CN102281228A - Method for inhibiting peak-to-average power ratio (PAPR), transmitter and receiving device - Google Patents
Method for inhibiting peak-to-average power ratio (PAPR), transmitter and receiving device Download PDFInfo
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- CN102281228A CN102281228A CN2011102413490A CN201110241349A CN102281228A CN 102281228 A CN102281228 A CN 102281228A CN 2011102413490 A CN2011102413490 A CN 2011102413490A CN 201110241349 A CN201110241349 A CN 201110241349A CN 102281228 A CN102281228 A CN 102281228A
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Abstract
The invention discloses a method for inhibiting a peak-to-average power ratio (PAPR), a transmitter and a receiving device. The method comprises that: a base station selects components from random phase sequence vectors, wherein the components are used as expansion factors of the random phase sequence vectors, the expansion factors form sets Su, and the base station selects different sets Su for the random phase sequence vectors; when the base station generates an output sequence, the energy of the expansion factors of the random phase sequence vectors is different from the energy of other components beyond the expansion factors; and the base station selects a transmitting sequence from the output sequence, and transmits the transmitting sequence to a receiving end. By the method, the inhibiting effect of the PAPR is improved; and on the premise that the inhibiting effect of the PAPR is not degenerated, the severe condition that sideband information must be transmitted in a traditional selective mapping (SLM) algorithm is overcome.
Description
Technical field
The present invention relates to cordless communication network, relate in particular to a kind of inhibition method, transmitter and receiving system of peak-to-average ratio.
Background technology
In follow-on broadband wireless communication network, how to solve in the cordless communication network and to support bigger bandwidth to become a key factor that improves inter-cell user terminal throughput and user terminal average throughput under the bandwidth in current wireless communication system and be faced with formidable challenges.OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is a kind of special multi-carrier transmission technology, because its anti-multipath decline ability is strong, the availability of frequency spectrum is high, so be particularly suitable for the wideband transmit in the wireless channel.
In recent years, the OFDM technology has obtained being extensive use of in radio communication, as DVB-T, DAB, indoor wireless networks (IEEE802.11a/g, HIPERLAN/2) and broadband wireless access (IEEE802.16) etc.In the research of B3G mobile communication, OFDM is considered to a kind of key technology that has very much development prospect.
But (Peak-to-Average Power Ratio, PAPR) higher is a major defect of OFDM technology to the peak-to-average ratio of transmitting terminal signal transmitted.High peak-to-average ratio greatly reduces the power efficiency of radio frequency amplifier, and the range of linearity of existing amplifier is had higher requirement, and this has just increased the realization difficulty and the cost of system.If signal enters the amplifier nonlinearity zone, just may cause signal to produce the distortion distortion, make and produce Intermodulation Interference and out-of-band radiation between subcarrier, thereby destroyed the orthogonality between the subcarrier, and then the error rate when receiving is improved, therefore, how to reduce PAPR and become one of key technology of effective application OFDM.
At present, the Long Term Evolution of third generation partner program (Long Term Evolution LTE) proposes SLM (Selective Mapping, selectivity mapping) peak-to-average ratio and suppresses algorithm in the technology, in the SLM algorithm, the random phase sequence of vectors p of employing
(m)Be that one group of mould value is 1 phase vectors, get the peak-to-average ratio minimum in M group comprises the message sequence of identical information one group transmits.
The necessary transmitted sideband information of existing SLM algorithm, just can make receiving terminal correctly demodulate former message sequence, but, in some transmission standards, be not used for transmitting the headspace of side information, such as, the TD-LTE standard, its frame structure standard has determined side information can't transmit at all, in this case, can't use the SLM algorithm to suppress the peak-to-average ratio of OFDM.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of inhibition method, transmitter and receiving system of peak-to-average ratio, can make transmitting terminal need not transmitted sideband information, and receiving terminal also can demodulate former message sequence.
For solving the problems of the technologies described above, the inhibition method of a kind of peak-to-average ratio of the present invention comprises:
Component is chosen in the base station from each random phase sequence of vectors, as the spreading factor of this random phase sequence of vectors, described spreading factor is formed S set
u, different S set is chosen for each random phase sequence of vectors in described base station
u
Described base station is when producing output sequence, and the energy that the energy of spreading factor of random phase sequence of vectors and other components outside the described spreading factor are set is inequality;
Described base station is selected to send sequence from described output sequence, and described transmission sequence is sent to receiving terminal.
