CN103220237B - A kind of transmission, the method and device for receiving CDMA spread spectrum symbols - Google Patents
A kind of transmission, the method and device for receiving CDMA spread spectrum symbols Download PDFInfo
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Abstract
The invention discloses a kind of transmission, the method and device of reception CDMA CDMA spread spectrum symbols, to improve the channel estimation of CDMA spread spectrum symbols, so as to improve cdma system performance.Transmission method includes：M pilot signal is inserted between N number of CDMA spread spectrums symbol to be transmitted, and each CDMA spread spectrums to be transmitted accord with the threshold value of the distance difference and the mean value of value between less than setting of each pilot signal；The N and M are positive integer, and N is more than M, and M is more than or equal to 1；N number of CDMA spread spectrums symbol to be transmitted and the M pilot signal are transmitted on the same timeslot.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of transmission, reception CDMA (Code Division Multiple
Access, CDMA) spread the method and device for according with.
Background technology
The appearance of CDMA technology stems from demand of the mankind to higher quality radio communication；During World War II
CDMA technology is researched and developed because of the needs of war, its thought original intention is the interference for preventing enemy from communicating to one's own side, therefore,
CDMA technology is widely used in military antijam communication during war.
With FDMA (Frequency Division Multiple Access, frequency division multiple access) technologies and TDMA (Time
Division Multiple Access, time division multiple acess) technology compares, and CDMA technology has the advantages that many uniquenesses, and these are only
On the one hand special advantage is to be determined by the intrinsic characteristic of spread spectrum communication system, is on the other hand by soft handover and Power Control etc.
Technology is determined.Several technologies such as cdma mobile communication net is by spreading, multiple access is accessed, beehive net and frequency reuse combine and
Into, the cooperation containing the process of frequency domain, time domain and code domain three dimensional signal, thus CDMA have anti-interference and anti-multipath fading preferably,
The advantages of secret and safe is high, and also there is CDMA same frequency can be less than in reuse, carrier/interface ratio (C/I) in multiple cells
1st, the attributes such as trade-off can be done between capacity and quality；These attributes cause cdma system more more advantageous than other systems.
(include all wave bands) in actual radio propagation channel, the transmission path for often having many time delays different,
Referred to as multipath phenomenon.The electrical length meeting time to time change of each transmission paths, therefore reach between each component fields of receiving point
Phase relation is also time to time change.The Random of these component fields forms the decline of total received field.For difference
Frequency, the phase relation between each component fields are differed.Therefore, their interference effect is also different because of frequency, and this characteristic claims
For frequency selectivity.In Wideband signal transmission, frequency selectivity may be showed substantially, form intermodulation.It is corresponding to this, due to not
There is different delay with transmission path, therefore, the signal sent in synchronization may be being received respectively along different paths
Scatter before and after point, and narrow pulse signal then forward laps.
Due to the band limiting of actual channel, and deviate ideal characterisitics, therefore signal all can be in certain journey on frequency domain
Linear distortion is produced on degree, effect when the waveform of signal can occur in time domain, is dissipated, effect is dissipated when this digital communication is made
Into harm be referred to as intersymbol interference (i.e. ISI).In addition, in wireless channel, due to there is multipath transmisstion, therefore
Carry out data transmission also producing ISI in wireless channel.
Multipath effect (i.e. multipath effect) is referred to caused by the Multipath Transmission phenomenon in radio wave propagation channel
Interfere delay effect.(include all wave bands) comprising the different transmission road of a plurality of time delay in actual radio propagation channel
Footpath, each transmission path when postpone a meeting or conference and change over, participate in the phase relation between each component fields interfered also just with the time
Change, so as to cause change that wave field synthesis also can be over time and change at random, so as to form the decline of total received field.It is many
Footpath effect is the important origin cause of formation of decline, suffers from extremely serious impact to digital communication, radar optimum detection etc..
Multipath effect has large effect to the performance of cdma system, in general communication system, pilot tone of all sampling
To carry out channel estimation, the insertion of pilot tone can cause communication system to carry out coherent demodulation, but the expense of pilot tone is also to affect
The key factor of systematic function and efficiency.
