CN101286822B - Transmission method in orthogonal frequency division multiplexing system with MIMO and transceiver thereof - Google Patents
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Abstract
The invention discloses a transmission method used for multi-input and multi-output orthogonal frequency division multiplexing systems and a corresponding transceiver. The emitting process comprises that: multiplexing two groups of signals are obtained from signal layered coding and space frequency block coding is carried out to change the multiplexing two groups of signals into parallel signals; two groups of sub-carrier selection matrices are respectively right multiply the parallel signals of corresponding groups; a Fourier transform is carried out towards signals that are right multiplied, and signals are then transformed into parallel signals to be emitted. The receiving process comprises that: signals are received and transformed into parallel signals; after the Fourier transform is carried out towards the parallel signals, two groups of sub-carrier selection matrices are respectively right multiply parallel signals of corresponding groups to transform the signals into two groups of serial signals and then space-frequency group decoding is carried out; signals that are decoded are combined. The proposal of the invention can effectively suppress group interface and multi-user interface by only adjusting the structure of the transceiver.
Description
Technical Field
The present invention relates to a transceiver technology in the field of mobile communication, and in particular, to a transmission method for a MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system and a transceiver technology.
Background
MIMO (multiple input multiple output) systems can provide both diversity gain and multiplexing gain, and most of the existing MIMO techniques were originally designed to achieve the maximum diversity gain or multiplexing gain. For example, Space-Time codes (STC), including Space-Time Block codes (STBC) or Space-Time Block codes (SFBC) and Space-Time Trellis codes (Space-Time Trellis codes), are designed to obtain maximum diversity gain; the layered space-time codes BLAST and V-BLAST are designed to obtain the maximum multiplexing gain.
The grouped layered space-time structure GLSTBC (layered space-time block coding architecture) combines space-time coding and layered space-time processing, and can perform a good compromise between multiplexing gain and diversity gain. In GLSTBC, the transmit antennas are divided into different groups, and a layered structure is used between groups (partial multiplexing gain can be obtained), while space-time coding is used in each group of transmit antennas (partial diversity gain can be obtained). The GLSTBC can obtain partial multiplexing gain compared to space-time coding, and can obtain partial diversity gain compared to a pure layered space-time structure.
For frequency selective fading channels with intersymbol interference (ISI), GLSTBC may be combined with ofdm (frequency Division multiplexing). OFDM is a very effective way to remove ISI. In the OFDM system, a transmitting end combines inverse fourier transform (IFFT) and cyclic prefix (cyclic prefix), and a receiving end converts a frequency selective fading channel into a group of parallel flat fading sub-channels after cyclic prefix removal and fourier transform (FFT). This makes the equalization at the receiving end very simple, and also makes the space-time coding technique under the flat fading channel applicable to the frequency selective fading channel.
A block diagram of a conventional OFDM system is shown in fig. 1, and includes a serial/parallel conversion unit, an IFFT unit, and a parallel/serial conversion unit. Here, an OFDM system with N subcarriers is taken as an example. Information sequence SDivided into data blocks of length N, the nth data block S (N) ═ S (nN), S (nN +1), …, S (nN + N-1)]T(ii) a Then OFDM modulation is carried out, vector S (N) of dimension N multiplied by IFFT matrix FHThis constitutes one OFDM data block. The frequency selective fading channel is represented by an L-order FIR filter as h: [ h (0), …, h (L)]TWhere h (l) denotes the l-th tap coefficient. In order to eliminate the inter-block interference (ibi) and inter-symbol interference (isi) caused by the channel delay spread, a length L is added before each OFDM data blockCPA cyclic prefix CP (cyclic prefix) of ≧ L, and is removed in the corresponding received data block. This allows the FIR channel vector H to be represented by an N × N circulant matrix H with the element in the p-th row and q-th column of H being [ H ]]p，qH ((p-q) modP). The circulant matrix has a particular property: right multiplying the circulant matrix by FHAfter left-multiplying by F, it can be converted to a diagonal matrix, given by:
