CN106797628A - Double-current launching technique and emitter - Google Patents
Double-current launching technique and emitter Download PDFInfo
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- CN106797628A CN106797628A CN201480081496.8A CN201480081496A CN106797628A CN 106797628 A CN106797628 A CN 106797628A CN 201480081496 A CN201480081496 A CN 201480081496A CN 106797628 A CN106797628 A CN 106797628A
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Abstract
The present invention provides a kind of double-current launching technique and emitter, simultaneous transmission two can be flowed on single radio-frequency channel.The method includes：Emitter modulates the first data flow and the second data flow respectively, the number of the symbol that the set that the symbol generated after being modulated to the first data flow is constituted includes；According to the symbol for pre-setting and the corresponding relation of launching beam, launching beam corresponding with the symbol after the modulation of the first data flow is selected；Use and the symbol mode after the first data flow is modulated is represented with the launching beam for selecting, symbol after first data flow is modulated is launched to receiver by the launching beam of selection, and the symbol mode after being modulated with launching beam the second data flow of carrying for selecting is used, the symbol after the second data flow is modulated is launched to receiver by the launching beam of selection.
Description
The present invention relates to communications technologies, and in particular, to a dual-stream transmission method and a transmitter.
The Multiple-Input Multiple-Output (MIMO) technology can effectively improve the system performance, and has been generally accepted and widely used. According to the MIMO principle, transmission capacity can be increased by increasing the number of antennas. However, in small-sized devices, especially in terminals, the number of antennas cannot be increased at will due to limited space, and thus the capacity cannot be increased by increasing the number of antennas as in a base station.
Spatial Modulation (Spatial Modulation) may transmit multiple data streams via multiple antennas, that is, multiple rf channels may be added to transmit multiple data streams. However, although spatial modulation techniques can reduce the transmit power, the transmitter is required to have more antennas and is not suitable for small devices.
Disclosure of Invention
In order to solve the above problem, embodiments of the present invention provide a dual stream transmission method and a transmitter, which can transmit two streams on a single radio frequency channel simultaneously.
In a first aspect, a dual-stream transmitting method in an embodiment of the present invention includes:
a transmitter respectively modulates a first data stream and a second data stream, and the number of symbols in a set formed by symbols generated after the first data stream is modulated is equal to the total number of transmission beams preset by a single radio frequency channel of the transmitter;
the transmitter selects a transmitting beam corresponding to the symbol modulated by the first data stream according to a preset corresponding relation between the symbol and the transmitting beam;
the transmitter transmits the symbol modulated by the first data stream to a receiver by adopting a symbol mode that the selected transmission beam represents the symbol modulated by the first data stream, and transmits the symbol modulated by the second data stream to the receiver by adopting a symbol mode that the selected transmission beam carries the symbol modulated by the second data stream; and the selected transmitting beam is a transmitting beam corresponding to the symbol modulated by the first data stream.
With reference to the first aspect, in a first possible implementation manner, the method further includes:
the transmitter sends N pilot signals p to the receiver in different beam formsiThe receiver estimates each pilot signal piRespectively corresponding channels HiWherein i ∈ 1, …, N; the N is the total number of the transmitting wave beams in the single radio frequency channel;
the transmitter determines the pilot signal transmitted by the 1 st preferred transmission beam as the pilot signal, and the following conditions are met: wherein i ∈ 1, …, N, HiIs the estimated channel;
the transmitter determines an mth preferred transmit beam transmit pilot signal where Hi' represents HiJ represents the serial number of the channel corresponding to the pilot signal transmitted by the transmitting beam that has been selected, I represents the serial number of the channel corresponding to the pilot signal transmitted by the transmitting beam that has not been selected, α and β are weighting coefficients, respectively, and M is the total number of preferred transmitting beams in the single radio frequency channel.
With reference to the first aspect, or with reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the transmitting, by the selected transmission beam, a symbol modulated by a second data stream includes:
and transmitting the symbol modulated by the second data stream according to the selected transmitting beam in a single carrier mode without a guard interval in front of the data.
With reference to the first aspect, or with reference to the first possible implementation manner of the first aspect, in a third possible implementation manner, the transmitting, by the selected transmission beam, a symbol modulated by a second data stream includes:
and transmitting the symbol modulated by the second data stream according to a single-carrier frequency domain equalization mode through the selected transmitting beam.