Channel variation is faster, and the pilot tone carried out required for channel estimation is more, therefore, for channel variation feelings faster
Condition, the expense of pilot tone are larger.In existing 3G standard, data sending terminal transmit CDMA spread spectrum symbol when, between CDMA symbols
Certain position insert pilot signal, so as to data receiver according to the pilot signal of insertion determining channel information, then root
The CDMA spread spectrum symbols on current time all channels are recovered according to channel information；As shown in figure 1, at a time, transmitting terminal
2k spread spectrum symbol of transmission (respectively with S1, S2 ..., S2k represents), pilot signal is inserted (such as in the position between Sk and Sk+1
Midamble)；There is following technological deficiency using said method transmission CDMA spread spectrum symbols：Although can be accurate according to pilot signal
The channel estimation of the nearer spread symbol (such as Sk, Sk+1) of pilot signal of adjusting the distance estimated, but adjust the distance pilot tone letter
The channel estimation of spread symbol (such as S1 and S2k) number farther out is poor, therefore, the CDMA in prior art to synchronization transmission
The channel estimation gap of spread spectrum symbol is larger, causes the channel estimation of part CDMA spread spectrum symbols preferably, the letter of part CDMA spread spectrum symbols
Road estimates poor, so as to cause cdma system poor-performing.
The content of the invention
The embodiment of the present invention provides a kind of transmission, receives CDMA (Code Division Multiple Access, code division
Multiple access) method and device for according with is spread, to improve the channel estimation of CDMA spread spectrum symbols, so as to improve cdma system performance.
A kind of method of transmission CDMA CDMA spread spectrum symbols, including：
M pilot signal, and each CDMA spread spectrums symbol to be transmitted are inserted between N number of CDMA spread spectrums symbol to be transmitted to each pilot tone
Threshold value of the distance difference and the mean value of value between of signal less than setting；The N and M are positive integer, and N is more than M,
M is more than or equal to 1；
N number of CDMA spread spectrums symbol to be transmitted and the M pilot signal are transmitted on the same timeslot.
It is preferred that before M pilot signal is inserted in the relevant position between N number of CDMA spread spectrums symbol to be transmitted, also including：
Each CDMA spread spectrums symbol to be transmitted is divided into into (M+1) part, successively by CDMA spread spectrum symbol one sequence of composition of N number of 1/ (M+1)
Row, obtain (M+1) individual sequence；
M pilot signal is inserted in relevant position between N number of CDMA spread spectrums symbol to be transmitted, specifically includes：Any two
Insert a pilot signal in position between individual adjacent sequence.
It is preferred that the threshold value is set toWherein L is the total length of data and M of N number of CDMA spread spectrums symbol
The total length of data and value of individual pilot signal, quantity of the M for pilot signal.
It is preferred that the pilot signal is Midamble codes.
A kind of method for receiving CDMA CDMA spread spectrum symbols, including：
Receive user terminal sends on the same timeslot CDMA spread spectrums symbol N number of to be transmitted and M pilot signal, the M
Individual pilot signal is inserted in the position between N number of CDMA to be transmitted spread spectrum symbol, and each CDMA spread spectrums symbol to be transmitted is to respectively leading
Threshold value of the distance difference and the mean value of value between of frequency signal less than setting；The N and M are positive integer, and N is more than
M, M are more than or equal to 1；
The corresponding channel information in N number of pilot signal position is determined according to N number of pilot signal, and according to
The channel information determined, accords with from N number of CDMA spread spectrums and corresponding CDMA spread spectrums is recovered in the corresponding channel in position
Symbol.
It is preferred that each CDMA spread spectrums symbol to be transmitted is averagely divided into (M+1) part, and the CDMA spread spectrum symbols of N number of 1/ (M+1)
One sequence of composition, obtains (M+1) individual sequence；Position between the adjacent sequence of any two is inserted with a pilot signal.
It is preferred that the threshold value is set toWherein L is the total length of data and M of N number of CDMA spread spectrums symbol
The total length of data and value of individual pilot signal, quantity of the M for pilot signal.
It is preferred that the pilot signal is Midamble codes.