D:＝diag(H(0)，…，H(N-1))＝FHFH (1)
wherein, <math><mrow> <mi>H</mi> <mrow> <mo>(</mo> <mi>k</mi> <mo>)</mo> </mrow> <mo>=</mo> <munderover> <mi>Σ</mi> <mrow> <mi>n</mi> <mo>=</mo> <mn>0</mn> </mrow> <mrow> <mi>L</mi> <mo>-</mo> <mn>1</mn> </mrow> </munderover> <mi>h</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mi>exp</mi> <mrow> <mo>(</mo> <mo>-</mo> <mi>j</mi> <mn>2</mn> <mi>πkn</mi> <mo>/</mo> <mi>N</mi> <mo>)</mo> </mrow> <mo>,</mo> </mrow></math> k 0-N-1 corresponds to the frequency response of the channel on the kth subcarrier. Let y (N) ═ y (nN), …, y (nN + N-1)]TRepresents an N x 1-dimensional received data block after FFT at the receiving end, <math><mrow> <mover> <mi>η</mi> <mo>~</mo> </mover> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>:</mo> <mo>=</mo> <msup> <mrow> <mo>[</mo> <mover> <mi>η</mi> <mo>~</mo> </mover> <mrow> <mo>(</mo> <mi>nN</mi> <mo>)</mo> </mrow> <mo>,</mo> <mo>·</mo> <mo>·</mo> <mo>·</mo> <mo>,</mo> <mover> <mi>η</mi> <mo>~</mo> </mover> <mrow> <mo>(</mo> <mi>nN</mi> <mo>+</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>]</mo> </mrow> <mi>T</mi> </msup> </mrow></math> representing an additive white Gaussian noise vector of dimension Nx 1 with a correlation matrix of <math><mrow> <msub> <mi>R</mi> <mover> <mi>η</mi> <mo>~</mo> </mover> </msub> <mo>=</mo> <msub> <mi>N</mi> <mn>0</mn> </msub> <msub> <mi>I</mi> <mi>N</mi> </msub> <mo>,</mo> </mrow></math> Wherein N is0Is the power spectral density of the noise. The OFDM demodulated signal can be expressed as:
y(n)＝DS(n)+η(n) (2)
wherein, <math><mrow> <mi>η</mi> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>:</mo> <mo>=</mo> <msup> <mrow> <mo>[</mo> <mi>η</mi> <mrow> <mo>(</mo> <mi>nN</mi> <mo>)</mo> </mrow> <mo>,</mo> <mo>·</mo> <mo>·</mo> <mo>·</mo> <mo>,</mo> <mi>η</mi> <mrow> <mo>(</mo> <mi>nN</mi> <mo>+</mo> <mi>N</mi> <mo>-</mo> <mn>1</mn> <mo>)</mo> </mrow> <mo>]</mo> </mrow> <mi>T</mi> </msup> <mo>=</mo> <mi>F</mi> <mover> <mi>η</mi> <mo>~</mo> </mover> <mrow> <mo>(</mo> <mi>n</mi> <mo>)</mo> </mrow> <mo>,</mo> </mrow></math> since the FFT matrix is unitary, η (n) is still white noise.
In the space-time processing, STBC coding is mostly adopted, and in the frequency domain, SFBC coding is adopted, and the mathematical principles of the two are the same. In the present invention, we use space-frequency coding SFBC for design convenience. However, one significant characteristic of SFBC is that signals transmitted by each antenna are orthogonal, that is, a signal transmission matrix satisfies: GG (GG)T＝||S1|2+||S2|2+...+|Sn|2I, where I is a unit matrix, S1，S2，...SnAre the signal points employed in the transmit matrix G. When SFBC meets the orthogonality requirement, not only maximum diversity gain is guaranteed, but also decoding complexity is reduced. However, the introduction of the orthogonal relationship also brings the following problems: firstly, the coding gain of the SFBC is only related to the structure of the adopted signal constellation diagram, and no good coding gain optimization method exists at present; secondly, if 2 is adoptedbConstellation of signal points, SFBC band utilization can be achieved only when the transmitting end has two antennasbit/(s·Hz)When the number of antennas increases, the band utilization rate is 3/4 of the maximum value at most. SFBC trades off coding gain and fractional band utilization, as it were, for maximum diversity gain and low coding complexity. Thirdly, the OFDM with cyclic prefix converts a frequency selective fading channel into N parallel flat fading sub-channels, but it is difficult to effectively suppress inter-group interference and multi-user interference.
Disclosure of Invention
The invention aims to provide a transmission method and a transceiver for a multi-input multi-output orthogonal frequency division multiplexing system; the method is suitable for the case of adopting space-frequency block SFBC coding.
