following manner:

Yield value with the AGC of the corresponding time slot of a last subframe adds difference, the yield value of the AGC of the corresponding time slot of the current subframe after obtaining adjusting.

Need to prove that the signal receiver of present embodiment also comprises the 3rd judge module, be used for to judge the RSSI of the descending pilot frequency time slot of the current subframe that the RSSI computing module calculates, whether be saturation power or flood the power of making an uproar the end of to.

If the 3rd judge module judges that the RSSI of the descending pilot frequency time slot of the current subframe of calculating is the normal power of making an uproar at the unsaturation non-submersion end of to, then indicate first judge module whether to carry out difference greater than the judgement of presetting thresholding.

If the RSSI of the descending pilot frequency time slot of the current subframe that the 3rd judge module judge to calculate is saturation power, then notifies receiver module obtaining the yield value of AGC in the following manner, and receive the signal of corresponding time slot with the yield value of the AGC that obtains:

With the yield value of the AGC of the corresponding time slot of a last subframe, deduct parameter preset after adding difference, obtain the yield value of AGC of the corresponding time slot of current subframe.

If the RSSI of the descending pilot frequency time slot of the current subframe that the 3rd judge module judge to calculate floods the power of making an uproar the end of to, then notify receiver module obtaining the yield value of AGC in the following manner, and receive the signal of corresponding time slot with the yield value of the AGC that obtains:

With the yield value of the AGC of the corresponding time slot of a last subframe, add parameter preset after adding difference, obtain the yield value of AGC of the corresponding time slot of current subframe.

Owing in a subframe, not necessarily receive even if TS0 not necessarily exists or exists also, but DwPTS necessarily exists.Therefore the corresponding time slot in the current subframe of present embodiment be with a last subframe in corresponding descending pilot frequency time slot, this paper is that example describes with descending time slot 4, time slot 5 and time slot 6.

Be not difficult to find that first execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of first execution mode.The correlation technique details of mentioning in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in first execution mode.

Four embodiment of the invention relates to a kind of signal receiver.The 4th execution mode improves on the basis of the 3rd execution mode, main improvements are: signal receiver also comprises second judge module, behind the signal for the corresponding time slot that receives current subframe at receiver module, whether the signal of judging each time slot of current subframe is zero-signal, to being judged to be the time slot of zero-signal, the gain value computation module of second judge module indication AGC is judged to be the yield value of the AGC of time slot in current subframe of zero-signal with this, as the yield value of the AGC of corresponding time slot in next subframe.

Be not difficult to find that second execution mode is the method execution mode corresponding with present embodiment, present embodiment can with the enforcement of working in coordination of second execution mode.The correlation technique details of mentioning in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in second execution mode.

Need to prove, each unit of mentioning in each equipment execution mode of the present invention all is logical block, physically, a logical block can be a physical location, it also can be the part of a physical location, can also realize that the physics realization mode of these logical blocks itself is not most important with the combination of a plurality of physical locations, the combination of the function that these logical blocks realize is the key that just solves technical problem proposed by the invention.In addition, for outstanding innovation part of the present invention, above-mentioned each the equipment execution mode of the present invention will not introduced not too close unit with solving technical problem relation proposed by the invention, and this does not show that there is not other unit in the said equipment execution mode.

Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (10)

1. an automatic gain control method of adjustment that receives signal is characterized in that, comprises following steps:

According to the yield value of the automatic gain of last subframe control AGC, calculate the yield value of AGC of the corresponding time slot of current subframe, wherein, described time slot comprises descending pilot frequency time slot;

Described yield value according to the descending pilot frequency time slot of the current subframe of calculating receives the down-bound pilot frequency signal in the current subframe, and calculates the reception signal strength signal intensity indication RSSI of the descending pilot frequency time slot of current subframe;

If the difference of the RSSI of the descending pilot frequency time slot in the RSSI of the descending pilot frequency time slot in the current subframe and the last subframe, greater than default thresholding, then adjust the yield value of AGC of the corresponding time slot of current subframe, receive the signal of corresponding time slot with the yield value of the AGC after adjusting; If described difference is less than or equal to described default thresholding, then directly receive the signal of corresponding time slot with the yield value of the AGC of described calculating.

2. the automatic gain of reception signal according to claim 1 control method of adjustment is characterized in that, adjusts the yield value of AGC of the corresponding time slot of current subframe in the following manner:

Yield value with the AGC of the corresponding time slot of a last subframe adds the above difference, the yield value of the AGC of the corresponding time slot of the current subframe after obtaining adjusting.

3. the automatic gain of reception signal according to claim 1 control method of adjustment is characterized in that, receive the signal of corresponding time slot of current subframe at the yield value with AGC after, also comprise following steps:

Whether the signal of judging each time slot of current subframe is zero-signal, and wherein zero-signal refers to the signal under the discontinuous emission situation;

To being judged to be the time slot of zero-signal, with the yield value of the AGC of this time slot in current subframe, as the yield value of the AGC of corresponding time slot in next subframe.