A kind of device of transmission CDMA CDMA spread spectrum symbols, including：
Pilot plug-in unit is for inserting M pilot signal and each to be transmitted between N number of CDMA spread spectrums symbol to be transmitted
CDMA spread spectrums symbol is less than the threshold value of setting to the distance difference and the mean value of value between of each pilot signal；The N and M are equal
For positive integer, and N is more than M, and M is more than or equal to 1；
Transmitting element, for transmitting N number of CDMA spread spectrums symbol to be transmitted and M pilot tone letter on the same timeslot
Number.
It is preferred that described device also includes：
Spread spectrum symbol signal generating unit, for each CDMA spread spectrums symbol to be transmitted is divided into (M+1) part, successively by N number of 1/
(M+1) CDMA spread spectrum symbol one sequence of composition, obtains (M+1) individual sequence；
The pilot plug-in unit, specifically in the adjacent sequence of any two of the spread spectrum symbol signal generating unit generation
Insert a pilot signal in position between row.
It is preferred that the threshold value is set toWherein L is the total length of data and M of N number of CDMA spread spectrums symbol
The total length of data and value of individual pilot signal, quantity of the M for pilot signal.
It is preferred that the pilot signal is Midamble codes.
A kind of device for receiving CDMA CDMA spread spectrum symbols, including：
Receiving unit, leads with M for the CDMA spread spectrums symbol N number of to be transmitted that receive user terminal on the same timeslot sends
Frequency signal, the M pilot signal are inserted in the position between N number of CDMA spread spectrums symbol to be transmitted, and each CDMA to be transmitted
Spread spectrum symbol is less than the threshold value of setting to the distance difference and the mean value of value between of each pilot signal；The N and M are just
Integer, and N is more than M, M is more than or equal to 1；
Channel estimating unit, the described N number of pilot signal for being received according to the receiving unit are determined described N number of
The corresponding channel information in pilot signal position；
Recovery unit, for the channel information determined according to the channel estimating unit, from N number of CDMA spread spectrums symbol
Corresponding CDMA spread spectrums symbol is recovered in the corresponding channel in position.
It is preferred that each CDMA spread spectrums symbol to be transmitted is averagely divided into (M+1) part, and the CDMA spread spectrum symbols of N number of 1/ (M+1)
One sequence of composition, obtains (M+1) individual sequence；
Position between the adjacent sequence of any two is inserted with a pilot signal.
It is preferred that the threshold value is set toWherein L is the total length of data and M of N number of CDMA spread spectrums symbol
The total length of data and value of individual pilot signal, quantity of the M for pilot signal.
It is preferred that the pilot signal is Midamble codes.
In the embodiment of the present invention, M pilot signal is inserted between N number of CDMA spread spectrums symbol to be transmitted, and it is each to be transmitted
CDMA spread spectrums symbol is less than the threshold value of setting to the distance difference and the mean value of value between of each pilot signal；The N and M are equal
For positive integer, and N is more than M, and M is more than or equal to 1, therefore, using technical solution of the present invention, due to each CDMA spread spectrums symbol to be transmitted
Difference to the mean value of the distance of each pilot signal is less than the threshold value of setting, therefore, it can what is determined according to pilot signal
Channel information is more accurate channel estimation is carried out to the corresponding channel in each CDMA spread spectrum symbols position, improves on the whole same
The channel estimation of the CDMA spread spectrum symbols on one time slot, so as to improve the performance of cdma system.
