CN101888267B - Base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technique and signal processing method thereof - Google Patents
Base band receiver of base station in digital wireless trunking communication system based on TDMA (Time Division Multiple Address) technique and signal processing method thereof Download PDFInfo
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Abstract
The invention provides a signal processing method of a base band receiver of a base station in a digital wireless trunking communication system based on a TDMA (Time Division Multiple Address) technique, comprising the following steps of: filtering; converting single sampling signal flows; demodulating each haploid sampling signal flow; sequentially storing each demodulating code sequence; and then recovering a frame structure of one demodulating code sequence selected from the demodulating code sequences according to synchronously judged outputs. The invention provides a realization method for processing base band signals by accomplishing the final selection of the demodulating code sequences and the recovery of the frame structures according to judgment and presets a frame synchronization time window for the characteristics of a TDMA burst structure to greatly reduce the virtual synchronization probability of frame synchronization. Because the frame synchronization is respectively carried out on the demodulating code sequences, the invention avoids data loss caused by wrong bit synchronization, reduces the synchronization loss probability of the frame synchronization, and improves the sensitivity of the base band receiver.
Description
Technical field
The present invention relates to the digital wireless communication technical field, particularly band receiver of base and its implementation of base station in a kind of digital wireless trunking communication system.
Background technology
The band receiver of base of digital communication its objective is the processing of completing the baseband signal that receives, therefrom obtains the data-signal after demodulation.No matter which kind of scheme radio-frequency front-end adopts, and as a rule, the signal of baseband portion is processed and comprised four basic steps: shaping filter, bit synchronization, demodulation, frame synchronization.
Typical digital radio group system is TETRA digital radio group system, adopts the modulation system of pi/4DQPSK, adopts the multi-access mode of TDMA/FDMA.Under prior art, the base band signal process mode of TETRA base station is illustrated in figure 1 as: the signal of many times of over-samplings is through after square root raised cosine filter 101; Be extracted into single synchronizing signal doubly by bit synchronizer 102; Be reduced into the numeric data code sequence through pi/4DQPSK demodulator 103 again; Recovered at last the frame structure of data by frame synchronization module 104.
The bit synchronous major function in base station is to select a road of intersymbol interference minimum to be used as data demodulates from the signal of over-sampling.The major function of frame synchronization is from the code sequence that the front end demodulation obtains, and identifies the training sequence of up link, and determines the data format of corresponding frame according to this training sequence.
Under prior art, in tdma system, frame synchronization is relatively easy, the general method of adjudicating according to the Hamming distance between receiving demodulation code sequence and training sequence that adopts.And bit synchronization often adopts quadratic method.Signal to noise ratio higher and the decline unconspicuous condition under, quadratic method has good performance.Therefore, under prior art, in tdma system, the performance of receiver depends on the performance of bit synchronizer to a great extent.
In the environment of wireless cluster communication, sometimes have the situation that signal to noise ratio is not high or decline is darker and occur.Under the condition of and deep fade not high in signal to noise ratio, the hydraulic performance decline of quadratic method will cause the probability of timing error to increase, and then directly cause false synchronous and probability synchronization loss greatly to increase.The main cause of quadratic method hydraulic performance decline is accumulate just the long time of quadratic method needs to reach better performance, but the environment of deep fade makes long-time accumulation not reach the effect of anticipation, even can bring mistake.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of signal processing method based on the band receiver of base of base station in the digital wireless trunking communication system of TDMA technology, can guarantee that band receiver of base receives signal stably and accurately.For this reason, the present invention is by the following technical solutions: it comprises the following steps:
1-1), the signal stream of many times of over-samplings carried out filtering;
1-2), filtered many times of oversampled signals circulation is changed to the single-time sampling signal stream of multidiameter delay;
1-3), each road single-time sampling signal stream is carried out demodulation, obtain each road demodulation code sequence;
1-4), each road demodulation code sequence is stored in order;
Described signal processing method carries out frame synchronization to signal and detects and synchronization decisions, comprises the following steps:
The step of frame synchronization window signal is provided;
Under the control of frame synchronization window signal, the demodulation code sequence of the single-time sampling signal of multidiameter delay stream is carried out the step that frame synchronization detects simultaneously;
Under the control of frame synchronization window signal, synchronization decisions is carried out in the output that frame synchronization detects;
Described signal processing method selects one the tunnel according to the output of synchronization decisions in each road demodulation code sequence of storing, and recovers frame structure.
