CN1848835A - Method for transmitting signal of offset orthogonal amplitude modulation system - Google Patents

Method for transmitting signal of offset orthogonal amplitude modulation system Download PDF

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CN1848835A
CN1848835A CN 200510063494 CN200510063494A CN1848835A CN 1848835 A CN1848835 A CN 1848835A CN 200510063494 CN200510063494 CN 200510063494 CN 200510063494 A CN200510063494 A CN 200510063494A CN 1848835 A CN1848835 A CN 1848835A
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pilot sign
frequency pilot
interference signal
interference
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CN100512259C (en
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吴和兵
王吉滨
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Huawei Technologies Co Ltd
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Abstract

A method for emitting signal of offset orthogonal amplitude modulation system includes configuring real part interference signal and virtual part interference signal, selecting any one of data signal from two said interference signals, configuring emission value with the same absolute value for pilot frequency symbol real part and virtual part signal and configuring emission value of each other data signal in addition to selected signal on two said interference signals, confirming emission value condition to counterbalance interference generated by two said interference signals and confirming emission value of selected data signal.

Description

A kind of signal transmitting method of offset orthogonal amplitude modulation system
Technical field
The present invention relates to the transmitting terminal treatment technology of offset orthogonal amplitude modulation(PAM) (OQAM) system, particularly the signal transmitting method of OQAM system.
Background technology
At present, along with high speed data transmission service as the developing rapidly of digital audio broadcasting (DAB), digital television broadcasting (DVB), high-speed down data packet data transmission (HSDPA) etc., adopt bigger spectral bandwidth and come transmitting high speed data to become inevitable choice in conjunction with the high order modulation technology.Wherein, Chang Yong technology is exactly a multi-carrier transmission.OFDM (OFDM) system is the higher multicarrier transmission systems of a kind of spectrum efficiency.
In order to remove or to reduce the length at protection interval in traditional ofdm system and the quantity of virtual subnet carrier wave, further improve spectrum efficiency, produced the OQAM system based on traditional ofdm system.As everyone knows, the performance of any system all depends on reception technique to a great extent, and the estimation of propagation channel is again very important aspect in the OQAM system reception technique, thereby the accuracy that propagation channel is estimated is for guaranteeing that the OQAM systematic function is significant.Usually, the propagation channel estimation is to utilize from the pilot symbol signal of pilot channel reception to estimate, if therefore each signal of transmitting terminal emission can offset the interference that more pilot symbol signal are subjected to, the signal interference ratio that makes receiving terminal receive the pilot symbol signal that obtains improves, just can improve the accuracy that propagation channel is estimated, thereby improve the performance of OQAM system on the whole.
Below to estimating that with propagation channel relevant processing is described in the OQAM system.
At first, the equivalent base band transmit s (t) of transmitting terminal is as the formula (1):
s ( t ) = Σ n Σ m = 0 M - 1 a m , n i m + n e 2 jπm v 0 t g ( t - n τ 0 ) - - - ( 1 )
Wherein, t express time, a M, nIt is the ofdm signal that t modulates constantly.Here, m and n represent the transmitting site of ofdm signal frequency domain and time domain, and m is the frequency domain coordinate, and the expression channel indexes is the carrier wave at signal place, and n is the time domain coordinate, and the express time index is the signal period at signal place; τ 0The transmission duration that is an ofdm signal is the signal period, a M, nBe t=n τ 0Constantly be modulated at m the ofdm signal on the subcarrier, then the ofdm signal set representations of constantly being launched at t is =[a 0, n, a 1, n..., a M-1, n], m=0,1 ..., M-1, M are the channel number, n is an integer, ν 0Represent the carrier spacing between each signal, and satisfy ν 0τ 0=1/2.i M+nDoing the preceding additional in advance phase place of anti-fast fourier transform (IFFT) for each ofdm signal, purpose is in order to guarantee the orthogonality of unlike signal and interchannel.G (t) is the prototype function of real-valued filter, the basic function g of OQAM system M, n(t) can be expressed as g m , n ( t ) = i m + n e 2 jπm v 0 t g ( t - n τ 0 ) , This basic function g M, n(t) satisfied property of orthogonality as the formula (2):
Figure A20051006349400082
Wherein, m ' and n ' represent the transmitting site coordinate on another ofdm signal frequency domain and the time domain respectively, then should (m ', n ') position on the basic function of OFDM symbols transmitted be expressed as g M ', n '(t), * represents to get conjugation,
Figure A20051006349400083
Real is got in expression, The expression real number field, δ represents the Di Like symbol here.If make g M, n(t) satisfy as the formula (2) property of orthogonality, then should make the value δ of formula (2) M, m 'δ N, n 'Be zero.
Suppose parameter τ 0And ν 0Choose suitably, make that propagation channel all is the slow fading process on time and frequency, and the propagation channel coefficients H on each channel M, nBeing constant in the same signal period, is a multiple Gaussian random process on the cycle at unlike signal.So the equivalent baseband signal r (t) that receiving terminal receives is expressed as formula (3):
r ( t ) = Σ n Σ m = 0 M - 1 H m , n a m , n g m , n ( t ) + w ( t ) - - - ( 3 )
Wherein, W (t) expression white complex gaussian noise disturbs.
Receiving terminal is for the signal a of demodulation transmitting terminal emission M, n, the signal r (t) that receives need be projected to corresponding basic function g M, n(t) on, then r (t) projects to corresponding basic function g M, n(t) result who obtains on is as shown in the formula shown in (4):
Figure A20051006349400091
Figure A20051006349400092
(4)
Suppose
Figure A20051006349400093
For by suitable channel estimation methods to propagation channel coefficients H M, nThe estimation of making, then the ofdm signal a of transmitting terminal emission M, nBe detected as  at receiving terminal M, n:
Figure A20051006349400095
(5)
In the formula (5), the signal of other channel is to a M, nInterference I M0, n0, available formula (6) is represented:
Wherein, plural imaginary part is got in Im () expression.
In the OQAM system, the ofdm signal of launching on each channel position comprises: pilot symbol signal and data-signal.For mobile channel, utilize the known pilot symbols signal that is sent to carry out propagation channel usually and estimate that wherein, frequency pilot sign is a plural number, so the pilot symbol signal of actual transmission comprises: frequency pilot sign solid part signal and frequency pilot sign imaginary signals.Suppose channel position (m in frequency domain and time domain coordinate representation 0, n 0) signal of going up emission is frequency pilot sign solid part signal a M0, n0, this paper the following stated a M0, n0All represent the frequency pilot sign solid part signal, then receiving terminal should (m 0, n 0) the channel coefficients H of transmitting site M0, n0Be estimated as Be expressed as formula (7):
Figure A20051006349400098
From formula (7) as seen, I M0, n0And w M0, n0Will be to H M0, n0Estimation exert an influence.Because all there is noise item w in any system M0, n0, and can't eliminate w M0, n0To the interference that propagation channel is estimated, therefore can only be by reducing I M0, n0, promptly reduce frequency pilot sign solid part signal a M0, n0Other signal of launching on the transmitting site on every side is to a M0, n0Interference, reduce the interference of propagation channel in estimating.That is to say that the signal interference ratio by improving pilot symbol signal improves propagation channel coefficients H M0, n0The accuracy of estimating.The signal interference ratio of described pilot symbol signal can be used a M0, n0/ I M0, n0Express.
The quick fading characteristic of the filter that adopts according to the OQAM system as can be known, at channel coefficients H M0, n0During estimation, distracter I M0, n0Main contribution derive from frequency pilot sign solid part signal a M0, n0Transmitting site (m 0, n 0) each signal of launching on the transmitting site of adjacent one deck on every side, industry is usually with this frequency pilot sign solid part signal a M0, n0Transmitting site (m 0, n 0) each signal of launching on the transmitting site of adjacent one deck on every side is referred to as frequency pilot sign solid part signal a M0, n0The single order interference signal, the interference that this single order interference signal produces is called frequency pilot sign solid part signal a M0, n0Single order disturb.
