CN100486239C - Method for transmitting signal of offset orthogonal amplitude modulation system - Google Patents

Abstract

A method for emitting signal of offset orthogonal amplitude modulation system includes configuring adjacent two layer or above layer signal around real part signal of pilot frequency symbol to be interference signal of pilot frequency real part symbol, configuring emission value of pilot frequency symbol real part signal and emission value of each data interference signal on said real part, confirming emission value condition of interference to counterbalance interference signal of pilot frequency symbol real part signal, confirming emission value of pilot frequency symbol virtual signal according to said emission condition and configured emission value.

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):

$s\left(t\right)=\underset{n}{\mathrm{\&Sigma;}}\underset{m=0}{\overset{M-1}{\mathrm{\&Sigma;}}}{a}_{m,n}{i}^{m+\mathrm{<figure-callout\; id="2"\; label="n\; e"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}{e}^{}{}^{2\mathrm{j\&pi;m}{v}_{0}t}g(t-n{\mathrm{\&tau;}}_0)---\left(1\right)$

Wherein, t express time, a _{M, n}It 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, n}Be 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 $\stackrel{\&RightArrow;}{a}=[a_{0,n},a_{1,n},\&CenterDot;\&CenterDot;\&CenterDot;,a_{M-1,n}],$ M=0,1 ..., M-1, M are the channel number, n is an integer, v ₀Represent the carrier spacing between each signal, and satisfy v 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 $g_{m,n}\left(t\right)=i^{m+\mathrm{<figure-callout\; id="2"\; label="n\; e"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}{e}^{}{}^{2\mathrm{j\&pi;m}{v}_{0}t}g(t-n{\mathrm{\&tau;}}_0),$ This basic function g _{M, n}(t) satisfied property of orthogonality as the formula (2):

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, 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 v 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, n}Being 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):

$r\left(t\right)=\underset{n}{\mathrm{\&Sigma;}}\underset{m=0}{\overset{M-1}{\mathrm{\&Sigma;}}}{H}_{m,n}{a}_{m,n}{g}_{m,n}\left(t\right)+w\left(t\right)---\left(2\right)$

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 g _{M, n}(t) result who obtains on is as shown in the formula shown in (4):

Suppose

For by suitable channel estimation methods to propagation channel coefficients H _{M, n}The estimation of making, then the ofdm signal a of transmitting terminal emission _{M, n}Be detected as at receiving terminal

In the formula (5), the signal of other channel is to a _{M, n}Interference

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 the frequency pilot sign solid part signal

This paper the following stated

All represent the frequency pilot sign solid part signal, then receiving terminal should (m ₀, n ₀) channel coefficients of transmitting site

Be estimated as

Be expressed as formula (7):

From formula (7) as seen, With

With right

Estimation exert an influence.Because all there is noise item in any system

And can't eliminate

To the interference that propagation channel is estimated, therefore can only be by reducing Promptly reduce the frequency pilot sign solid part signal Other signal of launching on the transmitting site on every side is right

Interference, 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

The accuracy of estimating.The signal interference ratio of described pilot symbol signal can be used

Express.

The quick fading characteristic of the filter that adopts according to the OQAM system as can be known, at channel coefficients

During estimation, distracter

Main contribution derive from the frequency pilot sign solid part signal

Transmitting 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

Transmitting site (m ₀, n ₀) each signal of launching on the transmitting site of adjacent one deck on every side is referred to as the frequency pilot sign solid part signal

The single order interference signal, the interference that this single order interference signal produces is called the frequency pilot sign solid part signal

Single 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 the frequency pilot sign solid part signal

Single order to disturb be zero, thereby offset distracter

In single order disturb and reduce To 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

Emission value and frequency pilot sign solid part signal

Transmitting 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 the frequency pilot sign solid part signal

Transmitting 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 v ₀

As everyone knows, the transmitting site of frequency pilot sign imaginary signals and this frequency pilot sign solid part signal

Transmitting 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

Represent that launches on other seven points in then described eight round dots is data-signal, and uses respectively $a_{m_0-1,n_0-1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},$ $a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}$ With Represent 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 And each data-signal $a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}$ With The emission value.