With reference to the first aspect, or with reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner, the transmitting, by the selected transmission beam, a symbol modulated by a second data stream includes:
and transmitting the symbol modulated by the second data stream according to a multi-carrier orthogonal frequency division multiplexing mode through the selected transmitting beam.
In a second aspect, an embodiment of the present invention provides a transmitter, including:
a modulator, configured to modulate a first data stream and a second data stream respectively, where the number of symbols included in a set of symbols generated after the first data stream is modulated is equal to the total number of preferred transmission beams preset by a single radio frequency channel of the transmitter;
a processor, configured to select a transmit beam corresponding to the symbol modulated by the first data stream according to a preset correspondence between a symbol and the transmit beam;
a transmitter, configured to transmit the symbol modulated by the first data stream to a receiver through a selected transmission beam in a manner that the selected transmission beam represents the symbol modulated by the first data stream, and transmit the symbol modulated by the second data stream to the receiver through the selected transmission beam in a manner that the selected transmission beam carries the symbol modulated by the second data stream; and the selected transmitting beam is a transmitting beam corresponding to the symbol modulated by the first data stream.
With reference to the second aspect: in a first possible embodiment, the transmitter is further configured to transmit N pilot signals p to the receiver in different beam forms respectivelyiThe receiver estimates each pilot signal piRespectively corresponding channels HiWherein i ∈ 1, …, N; the N is the total number of the transmitting wave beams in the single radio frequency channel;
the processor is further configured to determine that the pilot signal transmitted by the 1 st preferred transmission beam is a pilot signal, where the following conditions are satisfied: wherein i ∈ 1, …, N, HiIs the estimated channel;
the processor is further configured to determine an mth preferred transmit beam transmit pilot signal where Hi' represents HiJ represents transmitted by the transmit beam that has been selectedThe serial number of the channel corresponding to the pilot signal, I represents the serial number of the channel corresponding to the pilot signal transmitted by the non-selected transmission beam, α and β are weighting coefficients respectively, and M is the total number of the preferred transmission beams in the single radio frequency channel.
With reference to the second aspect, or with reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the transmitter is further configured to transmit, through the selected transmission beam, the second data stream modulated symbol in a single carrier manner without a guard interval in front of data.
With reference to the second aspect, or with reference to the first possible implementation manner of the second aspect, in a third possible implementation manner, the transmitter is further configured to transmit, through the selected transmission beam, the second data stream modulated symbol in a single-carrier frequency domain equalization manner.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a fourth or possible implementation manner, the transmitter is further configured to transmit, through the selected transmission beam, a symbol modulated by a second data stream in a multi-carrier orthogonal frequency division multiplexing manner.
For an antenna with a single radio channel, the embodiment of the present invention utilizes a transmission beam of the antenna to transmit a symbol modulated by a first data stream to a receiver in a manner that the transmission beam represents a symbol modulated by the first data stream, and transmits a symbol modulated by a second data stream to the receiver in a manner that the transmission beam currently transmitting the symbol of the first data stream carries the symbol modulated by the second data stream, thereby achieving a purpose of simultaneously transmitting symbols modulated by two data streams by using the same beam at the same time, further achieving a purpose of simultaneously transmitting two data streams by using a plurality of transmission beams of the single radio channel at the same time, reducing the number of antennas of the transmitter, and satisfying a purpose of increasing capacity under a condition of limited space.
Fig. 1 is a flowchart of a dual-stream transmission method according to an embodiment of the present invention;
FIG. 2 is a diagram of the transmission scenario of FIG. 1;
fig. 3 is a schematic structural diagram of a transmitter according to an embodiment of the present invention.
The transmitter in the embodiment of the present invention may be a network side device, for example, a base station, or a user side device, for example, a terminal.
Fig. 1 is a flowchart of a dual-stream transmission method according to an embodiment of the present invention. As shown in fig. 1, the method provided by this embodiment includes:
step 11: the transmitter modulates the first data stream and the second data stream respectively, and the number of symbols included in a set formed by symbols generated after the first data stream is modulated is equal to the total number of preset preferred transmitting beams of a single radio frequency channel of the transmitter.