Description of the drawings
Fig. 1 be prior art in CDMA spread symbol in insert pilot signal structural representation；
Fig. 2 spreads the method flow diagram for according with to transmit CDMA in end side in the embodiment of the present invention；
Fig. 3 spreads the schematic diagram that in symbol insert a pilot signal in CDMA for what is provided in the embodiment of the present invention；
Fig. 4 spreads the schematic diagram that in symbol insert multiple pilot signals in CDMA for what is provided in the embodiment of the present invention；
Fig. 5 spreads the method flow diagram for according with to receive CDMA in network side in the embodiment of the present invention；
Fig. 6 A are one of structural representation of device of transmission CDMA spread spectrum symbols in the embodiment of the present invention；
Fig. 6 B are the two of the structural representation of the device of transmission CDMA spread spectrum symbols in the embodiment of the present invention；
Fig. 7 is the structural representation of the device of reception CDMA spread spectrum symbols in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention provides a kind of transmission, receives CDMA (Code Division Multiple Access, code division
Multiple access) method and device for according with is spread, to improve the channel estimation of CDMA spread spectrum symbols, so as to improve cdma system performance.Specifically
Method is as follows：Transmitting terminal inserts M pilot signal, and each CDMA spread spectrums symbol to be transmitted between N number of CDMA spread spectrums symbol to be transmitted
The distance difference and the mean value of value between to each pilot signal is less than the threshold value for setting；The N and M are positive integer,
And N is more than M, M is more than or equal to 1；N number of CDMA spread spectrums symbol to be transmitted and M pilot tone letter are transmitted on the same timeslot
Number.Correspondingly, in receiving terminal, when above-mentioned N number of CDMA spread spectrums symbol and N number of pilot signal of transmitting terminal transmission is received, according to
N number of pilot signal determines the corresponding channel information in N number of pilot signal position, and according to the channel determined
Information, accords with from N number of CDMA spread spectrums and corresponding CDMA spread spectrums symbol is recovered in the corresponding channel in position.Using the present invention
Technical scheme, as the difference of each CDMA spread spectrums symbol to be transmitted to the mean value of the distance of each pilot signal is less than the threshold for setting
Value, therefore, it can the channel information determined according to pilot signal to enter the corresponding channel in each CDMA spread spectrum symbols position
Row channel estimation is more accurate, improves the channel estimation of the CDMA spread spectrum symbols on same time slot on the whole, so as to improve
The performance of cdma system.
Technical solution of the present invention is described in detail with reference to Figure of description.
Referring to Fig. 2, it is the method flow diagram for transmitting CDMA spread spectrum symbols in the embodiment of the present invention based on user terminal, the method
Including：
Step 201, M pilot signal is inserted between N number of CDMA to be transmitted spread spectrum symbol, and each CDMA spread spectrums to be transmitted are accorded with
The distance difference and the mean value of value between to each pilot signal is less than the threshold value for setting；The N and M are positive integer,
And N is more than M, M is more than or equal to 1；
Step 202, N number of CDMA to be transmitted spread spectrum symbol and the M pilot signal are transmitted on the same timeslot.
It is preferred that above-mentioned threshold value could be arranged to forWherein L is the data overall length of N number of CDMA spread spectrums symbol
Degree is total length of data with M pilot signal and is worth, quantity of the M for pilot signal.Prior art biography as shown in Figure 1
The mode of defeated CDMA spread spectrum symbol, is 0 apart from the distance of Midamble nearest Sk or Sk+1, apart from Midamble farthest S1 or
The distance of S2k is about L/2, so in prior art, distance and the Sk or Sk+1 of S1 or S2k to pilot signal arrive pilot signal
The difference difference L/2 of distance, and adopts technical solution of the present invention, and the minimum of a value of M is 1, therefore, difference maximum i.e. L/4.
It is preferred that in above-mentioned steps 201, M pilot tone letter is inserted in the relevant position between N number of CDMA spread spectrums symbol to be transmitted
Number before, can also include the steps of：Each CDMA spread spectrums symbol to be transmitted is divided into into (M+1) part, successively by N number of 1/ (M+
1) CDMA spread spectrum symbol one sequence of composition, obtains (M+1) individual sequence.Now, the position between the adjacent sequence of any two
Put one pilot signal of insertion.
If inserting pilot signal in the manner described above, each CDMA spread spectrums symbol is to the mean value of the distance of each pilot signal
Difference is can consider substantially as 0.