Owing to adopting technical scheme of the present invention, the present invention utilizes the relatively easy characteristics of tdma system frame synchronization, provide a kind of multichannel frame synchronization of utilizing to detect and adjudicate, and completed the final selection of demodulation code sequence and the implementation method of the base band signal process that frame structure recovers according to judgement.Simultaneously preset the frame synchronization time window for the characteristics of TDMA burst structure, greatly reduced the false synchronous probability of frame synchronization.Owing to carrying out frame synchronization respectively on multi-channel demodulator code sequence, avoided the loss of data that causes due to the bit synchronization mistake, reduced the synchronization loss probability of frame synchronization, improve the sensitivity of band receiver of base.
In addition, synchronization decisions of the present invention is carried out in the frame synchronization time window, so not only reduced the false synchronous probability of frame synchronization, the computing of frame synchronization detection simultaneously is limited in carrying out in the frame synchronization time window, has reduced to a great extent the operand that frame synchronization detects.
Signal processing method provided by the present invention also can adopt following further technical scheme simultaneously:
Described frame synchronization detects, and is under the control of frame synchronization window signal, in the frame synchronization time window, according to training sequence, carries out in order Hamming distance for described each road demodulation code sequence and calculates.
Described synchronization decisions is under the control of frame synchronization window signal, completes by the following method judgement in the frame synchronization time window:
3-1), utilization Hamming distance corresponding to multi-channel demodulator code sequence in order, whether obtain synchronous judgement, if Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is 0, current demodulation symbol is frame sync mark, and the centre one tunnel of choosing all Hamming distances and being in 0 each road is the bit synchronization sign;
If 3-2) Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is that 0 condition can not meet, proceed to judge;
If 3-3) Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is less than threshold value TH, current demodulation symbol is frame sync mark, and the road demodulation code sequence of choosing the Hamming distance minimum is the bit synchronization sign; If exist multi-channel demodulator code sequence to have identical smallest hamming distance, choose middle one the tunnel; If there is no Hamming distance corresponding to adjacent at least 3 road demodulation code sequences less than threshold value TH, returned and waited for one group of new Hamming distance corresponding to next demodulation symbol;
If 3-4) fail to have enough time to complete above-mentioned judgement in the frame synchronization time window, the synchronization decisions device does not provide output, gets back to idle condition, waits for next frame synchronization window signal.
Described demodulation symbol is the reduction of transmitter end modulation symbol, is exported by demodulator.Corresponding with the modulator work of transmitter end, the demodulator output demodulation symbol of receiver end, the anti-output bit that is mapped to, continuous output bit consists of the demodulation code sequence.
Described Hamming distance is calculated and is adopted following steps to carry out:
1), correspondingly deposit in order multi-channel demodulator code sequence in a plurality of data buffer zones;
2), carry out Hamming distance calculate under the frame synchronization window signal controlled, the method for calculating is, in the frame synchronization time window, according to each demodulation symbol, calculates the Hamming distance between demodulation code sequence and training sequence in corresponding data buffer zone.
Above-described frame synchronization time window, its initial time refers to the transmitting range travelling carriage nearest from the base station, in the situation that signal processing delay minimum, the moment of the complete arrival of the normal training sequence base station that comprises in the burst sequences that sends; Its finish time, refer to transmitting range from the base station farthest travelling carriage, the complete arrival of the training sequence that comprises in the burst sequences that sends base station, and the signal of experience maximum delay moment of processing.
Described frame synchronization window signal is provided by frame synchronization window timing device.Frame synchronization window timing device obtains initial time and the finish time of frame synchronization time window with the method for counting and timing under the control of a slot clock signal, and this frame synchronization time window is exported with the mode of signal.