Step 102: determine the frequency pilot sign imaginary signals

The emission value, make the frequency pilot sign solid part signal Single order to disturb be zero, that is: make

Each data-signal and the frequency pilot sign imaginary signals of launching on each transmitting site of one deck around the transmitting site Right

Interference be zero.

Described definite frequency pilot sign imaginary signals

The derivation of emission value as follows:

Because, on the adjacent transmission position, propagation channel coefficients H _{M, n}Can think constant approx.With described frequency pilot sign solid part signal

Single order disturb and to be designated as

Formula (8) below utilizing and front formula (1) can be with the frequency pilot sign solid part signals to the described principle of formula (7)

The single order that is subjected to disturbs

Be expressed as following formula (9):

${{\mathrm{\&Omega;}}^1}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}\&ap;\mathrm{<figure-callout\; id="0"\; label="j\; H\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">j</figure-callout>}{H}_{m_{}}{{}_0,n_0}_{}{(-1)}^{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1}[A_g({\mathrm{\&tau;}}_0,v_0)(a_{m_0-1,n_0-1}+a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1})+---\left(9\right)$

$A_g({\mathrm{\&tau;}}_0,0)(a_{m_0-1,n_0}-{\mathrm{<figure-callout\; id="0"\; label="a\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">a</figure-callout>}}_{m_{}}+{(-1)}^{n_0}(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1}-{\mathrm{<figure-callout\; id="0"\; label="a\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">a</figure-callout>}}_{m_{}}))]$

Wherein,

Ambiguity function for function g (t).

If ${{\mathrm{\&Omega;}}^1}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}=0,$ Then derive according to formula (9):

$A_g({\mathrm{\&tau;}}_0,v_0)(a_{m_0-1,n_0-1}+a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1})+$

(10)

$A_g({\mathrm{\&tau;}}_0,0)(a_{m_0-1,n_0}-{\mathrm{<figure-callout\; id="0"\; label="a\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">a</figure-callout>}}_{m_{}}+{(-1)}^{n_0}(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}))=0$

In the formula (10), A _g(τ ₀, v ₀) and A _g(τ ₀, 0) and be constant, but calculated in advance obtains.According to formula (10) as seen, utilize and the frequency pilot sign solid part signal

Transmitting 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 ${{\mathrm{\&Omega;}}^1}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}=0$ Condition, if that is: launch this eight signals, can make the frequency pilot sign solid part signal by above-mentioned emission value

The single order that is subjected to disturbs

Be 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: $a_{m_0-1,n_0-1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}$ With

The emission value, can determine in addition some frequency pilot sign imaginary signals

The emission value, make

Be zero, offset the frequency pilot sign solid part signal thereby reach

Distracter

Middle frequency pilot sign solid part signal

The single order that is subjected to disturbs Purpose.

Step 103: 101 frequency pilot sign solid part signals that disposed set by step

Emission value and each data-signal $a_{m_0-1,n_0-1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}$ With

The emission value, emission frequency pilot sign solid part signal And each data-signal $a_{m_0-1,n_0-1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},$ $a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}$ With

And 102 determined frequency pilot sign imaginary signals set by step

Emission value emission frequency pilot sign imaginary signals

According to formula (7), offseting the frequency pilot sign solid part signal

Single order disturb After, receiving terminal is to this (m ₀, n ₀) the transmitting site channel coefficients

Estimated statement be shown:

${\hat{H}}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}=H_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}+\frac{{\mathrm{<figure-callout\; id="0"\; label="I\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">I</figure-callout>}}_{m_{}}\backslash {{\mathrm{\&Omega;}}^1}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0}}{a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}}+\frac{w_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0}}{a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0}}---\left(11\right)$

Wherein,

Expression offsets the frequency pilot sign solid part signal

Single order disturb

Back frequency pilot sign solid part signal

The residual interference that is subjected to.

According to above description as seen, transmitting terminal can only be eliminated the frequency pilot sign solid part signal by method emission pilot symbol signal and each data-signal of prior art

The signal interference ratio of the pilot symbol signal that the interference of single order interference signal, so receiving terminal on every side receives is lower.Undoubtedly, the signal interference ratio of pilot symbol signal has determined the accuracy that propagation channel is estimated.Because the signal interference 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 interference ratio of the pilot symbol signal of propagation channel in estimating, and then improve the accuracy that propagation channel is estimated, guarantees the OQAM systematic function.