The transmitter according to the embodiments of the present invention may include an antenna having one radio frequency channel, i.e., a single radio frequency channel. A single radio frequency channel may be configured with multiple transmit beams. For optimal performance of the antenna, the transmitter may select M preferred transmit beams from all transmit beams in advance before transmitting the data stream. In addition, the transmitter needs to set the modulation scheme of each data stream in advance. The first data stream and the second data stream may use the same modulation scheme or different modulation schemes. The Modulation method may be Phase Shift Keying (PSK) Modulation, such as Binary Phase Shift Keying (BPSK) Modulation, Quadrature Phase Shift Keying (QPSK) Modulation, or Quadrature Amplitude Modulation (QAM). The number of symbols included in a set of symbols generated by modulating the first data stream is equal to the number of transmission beams preset by the transmitter. The number of symbols included in the set of symbol components generated by modulating the second data stream may be the same as or different from the number of symbols included in the set of symbol components generated by modulating the first data stream.
For example, the first dataThe set of symbol components generated by modulation is such that the preferred transmit beam selected from all transmit beams of a single radio frequency channel is B ═ B1,B2,…,BMH, a second data stream S2The modulated symbols form a set of N1Equal to the preferred number of transmit beams M. N is a radical of1Number of symbols included in a set of symbols generated by modulating a first data stream, N2Number of symbols included in a set of symbols generated for the second data stream after modulation, N1And N2May be the same or different. For example, the first data stream is BPSK modulated, and the set of symbols generated after the modulation is { +1, -1}, N12; the second data stream adopts QPSK modulation, and the set of symbols generated after modulation is {1+ j,1-j, -1+ j, -1-j }, N2＝4。
Step 12: and the transmitter selects the transmitting beam corresponding to the symbol modulated by the first data stream according to the preset corresponding relation between the symbol and the transmitting beam.
The transmitter also needs to preset the correspondence between the symbols and the transmit beams before transmitting the data stream. The correspondence between a symbol and a transmit beam is used to indicate that the symbol is transmitted in the form of the transmit beam, i.e., the symbol is transmitted in such a way that the transmit beam represents the symbol. For example, the preset correspondence relationship between the symbol and the transmission beam may be that when the first data stream is modulated into the symbol, the kth transmission beam B is adoptedkBy transmitting the representative symbol via the kth transmit beam BkThe symbols are transmitted to the receiver, k ∈ 1, …, M.
Step 13: and the transmitter adopts a symbol mode that the selected transmission beam represents the modulated symbols of the first data stream, transmits the modulated symbols of the first data stream through the selected transmission beam, and adopts a symbol mode that the selected transmission beam carries the modulated symbols of the second data stream, and transmits the modulated symbols of the second data stream through the selected transmission beam. And the selected transmitting beam is the transmitting beam corresponding to the symbol modulated by the first data stream.
The number of symbols included in a set of symbols generated by modulating the first data stream is equal to the number of transmission beams preset by the transmitter. The embodiment of the invention adopts a mode that the transmitting beam represents the symbol modulated by the first data stream, and the symbol modulated by the first data stream is transmitted to the receiver, namely, the symbol modulated by the first data stream is transmitted to the receiver in a beam form.
A method of transmitting symbols modulated by two data streams is illustrated. For example, for the first data stream, the transmitter currently transmits the modulated symbol according to the corresponding relationship between the symbol and the transmission beam, and the transmission beam corresponding to the symbol is the kth transmission beam BkThe transmitter then adopts the kth transmission beam BkAnd representing the mode of the symbol modulated by the first data stream, and adopting a transmitting beam B when the symbol transmitter modulated by the first data stream transmits the symbol modulated by the second data stream to the receiverkA mode for carrying the modulated symbol of the second data stream, a transmitter for transmitting the modulated symbol of the second data stream to a receiver, and a transmitter for transmitting the kth transmission beam B to the receiverkThereafter, the receiver receives the k-th transmission beam BkDue to the kth transmitted beam BkRepresents the modulated symbols of the first data stream and carries the modulated symbols of the second data stream so that the receiver can transmit the k-th transmission beam BkAnalyze the symbol represented by it and the symbol carried by it
The transmitter modulates a first data stream to generate symbols. The transmitter may encapsulate the generated symbols into a plurality of data packets, one of which may include one or more symbols, and transmit the data packets to the receiver. When the transmitter transmits the current data packet of the first data stream, the transmitter determines a transmitting beam corresponding to the symbol encapsulated by the data packet according to the corresponding relation between the preset symbol and the transmitting beam, and transmits the data packet to the receiver through the transmitting beam in a mode that the transmitting beam represents the symbol modulated by the first data stream.