The technical scheme adopted by the invention is as follows:
a transmission method for a multiple-input multiple-output orthogonal frequency division multiplexing system, wherein:
the transmitting process comprises the following steps:
A. carrying out layered coding on the transmitted original signals to obtain two groups of multiplexed signals;
B. respectively carrying out space-frequency block coding on the two groups of signals;
C. converting the signals subjected to space-frequency block coding into parallel signals;
D. using two groups of subcarrier selection matrixes to respectively right multiply the parallel signals of the corresponding groups; the two groups of subcarrier selection matrixes are respectively
Carrying out inverse Fourier transform on the right multiplied signal;
E. converting the signals obtained in the previous step into serial signals and then transmitting the serial signals;
the receiving process comprises the following steps:
a. receiving a signal;
b. converting the signals obtained in the last step into parallel signals;
c. after Fourier transformation is carried out on the parallel signals, the two groups of subcarrier selection matrixes are used for respectively right multiplying the parallel signals of the corresponding groups;
d. converting the signals obtained in the last step into two groups of serial signals;
e. performing space-frequency block decoding on the two groups of serial signals respectively;
f. and combining the decoded signals.
Further, step D is followed by: d1, adding a cyclic prefix to the signal after the inverse Fourier transform;
the step a further comprises the following steps: the cyclic prefix of the received signal is removed.
The invention also provides a transmitting method for the MIMO OFDM system, which comprises the following steps:
A. carrying out layered coding on the transmitted original signals to obtain two groups of multiplexed signals;
B. respectively carrying out space-frequency block coding on the two groups of signals;
C. converting the signals subjected to space-frequency block coding into parallel signals;
D. using two groups of subcarrier selection matrixes to respectively right multiply the parallel signals of the corresponding groups; the two groups of subcarrier selection matrixes are respectively
Carrying out inverse Fourier transform on the right multiplied signal;
E. and converting the signal obtained in the previous step into a serial signal and then transmitting the serial signal.
Further, step D is followed by: and D1, adding a cyclic prefix to the signal after the inverse Fourier transform.
The invention also provides a receiving method for the MIMO OFDM system, which comprises the following steps:
a. receiving a signal;
b. converting the signals obtained in the last step into parallel signals;
c. after Fourier transformation is carried out on the parallel signals, two groups of subcarrier selection matrixes are used for respectively right multiplying the parallel signals of the corresponding groups; the two groups of subcarrier selection matrixes are respectively
d. Converting the signals obtained in the last step into two groups of serial signals;
e. performing space-frequency block decoding on the two groups of serial signals respectively;
f. and combining the decoded signals.
Further, the step a further comprises: the cyclic prefix of the received signal is removed.
The invention also provides a transmitter for the MIMO OFDM system, which comprises a vector coding unit, a signal processing unit and a signal processing unit, wherein the vector coding unit is used for carrying out layered coding on original signals to be transmitted to obtain two groups of multiplexed signals; the space-frequency block coding unit is used for respectively carrying out space-frequency block coding on the two groups of signals obtained by the vector coding unit; a serial/parallel conversion unit for converting the signal obtained by the block coding unit into a parallel signal; an inverse Fourier transform unit for performing inverse Fourier transform on the parallel signal obtained by the serial/parallel transform unit; a parallel/serial conversion unit for converting the parallel signal subjected to inverse fourier transform into a serial signal; the transmitting antenna is used for transmitting the serial signals obtained by the parallel/serial conversion unit; the method is characterized in that:
the inverse Fourier transform unit is also used for respectively right multiplying the parallel signals of the corresponding group by two groups of subcarrier selection matrixes before inverse Fourier transform is carried out; the two groups of subcarrier selection matrixes are respectively
Further, the transmitter further includes a cyclic prefix adding unit, configured to add a cyclic prefix to the signal after the inverse fourier transform, and send the cyclic prefix to the parallel/serial conversion unit.