Therefore, industry has proposed the signal transmitting method of a kind of OQAM system at present, and this method is mainly handled thought and is exactly: the emission value by in transmitting terminal configuration proper pilot symbol solid part signal single order interference signal makes frequency pilot sign solid part signal a M0, n0Single order to disturb be zero, thereby offset distracter I M0, n0In single order disturb and reduce I M0, n0To the propagation channel estimation effect.Below in conjunction with Fig. 1 and Fig. 2 prior art is handled and to be set forth.
Fig. 1 is the signal transmitting method handling process schematic diagram of existing OQAM system.As shown in Figure 1, the concrete processing comprises:
Step 101: configuration frequency pilot sign solid part signal a M0, n0The emission value and to frequency pilot sign solid part signal a M0, n0Form the emission value of each real part interference signal of disturbing.In the prior art, the single order interference signal of described frequency pilot sign solid part signal is decided to be the frequency pilot sign solid part signal is formed the real part interference signal of disturbing, then described real part interference signal comprises: frequency pilot sign solid part signal a M0, n0Transmitting site (m 0, n 0) the emission value of each data-signal of launching on adjacent on every side each transmitting site of one deck.
Fig. 2 is the schematic diagram that concerns between frequency pilot sign solid part signal and self the single order interference signal.As shown in Figure 2, black circle is represented frequency pilot sign solid part signal a M0, n0Transmitting site (m 0, n 0), this transmitting site (m 0, n 0) eight round dots in adjacent on every side one deck represent the transmitting site of each single order interference signal, their coordinate is respectively: (m 0-1, n 0-1), (m 0-1, n 0), (m 0-1, n 0+ 1), (m 0, n 0-1), (m 0, n 0+ 1), (m 0+ 1, n 0-1), (m 0+ 1, n 0), (m 0+ 1, n 0+ 1).Here, reference axis f represents each signal frequency-domain coordinate, and reference axis t represents the time domain coordinate of each signal, and the base unit that signal period duration is the time domain coordinate is τ 0, the carrier spacing between each signal is that the base unit of frequency domain coordinate is ν 0
As everyone knows, the transmitting site of frequency pilot sign imaginary signals and this frequency pilot sign solid part signal a M0, n0Transmitting site (m 0, n 0) adjacent, and (m shown in being 0, n 0) one of eight round dots in adjacent on every side one deck, this paper sets the round dot that the transmitting site of frequency pilot sign imaginary signals is filled for Fig. 2 bend, and coordinate is (m 0, n 0+ 1), frequency pilot sign imaginary signals described herein is all used a M0, n0+ 1 represents, that launches on other seven points in then described eight round dots is data-signal, and uses a respectively M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0And a M0, n0-1Represent each data-signal.
According to the relation of each data-signal of launching on adjacent one deck transmitting site around frequency pilot sign solid part signal shown in Figure 2, frequency pilot sign imaginary signals and the frequency pilot sign solid part signal transmitting site as can be known, described step 101 is specially: configuration frequency pilot sign solid part signal a M0, n0, and each data-signal a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0And a M0, n0-1The emission value.
Step 102: determine frequency pilot sign imaginary signals a M0, n0+1The emission value, make frequency pilot sign solid part signal a M0, n0Single order to disturb be zero, that is: make a M0, n0Each data-signal and the frequency pilot sign imaginary signals a that launch on each transmitting site of one deck around the transmitting site M0, n0+1To a M0, n0Interference be zero.
Described definite frequency pilot sign imaginary signals a M0, n0+1The derivation of emission value as follows:
Because, on the adjacent transmission position, propagation channel coefficients H M, nCan think constant approx.With described frequency pilot sign solid part signal a M0, n0Single order disturb and to be designated as Ω 1 M0, n0, formula (8) below utilizing and front formula (1) can be with frequency pilot sign solid part signal a to the described principle of formula (7) M0, n0The single order that is subjected to disturbs Ω 1 M0, n0Be expressed as following formula (9):
Ω 1 m 0 , n 0 ≈ j H m 0 , n 0 ( - 1 ) n 0 + 1 [ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 + 1 ) +
A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] (9)
Wherein,
Figure A20051006349400114
Ambiguity function for function g (t).
If Ω 1 m 0 , n 0 = 0 , Then derive according to formula (9):
A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 ) +
A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0 (10)
In the formula (10), A g(τ 0, ν 0) and A g(τ 0, 0) and be constant, but calculated in advance obtains.According to formula (10) as seen, utilize and frequency pilot sign solid part signal a M0, n0Transmitting site around the signal emission value on any seven points in eight points of adjacent one deck, can determine the signal emission value on the another one point, and the emission value of these eight signals to satisfy formula (10) described Ω 1 m 0 , n 0 = 0 Condition, if that is: launch this eight signals, can make frequency pilot sign solid part signal a by above-mentioned emission value M0, n0The single order that is subjected to disturbs Ω 1 M0, n0Be zero.
Therefore, this step is by the emission value of each data-signal on described seven points of configuration in the step 101, that is: a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0And a M0, n0-1The emission value, can determine in addition some frequency pilot sign imaginary signals a M0, n0+1The emission value, make Ω 1 M0, n0Be zero, offset frequency pilot sign solid part signal a thereby reach M0, n0Distracter I M0, n0Middle frequency pilot sign solid part signal a M0, n0The single order that is subjected to disturbs Ω 1 M0, n0Purpose.
Step 103: 101 frequency pilot sign solid part signal a that disposed set by step M0, n0Emission value and each data-signal a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0And a M0, n0-1The emission value, emission frequency pilot sign solid part signal a M0, n0, and each data-signal a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0And a M0, n0-1, and 102 determined frequency pilot sign imaginary signals a set by step M0, n0+1Emission value emission frequency pilot sign imaginary signals a M0, n0+1
According to formula (7), offseting frequency pilot sign solid part signal a M0, n0Single order disturb Ω 1 M0, n0After, receiving terminal uses the frequency pilot sign solid part signal a that receives M0, n0Signal value to channel coefficients H M0, n0Estimated statement be shown:
H ^ m 0 , n 0 = H m 0 , n 0 + I m 0 , n 0 \ Ω 1 m 0 , n 0 a m 0 , n 0 + w m 0 , n 0 a m 0 , n 0 - - - ( 11 )
Wherein, I M0, n0Ω 1 M0, n0Expression offsets frequency pilot sign solid part signal a M0, n0Single order disturb Ω 1 M0, n0Back frequency pilot sign solid part signal a M0, n0The residual interference that is subjected to.
According to above-mentioned processing as seen, transmitting terminal can only have been eliminated frequency pilot sign solid part signal a by method emission pilot symbol signal and each data-signal of prior art M0, n0The interference of single order interference signal on every side.And from formula (11) I m 0 , n 0 \ Ω 1 m 0 , n 0 a m 0 , n 0 + w m 0 , n 0 a m 0 , n 0 Partly as seen, the semaphore of pilot symbol signal is a M0, n0,
Then has only frequency pilot sign solid part signal a M0, n0The emission value really be used for propagation channel and estimate frequency pilot sign imaginary signals a M0, n0+1The emission value then sacrificed in offseting frequency pilot sign solid part signal a M0, n0In the processing that single order disturbs, thereby cause the Signal to Interference plus Noise Ratio of pilot symbol signal lower.Undoubtedly, the Signal to Interference plus Noise Ratio of the pilot symbol signal that receives of receiving terminal has determined the accuracy that propagation channel is estimated.Because the Signal to Interference plus Noise Ratio of pilot symbol signal is lower, therefore be difficult to guarantee the accuracy of propagation channel estimation, thereby will directly influence the quality of reception of OQAM system, make the overall performance of OQAM system not ideal enough.