The transmitter modulates the second data streams respectively to generate symbols. Similarly, the transmitter encapsulates the symbols into data packets for transmission to the receiver. And when the transmitter transmits the current data packet corresponding to the second data stream, the transmitter transmits the current data packet corresponding to the second data stream to the receiver by adopting the transmitting beam of the current transmitting first data stream. The number of symbols included in each data packet transmitted by the transmitter is the same regardless of the first data stream or the second data stream, and the transmitter transmits the two data streams to the receiver through the same number of data packets.
The following describes, by way of example, how the symbols of two data streams are transmitted simultaneously over a transmit beam of a single radio frequency channel. As shown in the transmission diagram of fig. 2, a first data stream S1Generating X data packets after modulation and signal selection: s1(1),s1(2)…s1(X), a second data stream S2After modulation and signal selection, X data packets s are generated2(1),s2(2)…s2(X). Then, beam selection is performed, and symbols generated by the first data stream and symbols generated by the second data stream are transmitted to a receiver through the same transmission beam.
Example 1: the set of symbols generated by the first data stream using QPSK modulation is {1+ j,1-j, -1+ j, -1-j }, and the first data stream generates X packets: s1(1),s1(2)…s1(X) the transmission beam is { B1,B2,B3,B4}. The symbol composition set generated by the second data stream by adopting QPSK modulation is {1+ j,1-j, -1+ j, -1-j }, and the second data stream generates X data packets s2(1),s2(2)…s2(X)。
It is assumed that the number of symbols transmitted at a time is 2, that is, the number of symbols included in each data packet transmitted by the transmitter is 2. In the nth transmission, the symbol generated after the modulation of the first data stream is (-1+ j, -1-j), and the corresponding generated data packet is s1(n); the symbol generated after the modulation of the second data stream is (1+ j,1-j), and the corresponding generated data packet is s2(n), wherein n ∈ 1, …, X.
Currently employed to transmit beam B when transmitting the first symbol 1+ j of the second data stream3Representing the square of the first symbol-1 + j of the first data streamBy transmitting a beam B3The first symbol-1 + j of the first data stream is transmitted, and antenna parameters are set according to the symbol-1 + j of the first data stream, for example, parameters such as angle and position of the antenna are set so that the transmission beam is B3Using a transmission beam B3By transmitting the beam B in such a way as to carry the first symbol 1+ j of the second data stream3The first symbol 1+ j of the second data stream is transmitted.
Currently employed to transmit beam B when transmitting the second symbol 1-j of the second data stream4Representing the second symbol-1-j of the first data stream by transmitting beam B4Transmitting a second symbol-1-j of the first data stream, and setting antenna parameters according to the symbol-1-j of the first data stream to enable a transmission beam to be B4Using a transmission beam B4By transmitting beam B in such a way as to carry the second symbol 1-j of the second data stream4The second symbol 1-j of the second data stream is transmitted.
Example 2: the set of symbols generated by BPSK modulation of the first data stream is { +1, -1}, and the first data stream generates X packets: s1(1),s1(2)…s1(X) the transmission beam is { B1,B2}; the second data stream generates X data packets: s2(1),s2(2)…s2(X), the set of symbols generated by the second data stream using QPSK modulation is {1+ j,1-j, -1+ j, -1-j }.
It is assumed that the number of symbols transmitted at a time is 2, that is, the number of symbols included in each data packet transmitted by the transmitter is 2. At the nth transmission, the symbol generated after modulation of the first data stream is (-1, -1), the symbol generated after modulation of the second data stream is (1+ j,1-j), and n ∈ 1, …, X.
When the first symbol 1+ j of the second data stream is transmitted, the currently used transmit beam B is used1Representing the first symbol-1 of the first data stream by transmitting beam B1Transmitting the first symbol-1 of the first data stream, and setting the antenna parameters according to the symbol-1 of the first data stream to make the transmitting beam be B1Using a transmission beam B1Carrying the first symbol 1+ j of the second data stream by sendingBeam B1The first symbol 1+ j of the second data stream is transmitted.