A specific example can specifically be lifted to illustrate, it is assumed that have 2k CDMA spread spectrums symbol to be transmitted, respectively with S1,
S2 ..., Sk ..., S2k represent that now, S1～S2k can be averagely divided into length identical 2 parts respectively, such as S1 averagely draws
It is divided into S1-1 and S1-2, S2 are averagely divided into S2-1 and S2-2 ..., S2k is averagely divided into S2k-1 and S2k-2, wherein S1-1,
S2-1 ..., Sk-1 ..., S2k-1 constitute First ray, S1-2, S2-2 ..., Sk-2 ..., S2k-2 constitute the second sequence,
Position insertion pilot signal (such as insertion Midamble codes) between First ray and the second sequence, i.e., in First ray
Position insertion Midamble codes between the S1-2 of S2k-1 and the second sequence.
The embodiment of the present invention is not limited in as shown in figure 3, be only inserted a Midamble, can also be multiple, such as Fig. 4
It is shown, it is assumed that to have 4 CDMA spread spectrums symbols to be transmitted, represented with S1, S2, S3 and S4 respectively, can divide S1～S4 average respectively
For 4 parts of length identical, such as S1 is averagely divided into S1-1, S1-2, S1-3 and S1-4, and S2 is averagely divided into S2-1, S2-2, S2-3
S2k-1, S2k-2, S2k-3 and S2k-4 are divided into averagely with S2-4 ..., S2k, wherein S1-1, S2-1, S3-1 and S4-1 is constituted
First ray, S1-2, S2-2, S3-2 and S4-2 constitute the second sequence, and S1-3, S2-3, S3-3 and S4-3 constitute the 3rd sequence,
S1-4, S2-4, S3-4 and S4-4 constitute the 4th sequence；Again between two sequences of arbitrary neighborhood insert a Midamble,
Position such as between First ray and the second sequence, the position between the second sequence and the 3rd sequence, the 3rd sequence and the 4th
A Midamble is inserted respectively in position between sequence.
It is preferred that the channel estimation of CDMA spread spectrums symbol on same time slot is improved on the whole, to improve cdma system performance
While, be reduce pilot signal expense, save resources, in the embodiment of the present invention, generally, above-mentioned M values be 1.
Correspondingly, the embodiment of the present invention is additionally provided in the method flow diagram that network side receives CDMA spread spectrum symbols, as shown in figure 5, including：
CDMA spread spectrums symbol N number of to be transmitted and M pilot tone letter that step 501, on the same timeslot receive user terminal send
Number, the M pilot signal is inserted in the position between N number of CDMA spread spectrums symbol to be transmitted, and each CDMA spread spectrums to be transmitted
Accord with the threshold value of the distance difference and the mean value of value between less than setting of each pilot signal；The N and M are just whole
Number, and N is more than M, M is more than or equal to 1；
Step 502, N number of pilot signal position corresponding channel letter is determined according to N number of pilot signal
Breath；
The channel information that step 503, basis are determined, accords with the corresponding channel in position from N number of CDMA spread spectrums
Recover corresponding CDMA spread spectrums symbol.
In said method flow process, N number of pilot signal that step 501 is received averagely is divided respectively (M+1) part, and N number of
CDMA spread spectrum symbol one sequence of composition of 1/ (M+1), including (M+1) individual sequence；And the position between the adjacent sequence of any two
Put and be inserted with a pilot signal (such as Midamble)；Fig. 3 and Fig. 4 is can be found in specifically.
The threshold value is set toWherein L is the total length of data and M pilot tone letter of N number of CDMA spread spectrums symbol
Number it is total length of data and value, the M for pilot signal quantity.
Based on the transmission method of the CDMA spread spectrum symbols shown in aforementioned Fig. 2, the embodiment of the present invention also provides a kind of transmission CDMA
Spread spectrum symbol device, the structure of the device as shown in Figure 6A, including：
Pilot plug-in unit 61 is for inserting M pilot signal and each to be passed between N number of CDMA spread spectrums symbol to be transmitted
Defeated CDMA spread spectrums symbol is less than the threshold value of setting to the distance difference and the mean value of value between of each pilot signal；The N and M
Positive integer is, and N is more than M, M is more than or equal to 1；
Transmitting element 62, for transmitting N number of CDMA spread spectrums symbol to be transmitted and M pilot tone letter on the same timeslot
Number.