The present invention also provides a receiver for a mimo-ofdm system, comprising: the receiving antenna is used for receiving the signal transmitted by the transmitter; a serial/parallel conversion unit for converting the received signal into a parallel signal; a Fourier transform unit for performing Fourier transform on the parallel signals obtained by the serial/parallel transform unit; a parallel/serial conversion unit for converting the signal obtained by the Fourier conversion unit into a serial signal; a space-frequency block decoding unit for performing space-frequency block decoding on the serial signals obtained by the parallel/serial conversion unit; the signal merging unit is used for merging the signals decoded by the space frequency block decoding unit and outputting the merged signals to subsequent processing equipment; the method is characterized in that:
the Fourier transform unit is also used for multiplying the parallel signals of the corresponding group by the two groups of subcarrier selection matrixes respectively after carrying out Fourier transform on the signals; the two groups of subcarrier selection matrixes are respectively 
Further, the receiver further includes a cyclic prefix removal unit, configured to perform a cyclic prefix removal operation on the signal received by the receiving antenna, and send the signal to the serial/parallel conversion unit.
The scheme of the invention has the following advantages: firstly, the designed MIMO OFDM transceiver only adjusts the structure, does not need extra overhead and has simple structure; secondly, the MIMO OFDM transceiver has small operand and is easy to realize in engineering; thirdly, compared with the traditional device, the MIMO OFDM transceiver can effectively inhibit the inter-group interference and the multi-user interference.
Drawings
FIG. 1 is a block diagram of a conventional OFDM system;
FIG. 2 is a block diagram of a transmitter embodiment of the present invention;
FIG. 3 is a block diagram of a receiver embodiment of the present invention;
fig. 4 is a diagram of simulation effect of the transmitter/receiver of the present invention.
Detailed Description
The technical solution of the present invention will be described in more detail with reference to the accompanying drawings and examples.
The invention aims to adjust the structure of a transceiver, namely a transmitter and a receiver under the condition of not increasing the complexity of the transceiver to obtain a high-efficiency transceiver which is suitable for a MIMO OFDM system adopting space-frequency block SFBC coding and a corresponding transmission method. Compared with the traditional method, the method can effectively inhibit the inter-group interference and the multi-user interference.
The method suitable for the MIMO OFDM system comprises the following steps:
at the time of transmission:
101. for the original signal transmittedS carries out layered coding to obtain two paths of multiplexed signals S1And S2The two paths of signals can also be respectively called as a first group of signals and a second group of signals;
S1＝[S1(0)S1(1)…S1(N-1)] (3)
S2＝[S2(0)S2(1)…S2(N-1)] (4)
102. two signals S obtained by spatial multiplexing1And S2SFBC encoding was performed separately, with the results:
103. converting the SFBC space-frequency block coded signals into parallel signals;
104. after subcarrier allocation is carried out on the parallel signals, IFFT transformation is carried out;
to suppress inter-group interference, different groups S are used using OFDMA ideas1And S2Different subcarriers are selected, and different groups of parallel signals are mapped to different subcarriers. Suppose that the subcarrier selection matrices of the two groups are respectivelyThen there is:
Ikis an identity matrix.
We follow the selection matrix
The sub-carrier allocation is performed in the form of (1). The specific method is to use two groups of subcarrier selection matrixes to respectively right multiply the parallel signals of the corresponding groups, namely
Right-hand multiplying the parallel signal of the first path, i.e. the parallel signal obtained after SFBC coding and serial/parallel conversion of S1Number; by using
Multiplying the parallel signal of the second path right, namely the parallel signal obtained after SFBC coding and serial/parallel conversion of S2;
the signal after right multiplication is subjected to IFFT transformation.
105. Adding a cyclic prefix CP to the signal after IFFT transformation;
106. and converting the converted signal into a serial signal and then transmitting the serial signal.
Upon reception:
201. receiving a signal and removing the CP of the received signal;
the received signals are:
wherein, U represents the transmitted signal, Tcp is the added cyclic prefix matrix, Nm is the noise on the mth receiving antenna;
the received signal is subjected to CP removing operation to obtain:
wherein, Rcp is a cyclic prefix removal matrix;
202. converting the CP-removed signal into a parallel signal;
203. performing FFT on the parallel signals; then, inter-group interference suppression is carried out, and the two groups of subcarrier selection matrixes are used for respectively right multiplying parallel signals of corresponding groups; without loss of generality, taking the first group as an example, the following signals are obtained:
take one receiving antenna as an example:
the situation of the plurality of antennas and the second group can be analogized, and the description is omitted;
204. converting the signal after FFT into a serial signal;
205. SFBC decoding is carried out on the serial signals respectively; since the frequency response variation on two adjacent subcarriers is usually small, it can be assumed that the frequency response of the channel remains unchanged on two adjacent subcarriers:
H1(0)≈H1(1)，…，H1(N-2)≈H1(N-1) (12)
H2(0)≈H2(1)，…，H2(N-2)≈H2(N-1) (13)
it can be decoded using conventional decoding methods:
206. the decoded signals are combined, at which point the signals can be subsequently processed.