Another technical scheme to be solved of the present invention is to provide a kind of band receiver of base that utilizes said method.For this reason, the present invention is by the following technical solutions: band receiver of base comprises forming filter, demodulator, frame synchronization checkout gear, also comprises:
1), over-sampling string and conversion equipment, described over-sampling string and conversion equipment will be through many times of oversampled signals streams of the serial after described forming filter, convert parallel multichannel single-time sampling signal stream to, and with these single-time sampling signal stream, be sent to accordingly in order the follow-up described demodulator in each road;
Described band receiver of base is provided with the described demodulator of multichannel to process respectively described multichannel single-time sampling signal stream, and described band receiver of base is provided with multichannel frame synchronization checkout gear and detects respectively the multi-channel demodulator code sequence of described demodulator output is carried out frame synchronization;
2), the demodulation code sequence memory, described demodulation code sequence memory is used for storing in order the multi-channel demodulator code sequence of the described demodulator output in all each roads, transfers to MUX and goes to select a road final output;
3), frame synchronization window timing device, described frame synchronization window timing device is used for according to the TDMA burst structure, estimate the time window that up TDMA burst arrives, and provide accordingly the frame synchronization window signal to described each road frame synchronization checkout gear, synchronization decisions device; And provide reset signal to described demodulation code sequence memory;
4), the synchronization decisions device, described synchronization decisions device carries out frame synchronization, bit synchronous judgement based on the result of described each road frame synchronization checkout gear;
5), MUX, described MUX is according to the bit synchronization sign of described synchronization decisions device output, select a road among the multi-channel demodulator code sequence in described demodulation code sequence memory, and recover frame structure according to frame sync mark, as the data output of whole band receiver of base.
Described frame synchronization checkout gear, its main body are the Hamming distance calculation elements.Described Hamming distance calculation element, its effect are the Hamming distances between the interior demodulation code sequence of calculated data buffering area and training sequence; Before being arranged on the Hamming distance calculation element, deposit for the demodulation code sequence of calculating Hamming distance described data buffer zone.
The data buffer length of described frame synchronization checkout gear is not less than the length of training sequence.
Owing to adopting technique scheme of the present invention, the present invention can utilize said method to carry out signal and process.According to elaboration of the present invention, through many times of oversampled signals streams after forming filter filtering, not to be chosen to be an independent single-time sampling signal stream through bit synchronization to separate mediation frame synchronization; But being converted to the single-time sampling signal stream of multichannel by over-sampling string and conversion equipment, the single-time sampling signal stream on each road all experiences one and separates the process of frame synchronization of being in harmonious proportion.The output of this group frame synchronization checkout gear in order, transferring to described synchronization decisions device adjudicates and obtains final bit synchronization sign and frame sync mark, select a road in all each road demodulation code sequences in order in described demodulation code sequence memory by the described MUX bit synchronization sign final according to this again, and recover its frame structure according to frame sync mark, as the output data of whole band receiver of base.Thus, the present invention utilizes the relatively easy characteristics of tdma system frame synchronization, carries out frame synchronization respectively on multi-channel demodulator code sequence, has avoided the loss of data that causes due to the bit synchronization mistake, has reduced the synchronization loss probability of frame synchronization.By the employing of frame synchronization window timing device, reduce the false synchronous probability of frame synchronization simultaneously.Adopt the present invention, can improve synchronous precision, particularly overcome bit synchronous unsteadiness under low signal-to-noise ratio and deep fade condition, thereby ensure that receiver receives signal stably and accurately.
Band receiver of base of the present invention, comprise forming filter, demodulator, frame synchronization checkout gear, over-sampling string and the conversion equipment, demodulation code sequence memory, frame synchronization window timing device, synchronization decisions device and the MUX that consist of band receiver of base, can use the different digital signal processors such as FPGA, DSP to realize, and can be used in conjunction with the radio-frequency (RF) front-end circuit that adopts different implementation methods.
Description of drawings
Fig. 1 is the theory diagram of band receiver of base under prior art.
Fig. 2 is the structured flowchart of band receiver of base of the present invention.
Fig. 3 is the flow chart of method for processing baseband signal of the present invention.
Fig. 4 is the flow chart of synchronization decisions of the present invention.
Embodiment
With reference to Fig. 2.Take the band receiver of base that is applied to the TETRA trunked base station as example, its composition of band receiver of base provided by the present invention comprises square root raised cosine filter 201, over-sampling string and conversion equipment 202, differential ference spiral device 203, demodulation code sequence memory 204, data buffer zone 205, Hamming distance calculation element 206, frame synchronization window timing device 207, synchronization decisions device 208 and MUX 209.