For achieving the above object, technical scheme of the present invention is achieved in that

The invention provides 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, determines that the step of the emission value of described each signal comprises:

A. with each signal configures of launching on adjacent two layers around the frequency pilot sign solid part signal transmitting site or the two-layer above transmitting site interference signal for this frequency pilot sign solid part signal;

B. dispose the emission value of each data-signal in the emission value of frequency pilot sign solid part signal and the described interference signal;

C. determine to offset the emission value condition that described interference signal is disturbed,, determine the emission value of frequency pilot sign imaginary signals according to the emission value of this emission value condition and the described data-signal of step B.

Wherein, described interference signal is around the frequency pilot sign solid part signal transmitting site during adjacent two layers, and the transmitting site of adjacent two layers comprises around the described frequency pilot sign solid part signal transmitting site: each transmitting site of the adjacent ground floor and the second layer around the frequency pilot sign solid part signal transmitting site.

Wherein, each transmitting site of the adjacent second layer is around the described frequency pilot sign solid part signal transmitting site: 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 the transmitting site of odd carriers number with the frequency domain coordinate of frequency pilot sign solid part signal transmitting site.

Wherein, the described emission value condition that interference canceled signal is disturbed is:

$A_g({\mathrm{\&tau;}}_0,v_0)(a_{m_0-1,n_0-1}+a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1})+$

$A_g({\mathrm{\&tau;}}_0,0)(a_{m_0-1,n_0}-{\mathrm{<figure-callout\; id="0"\; label="a\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">a</figure-callout>}}_{m_{}}+{(-1)}^{n_0}(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1}))+$

$A_g({2\mathrm{\&tau;}}_0,v_0)(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-2}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2}-a_{m_0-1,n_0-2}-a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2}+$

${(-1)}^{n_0}(a_{m_0-2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}-a_{m_0-2,n_0-1}-{\mathrm{<figure-callout\; id="0"\; label="a\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">a</figure-callout>}}_{m_{}}))=0$

Wherein, m ₀And n ₀Be respectively the frequency domain coordinate and the time domain coordinate of frequency pilot sign solid part signal transmitting site, $a_{m_0-1,n_0-1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1},a_{m_0-2,n_0-1},a_{m_0-2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}$ $a_{m_0-1,n_0-2},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-2},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,n_0-1}$ With Be the emission value of the data-signal launched on the adjacent two layers transmitting site around the frequency pilot sign solid part signal transmitting site,

Be the emission value of frequency pilot sign imaginary signals, τ ₀And v 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.

Among the step B, the emission value of described each data-signal of requirement configuration that transmits according to system.

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.

By such scheme as can be seen, key of the present invention is: be the interference signal of frequency pilot sign solid part signal with each signal configures more than adjacent one deck around the frequency pilot sign solid part signal at first, determine to offset the emission value condition of the interference of described interference signal, offset the emission value of each data-signal in the emission value condition of interference of described interference signal and the pre-configured described interference signal again according to this, determine the emission value of frequency pilot sign imaginary signals, make that described interference signal is zero to the interference of frequency pilot sign solid part signal.

Therefore, the signal transmitting method of OQAM provided by the present invention system, can utilize the frequency pilot sign imaginary signals to offset the interference of the overwhelming majority that the frequency pilot sign solid part signal is subjected to, improve the signal interference ratio be used to carry out the frequency pilot sign solid part 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 and self the second order interference signal.

Embodiment

The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

The emulation experiment data show, the frequency pilot sign solid part signal Distracter

In, main contribution derives from the frequency pilot sign solid part signal

Single order disturb

But frequency pilot sign solid part signal

The signal of launching on the transmitting site around the transmitting site beyond adjacent one deck also can produce about 10% interference.

Consider above factor, the main thought of the inventive method is: at first, and with the frequency pilot sign solid part signal

Each above signal configures of adjacent on every side one deck is the frequency pilot sign solid part signal

Interference signal.Determine to offset the emission value condition of the interference of described interference signal again, and according to pre-configured frequency pilot sign solid part signal

Interference signal in the emission value of each data-signal, determine the frequency pilot sign imaginary signals

The emission value, make that the interference of described interference signal is zero.Here, described interference signal is specially: the frequency pilot sign solid part signal Each signal of launching on the transmitting site around the transmitting site more than adjacent one deck.