4. according to the automatic gain of each described reception signal in the claim 1 to 3 control method of adjustment, it is characterized in that, judging that described difference whether before the step greater than described default thresholding, also comprises following steps:

Whether the RSSI that judges the descending pilot frequency time slot of the current subframe of calculating is saturation power or floods the power of making an uproar the end of to;

If the RSSI of the descending pilot frequency time slot of the current subframe of calculating is the normal power of making an uproar at the unsaturation non-submersion end of to, then enters and judge that described difference is whether greater than the step of described default thresholding;

If be saturation power, then obtain the yield value of AGC of the corresponding time slot of current subframe in the following manner, and receive the signal of corresponding time slot with the yield value of the AGC that obtains:

With the yield value of the AGC of the corresponding time slot of a last subframe, deduct parameter preset after adding the above difference, obtain the yield value of AGC of the corresponding time slot of current subframe;

If for to flood the power of making an uproar the end of to, then obtain the yield value of AGC of the corresponding time slot of current subframe in the following manner, and receive the signal of corresponding time slot with the yield value of the AGC that obtains:

With the yield value of the AGC of the corresponding time slot of a last subframe, add described parameter preset after adding the above difference, obtain the yield value of AGC of the corresponding time slot of current subframe.

5. according to the automatic gain of each described reception signal in the claim 1 to 3 control method of adjustment, it is characterized in that, described corresponding time slot be with a last subframe in corresponding descending pilot frequency time slot and other descending time slots in the subframe.

6. a signal receiver is characterized in that, comprises:

The gain value computation module of automatic gain control AGC is used for the yield value according to the AGC of a last subframe, calculates the yield value of AGC of the corresponding time slot of current subframe, and wherein, described time slot comprises descending pilot frequency time slot;

Receiver module is used for the described yield value according to the descending pilot frequency time slot of the current subframe of calculating, and receives the down-bound pilot frequency signal in the current subframe;

Receive signal strength signal intensity indication RSSI computing module, be used for the down-bound pilot frequency signal according to the current subframe of described receiver module reception, the described yield value of the descending pilot frequency time slot of the current subframe of calculating with the gain value computation module of described AGC calculates the RSSI of the descending pilot frequency time slot of current subframe;

First judge module be used for to be judged the difference of the RSSI of the RSSI of descending pilot frequency time slot of current subframe and the descending pilot frequency time slot in the last subframe, whether greater than default thresholding;

Adjusting module is used for when described first judge module is judged greater than described default thresholding, adjusts the yield value of AGC of the corresponding time slot of current subframe, and indicates described receiver module to receive the signal of corresponding time slot with the yield value of the AGC after adjusting;

If described first judge module judges described difference and be less than or equal to described default thresholding, then described first judge module indicates described receiver module directly to receive the signal of corresponding time slot with the yield value of the AGC of described calculating.

7. signal receiver according to claim 6 is characterized in that, described adjusting module is adjusted the yield value of AGC of the corresponding time slot of current subframe in the following manner:

Yield value with the AGC of the corresponding time slot of a last subframe adds the above difference, the yield value of the AGC of the corresponding time slot of the current subframe after obtaining adjusting.

8. signal receiver according to claim 6, it is characterized in that, described signal receiver also comprises second judge module, behind the signal for the corresponding time slot that receives current subframe at described receiver module, whether the signal of judging each time slot of current subframe is zero-signal, to being judged to be the time slot of zero-signal, described second judge module indicates the gain value computation module of described AGC that this is judged to be the yield value of the AGC of time slot in current subframe of zero-signal, as the yield value of the AGC of corresponding time slot in next subframe, wherein zero-signal refers to the signal under the discontinuous emission situation.

9. according to each described signal receiver in the claim 6 to 8, it is characterized in that, described signal receiver also comprises the 3rd judge module, be used for to judge the RSSI of the descending pilot frequency time slot of the current subframe that described RSSI computing module calculates, whether be saturation power or flood the power of making an uproar the end of to;

If described the 3rd judge module judges that the RSSI of the descending pilot frequency time slot of the current subframe of calculating is the normal power of making an uproar at the unsaturation non-submersion end of to, then indicate described first judge module to carry out described difference whether greater than the judgement of described default thresholding;

If described the 3rd judge module judges that the RSSI of the descending pilot frequency time slot of the current subframe of calculating is saturation power, then notify described receiver module obtaining the yield value of AGC in the following manner, and receive the signal of corresponding time slot with the yield value of the AGC that obtains:

With the yield value of the AGC of the corresponding time slot of a last subframe, deduct parameter preset after adding the above difference, obtain the yield value of AGC of the corresponding time slot of current subframe;

If described the 3rd judge module is judged the RSSI of the descending pilot frequency time slot of the current subframe of calculating and is flooded the power of making an uproar the end of to, then notify described receiver module obtaining the yield value of AGC in the following manner, and receive the signal of corresponding time slot with the yield value of the AGC that obtains:

With the yield value of the AGC of the corresponding time slot of a last subframe, add described parameter preset after adding the above difference, obtain the yield value of AGC of the corresponding time slot of current subframe.

10. according to each described signal receiver in the claim 6 to 8, it is characterized in that, described corresponding time slot be with a last subframe in corresponding descending pilot frequency time slot and other descending time slots in the subframe.

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