Further, also comprise:
After described receiving terminal receives described transmission sequence,, determine S according to the energy of the component of described transmission sequence
u, according to described S
uDetermine the random phase sequence of vectors of described transmission sequence correspondence, realize described transmission sequence is carried out demodulation.
Further, the mould value of the component that described base station is chosen from each random phase sequence of vectors is set to constant (C, C＞1), and as described spreading factor, when producing described output sequence, the energy that the spreading factor of described random phase sequence of vectors is set is C
2
Further, the mould value of the component outside the component of the described spreading factor of conduct that described base station is chosen from each random phase sequence of vectors is set to normal value 1, when producing described output sequence, the energy of the component outside the spreading factor of described random phase sequence of vectors is set to 1.
Further, described receiving terminal is determined S according to the energy of the component of described transmission sequence
uStep comprise:
After described receiving terminal receives described transmission sequence, search energy and be not 1 component, determine described S
u, wherein, the energy of described transmission sequence is not the sequence number of 1 component, is described S
uIn the sequence number of element.
Further, also comprise:
After described receiving terminal receives described transmission sequence, calculate the average energy of the transmission sequence receive, and employing M (M＞1) individual random phase sequence of vectors generation M output sequence identical, calculate the average energy of a described M output sequence with the base station;
Described receiving terminal deducts the average energy of described output sequence and the average energy of noise with the average energy of the described transmission sequence that receives, and obtains M average energy difference;
Described receiving terminal is chosen minimum average energy difference, with the random phase sequence of vectors of the output sequence of the average energy difference correspondence of described minimum random phase sequence of vectors, the described transmission sequence that receives is carried out demodulation as the transmission sequence that receives.
Further, the transmission sequence that receives of described receiving terminal is y
n=h
nX
V, n+ n
n, wherein, x
V, nBe list entries, h
nBe channel matrix, n
nBe noise, the average energy that described receiving terminal is got the transmission sequence that receives is E[|y
n|
2]=| h
n|
2| b
V, n|
2γ+σ
2, wherein, | h
n|
2Be the energy of channel matrix, | b
V, n|
2Be the energy of the characteristic vector that comprises phase information, γ is x
V, nAverage energy, σ
2Average energy for noise.
Further, a kind of transmitter comprises: spreading factor selected cell, output sequence generation unit and sequence selection unit and sequence transmitting element, wherein:
Described spreading factor selected cell is used for choosing component from each random phase sequence of vectors, and as the spreading factor of this random phase sequence of vectors, described spreading factor is formed S set
u, the S set that described base station is chosen for each random phase sequence of vectors
uAll inequality;
Described output sequence generation unit is used to produce output sequence, and the energy that the energy of spreading factor of random phase sequence of vectors and other components outside the described spreading factor are set is inequality;
Described sequence selection unit is used for selecting to send sequence from described output sequence;
Described sequence transmitting element is used for described transmission sequence is sent to receiving terminal.
Further, described spreading factor selected cell is that the mould value of the component chosen from each random phase sequence of vectors is set to constant (C, C＞1), as described spreading factor;
Described output sequence generation unit is when producing described output sequence, and the energy that the spreading factor of described random phase sequence of vectors is set is C
2
Further, described spreading factor selected cell is that the mould value of choosing from each random phase sequence of vectors as the component outside the component of described spreading factor is set to normal value 1;
Described output sequence generation unit is when producing described output sequence, and the energy of the component outside the spreading factor of described random phase sequence of vectors is set to 1.
Further, a kind of receiving system is characterized in that, comprising: output sequence generation unit, average energy computing unit, energy difference computational unit and demodulating unit, wherein:
Described output sequence generation unit is used to adopt the individual random phase sequence of vectors of the M identical with the base station (M＞1) to generate M output sequence;
Described average energy computing unit is used to calculate the average energy of the transmission sequence that receives and the average energy of a described M output sequence;
Described energy difference computational unit is used for the average energy of the described transmission sequence that receives is deducted the average energy of described output sequence and the average energy of noise, obtains M average energy difference, chooses minimum average energy difference;
Described demodulating unit is used for the random phase sequence of vectors of the output sequence of the average energy difference correspondence of the described minimum random phase sequence of vectors as the transmission sequence that receives is carried out demodulation to the described transmission sequence that receives.