It is preferred that said apparatus may also include spread spectrum symbol signal generating unit 63, as shown in Figure 6B, wherein：
Spread spectrum symbol signal generating unit 63, for each CDMA spread spectrums symbol to be transmitted is divided into (M+1) part, successively will be N number of
CDMA spread spectrum symbol one sequence of composition of 1/ (M+1), obtains (M+1) individual sequence；
The pilot plug-in unit 61, specifically for any two generated in the spread spectrum symbol signal generating unit 63 is adjacent
Sequence between position insert a pilot signal (such as Midamble codes).
The threshold value is set toWherein L is the total length of data and M pilot tone letter of N number of CDMA spread spectrums symbol
Number it is total length of data and value, the M for pilot signal quantity.
Based on the method for the reception CDMA spread spectrum symbols shown in aforementioned Fig. 5, the embodiment of the present invention also provides a kind of reception CDMA
The device of spread spectrum symbol, the structure of the device as shown in fig. 7, comprises：
Receiving unit 71, the CDMA spread spectrums symbol N number of to be transmitted and M sent for receive user terminal on the same timeslot are individual
Pilot signal, the M pilot signal are inserted in the position between N number of CDMA spread spectrums symbol to be transmitted, and each to be transmitted
CDMA spread spectrums symbol is less than the threshold value of setting to the distance difference and the mean value of value between of each pilot signal；The N and M are equal
For positive integer, and N is more than M, and M is more than or equal to 1；
Channel estimating unit 72, the described N number of pilot signal for being received according to the receiving unit 71 determine institute
State the corresponding channel information in N number of pilot signal position；
Recovery unit 73, for the channel information determined according to the channel estimating unit 72, expands from N number of CDMA
Corresponding CDMA spread spectrums symbol is recovered in the corresponding channel in frequency symbol position.
It is preferred that each CDMA spread spectrums symbol to be transmitted is averagely divided into (M+1) part, and the CDMA spread spectrum symbols of N number of 1/ (M+1)
One sequence of composition, obtains (M+1) individual sequence；Position between the adjacent sequence of any two is inserted with a pilot signal
(such as Midamble codes).
The threshold value is set toWherein L is the total length of data and M pilot tone letter of N number of CDMA spread spectrums symbol
Number it is total length of data and value, the M for pilot signal quantity.
In the embodiment of the present invention, on the one hand, be inserted between the CDMA spread spectrums symbol N number of to be transmitted for transmitting on the same timeslot
M pilot signal, and each CDMA spread spectrums symbol to be transmitted is little to the distance difference and the mean value of value between of each pilot signal
In the threshold value of setting；The N and M are positive integer, and N is more than M, and M is more than or equal to 1；Therefore, using the technology of the present invention side
Case, as the difference of each CDMA spread spectrums symbol to be transmitted to the mean value of the distance of each pilot signal is less than the threshold value for setting, therefore,
The channel information that can be determined according to pilot signal is estimated carrying out channel to the corresponding channel in each CDMA spread spectrums symbol position
Meter more accurately, improves the channel estimation of the CDMA spread spectrum symbols on same time slot, on the whole so as to improve cdma system
Performance；On the other hand, can also be and each CDMA spread spectrums symbol to be transmitted is divided into into (M+1) part, successively by N number of 1/ (M+1)
CDMA spread spectrum symbol composition one sequence, obtain (M+1) individual sequence；Relevant position between N number of CDMA spread spectrums symbol to be transmitted
M pilot signal of insertion, specifically includes：A pilot signal is inserted in position between the adjacent sequence of any two, therefore,
So that each CDMA spread spectrums symbol is basically identical to the mean value of the distance of each pilot signal, so as to further improve on the whole
The channel estimation of CDMA spread spectrums symbol on same time slot, also, above-mentioned M values can be flexibly chosen according to practical application, so that
Obtain implementation more flexible.
Obviously, those skilled in the art can carry out the essence of various changes and modification without deviating from the present invention to the present invention
God and scope.So, if these modifications and modification to the present invention belong to the model of the claims in the present invention and its equivalent technologies
Within enclosing, then the present invention is also intended to comprising these changes and modification.