According to the rapid fading characteristic of function g (t), generally frequency pilot sign solid part signal

The interference that signal produced of launching on the transmitting site beyond the adjacent two layers around the transmitting site can be ignored substantially, and therefore, described interference signal is configured to usually: the frequency pilot sign solid part signal

Each data-signal and the frequency pilot sign imaginary signals of launching on the adjacent two layers transmitting site around the transmitting site.Described frequency pilot sign solid part signal

Each signal of launching on the transmitting site of adjacent two layers around the transmitting site can be described as the frequency pilot sign solid part signal

The second order interference signal, described frequency pilot sign solid part signal Each signal of launching on the transmitting site of adjacent two layers around the transmitting site is to the frequency pilot sign solid part signal

Interference can be described as the frequency pilot sign solid part signal

Second order interference.At this moment, above-mentioned processing just: determine to offset the emission value condition of described second order interference, and according to this emission value condition and frequency pilot sign solid part signal

The second order interference signal in the emission value of each data-signal, determine the frequency pilot sign imaginary signals

The emission value, can make the frequency pilot sign solid part signal Second order interference be zero.Below in conjunction with Fig. 3 and Fig. 4 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 interference signal is configured to: the frequency pilot sign solid part signal

Each signal of launching on the transmitting site of adjacent two layers around the transmitting site.As shown in Figure 3, the concrete processing comprises:

Step 301: dispose the frequency pilot sign solid part signal by the requirement that system transmits Emission value and frequency pilot sign solid part signal Transmitting site (m ₀, n ₀) the emission value of each data-signal of launching on each transmitting site of adjacent two layers on every side.Here, described frequency pilot sign solid part signal

Each data-signal of launching on each transmitting site of adjacent two layers around the transmitting site comprises: the frequency pilot sign solid part signal

Each data-signal and the frequency pilot sign solid part signal launched on each transmitting site of adjacent ground floor around the transmitting site

Each data-signal of launching on each transmitting site of the adjacent second layer around the transmitting site.

Fig. 4 is the schematic diagram that concerns between frequency pilot sign solid part signal and self the second order interference signal.As shown in Figure 4, black circle is represented the frequency pilot sign solid part signal

Transmitting site (m ₀, n ₀), the round dot that oblique line is filled is represented the frequency pilot sign imaginary signals

Transmitting site (m ₀, n ₀+ 1).Described

Transmitting site (m ₀, n ₀) seven soft dots in adjacent on every side one deck represent the transmitting site of each data-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+ 1, n ₀-1), (m ₀+ 1, n ₀) and (m ₀+ 1, n ₀-1).Described Transmitting site (m ₀, n ₀) 16 round dots in the adjacent on every side second layer represent the transmitting site of each data-signal, their coordinate is respectively: (m ₀-2, n ₀-2), (m ₀-2, n ₀-1), (m ₀-2, n ₀), (m ₀-2, n ₀+ 1), (m ₀-2, n ₀+ 2), (m ₀-1, n ₀-2), (m ₀-1, n ₀+ 2), (m ₀, n ₀-2), (m ₀, n ₀+ 2), (m ₀+ 1, n ₀-2), (m ₀+ 1, n ₀+ 2), (m ₀+ 2, n ₀-2), (m ₀+ 2, n ₀-1), (m ₀+ 2, n ₀), (m ₀+ 2, n ₀+ 1) and (m ₀+ 2, n ₀+ 2).Here, the base unit of time domain coordinate is τ ₀, the base unit of frequency domain coordinate is v ₀

Because,

As the ambiguity function of OQAM system prototype function g (t), and A _g(τ, v) satisfy the described condition of formula (12):

A _g(2nτ ₀，2mv ₀)＝0，(n，m)≠(0，0) (12)

Therefore, differ the even number signal period with the time domain coordinate of frequency pilot sign solid part signal transmitting site, and differ the signal of launching on the transmitting site of even carriers number with the frequency domain coordinate of frequency pilot sign solid part signal transmitting site and can not produce and disturb the frequency pilot sign solid part signal.That is: sign has the signal of the emission on the coordinate position of alphabetical N can't be to (m among Fig. 4 ₀, n ₀) pilot transmitted symbol solid part signal on the position Form and disturb.Therefore, calculating the frequency pilot sign solid part signal

Second order interference the time, just need not to consider to identify each signal of launching on the position of alphabetical N.Each transmitting site of the adjacent second layer all refers to around the frequency pilot sign solid part signal transmitting site of the present invention: 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.