Further, described transmission sequence is y
n=h
nX
V, n+ n
n, wherein, x
V, nBe list entries, h
nBe channel matrix, n
nBe noise, the average energy that described average energy computing unit is got the transmission sequence that receives is E[|y
n|
2]=| h
n|
2| b
V, n|
2γ+σ
2, wherein, | h
n|
2Be the energy of channel matrix, | b
V, n|
2Be the energy of the characteristic vector that comprises phase information, γ is x
V, nAverage energy, σ
2Average energy for noise.
In sum, the present invention has following beneficial effect:
(1) minimum value of receiving terminal by the difference of average energy relatively demodulates phase sequence among the present invention, and drawing does not need the SLM of transmitted sideband information algorithm;
(2) the inhibition effect of peak-to-average ratio improves;
(3) suppressing effect at peak-to-average ratio does not have to deteriorate to cost with the very little error rate under the prerequisite of degeneration, has overcome these harsh conditions of the necessary transmitted sideband information of traditional SLM algorithm.
Description of drawings
Fig. 1 is the method for inhibiting peak-to-average ratio transmitting terminal realization flow figure of the boundless breath of taking a message of the present invention;
Fig. 2 is the method for inhibiting peak-to-average ratio receiving terminal realization flow figure of the boundless breath of taking a message of the present invention;
Fig. 3 realizes block diagram for the method for inhibiting peak-to-average ratio transmitting terminal of the boundless breath of taking a message of the present invention;
Fig. 4 suppresses the effect comparison diagram for the method for inhibiting peak-to-average ratio PAR of the boundless breath of taking a message of the present invention;
Fig. 5 is the method for inhibiting peak-to-average ratio error rate comparison diagram of the boundless breath of taking a message of the present invention.
Embodiment
Present SLM algorithm is to produce M the random phase sequence of vectors that length is N by the base station, and M random phase sequence of vectors is expressed as:
I=1,2 ..., N, wherein, m is the sequence number of random phase sequence of vectors, and M is the sum of random phase sequence of vectors, and i is the component corresponding sequence number in the random phase sequence of vectors, and N is the maximum number of phase sequence component,
It is the generation formula of random phase sequence of vectors; After producing M random phase sequence of vectors, M random phase sequence of vectors carried out dot product with the list entries X of IFFT (inversefouriertransform) respectively, obtain the different output sequence of M, M output sequence carried out IFFT, select the best output sequence of peak-to-average ratio performance to be used for transmission as sending sequence.
Present embodiment considers that the SLM algorithm need transmit side information and just can make receiving terminal correctly demodulate former message sequence, side information is used to indicate receiving terminal to send the random phase sequence of vectors of sequence correspondence, and being not used in the headspace that transmits side information for some transmission systems, this just causes the peak-to-average ratio that can't use the SLM algorithm to reduce OFDM in these systems.
Present embodiment is by being provided with S one to one for each random phase sequence of vectors
u, S
uIn comprise K component, in generating the process of output sequence, with S
uIn the energy of element be set to the mould value square; Receiving terminal is determined S according to the ability of the component that sends sequence
u, according to S
uWith the one-to-one relationship of random phase sequence of vectors, determine to send the random phase sequence of vectors of sequence, carry out demodulation to sending sequence, under the situation of transmitted sideband information not, receiving terminal has been realized sending the demodulation of sequence.
Below in conjunction with accompanying drawing present embodiment is elaborated.
Fig. 1 is the inhibition method of the peak-to-average ratio of the boundless breath of taking a message of present embodiment, comprising:
Step 101: the base station is to each random phase sequence of vectors p
(m), in N component of this random phase sequence of vectors, choose K component, the mould value of K component choosing is made as constant C, C＞1, selected component is called spreading factor;
For each random phase sequence of vectors p
(m), for K the component that this random phase sequence of vectors is chosen formed S set
u, S
uIn comprise K element.