Summary of the invention
In view of this, main purpose of the present invention is to provide the signal transmitting method of a kind of OQAM system, can improve the Signal to Interference plus Noise Ratio of the pilot symbol signal in the propagation channel estimation, and then improve the accuracy that propagation channel is estimated, improve the OQAM systematic function on the whole.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses the signal transmitting method of a kind of OQAM system, the signal that transmitting terminal is launched comprises: frequency pilot sign solid part signal, frequency pilot sign imaginary signals and data-signal, and transmitting terminal is launched each signal by the emission value of each signal, it is characterized in that, determine that the method for the emission value of described each signal comprises:
A. dispose the frequency pilot sign solid part signal is formed real part interference signal of disturbing and the imaginary part interference signal that the frequency pilot sign imaginary signals is formed interference;
B. from described real part interference signal and imaginary part interference signal, select a data-signal arbitrarily;
C. be frequency pilot sign solid part signal and the frequency pilot sign imaginary signals configuration emission value that absolute value is identical and symbol is identical or opposite, dispose the emission value of other each data-signal the data-signal of selecting except that step B in described real part interference signal and the imaginary part interference signal;
D. determine to offset the emission value condition of real part interference signal and imaginary part interference that interference signal produces, according to the emission value of each data-signal of this emission value condition and step C configuration, the emission value of the data-signal that determining step B selects.
Wherein, described real part interference signal comprises: each signal of launching on the transmitting site of adjacent one deck around the frequency pilot sign solid part signal transmitting site; Described imaginary part interference signal comprises: each signal of launching on the transmitting site of adjacent one deck around frequency pilot sign solid part signal and the frequency pilot sign solid part signal transmitting site.
Wherein, in the described imaginary part interference signal, each signal of launching on the transmitting site of adjacent one deck around the described frequency pilot sign solid part signal transmitting site is: around the frequency pilot sign solid part signal transmitting site in all transmitting sites of adjacent one deck, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs each signal of launching on each transmitting site of odd carriers number.
Described step D comprises:
D1. determine the interference value that interference value that the real part interference signal produces and imaginary part interference signal produce, again according to the emission value symbol of frequency pilot sign solid part signal and the frequency pilot sign imaginary signals identical condition of determining to offset real part interference signal and imaginary part interference that interference signal produces whether;
D2. according to the described condition that offsets real part interference signal and imaginary part interference that interference signal produces of step D1, determine the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that constitutes by each data-signal in real part interference signal and the imaginary part interference signal;
D3. the emission value of believing according to each data of other except that the data-signal that step B selects in step D2 determined emission value condition and real part interference signal and the imaginary part interference signal, the emission value of the selected data-signal of determining step B.
Wherein, default a M0, n0Emission value for the frequency pilot sign solid part signal; a M0, n0+1Be the emission value of frequency pilot sign imaginary signals, and a m 0 , n 0 = a m 0 , n 0 + 1 ; m 0And n 0Be respectively the frequency domain coordinate and the time domain coordinate of frequency pilot sign solid part signal transmitting site; The channel coefficients of each signal of being launched is identical and for H M0, n0
Among the step D1, real part interference signal and imaginary part interference signal are set produce the interference value sum of disturbing the interference value that produces for described real part interference signal and the generation of imaginary part interference signal;
The interference value that described real part interference signal produces is:
jH m0，n0(-1) n0+1[A g(τ 0，ν 0)(a m0-1，n0-1+a m0-1，n0+1+a m0+1，n0-1+a m0+1，n0+1)+A g(τ 0，0)(a m0-1，n0-a m0+1，n0+(-1) n0(a m0，n0-1-a m0，n0+1))]
The interference value that described imaginary part interference signal produces is:
jH m0，n0(-1) n0+1[A g(2τ 0，ν 0)(a m0+1，n0-1-a m0-1，n0-1)-A g(τ 0，ν 0)(a m0-1，n0+a m0+1，n0)A g(τ 0，0)(a m0+1，n0+1-a m0-1，n0+1+(-1) n0a m0，n0)]
The described condition that offsets real part interference signal and imaginary part interference that interference signal produces:
[ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 )
+ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 ) ]
+ [ A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 )
A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0 (1)
Among the step D2, according to a m 0 , n 0 = a m 0 , n 0 + 1 , Reason formula (1) obtains the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that is made of each data-signal in real part interference signal and the imaginary part interference signal:
( A g ( τ 0 , v 0 ) - A g ( 2 τ 0 , v 0 ) ) a m 0 - 1 , n 0 - 1 +
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 + 1 , n 0 - 1 + ( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 + 1 , n 0 + 1 - a m 0 + 1 , n 0 ) +
( A g ( τ 0 , v 0 ) - A g ( τ 0 , 0 ) ) ( a m 0 - 1 , n 0 + 1 - a m 0 - 1 , n 0 ) + ( - 1 ) n 0 A g ( τ 0 , 0 ) a m 0 , n 0 - 1
= 0 (2)
Wherein, a M0-1, n0-1, a M0+1, n0-1, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0, a M0, n0-1Be the emission value of each data-signal in the described real part interference signal of the data-signal that comprises that step B selects and the imaginary part interference signal, the footnote of the symbol of each data signal transmission value of above-mentioned expression is represented the frequency domain coordinate and the time domain coordinate of each data signal transmission position; τ 0And ν 0Be respectively the base unit of transmitting site frequency domain coordinate and time domain coordinate, A g() is the ambiguity function of OQAM system basic function.
Wherein, default a M0, n0Emission value for the frequency pilot sign solid part signal; a M0, n0+1Be the emission value of frequency pilot sign imaginary signals, and a m 0 , n 0 = - a m 0 , n 0 + 1 ; m 0And n 0Be respectively the frequency domain coordinate and the time domain coordinate of frequency pilot sign solid part signal transmitting site; The channel coefficients of each signal of being launched is identical and for H M0, n0
Among the step D1, real part interference signal and imaginary part interference signal are set produce the poor of the interference value that disturbs the interference value that produces for described real part interference signal and the generation of imaginary part interference signal;
The interference value that described real part interference signal produces is:
jH m0，n0(-1) n0+1[A g(τ 0，ν 0)(a m0-1，n0-1+a m0-1，n0+1+a m0+1，n0-1+a m0+1，n0+1)+A g(τ 0，0)(a m0-1，n0-a m0+1，n0+(-1) n0(a m0，n0-1-a m0，n0+1))]
The interference value that described imaginary part interference signal produces is:
jH m0，n0(-1) n0+1[A g(2τ 0，ν 0)(a m0+1，n0-1-a m0-1，n0-1)-A g(τ 0，ν 0)(a m0-1，n0+a m0+1，n0)A g(τ 0，0)(a m0+1，n0+1-a m0-1，n0+1+(-1) n0a m0，n0)]
The described condition that offsets real part interference signal and imaginary part interference that interference signal produces is:
[ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 )
+ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 ) ]
- [ A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 )
+ A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0 (1’)
Among the step D2, according to a m 0 , n 0 = a m 0 , n 0 + 1 , Arrangement formula (1 ') obtains the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that is made of each data-signal in real part interference signal and the imaginary part interference signal:
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 - 1 , n 0 - 1 +
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 + 1 , n 0 - 1 + ( A g ( τ 0 , v 0 ) - A g ( τ 0 , 0 ) ) ( a m 0 + 1 , n 0 + 1 - a m 0 + 1 , n 0 ) +
( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 - 1 , n 0 + 1 + a m 0 - 1 , n 0 ) + ( - 1 ) n 0 A g ( τ 0 , 0 ) a m 0 , n 0 - 1
= 0 (2’)
Wherein, a M0-1, n0-1, a M0+1, n0-1, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0, a M0, n0-1Be the emission value of each data-signal in the described real part interference signal of the data-signal that comprises that step B selects and the imaginary part interference signal, the footnote of the symbol of each data signal transmission value of above-mentioned expression is represented the frequency domain coordinate and the time domain coordinate of each data signal transmission position; τ 0And ν 0Be respectively the base unit of transmitting site frequency domain coordinate and time domain coordinate, A g() is the ambiguity function of OQAM system basic function.
Wherein, described real part interference signal comprises: each signal of launching on the transmitting site of the adjacent ground floor and the second layer around the frequency pilot sign solid part signal transmitting site; Described imaginary part interference signal comprises: each signal of launching on the transmitting site of the adjacent ground floor and the second layer around frequency pilot sign solid part signal and the frequency pilot sign solid part signal transmitting site.