According to the relation of each data-signal of launching on the adjacent two layers transmitting site around frequency pilot sign solid part signal shown in Figure 4, frequency pilot sign imaginary signals and the frequency pilot sign solid part signal transmitting site as can be known, described step 301 is specially: configuration frequency pilot sign solid part signal And each data-signal $a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1},a_{m_0-2,n_0-1},a_{m_0-2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}{a}_{m_0-1,n_0-2}$ $a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-2},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2},a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,n_0-1}$ With

The emission value.

Step 302: determine the frequency pilot sign imaginary signals

The emission value, make the frequency pilot sign solid part signal

Second order interference be zero, that is: make

Each data-signal and the frequency pilot sign imaginary signals of launching on two-layer each transmitting site around the transmitting site

Right Interference be zero.

In this step, at first to determine to offset the emission value condition of described second order interference, if i.e.: each frequency pilot sign solid part signal The emission value of second order interference signal satisfies this emission value condition, then can make the frequency pilot sign solid part signal

Second order interference be zero.

Describedly determine to offset the frequency pilot sign solid part signal

The derivation of the emission value condition of second order interference is as follows:

Because, on the adjacent transmission position, propagation channel coefficients H _{M, n}Can think constant approx.With described frequency pilot sign solid part signal Second order interference be designated as

Then

Be expressed as:

${{\mathrm{\&Omega;}}^2}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}\&ap;\mathrm{<figure-callout\; id="0"\; label="j\; H\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">j</figure-callout>}{H}_{m_{}}{{}_0,n_0}_{}{(-1)}^{n_0}[A_g({\mathrm{\&tau;}}_0,v_0)(a_{m_0-1,n_0-1}+a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1})+$

$A_g({\mathrm{\&tau;}}_0,0)(a_{m_0-1,n_0}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}+{(-1)}^{n_0}(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1}))+$

(13)

$A_g({2\mathrm{\&tau;}}_0,v_0)(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-2}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2}-a_{m_0-1,n_0-2}-a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2}+$

${(-1)}^{n_0}(a_{m_0-2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}-a_{m_0-2,n_0-1}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,n_0-1}))]$

If ${{\mathrm{\&Omega;}}^2}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}=0,$ Then derive:

$A_g({\mathrm{\&tau;}}_0,v_0)(a_{m_0-1,n_0-1}+a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1})+$

$A_g({\mathrm{\&tau;}}_0,0)(a_{m_0-1,n_0}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}+{(-1)}^{n_0}(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0-1}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}))+$

$A_g({2\mathrm{\&tau;}}_0,v_0)(a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,n_0-2}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2}-a_{m_0-1,n_0-2}-a_{m_0-1,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+2}+$

(14)

${(-1)}^{n_0}(a_{m_0-2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}+a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0+1}-a_{m_0-2,n_0-1}-a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0+2,n_0-1}))=0$

In the formula (14), A _g(τ ₀, v ₀), A _g(τ ₀, 0) and A _g(2 τ ₀, v ₀) be constant, but calculated in advance obtains.According to formula (14) as seen, utilize the frequency pilot sign solid part signal

16 points of transmitting site surrounding adjacent two layers in signal emission value on any 15 points, can determine the signal emission value on the another one point, and the emission value of these 16 signals to satisfy formula (14) described ${{\mathrm{\&Omega;}}^2}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}=0$ Condition, if that is: launch this 16 signals, can make the frequency pilot sign solid part signal by above-mentioned emission value

The second order interference that is subjected to

Be zero.