The many times of oversampled signals streams that described square root raised cosine filter 201 is responsible for inputting carry out shaping filter, connect thereafter over-sampling string and conversion equipment 202.Described over-sampling string and conversion equipment change many times of oversampled signals circulations of serial into the single-time sampling signal stream of multidiameter delay, connect thereafter the differential ference spiral device 203 of multichannel.Each differential ference spiral device is provided with and connects data buffer zone 205 and the interface that is connected demodulation code sequence memory 204 separately.Each data buffer zone is connected with corresponding Hamming distance calculation element 206.Described frame synchronization window timing device 207 is worked under slot clock triggers, and is provided with the interface with each road Hamming distance calculation element, synchronization decisions device 208, so that the frame synchronization window signal to be provided; And be provided with interface with the demodulation code sequence memory, so that reset signal to be provided.Described synchronization decisions device is provided with the interface that connects respectively frame synchronization window timing device, each road Hamming distance calculation element and MUX 209.Described MUX connects demodulation code sequence memory and synchronization decisions device, is responsible for selecting and exports the final demodulation code sequence of recovering frame structure.
As shown in Figure 3, the base band signal process flow process is as follows:
Above-mentioned band receiver of base receives many times of oversampled signals streams 301.Be 16 times of oversampled signals streams in the present embodiment.
At first received signal stream pass through shaping filter 302.Forming filter in the present embodiment is the Square-root Raised Cosine forming filter.
Then go here and there and change 303 by over-sampling string and conversion equipment.In the present embodiment, 16 times of oversampled signals streams of serial are converted into 16 tunnel single times of parallel signal streams, are labeled as in order the 1 the road to the 16 the tunnel.
These multiple signals streams are sent to respectively follow-up a plurality of demodulators and carry out multidiameter delay demodulation 304.In the present embodiment, these demodulators are pi/4DQPSK differential ference spiral device.
The the 1 road to the 16 road demodulation code sequence of demodulation output all stores demodulation code sequence memory 305 into.Due to the memory stores of band receiver of base of the present invention be the demodulation code sequence, the signal stream before the storage demodulation, needed memory space is less.
Carry out frame synchronization and detect and synchronization decisions 306, obtain frame sync mark and bit synchronization sign.
MUX selects one the tunnel in 16 road demodulation code sequences according to the bit synchronization sign from be stored in the demodulation code sequence memory after the output that receives from the synchronization decisions device, and recovers frame structure 307 according to frame sync mark.
With reference to Fig. 2, frame synchronization detects and the synchronization decisions method comprises the following steps:
Step 1, the frame synchronization window signal that frame synchronization window timing device provides is as the enable signal of 16 tunnel frame synchronization checkout gears, synchronization decisions device.
Step 2, the demodulation code sequence of exporting after aforementioned 16 tunnel differential ference spirals not only is stored in the demodulation code sequence memory, simultaneously also as the input of 16 tunnel frame synchronization checkout gears.Before the frame synchronization window signal arrived, at first the demodulation code sequence carried out buffer-stored through the data buffer zone; When the frame synchronization window signal arrived, demodulation code sequence and training sequence that each road Hamming distance calculation element will be stored in the corresponding data buffering area carried out Hamming distance calculating.In the present embodiment, choosing the data buffer zone is the 30bit buffering area.
16 tunnel frame synchronization are calculated one group 16 Hamming distance result of calculations in order that obtain, as the input of synchronization decisions device.
Step 3 is carried out synchronization decisions by the synchronization decisions device, obtains frame synchronization and bit synchronous sign.
As shown in Figure 4, the workflow of synchronization decisions device is:
Before the frame synchronization window signal arrived, the synchronization decisions device was in idle condition 401; After the frame synchronization window signal arrived 402, the synchronization decisions device entered operating state.After receiving one group of Hamming distance 403 calculating according to new demodulation symbol, check at first whether adjacent at least 3 road Hamming distances corresponding to demodulation code sequence equal to be labeled as 404 in 0, Fig. 4.If condition is set up, current demodulation symbol is frame sync mark, and the centre one tunnel of choosing all Hamming distances and being in 0 each road is bit synchronization sign 405; If condition is false, proceed next step judgement.If Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is labeled as 406 less than threshold value TH in Fig. 4, current demodulation symbol is frame sync mark, and one road demodulation code sequence of getting the Hamming distance minimum is the bit synchronization sign; If exist multi-channel demodulator code sequence to have identical smallest hamming distance, choose middle one the tunnel 407.In the present embodiment, threshold value TH is taken as 3.If there is no Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is less than threshold value TH, and the synchronization decisions device returns waits for one group of new Hamming distance 403 corresponding to next demodulation symbol.
After the output 408 of synchronization decisions was provided, the synchronization decisions device was got back to idle condition 401, waited for next frame synchronization window signal.