Wherein, in the described real part interference signal, each signal of launching on the transmitting site of each transmitting site of the adjacent second layer around the described frequency pilot sign solid part signal transmitting site is: around the frequency pilot sign solid part signal transmitting site in all transmitting sites of the adjacent second layer, differ the odd number signal period with the time domain coordinate of frequency pilot sign solid part signal transmitting site, perhaps differ each transmitting site of odd carriers number with the frequency domain coordinate of frequency pilot sign solid part signal transmitting site; And/or,
In the described imaginary part interference signal, each signal of launching on the transmitting site of the adjacent ground floor and the second layer around the described frequency pilot sign solid part signal transmitting site is: around the frequency pilot sign solid part signal transmitting site in all transmitting sites of the adjacent ground floor and the second layer, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs each signal of launching on each transmitting site of odd carriers number.
Among the step C, dispose each signal emission value according to the requirement that system transmits.
Wherein, when an above frequency pilot sign solid part signal is launched simultaneously, this method further comprises: the time domain coordinate that each frequency pilot sign solid part signal transmitting site is set differs the even number signal period, and the frequency domain coordinate of each frequency pilot sign solid part signal transmitting site differs the even carriers number; And/or,
When an above frequency pilot sign imaginary signals is launched simultaneously, this method further comprises: the time domain coordinate that each frequency pilot sign imaginary signals transmitting site is set differs the even number signal period, and the frequency domain coordinate of each frequency pilot sign imaginary signals transmitting site differs the even carriers number.
By such scheme as can be seen, key of the present invention is: at first, configuration real part interference signal and imaginary part interference signal are selected a data-signal arbitrarily from described real part interference signal and imaginary part interference signal; Then, be frequency pilot sign solid part signal and the identical emission value of frequency pilot sign imaginary signals configuration absolute value, dispose the emission value of other each data-signal except that selected data-signal in described real part interference signal and the imaginary part interference signal; Be the emission value of zero emission value condition and each data-signal of being disposed according to the real part interference signal is disturbed disturbing sum again, determine the emission value of selected data-signal with the imaginary part interference signal.
Therefore, the signal transmitting method of OQAM provided by the present invention system, not only can utilize of the interference of the data-signal of pilot symbol signal emission on every side to interference canceled signal, the energy value that can also make receiving terminal make full use of frequency pilot sign solid part signal and frequency pilot sign imaginary signals carries out propagation channel and estimates, improve the Signal to Interference plus Noise Ratio be used to carry out the pilot symbol signal that propagation channel estimates, make receiving terminal accurately finish propagation channel and estimate, guarantee the OQAM systematic function.
Description of drawings
Fig. 1 is the signal transmitting method handling process schematic diagram of existing OQAM system;
Fig. 2 is the schematic diagram that concerns between frequency pilot sign solid part signal and self the single order interference signal;
Fig. 3 is the inventive method one preferred embodiment handling process schematic diagram;
Fig. 4 is the schematic diagram that concerns between frequency pilot sign solid part signal, frequency pilot sign imaginary signals, real part interference signal and the imaginary part interference signal.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
The main processing thought of the inventive method is: at first, configuration forms real part interference signal of disturbing and the imaginary part interference signal that formation is disturbed to the frequency pilot sign imaginary signals, an optional data-signal from described real part interference signal and imaginary part interference signal again to the frequency pilot sign solid part signal; Dispose the emission value of other data-signal except that the selected data signal in described real part interference signal and the imaginary part interference signal, and be frequency pilot sign solid part signal and the identical emission value of frequency pilot sign imaginary signals configuration absolute value; Then, determine to offset the emission value condition of real part interference signal and imaginary part interference that interference signal produces, determine the emission value of selected data-signal according to the emission value of this emission value condition and each data-signal of being disposed, making described real part interference signal disturb and disturbing sum with the imaginary part interference signal is zero.Below in conjunction with Fig. 3 and Fig. 4 the processing of the inventive method is described in detail.
Fig. 3 is the inventive method one preferred embodiment handling process schematic diagram.In the present embodiment, described real part interference signal comprises: each signal of launching on the transmitting site of adjacent one deck around the frequency pilot sign solid part signal transmitting site; Described imaginary part interference signal comprises: the frequency pilot sign solid part signal, and around the frequency pilot sign solid part signal transmitting site in all transmitting sites of adjacent one deck, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs each signal of launching on each transmitting site of odd carriers number.As shown in Figure 3, the concrete processing comprises:
Step 301: from the real part interference signal that disposed and imaginary part interference signal, select a data-signal arbitrarily.
Fig. 4 is the schematic diagram that concerns between frequency pilot sign solid part signal, frequency pilot sign imaginary signals, real part interference signal and the imaginary part interference signal.As shown in Figure 4, black circle is represented frequency pilot sign solid part signal a M0, n0Transmitting site (m 0, n 0), described (m 0, n 0) eight transmitting sites that round dot is described real part interference signal in adjacent on every side one deck, these real part interference signals are expressed as respectively: a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0, a M0, n0-1And a M0, n0+1The round dot that oblique line shown in Figure 4 is filled is frequency pilot sign imaginary signals a M0, n0+1Transmitting site (m 0, n 0+ 1), then with frequency pilot sign imaginary signals a M0, n0+1The time domain coordinate of transmitting site differs the odd number signal period, perhaps with frequency pilot sign imaginary signals a M0, n0+1The frequency domain coordinate of transmitting site differs each signal of launching on the transmitting site of odd carriers number: a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0And a M0+1, n0, described imaginary part interference signal comprises: frequency pilot sign solid part signal a M0, n0, and above-mentioned a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0And a M0+1, n0Here, reference axis f represents each signal frequency-domain coordinate, and reference axis t represents the time domain coordinate of each signal, and the base unit that signal period duration is the time domain coordinate is τ 0, the carrier spacing between each signal is that the base unit of frequency domain coordinate is ν 0
According to above description as seen, described real part interference signal and imaginary part interference signal comprise: a M0, n0, a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0, a M0, n0-1And a M0, n0+1, data-signal wherein has seven, is respectively: a M0-1, n0-1, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0+1, a M0-1, n0, a M0+1, n0, a M0, n0-1, from these seven data-signals, choose a data-signal in this step wantonly, the round dot that dotted line is represented among Fig. 4 is the transmitting site (m of this optional data-signal 0, n 0-1), this optional data-signal is expressed as a M0, n0-1
The present invention also can be configured to the imaginary part interference signal: the signal of launching on all transmitting sites of adjacent one deck around frequency pilot sign solid part signal and the frequency pilot sign solid part signal transmitting site.Why the described imaginary part interference signal of present embodiment will differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, and perhaps the frequency domain coordinate with frequency pilot sign solid part signal transmitting site differs the odd carriers number, and its reason is:
Figure A20051006349400201
As the ambiguity function of OQAM system prototype function g (t), and A g(τ, ν) satisfy the described condition of formula (12):
A g(2nτ 0，2mν 0)＝0，(n，m)≠(0，0) (12)
Therefore, differ the even number signal period, and to differ the signal launched on the transmitting site of even carriers number with the frequency domain coordinate of pilot symbol signal transmitting site be zero to the interference of pilot symbol signal with the time domain coordinate of pilot symbol signal transmitting site.Such as: identify the signal of the emission on the coordinate position that alphabetical M is arranged among Fig. 4 to (m 0, n 0+ 1) pilot transmitted imaginary part of symbol signal a on the position M0, n0+1Interference be zero.That is to say: when calculating described imaginary part interference signal and disturb, these time domain coordinates with frequency pilot sign imaginary signals transmitting site differ the even number signal period and differ the corresponding interference value of each signal of launching on the transmitting site of even carriers number with the frequency domain coordinate of frequency pilot sign imaginary signals transmitting site is zero certainly.
So, in order to save resource, omitting unnecessary computational process, present embodiment is calculating described imaginary part interference signal to frequency pilot sign imaginary signals a M0, n0+1Interference the time, do not consider to differ the even number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, and differ each signal of launching on the transmitting site of even carriers number with the frequency domain coordinate of frequency pilot sign imaginary signals transmitting site, thereby described imaginary part interference signal is configured to: the frequency pilot sign solid part signal, and around the frequency pilot sign solid part signal transmitting site in all transmitting sites of adjacent ground floor, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs the signal of launching on each transmitting site of odd carriers number.