Currently employed to transmit beam B when transmitting the second symbol 1-j of the second data stream2Representing the second symbol-1 of the first data stream by transmitting beam B2Transmitting the second symbol-1 of the first data stream, and setting the antenna parameters according to the second symbol-1 of the first data stream to make the transmission beam be B2Using a transmission beam B2By transmitting beam B in such a way as to carry the second symbol 1-j of the second data stream2The second symbol 1-j of the second data stream is transmitted.
For an antenna with a single radio channel, the embodiment of the present invention utilizes a transmission beam of the antenna to transmit a symbol modulated by a first data stream to a receiver in a manner that the transmission beam represents a symbol modulated by the first data stream, and transmits a symbol modulated by a second data stream to the receiver in a manner that the transmission beam currently transmitting the symbol of the first data stream carries the symbol modulated by the second data stream, thereby achieving a purpose of simultaneously transmitting symbols modulated by two data streams by using the same beam at the same time, further achieving a purpose of simultaneously transmitting two data streams by using a plurality of transmission beams of the single radio channel at the same time, reducing the number of antennas of the transmitter, and satisfying a purpose of increasing capacity under a condition of limited space.
Further, on the basis of the foregoing embodiment, when transmitting the second data stream, the second data stream may be transmitted in a Single carrier mode without a guard interval in front of data, or in a Single-carrier Frequency Domain Equalization (SC-FDE) mode, or in a multi-carrier Orthogonal Frequency Division Multiplexing (OFDM) mode. The OFDM scheme is a scheme of multicarrier transmission. The single carrier without the guard interval in front of the data is also referred to as a legacy single carrier, and the guard interval may be a Cyclic Prefix (CP).
When the second data stream is transmitted according to the traditional single carrier mode, the second data stream is modulated and then subjected to modulationSignal selection generating X data packets s2(1),s2(2)…s2And (X), carrying and transmitting the X data packets of the second data stream to a receiver by transmitting the transmission beam of the symbol modulated by the first data stream.
When the second data stream is transmitted according to the OFDM mode, the second data stream generates X data packets s through signal selection after modulation2(1),s2(2)…s2And (X), performing Inverse Fast Fourier Transform (IFFT) on the X data packets of the second data stream, and adding a Cyclic Prefix (CP) to generate an OFDM data block. And for each symbol in one OFDM data block, carrying and transmitting the symbol modulated by the first data stream to a receiver through a transmitting beam. The second data stream is transmitted in an OFDM manner, and the number of data packets transmitted to the receiver is changed compared to transmitting the second data stream in a conventional single carrier manner.
And transmitting the second data stream according to a single carrier frequency domain equalization SC-FDE mode. The second data stream is modulated and then sent to a signal selector to generate X data packets s2(1),s2(2)…s2(X), the length of the data packet is X + P after the cyclic prefix is added, and X + P data form a frame. And for the nth symbol of one data packet part of the second data stream, carrying and transmitting the nth symbol to a receiver by transmitting the transmission beam of the symbol modulated by the first data stream.
Further, the above-mentioned embodiment uses different symbols modulated by different transmit beam first data streams, and the difference of beam selection may cause the performance of the antenna to be different, and in order to obtain the best performance of the antenna, the embodiment of the present invention further provides a method for selecting M preferred transmit beams from all transmit beams in a single radio frequency channel.
The transmitter may transmit signals using different transmit beams through different configurations, where the different transmit beams correspond to respective independent pilots and channels.
Assuming that the transmitter needs M preferred transmission beams to represent different symbol signals, i.e. symbols modulated by the first data stream, the pilots of the preferred transmission beams are the corresponding channels where j e 1, …, M. The total number of all transmit beams of the single radio frequency channel is N, and M preferred transmit beams may be selected among the N transmit beams of the single radio frequency channel in the following manner:
the first step is as follows: the transmitter sends N pilot signals p to the receiver in different wave beam formsiThe receiver estimates each pilot signal piRespectively corresponding channels HiWhere i ∈ 1, …, N. Suppose that a pilot signal p is transmittediThe beam of (A) is BiThe corresponding channel is Hi。
The second step is that: the transmitter determines the pilot signal transmitted by the 1 st preferred transmission beam as the pilot signal, and the following conditions are satisfied: wherein i ∈ 1, …, N, HiThe resulting channel is estimated in the first step.