For example, select for certain random phase sequence of vectors
With
As spreading factor, this random phase sequence of vectors then
Expression random phase sequence of vectors p
(m)In at i=1,33,47,63 o'clock, the mould value of element was C, that is: | p
i (m)|=C.
For making receiving terminal can know the random phase sequence of vectors that sends the sequence correspondence, the base station is being that each random phase sequence of vectors selects spreading factor to form S
uThe time, need select different S for each random phase sequence of vectors
u, make random phase sequence of vectors and S
uHas relation one to one.
Step 102: the base station is made as normal value 1 with the mould value of choosing in the random phase sequence of vectors as the component of the N-K outside the component of spreading factor;
K is the quantity of the spreading factor chosen for the random phase sequence of vectors; C is the mould value that is provided with for K the component of choosing; N-K is the quantity of the component that is not selected, and the mould value of the component that all are not selected is fixed as 1.
Step 103: the base station produces the phase place of random phase sequence of vectors at random;
p
(m)Phase place the same with traditional SLM algorithm, be provided with at random.
Step 104: dot product is carried out with the list entries X of IFFT respectively with M random phase sequence of vectors in the base station, obtains M different output sequence Y
(m)
Step 105: the base station is when producing output sequence, and the energy that the spreading factor of random phase sequence of vectors is set is C
2, the energy of the component of other beyond the spreading factor of random phase sequence of vectors is 1;
Each average energy that sends symbol is bigger than the average energy of former message sequence, because | x
U, n|=| b
U, n|| x
n|, and | b
U, n|=1 or C, this means E[|x
U, n|
2]＞E[|x
n|
2], E[wherein] expression gets desired value.
Step 107: the output sequence of base station selected peak-to-average ratio minimum will send sequence and be transmitted to receiving terminal as sending sequence;
Step 108: after receiving terminal receives and sends sequence, search energy and be not 1 component, determine S
u, according to S
uWith p
(m)One-to-one relationship, determine to send the p of sequence correspondence
(m), according to p
(m)Demodulated sequence.
The energy that sends sequence is not the sequence number of 1 component, just S
uIn the sequence number of element, determine S
uAfter, according to S
uWith p
(m)One-to-one relationship, can determine the random phase sequence of vectors of output sequence correspondence.
As shown in Figure 2, present embodiment provides another receiving terminal demodulation to send the method for sequence, comprising:
Step 201: receiving terminal receives the transmission sequence that the base station sends, and the transmission sequence that receiving terminal receives is y
n
The receive channel of supposing receiving terminal is the white Gaussian noise channel, and thinks that receiving terminal carries out Synchronous Processing under perfect condition, and then the transmission sequence that receives of receiving terminal is:
y
n＝h
n·x
v，n+n
n (2)
Wherein, x
V, nBe list entries, h
nBe channel matrix, n
nBe noise.
Step 202: receiving terminal carries out dot product with the list entries of FFT respectively with M random phase sequence of vectors, obtains M output sequence;
Step 203: receiving terminal calculates the average energy of M output sequence respectively;
Step 204: receiving terminal calculates the average energy of the transmission sequence that receives;
Receiving terminal is according to E[|y
n|
2] ≈ | y
n|
2The average energy of the signal that calculating receives obtains:
E[|y
n|
2]＝|h
n|
2|b
v，n|
2γ+σ
2 (3)
Wherein, | h
n|
2Be the energy of channel matrix, | b
V, n|
2Be the energy of the characteristic vector that comprises phase information, γ is x
V, nAverage energy, σ
2Average energy for noise.
Step 205: the average energy of the transmission sequence that receiving terminal will receive deducts the average energy of output sequence and the average energy of noise, obtains M average energy difference;
Receiving terminal is got α
U, n=| E[|y
n|
2]-σ
2-| h
n|
2| b
U, n|
2γ |, wherein, α
U, nBe the difference of average energy, E[|y
n|
2] average energy of the signal that receives for receiving terminal, | h
n|
2| b
U, n|
2γ is the average energy of the output sequence that calculates of receiving terminal, σ
2Average energy for noise.