As shown in fig. 2, the transmitter for MIMO OFDM system provided in the present invention includes:
a layered coding unit for layered coding the original signal S to be transmitted to obtain two groups of multiplexed signals S1And S2Respectively shown as formulas (3) and (4);
SFBC coding unit for obtaining two-path signal S by vector coding unit1And S2SFBC coding is respectively carried out to obtain matrixes shown in a formula (5);
a serial/parallel conversion unit for converting the signal obtained by the SFBC coding unit into a parallel signal;
an IFFT unit for distributing sub-carrier to the parallel signal obtained by the serial/parallel conversion unit, and using two groups of sub-carrier selection matrixes to respectively right multiply the parallel signal of the corresponding group; the two groups of subcarrier selection matrixes are respectively
Then carrying out IFFT transformation on the right multiplied signal;
a cyclic prefix adding unit for adding a cyclic prefix CP to the signal after IFFT and sending to the parallel/serial conversion unit;
a parallel/serial conversion unit for converting the signal added with the CP into a serial signal and transmitting the serial signal to a transmitting antenna;
and the transmitting antenna is used for transmitting the serial signals obtained by the parallel/serial conversion unit.
As shown in fig. 3, the receiver for MIMO OFDM system provided in the present invention includes:
a receiving antenna: for receiving signals transmitted by a transmitter; the received signal is as shown in equation (8);
a cyclic prefix removing unit, configured to perform CP removing operation on a signal received by a receiving antenna; obtaining a signal as shown in a formula (9);
a serial/parallel conversion unit for converting the signal obtained by the CP removing unit into a parallel signal;
an FFT transforming unit used for carrying out FFT transformation on the parallel signals obtained by the serial/parallel transforming unit and carrying out suppression on the interference between the groups after the FFT transformation, namely, two groups of subcarrier selection matrixes are used for respectively right-multiplying the parallel signals of the corresponding groups;
a parallel/serial conversion unit for converting the signal obtained by the FFT conversion unit into a serial signal;
an SFBC decoding unit for performing SFBC decoding on the serial signals obtained by the parallel/serial conversion unit; the decoding method is shown in formulas (14) and (15);
and the signal merging unit is used for merging the signals decoded by the SFBC decoding unit and outputting the merged signals to subsequent processing equipment.
Fig. 4 is a diagram of simulation effect of the transmitter/receiver of the present invention. The conditions for the simulation were as follows: the channel is a frequency selective slow fading channel, the length of each data block on each transmitting antenna is 256 (i.e., N is 256), the number of IFFT and FFT transform points is 512(K is MN is 2 × 256 is 512), and the length of the cyclic prefix is 3. The noise on the receiving antenna is a complex gaussian random variable (mean 0, variance <math><mrow> <msubsup> <mi>σ</mi> <mi>w</mi> <mn>2</mn> </msubsup> <mo>=</mo> <mn>1</mn> </mrow></math> ). The figure shows the performance comparison with STBC-OFDM and V-BLAST OFDM, and it can be seen that the GLSFBC-OFDM transceiver of the present invention has significantly better effect than the traditional STBC-OFDM and V-BLAST OFDM structures.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A transmission method for a multiple-input multiple-output orthogonal frequency division multiplexing system, wherein:
the transmitting process comprises the following steps:
A. carrying out layered coding on the transmitted original signals to obtain two groups of multiplexed signals;
B. respectively carrying out space-frequency block coding on the two groups of signals;
C. converting the signals subjected to space-frequency block coding into parallel signals;
D. parallel signals of two groups of subcarrier selection matrixes are respectively multiplied right by corresponding groupsNumber; the two groups of subcarrier selection matrixes are respectively
IKIs an identity matrix;
carrying out inverse Fourier transform on the right multiplied signal;
E. converting the signals obtained in the previous step into serial signals and then transmitting the serial signals;
the receiving process comprises the following steps:
a. receiving a signal;
b. converting the signals obtained in the last step into parallel signals;
c. after Fourier transformation is carried out on the parallel signals, the two groups of subcarrier selection matrixes are used for respectively right multiplying the parallel signals of the corresponding groups;
d. converting the signals obtained in the last step into two groups of serial signals;
e. performing space-frequency block decoding on the two groups of serial signals respectively;
f. and combining the decoded signals.