Represents the calculation of each piCorresponding to HiMaximum HiThe corresponding pilot signal is the 1 st preferred transmission beam of the transmission pilot signal. The transmitter selects a corresponding transmit beam with the pilot signal.
The third step: the transmitter determines the mth preferred transmission beam transmission pilot signal, wherein M is the total number of preferred transmission beams in the single radio frequency channel, Hi' represents HiJ represents the serial number of the channel corresponding to the pilot signal transmitted by the transmitting beam that has been selected, I represents the serial number of the channel corresponding to the pilot signal transmitted by the transmitting beam that has not been selected, and α and β are weighting coefficients, respectively.
The following describes how the receiver parses the two data streams after the transmitter transmits the two data streams to the receiver through the above-described embodiments. A transmitter transmits a signal to a receiver through one antenna having a single radio frequency channel, and the receiver can receive the signal through a plurality of antennas.
Taking the example that the transmitter transmits the second data stream in the single carrier frequency domain equalization SC-FDE manner, the receiver can obtain the required first data stream s as follows1And a second data stream s2：
The first step is as follows: finding xk(i)，xk(i) Representing the vectors of signals received by the receiver when the k transmit beams were transmitted.
Wherein k is 1,2, … N1，i＝1,2,…N，N1Is the total number of the preferred transmission beams of the transmitter, N is the number of data packets sent by the transmitter, and the k-th transmission signal is a vector xkThe k-th transmitting signal is transmitted by using k transmitting beams.
The second step is that: the ith s is acquired as follows1(i) And s2(i) Estimate of(s)1(i) Data, s, representing a first data stream comprised in a signal vector transmitted by the kth transmission beam2(i) Data representing a second data stream included in the signal vector transmitted by the kth transmit beam. Wherein, i is 1,2, …, N,
represents traversal xkAnd S, the smallest one of which is selected.
If the value obtained after traversal is: i.e. at xkAnd s is smallest in all combinations, then there is that is, by finding the symbol of the second data stream transmitted by the kth transmit beam as i.e., k ═ m2(ii) a Then, according to the corresponding relation between the symbol and the transmitting beam, the m-th beam can be determined2The m-th symbol is used as the corresponding symbol of each transmitting beam2The symbols being transmitted in the form of representations of a single beam, i.e.
In the first step xk(i) The specific calculation method is as follows:
the receiver may represent the following form after removing the CP from the signal received by the mth antenna, and for the convenience of description, it is assumed that only two transmission paths exist from the transmitter to the receiver in the system:
wherein, the channel corresponding to the p path of the mth symbol corresponding to the nth antenna is represented.
IFFT transform matrix is
s＝[s2(1)，s2(2)，s2(N)]TIs the column vector corresponding to the transmitted signal.
Redefining the kth transmitted signal as a vector xk：
Wherein the k-th transmitted signal is represented by lkThe beams are transmitted.
The above equation can be re-expressed as:
FFT transformation of the above equation can result:
the receiver has N receiving antennas, and can be expressed as:
for the ith symbol, it can be expressed as:
if N ≧ N1The above formula can be obtained by ZF or L-MMSE, etc. to obtain corresponding i ═ 1,2, …, n, and performing inverse fourier transform to obtain xk(i)，k＝1，2，…，N1。
As shown in fig. 3, an embodiment of the present invention further provides a transmitter, including: a modulator 31, a processor 32 and a transmitter 33.
The modulator 31 is configured to modulate a first data stream and a second data stream respectively, where the number of symbols included in a set of symbols generated after the first data stream is modulated is equal to the total number of transmission beams preset by a single radio frequency channel of the transmitter.
And the processor 32 is configured to select a transmission beam corresponding to the symbol modulated by the first data stream according to a preset correspondence between the symbol and the transmission beam.
A transmitter 33, configured to transmit the symbol modulated by the first data stream to a receiver through a selected transmission beam in a manner that the selected transmission beam represents the symbol modulated by the first data stream, and transmit the symbol modulated by the second data stream to the receiver through the selected transmission beam in a manner that the selected transmission beam carries the symbol modulated by the second data stream; wherein the selected transmission beam is a preferred transmission beam corresponding to the symbol modulated by the first data stream.