By (3) E[|y as can be known
n|
2]=| h
n|
2| b
V, n|
2γ+σ
2, substitution formula (4) can obtain:
α
u，n＝|h
n|
2γ||b
v，n|
2-|b
u，n|
2| (5)
Step 206: receiving terminal is chosen minimum average energy difference α
U, n, minimum α
U, nThe random phase sequence of vectors of corresponding output sequence is the random phase sequence of vectors of the transmission sequence correspondence that receiving terminal receives;
Because average energy difference α
U, nThe difference of the average energy of the average energy of the signal that receives for receiving terminal and the average energy of output sequence certificate and noise, α
U, nMinimum value be 0 obviously, work as α
U, n=0 o'clock, obtain | b
V, n|=| b
U, n|, promptly the energy of the characteristic vector in the signal that receives of receiving terminal is identical with the energy of the characteristic vector of the output sequence that calculates, and still, by the transmission of channel, both must there are differences, and therefore, determine minimum average energy difference α
U, nThe random phase sequence of vectors of corresponding output sequence is the random phase sequence of vectors of the signal correspondence that receives of receiving terminal.
Step 207: receiving terminal adopts minimum α
U, nThe random phase sequence of vectors of corresponding output sequence is carried out demodulation to the output sequence that receives.
In addition, when reality is used, need determine at random phase random sequence p
(m)In, the mould value of which K position is taken as the value of constant C and K.Suppose M=8, with p
(m)Random division is a J subvector, p
I, jRepresent (i+1) the individual element in (j+1) individual subvector.In each subvector, the mould value of getting K element is C, and the mould value of other (I-K) individual element is 1.At p
I, jIn, which | p
I, j|=C and j are irrelevant, and be only relevant with the value of i, therefore, works as p
(m)The position of spreading factor of first subvector determine after, the spreading factor position in the individual subvector in back (J-1) has also just been determined.Phase factor is counted M=8, so in order to guarantee the heterogeneite of each phase factor, must make
Therefore the minimum value of I is 5, and the minimum value of k is 2.If M=4, the minimum value of I is 4 so, and the minimum value of k is 1.
Figure 3 shows that the structure chart of the transmitter of present embodiment, comprising: spreading factor selected cell, output sequence generation unit and sequence selection unit and sequence transmitting element, wherein:
The spreading factor selected cell is used for choosing component from each random phase sequence of vectors, and as the spreading factor of this random phase sequence of vectors, spreading factor is formed S set
u, the S set that the base station is chosen for each random phase sequence of vectors
uAll inequality.
The spreading factor selected cell is that the mould value of the component chosen from each random phase sequence of vectors is set to constant (C, C＞1), as spreading factor; The mould value of choosing from each random phase sequence of vectors as the component outside the component of spreading factor is set to normal value 1.
The output sequence generation unit is used to produce output sequence, and the energy that the energy of spreading factor of random phase sequence of vectors and other components outside the spreading factor are set is inequality.
The output sequence generation unit is when producing output sequence, and the energy that the spreading factor of random phase sequence of vectors is set is C
2The energy of the component outside the spreading factor of random phase sequence of vectors is set to 1.
The sequence selection unit is used for selecting the output sequence of peak-to-average ratio minimum as sending sequence from output sequence.
The sequence transmitting element is used for the transmission sequence is sent to receiving terminal.
Present embodiment also provides a kind of receiving system, comprising: output sequence generation unit, average energy computing unit, energy difference computational unit and demodulating unit, wherein:
The output sequence generation unit is used to adopt the individual random phase sequence of vectors of the M identical with the base station (M＞1) to generate M output sequence;
The average energy computing unit is used to calculate the average energy of the transmission sequence that receives and the average energy of a described M output sequence;
The energy difference computational unit is used for the average energy of the described transmission sequence that receives is deducted the average energy of described output sequence and the average energy of noise, obtains M average energy difference, chooses minimum average energy difference;
Demodulating unit is used for the random phase sequence of vectors of the output sequence of the average energy difference correspondence of the described minimum random phase sequence of vectors as the transmission sequence that receives is carried out demodulation to the described transmission sequence that receives.
The transmission sequence is y
n=h
nX
V, n+ n
n, wherein, x
V, nBe list entries, h
nBe channel matrix, n
nBe noise, the average energy that described average energy computing unit is got the transmission sequence that receives is E[|y
n|
2]=| h
n|
2| b
V, n|
2γ+σ
2, wherein, | h
n|
2Be the energy of channel matrix, | b
V, n|
2Be the energy of the characteristic vector that comprises phase information, γ is x
V, nAverage energy, σ
2Average energy for noise.