2. The transmission method according to claim 1, wherein said step D is followed by further comprising: d1, adding a cyclic prefix to the signal after the inverse Fourier transform;
the step a further comprises the following steps: the cyclic prefix of the received signal is removed.
3. A transmission method for a multiple-input multiple-output orthogonal frequency division multiplexing system, comprising:
A. carrying out layered coding on the transmitted original signals to obtain two groups of multiplexed signals;
B. respectively carrying out space-frequency block coding on the two groups of signals;
C. converting the signals subjected to space-frequency block coding into parallel signals;
D. using two groups of subcarrier selection matrixes to respectively right multiply the parallel signals of the corresponding groups; the two groups of subcarrier selection matrixes are respectively
IKIs an identity matrix;
carrying out inverse Fourier transform on the right multiplied signal;
E. and converting the signal obtained in the previous step into a serial signal and then transmitting the serial signal.
4. The transmission method of claim 3, further comprising, after step D:
and D1, adding a cyclic prefix to the signal after the inverse Fourier transform.
5. A receiving method for a multiple-input multiple-output orthogonal frequency division multiplexing system, comprising:
a. receiving a signal;
b. converting the signals obtained in the last step into parallel signals;
c. after Fourier transformation is carried out on the parallel signals, two groups of subcarrier selection matrixes are used for respectively right multiplying the parallel signals of the corresponding groups; the two groups of subcarrier selection matrixes are respectively
IKIs an identity matrix;
d. converting the signals obtained in the last step into two groups of serial signals;
e. performing space-frequency block decoding on the two groups of serial signals respectively;
f. and combining the decoded signals.
6. The receiving method as claimed in claim 5, wherein the step a further comprises: the cyclic prefix of the received signal is removed.
7. A transmitter for a multiple-input multiple-output orthogonal frequency division multiplexing system comprises a vector coding unit, a vector decoding unit and a vector decoding unit, wherein the vector coding unit is used for carrying out layered coding on original signals to be transmitted to obtain two groups of multiplexed signals; the space-frequency block coding unit is used for respectively carrying out space-frequency block coding on the two groups of signals obtained by the vector coding unit; a serial/parallel conversion unit for converting the signal obtained by the block coding unit into a parallel signal; an inverse Fourier transform unit for performing inverse Fourier transform on the parallel signal obtained by the serial/parallel transform unit; a parallel/serial conversion unit for converting the parallel signal subjected to inverse fourier transform into a serial signal; the transmitting antenna is used for transmitting the serial signals obtained by the parallel/serial conversion unit; the method is characterized in that:
the inverse Fourier transform unit is also used for respectively right multiplying the parallel signals of the corresponding group by two groups of subcarrier selection matrixes before inverse Fourier transform is carried out; the two groups of subcarrier selection matrixes are respectively 
IKIs an identity matrix.
8. The transmitter of claim 7, further comprising a cyclic prefix adding unit for adding a cyclic prefix to the inverse fourier transformed signal and transmitting to the parallel/serial transforming unit.
9. A receiver for a multiple-input multiple-output orthogonal frequency division multiplexing system, comprising: the receiving antenna is used for receiving the signal transmitted by the transmitter; a serial/parallel conversion unit for converting the received signal into a parallel signal; a Fourier transform unit for performing Fourier transform on the parallel signals obtained by the serial/parallel transform unit; a parallel/serial conversion unit for converting the signal obtained by the Fourier conversion unit into a serial signal; a space-frequency block decoding unit for performing space-frequency block decoding on the serial signals obtained by the parallel/serial conversion unit; the signal merging unit is used for merging the signals decoded by the space frequency block decoding unit and outputting the merged signals to subsequent processing equipment; the method is characterized in that:
the Fourier transform unit is also used for multiplying the parallel signals of the corresponding group by the two groups of subcarrier selection matrixes respectively after carrying out Fourier transform on the signals; the two groups of subcarrier selection matrixes are respectively
IKIs an identity matrix.
10. The receiver of claim 9, further comprising: and the cyclic prefix removing unit is used for performing cyclic prefix removing operation on the signals received by the receiving antenna and then sending the signals to the serial/parallel conversion unit.
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