If in the frame synchronization time window, the synchronization decisions device fails to obtain to meet frame synchronization and the bit synchronization sign of judgment condition, and the synchronization decisions device does not provide output, gets back to idle condition, waits for next frame synchronization window signal.
The characteristics that the present invention is directed to the TDMA burst structure have been preset the frame synchronization time window, greatly reduce the false synchronous probability of frame synchronization.And carry out frame synchronization respectively on multi-channel demodulator code sequence, and avoided the loss of data that causes due to the bit synchronization mistake, reduced the synchronization loss probability of frame synchronization.Under the accomplished condition of above-mentioned simultaneous techniques, the sensitivity behaviour of band receiver of base is improved.
Should be understood that, the above angle from specific embodiment discloses further to technology contents of the present invention, and its purpose is to allow everybody be easier to understand content of the present invention, but does not represent that embodiments of the present invention and rights protection are confined to this.Protection range of the present invention is illustrated in appended claims, and every apparent modification within aim of the present invention is also due within protection of the present invention.
Claims (7)
1. signal processing method based on the band receiver of base of base station in the digital wireless trunking communication system of TDMA technology is characterized in that it comprises the following steps:
1-1), the signal stream of many times of over-samplings carried out filtering;
1-2), filtered many times of oversampled signals circulation is changed to the single-time sampling signal stream of multidiameter delay;
1-3), each road single-time sampling signal stream is carried out demodulation, obtain each road demodulation code sequence;
1-4), each road demodulation code sequence is stored in order;
Described signal processing method carries out frame synchronization to signal and detects and synchronization decisions, comprises the following steps:
The step of frame synchronization window signal is provided;
Under the control of frame synchronization window signal, the demodulation code sequence of the single-time sampling signal of multidiameter delay stream is carried out the step that frame synchronization detects simultaneously;
Under the control of frame synchronization window signal, synchronization decisions is carried out in the output that frame synchronization detects;
Described signal processing method selects one the tunnel according to the output of synchronization decisions in each road demodulation code sequence of storing, and recovers frame structure;
Described synchronization decisions is under the control of frame synchronization window signal, completes by the following method judgement when frame synchronization in the window:
3-1), utilization Hamming distance corresponding to multi-channel demodulator code sequence in order, whether obtain synchronous judgement, if Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is 0, current demodulation symbol is frame sync mark, and the centre one tunnel of choosing all Hamming distances and being in 0 each road is the bit synchronization sign;
If 3-2) Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is that 0 condition can not meet, proceed to judge;
If 3-3) Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is less than threshold value TH, current demodulation symbol is frame sync mark, and the road demodulation code sequence of choosing the Hamming distance minimum is the bit synchronization sign; If exist multi-channel demodulator code sequence to have identical smallest hamming distance, choose middle one the tunnel; If there is no Hamming distance corresponding to adjacent at least 3 road demodulation code sequences less than threshold value TH, returned and waited for one group of new Hamming distance corresponding to next demodulation symbol;
If 3-4) fail to have enough time to complete above-mentioned judgement in the frame synchronization time window, the synchronization decisions device does not provide output, gets back to idle condition, waits for next frame synchronization window signal;
Described demodulation symbol is the reduction of transmitter end modulation symbol, is exported by demodulator; Corresponding with the modulator work of transmitter end, the demodulator output demodulation symbol of receiver end, the anti-output bit that is mapped to, continuous output bit consists of the demodulation code sequence.
2. the signal processing method based on the band receiver of base of base station in the digital wireless trunking communication system of TDMA technology as claimed in claim 1, it is characterized in that its employing following methods carries out frame synchronization and detects: under the control of frame synchronization window signal, in the frame synchronization time window, according to training sequence, carry out in order Hamming distance for described each road demodulation code sequence and calculate.
3. the signal processing method based on the band receiver of base of base station in the digital wireless trunking communication system of TDMA technology as claimed in claim 2 is characterized in that its adopts following steps to carry out Hamming distance and calculate:
1), correspondingly deposit in order multi-channel demodulator code sequence in a plurality of data buffer zones;
2), carry out Hamming distance calculate under the frame synchronization window signal controlled, the method for calculating is, in the frame synchronization time window, according to each demodulation symbol, calculates the Hamming distance between demodulation code sequence and training sequence in corresponding data buffer zone.
4. the signal processing method based on the band receiver of base of base station in the digital wireless trunking communication system of TDMA technology as claimed in claim 1, is characterized in that described frame synchronization window signal is provided by frame synchronization window timing device; Frame synchronization window timing device obtains initial time and the finish time of frame synchronization time window with the method for counting and timing under the control of a slot clock signal, and this frame synchronization time window is exported with the mode of signal.