Fig. 4 suppresses the effect comparison diagram for the method for inhibiting peak-to-average ratio PAR of the boundless breath of taking a message of the present invention.Fig. 5 is the method for inhibiting peak-to-average ratio error rate comparison diagram of the boundless breath of taking a message of the present invention.As can be seen from the figure:
Adopted do not need the improvement SLM of transmitted sideband information algorithm after, the inhibition effect of PAR does not only descend, and also has small improvement.
In improving the SLM algorithm, its bit error rate performance has a little degeneration, but bit error rate performance difference is little on the whole.Come institute from principle in fact, the reason that why produces the bit error rate performance degeneration is: when receiving terminal comes the demodulation side information according to the difference of average energy, used E[|y
n|
2] ≈ | y
n|
2This estimated value, E[|y
n|
2] use of this estimated value just may cause side information demodulation mistake, thereby cause the degeneration of bit error rate performance.
Adopted and do not needed the improvement SLM of transmitted sideband information algorithm, improved under the prerequisite that does not have on the effect to degenerate at PAR, deteriorated to cost with the very little error rate, having overcome traditional SLM algorithm must these harsh conditions of transmitted sideband information.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the inhibition method of a peak-to-average ratio comprises:
Component is chosen in the base station from each random phase sequence of vectors, as the spreading factor of this random phase sequence of vectors, described spreading factor is formed S set
u, different S set is chosen for each random phase sequence of vectors in described base station
u
Described base station is when producing output sequence, and the energy that the energy of spreading factor of random phase sequence of vectors and other components outside the described spreading factor are set is inequality;
Described base station is selected to send sequence from described output sequence, and described transmission sequence is sent to receiving terminal.
2. the method for claim 1 is characterized in that, also comprises:
After described receiving terminal receives described transmission sequence,, determine S according to the energy of the component of described transmission sequence
u, according to described S
uDetermine the random phase sequence of vectors of described transmission sequence correspondence, realize described transmission sequence is carried out demodulation.
3. method as claimed in claim 2 is characterized in that:
The mould value of the component that described base station is chosen from each random phase sequence of vectors is set to constant (C, C＞1), and as described spreading factor, when producing described output sequence, the energy that the spreading factor of described random phase sequence of vectors is set is C
2
4. method as claimed in claim 3 is characterized in that:
The mould value of the component outside the component of the described spreading factor of conduct that described base station is chosen from each random phase sequence of vectors is set to normal value 1, when producing described output sequence, the energy of the component outside the spreading factor of described random phase sequence of vectors is set to 1.
5. method as claimed in claim 4 is characterized in that described receiving terminal is determined S according to the energy of the component of described transmission sequence
uStep comprise:
After described receiving terminal receives described transmission sequence, search energy and be not 1 component, determine described S
u, wherein, the energy of described transmission sequence is not the sequence number of 1 component, is described S
uIn the sequence number of element.
6. the method for claim 1 is characterized in that, also comprises:
After described receiving terminal receives described transmission sequence, calculate the average energy of the transmission sequence receive, and employing M (M＞1) individual random phase sequence of vectors generation M output sequence identical, calculate the average energy of a described M output sequence with the base station;
Described receiving terminal deducts the average energy of described output sequence and the average energy of noise with the average energy of the described transmission sequence that receives, and obtains M average energy difference;
Described receiving terminal is chosen minimum average energy difference, with the random phase sequence of vectors of the output sequence of the average energy difference correspondence of described minimum random phase sequence of vectors, the described transmission sequence that receives is carried out demodulation as the transmission sequence that receives.
7. method as claimed in claim 6 is characterized in that:
The transmission sequence that described receiving terminal receives is y
n=h
nX
V, n+ n
n, wherein, x
V, nBe list entries, h
nBe channel matrix, n
nBe noise, the average energy that described receiving terminal is got the transmission sequence that receives is E[|y
n|
2]=| h
n|
2| b
V, n|
2γ+σ
2, wherein, | h
n|
2Be the energy of channel matrix, | b
V, n|
2Be the energy of the characteristic vector that comprises phase information, γ is x
V, nAverage energy, σ
2Average energy for noise.