Step 302: according to the needs configuration frequency pilot sign solid part signal a of system signal emission M0, n0With frequency pilot sign imaginary signals a M0, n0+1The emission value, and dispose and remove the selected a of step 301 in each data-signal in described real part interference signal and the imaginary part interference signal M0, n0-1Outside the emission value of other each data-signal.Here, be frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1The configuration emission value that absolute value is identical and symbol is identical.
According to the relation of frequency pilot sign solid part signal shown in Figure 4, frequency pilot sign imaginary signals and each data-signal as can be known, described step 302 is specially: configuration frequency pilot sign solid part signal a M0, n0, frequency pilot sign imaginary signals a M0, n0+1, and each data-signal a M0-1, n0-1, a M0-1, n0, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0, a M0+1, n0+1The emission value.
Step 303: determining step 301 selected data-signal a M0, n0-1The emission value, when making receiving terminal carry out channel estimating, described real part interference signal and imaginary part interference signal produce and disturb is zero.
In this step, at first to determine to offset the emission value condition of real part interference signal and imaginary part interference that interference signal produces, if that is: the emission value of each real part interference signal and imaginary part interference signal satisfies this emission value condition, in the time of then making receiving terminal carry out channel estimating, real part interference signal and imaginary part interference signal produce and disturb is zero.
The derivation of the described emission value condition of determining to offset real part interference signal and imaginary part interference that interference signal produces is as follows:
According to background technology, when receiving terminal receives frequency pilot sign solid part signal and frequency pilot sign imaginary signals, received signal r (t) shown in the formula (3) is projected to corresponding basic function g respectively M0, n0(t) and g M0, n0+1(t) on, and on the adjacent transmission position, propagation channel coefficients H M, nCan think constant approx, then obtain frequency pilot sign solid part signal and frequency pilot sign imaginary signals corresponding respectively formula (13) and formula (14):
Because, frequency pilot sign solid part signal a in the present embodiment M0, n0With frequency pilot sign imaginary signals a M0, n0+1Emission value absolute value identical and symbol is identical.Then this moment, the receiving terminal setting obtained combined signal with frequency pilot sign solid part signal and the addition of frequency pilot sign imaginary signals shown in formula (13) and the formula (14), and used this combined signal to carry out channel estimating, this combined signal z M0, n0Be expressed as:
z m 0 , n 0 = Δ y m 0 , n 0 + y m 0 , n 0 + 1
= 2 H m 0 , n 0 a m 0 , n 0 + I m 0 , n 0 + I m 0 , n 0 + 1 + w m 0 , n 0 + w m 0 , n 0 + 1 (15)
If with the real part interference signal to frequency pilot sign solid part signal a M0, n0The interference value that produces is designated as Ω 1 M0, n0, with the imaginary part interference signal to frequency pilot sign imaginary signals a M0, n0+1The interference value that produces is designated as Ω 1 M0, n0+1, then above-mentioned formula (15) can be expressed as formula (16):
z m 0 , n 0 = Δ y m 0 , n 0 + y m 0 , n 0 + 1 = 2 H m 0 , n 0 a m 0 , n 0 + Ω 1 m 0 , n 0 + Ω 1 m 0 , n 0 + 1
+ ( I m 0 , n 0 \ Ω 1 m 0 , n 0 + I m 0 , n 0 + 1 \ Ω 1 m 0 , n 0 + 1 ) + ( w m 0 , n 0 + w m 0 , n 0 + 1 ) (16)
In addition, utilize the described formula of background technology (9) can be with Ω 1 M0, n0And Ω 1 M0, n0+1Be expressed as formula (17) and formula (18) respectively:
Ω 1 m 0 , n 0 ≈ j H m 0 , n 0 ( - 1 ) n 0 + 1 [ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 ) +
A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] (17)
Ω 1 m 0 , n 0 + 1 ≈ j H m 0 , n 0 ( - 1 ) n 0 + 1 [ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 )
A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 ) ] (18)
According to formula (16) as can be known, for the combined signal that is used to carry out channel estimating that receiving terminal is set, real part interference signal and imaginary part interference signal produce to disturb and are Ω 1 M0, n0+ Ω 1 M0, n0+1, that is to say that present embodiment sets real part interference signal and imaginary part interference signal and produce to disturb and be the interference value of real part interference signal generation and the interference value sum of imaginary part interference signal generation, if Ω 1 m 0 , n 0 + Ω 1 m 0 , n 0 + 1 = 0 , Then according to the condition that offsets real part interference signal and imaginary part interference that interference signal produces shown in formula (17) and formula (18) the derivation formula (19):
[ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 )
+ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 ) ]
- [ A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 )
+ A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0 (19)
Because, frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1The absolute value of emission value is identical and symbol is identical, therefore, following formula (19) arrangement is obtained following formula (20):
( A g ( τ 0 , v 0 ) - A g ( 2 τ 0 , v 0 ) ) a m 0 - 1 , n 0 - 1 +
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 + 1 , n 0 - 1 + ( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 + 1 , n 0 + 1 - a m 0 + 1 , n 0 ) +
( A g ( τ 0 , v 0 ) - A g ( τ 0 , 0 ) ) ( a m 0 - 1 , n 0 + 1 - a m 0 - 1 , n 0 ) + ( - 1 ) n 0 A g ( τ 0 , 0 ) a m 0 , n 0 - 1
= 0 (20)
In the formula (20), A g(τ 0, ν 0), A g(τ 0, 0) and A g(2 τ 0, ν 0) be constant, but calculated in advance obtains.Therefore, by each data-signal a that step 302 disposed M0-1, n0-1, a M0+1, n0-1,, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0The emission value, can calculate a according to formula (20) M0, n0-1The emission value, and the emission value of these seven signals to satisfy formula (20) described Ω 1 m 0 , n 0 + Ω 1 m 0 , n 0 + 1 = 0 Condition, if that is: launch this seven signals by above-mentioned emission value, the real part interference signal is disturbed disturbed sum with the imaginary part interference signal is zero.
Therefore, formula (20) promptly is the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that is made of each data-signal in interference of real part interference signal and the imaginary part interference signal.This step is according to the data signal transmission value of described six points of configuration in this emission value condition and the step 302, that is: a M0-1, n0-1, a M0+1, n0-1, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0The emission value, can determining step 301 selected data-signal a M0, n0-1The emission value, make Ω 1 m 0 , n 0 + Ω 1 m 0 , n 0 + 1 = 0 , Thereby reach the purpose that offsets described real part interference signal interference and imaginary part interference signal interference sum.
Step 304: 302 emission values that disposed set by step, emission frequency pilot sign solid part signal a M0, n0, frequency pilot sign imaginary signals a M0, n0+1, and each data-signal a M0-1, n0-1, a M0-1, n0, a M0-1, n0+1, a M0+1, n0-1, a M0+1, n0, a M0+1, n0+1, 303 determined emission value step of transmitting 301 selected data-signal a set by step M0, n0-1
Because, adopt the emission value that satisfies launching condition shown in the formula (20) to launch described pilot symbol signal and each data-signal, therefore, middle real part interference signal of formula (16) and imaginary part interference signal produce and disturb is zero, promptly Ω 1 m 0 , n 0 + Ω 1 m 0 , n 0 + 1 = 0 · At this moment, according to formula (16) receiving terminal propagation channel is estimated as
Figure A20051006349400234
H ^ m 0 , n 0 = z m 0 , n 0 2 a m 0 , n 0 = H m 0 , n 0 + I m 0 , n 0 \ Ω 1 m 0 , n 0 + I m 0 , n 0 + 1 \ Ω 1 m 0 , n 0 + 1 2 a m 0 , n 0 + w m 0 , n 0 + w m 0 , n 0 + 1 2 a m 0 , n 0 - - - ( 21 )
By formula (21) as seen, frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1Because the emission value is identical, therefore at combined signal z M0, n0In be the energy coherent superposition, promptly the energy coherent superposition is 2a M0, n0, and distracter I M0, n0And I M0, n0+1, with noise item w M0, n0And w M0, n0+1Then be non-coherent addition, the Signal to Interference plus Noise Ratio that therefore makes receiving terminal be used to do the pilot symbol signal that propagation channel estimates is improved.