5. utilize the band receiver of base of the described method of claim 1, comprise forming filter, demodulator, frame synchronization checkout gear, it is characterized in that described band receiver of base also comprises:
1), over-sampling string and conversion equipment, described over-sampling string and conversion equipment will be through many times of oversampled signals streams of the serial after described forming filter, convert parallel multichannel single-time sampling signal stream to, and with these single-time sampling signal stream, be sent to accordingly in order the follow-up described demodulator in each road;
Described band receiver of base is provided with the described demodulator of multichannel to process respectively described multichannel single-time sampling signal stream, and described band receiver of base is provided with multichannel frame synchronization checkout gear and detects respectively the multi-channel demodulator code sequence of described demodulator output is carried out frame synchronization;
2), the demodulation code sequence memory, described demodulation code sequence memory is used for storing in order the multi-channel demodulator code sequence of the described demodulator output in all each roads, transfers to MUX and goes to select a road final output;
3), frame synchronization window timing device, described frame synchronization window timing device is used for according to the TDMA burst structure, estimate the time window that up TDMA burst arrives, and provide accordingly the frame synchronization window signal to described each road frame synchronization checkout gear, synchronization decisions device; And provide reset signal to described demodulation code sequence memory;
4), the synchronization decisions device, described synchronization decisions device carries out frame synchronization and bit synchronous judgement based on the result of described each road frame synchronization checkout gear;
5), MUX, described MUX is according to the bit synchronization sign of described synchronization decisions device output, select a road among the multi-channel demodulator code sequence in described demodulation code sequence memory, and recover frame structure according to frame sync mark, as the data output of whole band receiver of base;
Described synchronization decisions is under the control of frame synchronization window signal, completes by the following method judgement in the frame synchronization time window:
3-1), utilization Hamming distance corresponding to multi-channel demodulator code sequence in order, whether obtain synchronous judgement, if Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is 0, current demodulation symbol is frame sync mark, and the centre one tunnel of choosing all Hamming distances and being in 0 each road is the bit synchronization sign;
If 3-2) Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is that 0 condition can not meet, proceed to judge;
If 3-3) Hamming distance corresponding to adjacent at least 3 road demodulation code sequences is less than threshold value TH, current demodulation symbol is frame sync mark, and the road demodulation code sequence of choosing the Hamming distance minimum is the bit synchronization sign; If exist multi-channel demodulator code sequence to have identical smallest hamming distance, choose middle one the tunnel; If there is no Hamming distance corresponding to adjacent at least 3 road demodulation code sequences less than threshold value TH, returned and waited for one group of new Hamming distance corresponding to next demodulation symbol;
If 3-4) fail to have enough time to complete above-mentioned judgement in the frame synchronization time window, the synchronization decisions device does not provide output, gets back to idle condition, waits for next frame synchronization window signal;
Described demodulation symbol is the reduction of transmitter end modulation symbol, is exported by demodulator; Corresponding with the modulator work of transmitter end, the demodulator output demodulation symbol of receiver end, the anti-output bit that is mapped to, continuous output bit consists of the demodulation code sequence.
6. band receiver of base as claimed in claim 5, is characterized in that described frame synchronization checkout gear, and its main body is the Hamming distance calculation element; Described Hamming distance calculation element, its effect are the Hamming distances between the interior demodulation code sequence of calculated data buffering area and training sequence; Before being arranged on the Hamming distance calculation element, deposit for the demodulation code sequence of calculating Hamming distance described data buffer zone.
7. band receiver of base according to claim 6, is characterized in that the data buffer length of described frame synchronization checkout gear is not less than the length of training sequence.
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| CN1347218A (en) * | 2001-10-22 | 2002-05-01 | 信息产业部电信传输研究所 | Method and device for implementing multipath search in WCDMA down link |
| EP1528693A2 (en) * | 2003-10-28 | 2005-05-04 | Lg Electronics Inc. | Frame synchronization for a mobile communication system |
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| CN1347218A (en) * | 2001-10-22 | 2002-05-01 | 信息产业部电信传输研究所 | Method and device for implementing multipath search in WCDMA down link |
| EP1528693A2 (en) * | 2003-10-28 | 2005-05-04 | Lg Electronics Inc. | Frame synchronization for a mobile communication system |
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