Therefore, formula (14) is and determines the described frequency pilot sign solid part signal that offsets

The emission value condition of second order interference.This step is according to the data signal transmission value of described 15 points of configuration in this emission value condition and the step 301, that is: $a_{m_0-1,n_0-1},a_{m_0-1,n_0+1},a_{m_0+1,n_0-1},a_{m_0+1,n_0+1},a_{m_0-1,n_0},a_{m_0+1,n_0},a_{m_0,n_0-1},$ $a_{m_0-2,n_0-1},a_{m_0-2,n_0+1},a_{m_0-1,n_0-2},a_{m_0-1,n_0+2},a_{m_0+1,n_0-2},a_{m_0+1,n_0+2},a_{m_0+2,n_0-1}$ With

The emission value, can determine the in addition frequency pilot sign imaginary signals of a bit

The emission value, make Be zero, offset the frequency pilot sign solid part signal thereby reach

Distracter

Middle frequency pilot sign solid part signal

The second order interference that is subjected to

Purpose.

Step 303: 301 frequency pilot sign solid part signals that disposed set by step

Emission value and each data-signal of each data-signal $a_{m_0-1,n_0-1},a_{m_0-1,n_0+1},a_{m_0+1,n_0-1},a_{m_0+1,n_0+1},a_{m_0-1,n_0},a_{m_0+1,n_0},a_{m_0,n_0-1},$ $a_{m_0-2,n_0-1},a_{m_0-2,n_0+1},a_{m_0-1,n_0-2},a_{m_0-1,n_0+2},a_{m_0+1,n_0-2},a_{m_0+1,n_0+2},a_{m_0+2,n_0-1}$ With

The emission value, emission frequency pilot sign solid part signal

And each data-signal $a_{m_0-1,n_0-1},a_{m_0-1,n_0+1},a_{m_0+1,n_0-1},$ $a_{m_0+1,n_0+1},a_{m_0-1,n_0},a_{m_0+1,n_0},a_{m_0,n_0-1},a_{m_0-2,n_0-1},a_{m_0-2,n_0+1},a_{m_0-1,n_0-2},a_{m_0-1,n_0-2},a_{m_0+1,n_0-2},$ $a_{m_0+1,n_0+2},a_{m_0+2,n_0-1}$ With

And 302 determined frequency pilot sign imaginary signals set by step

Emission value emission frequency pilot sign imaginary signals

According to formula (7), offseting the frequency pilot sign solid part signal

Second order interference

After, receiving terminal is to this (m ₀, n ₀) channel coefficients of transmitting site

Be estimated as Shown in (15):

${\hat{H}}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}={\mathrm{<figure-callout\; id="0"\; label="H\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">H</figure-callout>}}_{m_{}}+\frac{I_{m_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}\backslash {{\mathrm{\&Omega;}}^2}_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0}}{a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,{\mathrm{<figure-callout\; id="0"\; label="n"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">n</figure-callout>}}_0}}+\frac{{\mathrm{<figure-callout\; id="0"\; label="w\; m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">w</figure-callout>}}_{m_{}}}{a_{{\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="C200510063495E00192.png"\; state="\{\{state\}\}">m</figure-callout>}}_0,n_0}}---\left(15\right)$

Wherein,

Expression offsets the frequency pilot sign solid part signal Second order interference

Back frequency pilot sign solid part signal

The residual interference that is subjected to.

Because, offseting the frequency pilot sign solid part signal

Second order interference After, this frequency pilot sign solid part signal

Distracter In residual interference very little, experiment shows, can eliminate the interference more than 96% that the frequency pilot sign solid part signal is subjected to.Therefore, the signal interference ratio of the frequency pilot sign solid part signal that receiving terminal receives is higher, thereby has improved the accuracy that propagation channel is estimated greatly.

In addition, because being used to propagation channel, the frequency pilot sign solid part signal estimates, generally the transmitting power of frequency pilot sign solid part signal all can be more a lot of greatly than the transmitting power of data-signal, when launching an above frequency pilot sign solid part signal at the same time, if the transmitting site of each pilot symbol signal is misorient, also can have the phase mutual interference between each pilot symbol signal, so the inventive method comprises further: 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.Utilize described formula (12) as can be known, can guarantee not disturb fully between the frequency pilot sign solid part signal as long as satisfy between the transmitting site of each frequency pilot sign solid part 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 emission cycle, and the frequency domain coordinate of the transmitting site of each frequency pilot sign solid part signal differs the even carriers number, thereby has further reduced the interference that the frequency pilot sign solid part signal is subjected to.