8. transmitter comprises: spreading factor selected cell, output sequence generation unit and sequence selection unit and sequence transmitting element, wherein:
Described spreading factor selected cell is used for choosing component from each random phase sequence of vectors, and as the spreading factor of this random phase sequence of vectors, described spreading factor is formed S set
u, the S set that described base station is chosen for each random phase sequence of vectors
uAll inequality;
Described output sequence generation unit is used to produce output sequence, and the energy that the energy of spreading factor of random phase sequence of vectors and other components outside the described spreading factor are set is inequality;
Described sequence selection unit is used for selecting to send sequence from described output sequence;
Described sequence transmitting element is used for described transmission sequence is sent to receiving terminal.
9. transmitter as claimed in claim 7 is characterized in that:
Described spreading factor selected cell is that the mould value of the component chosen from each random phase sequence of vectors is set to constant (C, C＞1), as described spreading factor;
Described output sequence generation unit is when producing described output sequence, and the energy that the spreading factor of described random phase sequence of vectors is set is C
2
10. transmitter as claimed in claim 8 is characterized in that:
Described spreading factor selected cell is that the mould value of choosing from each random phase sequence of vectors as the component outside the component of described spreading factor is set to normal value 1;
Described output sequence generation unit is when producing described output sequence, and the energy of the component outside the spreading factor of described random phase sequence of vectors is set to 1.
11. a receiving system is characterized in that, comprising: output sequence generation unit, average energy computing unit, energy difference computational unit and demodulating unit, wherein:
Described output sequence generation unit is used to adopt the individual random phase sequence of vectors of the M identical with the base station (M＞1) to generate M output sequence;
Described average energy computing unit is used to calculate the average energy of the transmission sequence that receives and the average energy of a described M output sequence;
Described energy difference computational unit is used for the average energy of the described transmission sequence that receives is deducted the average energy of described output sequence and the average energy of noise, obtains M average energy difference, chooses minimum average energy difference;
Described demodulating unit is used for the random phase sequence of vectors of the output sequence of the average energy difference correspondence of the described minimum random phase sequence of vectors as the transmission sequence that receives is carried out demodulation to the described transmission sequence that receives.
12. receiving system as claimed in claim 11 is characterized in that:
Described transmission sequence is y
n=h
nX
V, n+ n
n, wherein, x
V, nBe list entries, h
nBe channel matrix, n
nBe noise, the average energy that described average energy computing unit is got the transmission sequence that receives is E[|y
n|
2]=| h
n|
2| b
V, n|
2γ+σ
2, wherein, | h
n|
2Be the energy of channel matrix, | b
V, n|
2Be the energy of the characteristic vector that comprises phase information, γ is x
V, nAverage energy, σ
2Average energy for noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102413490A CN102281228A (en) | 2011-08-22 | 2011-08-22 | Method for inhibiting peak-to-average power ratio (PAPR), transmitter and receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102413490A CN102281228A (en) | 2011-08-22 | 2011-08-22 | Method for inhibiting peak-to-average power ratio (PAPR), transmitter and receiving device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040146115A1 (en) * | 2003-01-24 | 2004-07-29 | Chih-Chun Feng | Method and apparatus for protecting and transmitting the side information related to peak-to-average power ratio reduction in a multicarrier system |
| CN1703038A (en) * | 2004-05-25 | 2005-11-30 | 株式会社Ntt都科摩 | Transmitter and transmission control method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040146115A1 (en) * | 2003-01-24 | 2004-07-29 | Chih-Chun Feng | Method and apparatus for protecting and transmitting the side information related to peak-to-average power ratio reduction in a multicarrier system |
| CN1703038A (en) * | 2004-05-25 | 2005-11-30 | 株式会社Ntt都科摩 | Transmitter and transmission control method |
Non-Patent Citations (1)
| Title |
|---|
| LU XUAN-MIN等: "An Improved SLM Algorithm for PAPR Reduction in OFDM", 《2010 WASE INTERNATIONAL CONFERENCE ON INFORMATION ENGINEERING》 * |
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