In addition, described frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1The emission value also can be configured to the identical emission value of opposite in sign and absolute value, promptly a m 0 , n 0 = - a m 0 , n 0 + 1 · Because frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1The opposite in sign of emission value, then receiving terminal was set the frequency pilot sign solid part signal shown in formula (13) and the formula (14) and frequency pilot sign imaginary signals subtracted each other and was obtained combined signal this moment, and used this combined signal to carry out channel estimating, this combined signal z M0, n0Be expressed as:
z m 0 , n 0 = Δ y m 0 , n 0 - y m 0 , n 0 + 1
= 2 H m 0 , n 0 a m 0 , n 0 + I m 0 , n 0 - I m 0 , n 0 + 1 + w m 0 , n 0 - w m 0 n 0 + 1 (15’)
If with the real part interference signal to frequency pilot sign solid part signal a M0, n0The interference value that produces is designated as Ω 1 M0, n0, with the imaginary part interference signal to frequency pilot sign imaginary signals a M0, n0+1The interference value that produces is designated as Ω 1 M0, n0+1, then above-mentioned formula (15 ') can be expressed as formula (16 '):
z m 0 , n 0 = Δ y m 0 , n 0 - y m 0 , n 0 + 1 = 2 H m 0 , n 0 a m 0 , n 0 + Ω 1 m 0 , n 0 - Ω 1 m 0 , n 0 + 1
+ ( I m 0 , n 0 \ Ω 1 m 0 , n 0 - I m 0 , n 0 + 1 \ Ω 1 m 0 , n 0 + 1 ) + ( w m 0 , n 0 - w m 0 , n 0 + 1 ) (16’)
According to formula (16 ') as can be known, for the combined signal that is used to carry out channel estimating that receiving terminal is set, real part interference signal and imaginary part interference signal produce to disturb and are Ω 1 M0, n0-Ω 1 M0, n0+1, that is to say that setting real part interference signal and imaginary part interference signal this moment produces and disturb poor for the interference value of the interference value of real part interference signal generation and the generation of imaginary part interference signal, if Ω 1 m 0 , n 0 - Ω 1 m 0 , n 0 + 1 = 0 , Then according to the condition that offsets real part interference signal and imaginary part interference that interference signal produces shown in formula (17) and formula (18) the derivation formulas (19 '):
[ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 )
+ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 ) ]
- [ A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 )
+ A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0 (19’)
Because, frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1Identical and the opposite in sign of the absolute value of emission value, therefore, following formula (19 ') arrangement is obtained following formula (20 '), and this formula (20 ') i.e. is emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces for being made of each data-signal in interference of real part interference signal and the imaginary part interference signal:
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 - 1 , n 0 - 1 +
( A g ( τ 0 , v 0 ) - A g ( 2 τ 0 , v 0 ) ) a m 0 + 1 , n 0 - 1 + ( A g ( τ 0 , v 0 ) - A g ( τ 0 , 0 ) ) ( a m 0 + 1 , n 0 + 1 - a m 0 + 1 , n 0 ) +
( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 - 1 , n 0 + 1 - a m 0 - 1 , n 0 ) + ( - 1 ) n 0 A g ( τ 0 , 0 ) a m 0 , n 0 - 1
= 0 (20’)
In like manner, the frequency pilot sign solid part signal a that also can be disposed according to the emission value condition and the step 302 that offset real part interference signal and imaginary part interference that interference signal produces shown in the formula (20 ') M0, n0, frequency pilot sign imaginary signals a M0, n0+1And each data-signal a M0-1, n0-1, a M0+1, n0-1, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0The emission value calculates a M0, n0-1The emission value.
Because, adopt the emission value that satisfies the condition of emission value shown in the formula (20 '), launch described pilot symbol signal and each data-signal, therefore, middle real part interference signal of formula (16 ') and imaginary part interference signal produce and disturb is zero, promptly Ω 1 m 0 , n 0 - Ω 1 m 0 , n 0 + 1 = 0 · At this moment, according to formula (16 ') receiving terminal propagation channel is estimated as
H ^ m 0 , n 0 = z m 0 , n 0 2 a m 0 , n 0 = H m 0 , n 0 + I m 0 , n 0 \ Ω 1 m 0 , n 0 - I m 0 , n 0 + 1 \ Ω 1 m 0 , n 0 + 1 2 a m 0 , n 0 + w m 0 , n 0 - w m 0 , n 0 + 1 2 a m 0 , n 0 - - - ( 21 ' )
According to as seen, though frequency pilot sign solid part signal a with following formula (21 ') M0, n0With frequency pilot sign imaginary signals a M0, n0+1Emission value opposite in sign, but frequency pilot sign solid part signal a M0, n0With frequency pilot sign imaginary signals a M0, n0+1At combined signal z M0, n0In be the energy coherent superposition equally, promptly the energy coherent superposition is 2a M0, n0, and distracter I M0, n0And I M0, n0+1, with noise item w M0, n0And w M0, n0+1Then be non-coherent addition, the Signal to Interference plus Noise Ratio that therefore makes receiving terminal be used to do the pilot symbol signal that propagation channel estimates is improved equally.
The present invention also can be configured to described real part interference signal: each signal of launching on the transmitting site of the adjacent ground floor and the second layer around the frequency pilot sign solid part signal transmitting site, and the imaginary part interference signal is configured to: frequency pilot sign solid part signal, and each signal of launching on the transmitting site of adjacent ground floor and the second layer around the frequency pilot sign solid part signal transmitting site.At this moment, corresponding the becoming of the described treatment step of Fig. 3:
Step 301: from the real part interference signal that disposed and imaginary part interference signal, select a data-signal arbitrarily.
Step 302: be frequency pilot sign solid part signal and the identical emission value of frequency pilot sign imaginary signals configuration absolute value, be each data-signal configuration emission value of other except that the selected data-signal of step 301 in described real part interference signal and the imaginary part interference signal.
By as can be known noted earlier, differ the even number signal period with the time domain coordinate of pilot symbol signal transmitting site, and to differ the interference that the signal launched on the transmitting site of even carriers number forms pilot symbol signal with the frequency domain coordinate of pilot symbol signal transmitting site be zero.Such as: identify the signal of the emission on the coordinate position that alphabetical N is arranged among Fig. 4 to (m 0, n 0) pilot transmitted symbol solid part signal a on the position M0, n0The interference that forms is zero, and the signal that identifies the emission on the coordinate position that alphabetical M is arranged is to (m 0, n 0+ 1) pilot transmitted imaginary part of symbol signal a on the position M0, n0+1The interference that forms is zero.That is to say: calculating that described real part interference signal is disturbed and described imaginary part interference signal when disturbing, these time domain coordinates with frequency pilot sign solid part signal or frequency pilot sign imaginary signals transmitting site differ the even number signal period and differ the corresponding interference value of each signal of launching on the transmitting site of even carriers number with the frequency domain coordinate of frequency pilot sign solid part signal or frequency pilot sign imaginary signals transmitting site is zero certainly.
Therefore, for omitting unnecessary amount of calculation, the present invention can also dispose real part interference signal and imaginary part interference signal as follows, can realize goal of the invention equally.The real part interference signal that is disposed comprises: the signal of launching on each transmitting site of adjacent ground floor around the frequency pilot sign solid part signal transmitting site, and around the frequency pilot sign solid part signal transmitting site in all transmitting sites of the adjacent second layer, differ the odd number signal period with the time domain coordinate of frequency pilot sign solid part signal transmitting site, perhaps the frequency domain coordinate with frequency pilot sign solid part signal transmitting site differs each signal of launching on each transmitting site of odd carriers number; And/or, described imaginary part interference signal is configured to: the frequency pilot sign solid part signal, and around the frequency pilot sign solid part signal transmitting site in all transmitting sites of adjacent ground floor and the second layer, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs each signal of launching on each transmitting site of odd carriers number.