The transmitter provided in this embodiment may be used to implement the dual stream transmission method provided in fig. 1, and the above-mentioned components or can be referred to as the description in the corresponding embodiment of fig. 1.
Illustrating how a transmitter transmitsThe modulated symbols for both data streams. For example, for the first data stream, the transmitter currently transmits the modulated symbol according to the correspondence between the symbol and the preferred transmission beam, and the transmission beam corresponding to the symbol is the kth transmission beam BkThe transmitter then adopts the kth transmission beam BkAnd representing the mode of the symbol modulated by the first data stream, and adopting a transmitting beam B when the symbol transmitter modulated by the first data stream transmits the symbol modulated by the second data stream to the receiverkA mode for carrying the modulated symbol of the second data stream, a transmitter for transmitting the modulated symbol of the second data stream to a receiver, and a transmitter for transmitting the kth transmission beam B to the receiverkThereafter, the receiver receives the k-th transmission beam BkDue to the kth transmitted beam BkRepresents the modulated symbols of the first data stream and carries the modulated symbols of the second data stream so that the receiver can transmit the k-th transmission beam BkAnalyze the symbol represented by it and the symbol carried by it
For an antenna with a single radio channel, the embodiment of the present invention utilizes a transmission beam of the antenna to transmit a symbol modulated by a first data stream to a receiver in a manner that the transmission beam represents a symbol modulated by the first data stream, and transmits a symbol modulated by a second data stream to the receiver in a manner that the transmission beam currently transmitting the symbol of the first data stream carries the symbol modulated by the second data stream, thereby achieving a purpose of simultaneously transmitting symbols modulated by two data streams by using the same beam at the same time, further achieving a purpose of simultaneously transmitting two data streams by using a plurality of transmission beams of the single radio channel at the same time, reducing the number of antennas of the transmitter, and satisfying a purpose of increasing capacity under a condition of limited space.
On the basis of the above embodiments, to obtain the best performance of the antenna, the transmitter provided in the embodiments of the present invention further has a function of selecting M preferred transmission beams from all transmission beams in a single radio frequency channel:
the transmitter 33 is further configured to transmit N pilot signals p to the receiver in different beam formsiThe receiver estimates each pilot signal piRespectively corresponding channels HiWhere i ∈ 1, …, N. N is the total number of transmit beams for a single radio frequency channel.
The processor 32 is further configured to determine that the pilot signal transmitted by the 1 st preferred transmission beam is a pilot signal, where the following condition is satisfied: wherein i ∈ 1, …, N, HiIs the estimated channel.
The processor 32 is further configured to determine an mth preferred transmit beam transmit pilot signal where Hi' represents HiJ represents the sequence number of the channel corresponding to the pilot signal transmitted by the transmission beam that has been selected, I represents the sequence number of the channel corresponding to the pilot signal transmitted by the transmission beam that has not been selected, and α and β are weighting coefficients, respectively.
On the basis of the above embodiment, the second data stream also has multiple transmission modes:
the transmitter 33 is further configured to transmit, through the selected transmission beam, the symbol modulated by the second data stream in a single carrier manner without a guard interval in front of the data. And the transmitter is further configured to transmit the symbol modulated by the second data stream in a single carrier frequency domain equalization manner through the selected transmission beam. The transmitter is further configured to transmit the symbol modulated by the second data stream in a multi-carrier orthogonal frequency division multiplexing manner through the selected transmission beam.
Specifically, when the transmitter transmits the second data stream in the OFDM mode, the second data stream is modulated and then generates X data packets s through signal selection2(1),s2(2)…s2And (X), generating an OFDM data block after the X data packets of the second data stream are subjected to IFFT conversion and CP adding processing. And for each symbol in one OFDM data block, carrying and transmitting the symbol modulated by the first data stream to a receiver through a transmitting beam. The second data stream is transmitted in an OFDM manner, and the number of data packets transmitted to the receiver is changed compared to transmitting the second data stream in a conventional single carrier manner.
The transmitter balances SC-FDE mode according to single carrier frequency domainThe second data stream is transmitted. The second data stream is modulated and then sent to a signal selector to generate X data packets s2(1),s2(2)…s2(X), the length of the data packet is X + P after the cyclic prefix is added, and X + P data form a frame. And for the nth symbol of one data packet part of the second data stream, carrying and transmitting the nth symbol to a receiver by transmitting the transmission beam of the symbol modulated by the first data stream.