In addition, the power of possibility system transmitted data signal is bigger in some cases, then the signal beyond the adjacent two layers just can not have been ignored to the interference of frequency pilot sign solid part signal around the frequency pilot sign solid part signal, at this moment, can be with the interference signal expanded range of frequency pilot sign solid part signal, such as being configured to: each signal of launching on the transmitting site of adjacent three layers or four layers around the frequency pilot sign solid part signal transmitting site, determine the emission value of frequency pilot sign imaginary signals then according to the emission value of each data-signal in this interference signal scope, make that these interference signals are zero to the interference of frequency pilot sign solid part signal.After the interference signal expanded range about the frequency pilot sign solid part signal, the computational process of frequency pilot sign imaginary signals emission value is identical with prior figures 3 described principles, and this paper no longer is described in detail this.

Describe as seen according to the foregoing description, transmitting terminal is used the inventive method can be by the interference signal scope of the rational frequency pilot sign solid part signal of configuration, the frequency pilot sign imaginary signals, and the emission value of each data-signal in the interference signal scope around the frequency pilot sign solid part signal, can offset second order or the above interference of second order that the frequency pilot sign solid part signal is subjected to, thereby significantly improve the signal interference ratio of the frequency pilot sign solid part signal of receiving terminal reception, receiving terminal is estimated propagation channel accurately according to the frequency pilot sign solid part signal that is received, improved the OQAM systematic function on the whole.

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 (6)

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 step of the emission value of described each signal comprises:

A. with each signal configures of launching on adjacent two layers around the frequency pilot sign solid part signal transmitting site or the two-layer above transmitting site interference signal for this frequency pilot sign solid part signal;

B. dispose the emission value of each data-signal in the emission value of frequency pilot sign solid part signal and the described interference signal;

C. determine to offset the emission value condition that described interference signal is disturbed,, determine the emission value of frequency pilot sign imaginary signals according to the emission value of this emission value condition and the described data-signal of step B.

2, method according to claim 1 is characterized in that,

Described interference signal is around the frequency pilot sign solid part signal transmitting site during adjacent two layers,

The transmitting site of adjacent two layers comprises around the described frequency pilot sign solid part signal transmitting site: each transmitting site of the adjacent ground floor and the second layer around the frequency pilot sign solid part signal transmitting site.

3, method according to claim 2, it is characterized in that, each transmitting site of the adjacent second layer is around the described frequency pilot sign solid part signal transmitting site: 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 the transmitting site of odd carriers number with the frequency domain coordinate of frequency pilot sign solid part signal transmitting site.

4, method according to claim 3 is characterized in that, the described emission value condition that interference canceled signal is disturbed is:

$A_g({\mathrm{\&tau;}}_0,v_0)(a_{m_0-1,n_0-1}+a_{m_0-1,n_0+1}+a_{m_0+1,n_0-1}+a_{m_0+1,n_0+1})+$

$A_g({\mathrm{\&tau;}}_0,0)(a_{m_0-1,n_0}-a_{m_0+1,n_0}+{(-1)}^{n_0}(a_{m_0,n_0-1}-a_{m_0,n_0+1}))+$

$A_g(2{\mathrm{\&tau;}}_0,v_0)(a_{m_0+1,n_0-2}+a_{m_0+1,n_0+2}-a_{m_0-1,n_0-2}-a_{m_0-1,n_0+2})+$

${(-1)}^{n_0}(a_{m_0,-2{,n}_0+1}+a_{m_0+2,n_0+1}-a_{m_0-2,n_0-1}-a_{m_0+2,n_0-1}))=0$

Wherein, m ₀And n ₀Be respectively the frequency domain coordinate and the time domain coordinate of frequency pilot sign solid part signal transmitting site,

With Be the emission value of the data-signal launched on the adjacent two layers transmitting site around the frequency pilot sign solid part signal transmitting site,

Be the emission value of frequency pilot sign imaginary signals, τ ₀And v 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.

5, according to each described method of claim 1 to 4, it is characterized in that, among the step B, the emission value of described each data-signal of requirement configuration that transmits according to system.

6, according to each described method of claim 1 to 4, 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.

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