Step 303: the emission value condition of at first determining to offset real part interference signal and imaginary part interference that interference signal produces, if that is: the emission value of each real part interference signal and each imaginary part interference signal satisfies this emission value condition, in the time of then making receiving terminal carry out channel estimating, the real part interference signal is disturbed and produced interference with the imaginary part interference signal is zero.The emission value of each data-signal that is disposed according to this emission value condition and step 302 then, the emission value of determining step 301 selected data-signals.
The derivation of equation process that relates to when realizing this treatment step, its derivation principle is set forth in front, therefore is not described further here.
Step 304: the 302 emission values that disposed are launched other each data-signal except that the selected data-signal of step 301 in described frequency pilot sign solid part signal, frequency pilot sign imaginary signals and described real part interference signal and the imaginary part interference signal set by step; 303 determined emission value step of transmitting 301 selected data-signals set by step.
More than enumerated the processing of configuration real part interference signal and imaginary part interference signal in around the frequency pilot sign solid part signal adjacent one deck or the two-layer scope, described real part interference signal and imaginary part interference signal also can be configured in other scope, can be configured to the signal of launching on adjacent one deck around the frequency pilot sign solid part signal transmitting site or the two-layer transmitting site such as: described real part interference signal, described imaginary part interference signal can be configured to signal of launching on adjacent one deck around the frequency pilot sign imaginary signals transmitting site or the two-layer transmitting site or the like.No matter which kind of situation real part interference signal and imaginary part interference signal are configured to; the present invention handles all with shown in Figure 3 similar; the basic principle of being followed during the emission value of optional data-signal in determining real part interference signal and imaginary part interference signal is also identical; here describe in detail no longer one by one, but all in protection scope of the present invention.
In addition, because being used to propagation channel, pilot symbol signal estimates, generally the transmitting power of pilot symbol signal all can be more a lot of greatly than the transmitting power of data-signal, if the transmitting site of each pilot symbol signal is misorient, also can have the phase mutual interference between each pilot symbol signal.Therefore, when launching an above frequency pilot sign solid part signal at the same time, the inventive method further comprises: it is zero that the relation that each frequency pilot sign solid part signal transmitting site is set makes the interference between each frequency pilot sign solid part signal; And/or when launching an above frequency pilot sign solid part signal at the same time, the inventive method further comprises: it is zero that the relation that each frequency pilot sign imaginary signals transmitting site is set makes the interference between each frequency pilot sign imaginary signals.Utilize described formula (12) as can be known, differ the even number signal period with the time domain coordinate of pilot symbol signal transmitting site, and differ the signal of launching on the transmitting site of even carriers number with the frequency domain coordinate of pilot symbol signal transmitting site and can not produce and disturb pilot symbol signal.Can guarantee not disturb fully between the pilot symbol signal as long as satisfy between the transmitting site of each pilot symbol signal when time domain and frequency domain coordinate all differ even number, so the relation of the transmitting site of each frequency pilot sign solid part signal of the inventive method is set to: the time domain coordinate of the transmitting site of each frequency pilot sign solid part signal differs the even number signal period, and the frequency domain coordinate of the transmitting site of each frequency pilot sign solid part signal differs the even carriers number; And/or, the relation of the transmitting site of each frequency pilot sign imaginary signals is set to: the time domain coordinate of the transmitting site of each frequency pilot sign imaginary signals differs the even number signal period, and the frequency domain coordinate of the transmitting site of each frequency pilot sign imaginary signals differs the even carriers number.Like this, just can eliminate interference between each frequency pilot sign solid part signal and/or the interference between each frequency pilot sign imaginary signals, further reduce the interference that pilot symbol signal is subjected to, improve the Signal to Interference plus Noise Ratio of pilot symbol signal.
In sum, use the inventive method emission pilot symbol signal and described each data-signal, the signal value that makes receiving terminal can make full use of frequency pilot sign solid part signal and frequency pilot sign imaginary signals carries out propagation channel and estimates, and offseted the interference that real part interference signal and imaginary part interference signal are produced, can also be further, the rational transmitting site of each pilot symbol signal can eliminate interference between each pilot symbol signal by being set, improve the Signal to Interference plus Noise Ratio of pilot symbol signal, thereby make the estimation of propagation channel more accurate, guarantee the OQAM systematic function.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.

Claims (10)

1, the signal transmitting method of a kind of offset orthogonal amplitude modulation(PAM) OQAM system, the signal that transmitting terminal is launched comprises: frequency pilot sign solid part signal, frequency pilot sign imaginary signals and data-signal, and transmitting terminal is launched each signal by the emission value of each signal, it is characterized in that, determine that the method for the emission value of described each signal comprises:
A. dispose the frequency pilot sign solid part signal is formed real part interference signal of disturbing and the imaginary part interference signal that the frequency pilot sign imaginary signals is formed interference;
B. from described real part interference signal and imaginary part interference signal, select a data-signal arbitrarily;
C. be frequency pilot sign solid part signal and the frequency pilot sign imaginary signals configuration emission value that absolute value is identical and symbol is identical or opposite, dispose the emission value of other each data-signal the data-signal of selecting except that step B in described real part interference signal and the imaginary part interference signal;
D. determine to offset the emission value condition of real part interference signal and imaginary part interference that interference signal produces, according to the emission value of each data-signal of this emission value condition and step C configuration, the emission value of the data-signal that determining step B selects.
2, method according to claim 1 is characterized in that, described real part interference signal comprises: each signal of launching on the transmitting site of adjacent one deck around the frequency pilot sign solid part signal transmitting site; Described imaginary part interference signal comprises: each signal of launching on the transmitting site of adjacent one deck around frequency pilot sign solid part signal and the frequency pilot sign solid part signal transmitting site.
3, method according to claim 2, it is characterized in that, in the described imaginary part interference signal, each signal of launching on the transmitting site of adjacent one deck around the described frequency pilot sign solid part signal transmitting site is: around the frequency pilot sign solid part signal transmitting site in all transmitting sites of adjacent one deck, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs each signal of launching on each transmitting site of odd carriers number.
4, method according to claim 3 is characterized in that, step D comprises:
D1. determine the interference value that interference value that the real part interference signal produces and imaginary part interference signal produce, again according to the emission value symbol of frequency pilot sign solid part signal and the frequency pilot sign imaginary signals identical condition of determining to offset real part interference signal and imaginary part interference that interference signal produces whether;
D2. according to the described condition that offsets real part interference signal and imaginary part interference that interference signal produces of step D1, determine the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that constitutes by each data-signal in real part interference signal and the imaginary part interference signal;
D3. the emission value of believing according to each data of other except that the data-signal that step B selects in step D2 determined emission value condition and real part interference signal and the imaginary part interference signal, the emission value of the selected data-signal of determining step B.