Claims (8)
1. a kind of method that transmission CDMA CDMA spread spectrums are accorded with, it is characterised in that include：
Each CDMA spread spectrums symbol to be transmitted is divided into into (M+1) part, successively by the CDMA spread spectrum symbols composition one of N number of 1/ (M+1)
Individual sequence, obtains (M+1) individual sequence, and numbers of the M for pilot signal, the N and M are positive integer, and N is more than M, and M is big
In or be equal to 1；
Insert a pilot signal in position between the adjacent sequence of any two；
N number of CDMA spread spectrums symbol to be transmitted and the M pilot signal are transmitted on the same timeslot.
2. the method for claim 1, it is characterised in that the pilot signal is Midamble codes.
3. it is a kind of to receive the method that CDMA CDMA spread spectrums are accorded with, it is characterised in that to include：
Receive user terminal sends on the same timeslot CDMA spread spectrums symbol N number of to be transmitted and M pilot signal, each is to be transmitted
CDMA spread spectrum symbols are averagely divided into (M+1) part, and CDMA spread spectrum symbol one sequence of composition of N number of 1/ (M+1), obtain (M+1) individual
Sequence, the position between the adjacent sequence of any two are inserted with a pilot signal；The N and M are positive integer, and N is big
In M, M is more than or equal to 1；
The corresponding channel information in the M pilot signal position is determined according to the M pilot signal, and according to determination
The channel information for going out, accords with from N number of CDMA spread spectrums and corresponding CDMA spread spectrums symbol is recovered in the corresponding channel in position.
4. method as claimed in claim 3, it is characterised in that the pilot signal is Midamble codes.
5. the device that a kind of transmission CDMA CDMA spread spectrums are accorded with, it is characterised in that include：
Spread spectrum symbol signal generating unit, for each CDMA spread spectrums symbol to be transmitted is divided into (M+1) part, successively by N number of 1/ (M+1)
CDMA spread spectrum symbol one sequence of composition, obtain (M+1) individual sequence, numbers of the M for pilot signal, the N and M are just
Integer, and N is more than M, M is more than or equal to 1；
Pilot plug-in unit, inserts a pilot signal for the position between the adjacent sequence of any two；
Transmitting element, for transmitting N number of CDMA spread spectrums symbol to be transmitted and the M pilot signal on the same timeslot.
6. device as claimed in claim 5, it is characterised in that the pilot signal is Midamble codes.
7. it is a kind of to receive the device that CDMA CDMA spread spectrums are accorded with, it is characterised in that to include：
Receiving unit, the CDMA spread spectrums symbol N number of to be transmitted sent for receive user terminal on the same timeslot and M pilot tone letter
Number, each CDMA spread spectrums symbol to be transmitted is averagely divided into (M+1) part, and CDMA spread spectrum symbol one sequence of composition of N number of 1/ (M+1)
Row, obtain (M+1) individual sequence, and the position between the adjacent sequence of any two is inserted with a pilot signal；The N and M are equal
For positive integer, and N is more than M, and M is more than or equal to 1；
Channel estimating unit, the M pilot signal for being received according to the receiving unit determine the M pilot tone
The corresponding channel information in signal position；
Recovery unit, for the channel information determined according to the channel estimating unit, is located from N number of CDMA spread spectrums symbol
Corresponding CDMA spread spectrums symbol is recovered in the corresponding channel in position.
8. device as claimed in claim 7, it is characterised in that the pilot signal is Midamble codes.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1473408A (en) * | 2001-07-31 | 2004-02-04 | ���µ�����ҵ��ʽ���� | Radio communication apparatus and radio communication method |
| CN101729158A (en) * | 2008-10-22 | 2010-06-09 | 中兴通讯股份有限公司 | Method and system estimating common-frequency multi-cell joint channels |
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| CN1473408A (en) * | 2001-07-31 | 2004-02-04 | ���µ�����ҵ��ʽ���� | Radio communication apparatus and radio communication method |
| CN101729158A (en) * | 2008-10-22 | 2010-06-09 | 中兴通讯股份有限公司 | Method and system estimating common-frequency multi-cell joint channels |
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