5, method according to claim 4 is characterized in that, default a M0, n0Emission value for the frequency pilot sign solid part signal; a M0, n0+1Be the emission value of frequency pilot sign imaginary signals, and a m 0 , n 0 = a m 0 , n 0 + 1 ; m 0And n 0Be respectively the frequency domain coordinate and the time domain coordinate of frequency pilot sign solid part signal transmitting site; The channel coefficients of each signal of being launched is identical and for H M0, n0
Among the step D1, real part interference signal and imaginary part interference signal are set produce the interference value sum of disturbing the interference value that produces for described real part interference signal and the generation of imaginary part interference signal;
The interference value that described real part interference signal produces is:
jH m0，n0(-1) n0+1[A g(τ 0，ν 0)(a m0-1，n0-1+a m0-1，n0+1+a m0+1，n0-1+a m0+1，n0+1)+
A g(τ 0，0)a m0-1，n0-a m0+1，n0+(-1) n0(a m0，n0-1-a m0，n0+1))]
The interference value that described imaginary part interference signal produces is:
jH m0，n0(-1) n0+1[A g(2τ 0，ν 0)(a m0+1，n0-1-a m0-1，n0-1)-A g(τ 0，ν 0)(a m0-1，n0+a m0+1，n0)
A g(τ 0，0)(a m0+1，n0+1-a m0-1，n0+1+(-1) n0a m0，n0)]
The described condition that offsets real part interference signal and imaginary part interference that interference signal produces:
[ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 )
+ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 ) ]
+ [ A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 ) - - - ( 1 )
+ A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0
Among the step D2, according to a m 0 , n 0 = a m 0 , n 0 + 1 , Arrangement formula (1) obtains the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that is made of each data-signal in real part interference signal and the imaginary part interference signal:
( A g ( τ 0 , v 0 ) - A g ( 2 τ 0 , v 0 ) ) a m 0 - 1 , n 0 - 1 +
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 + 1 , n 0 - 1 + ( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 + 1 , n 0 + 1 - a m 0 + 1 , n 0 ) + - - - ( 2 )
( A g ( τ 0 , v 0 ) - A g ( τ 0 , 0 ) ) ( a m 0 - 1 , n 0 + 1 - a m 0 - 1 , n 0 ) + ( - 1 ) n 0 A g ( τ 0 , 0 ) a m 0 , n 0 - 1
= 0
Wherein, a M0-1, n0-1, a M0+1, n0-1, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0, a M0, n0-1Be the emission value of each data-signal in the described real part interference signal of the data-signal that comprises that step B selects and the imaginary part interference signal, the footnote of the symbol of each data signal transmission value of above-mentioned expression is represented the frequency domain coordinate and the time domain coordinate of each data signal transmission position; τ 0And ν 0Be respectively the base unit of transmitting site frequency domain coordinate and time domain coordinate, A g() is the ambiguity function of OQAM system basic function.
6, method according to claim 4 is characterized in that, default a M0, n0Emission value for the frequency pilot sign solid part signal; a M0, n0+1Be the emission value of frequency pilot sign imaginary signals, and a m 0 , n 0 = - a m 0 , n 0 + 1 ; m 0And n 0Be respectively the frequency domain coordinate and the time domain coordinate of frequency pilot sign solid part signal transmitting site; The channel coefficients of each signal of being launched is identical and for H M0, n0
Among the step D1, real part interference signal and imaginary part interference signal are set produce the poor of the interference value that disturbs the interference value that produces for described real part interference signal and the generation of imaginary part interference signal;
The interference value that described real part interference signal produces is:
jH m0，n0(-1) n0+1[A g(τ 0，ν 0(a m0-1，n0-1+a m0-1，n0+1+a m0+1，n0-1+a m0+1，n0+1)+
A g(τ 0，0)(a m0-1，n0-a m0+1，n0+(-1) n0(a m0，n0-1-a m0，n0+1))]
The interference value that described imaginary part interference signal produces is:
jH m0，n0(-1) n0+1[A g(2τ 0，ν 0(a m0+1，n0-1-a m0-1，n0-1)-A g(τ 0，ν 0)(a m0-1，n0+a m0+1，n0)
A g(τ 0，0)(a m0+1，n0+1-a m0-1，n0+1+(-1) n0a m0，n0)]
The described condition that offsets real part interference signal and imaginary part interference that interference signal produces is:
[ A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 - 1 + a m 0 - 1 , n 0 + 1 + a m 0 + 1 , n 0 - 1 + a m 0 + 1 , n 0 + 1 )
+ A g ( 2 τ 0 , v 0 ) ( a m 0 + 1 , n 0 - 1 - a m 0 - 1 , n 0 - 1 ) - A g ( τ 0 , v 0 ) ( a m 0 - 1 , n 0 + a m 0 + 1 , n 0 ) ] - - - ( 1 ' )
- [ A g ( τ 0 , 0 ) ( a m 0 + 1 , n 0 + 1 - a m 0 - 1 , n 0 + 1 + ( - 1 ) n 0 a m 0 , n 0 )
+ A g ( τ 0 , 0 ) ( a m 0 - 1 , n 0 - a m 0 + 1 , n 0 + ( - 1 ) n 0 ( a m 0 , n 0 - 1 - a m 0 , n 0 + 1 ) ) ] = 0
Among the step D2, according to a m 0 , n 0 = - a m 0 , n 0 + 1 , Arrangement formula (1 ') obtains the emission value condition that offsets real part interference signal and imaginary part interference that interference signal produces that is made of each data-signal in real part interference signal and the imaginary part interference signal:
( A g ( τ 0 , v 0 ) - A g ( 2 τ 0 , v 0 ) ) a m 0 - 1 , n 0 - 1 +
( A g ( τ 0 , v 0 ) + A g ( 2 τ 0 , v 0 ) ) a m 0 + 1 , n 0 - 1 + ( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 + 1 , n 0 + 1 - a m 0 + 1 , n 0 ) + - - - ( 2 ' )
( A g ( τ 0 , v 0 ) + A g ( τ 0 , 0 ) ) ( a m 0 - 1 , n 0 + 1 - a m 0 - 1 , n 0 ) + ( - 1 ) n 0 A g ( τ 0 , 0 ) a m 0 , n 0 - 1
= 0
In the calculation, a M0-1, n0-1, a M0+1, n0-1, a M0+1, n0+1, a M0+1, n0, a M0-1, n0+1, a M0-1, n0, a M0, n0-1Be the emission value of each data-signal in the described real part interference signal of the data-signal that comprises that step B selects and the imaginary part interference signal, the footnote of the symbol of each data signal transmission value of above-mentioned expression is represented the frequency domain coordinate and the time domain coordinate of each data signal transmission position; τ 0And ν 0Be respectively the base unit of transmitting site frequency domain coordinate and time domain coordinate, A g() is the ambiguity function of OQAM system basic function.
7, method according to claim 1 is characterized in that, described real part interference signal comprises: each signal of launching on the transmitting site of the adjacent ground floor and the second layer around the frequency pilot sign solid part signal transmitting site; Described imaginary part interference signal comprises: each signal of launching on the transmitting site of the adjacent ground floor and the second layer around frequency pilot sign solid part signal and the frequency pilot sign solid part signal transmitting site.
8, method according to claim 7 is characterized in that,
In the described real part interference signal, each signal of launching on the transmitting site of each transmitting site of the adjacent second layer around the described frequency pilot sign solid part signal transmitting site is: around the frequency pilot sign solid part signal transmitting site in all transmitting sites of the adjacent second layer, differ the odd number signal period with the time domain coordinate of frequency pilot sign solid part signal transmitting site, perhaps differ each transmitting site of odd carriers number with the frequency domain coordinate of frequency pilot sign solid part signal transmitting site; And/or,
In the described imaginary part interference signal, each signal of launching on the transmitting site of the adjacent ground floor and the second layer around the described frequency pilot sign solid part signal transmitting site is: around the frequency pilot sign solid part signal transmitting site in all transmitting sites of the adjacent ground floor and the second layer, differ the odd number signal period with the time domain coordinate of frequency pilot sign imaginary signals transmitting site, perhaps the frequency domain coordinate with frequency pilot sign imaginary signals transmitting site differs each signal of launching on each transmitting site of odd carriers number.
9, according to each described method of claim 1 to 8, it is characterized in that, among the step C, dispose each signal emission value according to the requirement that system transmits.
10, according to each described method of claim 1 to 8, it is characterized in that, when an above frequency pilot sign solid part signal is launched simultaneously, this method further comprises: the time domain coordinate that each frequency pilot sign solid part signal transmitting site is set differs the even number signal period, and the frequency domain coordinate of each frequency pilot sign solid part signal transmitting site differs the even carriers number; And/or,
When an above frequency pilot sign imaginary signals is launched simultaneously, this method further comprises: the time domain coordinate that each frequency pilot sign imaginary signals transmitting site is set differs the even number signal period, and the frequency domain coordinate of each frequency pilot sign imaginary signals transmitting site differs the even carriers number.
CNB2005100634949A 2005-04-11 2005-04-11 Method for transmitting signal of offset orthogonal amplitude modulation system Expired - Fee Related CN100512259C (en)

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CN103583024A (en) * 2011-02-28 2014-02-12 奥兰治 Method for modulating an OQAM multi-carrier signal, and corresponding computer program and modulator
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