It should be noted that the above optional embodiments may be implemented in the same embodiment, may also be implemented in different embodiments, and may be combined as desired.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (12)
- A dual stream transmission method, comprising:a transmitter respectively modulates a first data stream and a second data stream, and the number of symbols in a set formed by symbols generated after the first data stream is modulated is equal to the total number of transmission beams preset by a single radio frequency channel of the transmitter;the transmitter selects a transmitting beam corresponding to the symbol modulated by the first data stream according to a preset corresponding relation between the symbol and the transmitting beam;the transmitter transmits the symbol modulated by the first data stream to a receiver by adopting a symbol mode that the selected transmission beam represents the symbol modulated by the first data stream, and transmits the symbol modulated by the second data stream to the receiver by adopting a symbol mode that the selected transmission beam carries the symbol modulated by the second data stream; and the selected transmitting beam is a transmitting beam corresponding to the symbol modulated by the first data stream.
- The method of claim 1, further comprising, before the transmitter modulates the first data stream and the second data stream, respectively:the transmitter selects a preferred transmission beam from all transmission beams in the single radio frequency channel, the number of symbols included in a set of symbols generated after modulating the first data stream is equal to the total number of the preferred transmission beams of the single radio frequency channel of the transmitter, and the preset correspondence between the symbols and the transmission beams is the preset correspondence between the symbols and the preferred transmission beams.
- The method of claim 2, wherein the transmitter selecting a preferred transmit beam from all transmit beams in the single radio frequency channel comprises:the transmitter sends N pilot signals p to the receiver in different beam formsiThe receiver estimates each pilot signal piRespectively corresponding channels HiWherein i ∈ 1, …, N; the N is the total number of the transmitting wave beams in the single radio frequency channel;the transmitter determines the pilot signal transmitted by the 1 st preferred transmission beam as the pilot signal, and the following conditions are met: wherein i ∈ 1, …, N, HiIs the estimated channel;the transmitter determines the mth preferenceTransmitting a beam of transmission pilot signal of which Hi' represents HiJ represents the serial number of the channel corresponding to the pilot signal transmitted by the transmitting beam that has been selected, I represents the serial number of the channel corresponding to the pilot signal transmitted by the transmitting beam that has not been selected, α and β are weighting coefficients, respectively, and M is the total number of preferred transmitting beams in the single radio frequency channel.
- The method of claim 1,2 or 3, wherein transmitting the second data stream modulated symbols via the selected transmission beam comprises:and transmitting the symbol modulated by the second data stream according to the selected transmitting beam in a single carrier mode without a guard interval in front of the data.
- The method of claim 1,2 or 3, wherein transmitting the second data stream modulated symbols via the selected transmission beam comprises:and transmitting the symbol modulated by the second data stream according to a single-carrier frequency domain equalization mode through the selected transmitting beam.
- The method of claim 1,2 or 3, wherein transmitting the second data stream modulated symbols via the selected transmission beam comprises:and transmitting the symbol modulated by the second data stream according to a multi-carrier orthogonal frequency division multiplexing mode through the selected transmitting beam.
- A transmitter, comprising:a modulator, configured to modulate a first data stream and a second data stream respectively, where the number of symbols included in a set of symbols generated after the first data stream is modulated is equal to the total number of transmission beams preset by a single radio frequency channel of the transmitter;a processor, configured to select, according to a preset correspondence between a symbol and a transmit beam, a preferred transmit beam corresponding to the symbol modulated by the first data stream;a transmitter, configured to transmit the symbol modulated by the first data stream to a receiver through a selected transmission beam in a manner that the selected transmission beam represents the symbol modulated by the first data stream, and transmit the symbol modulated by the second data stream to the receiver through the selected transmission beam in a manner that the selected transmission beam carries the symbol modulated by the second data stream; wherein the selected transmission beam is a preferred transmission beam corresponding to the symbol modulated by the first data stream.
- The transmitter of claim 7, wherein:the processor is further configured to select a preferred transmit beam from all transmit beams in the single radio frequency channel, where the number of symbols included in a set of symbols generated after the first data stream is modulated is equal to the total number of preferred transmit beams of the single radio frequency channel of the transmitter, and a correspondence between the preset symbol and the transmit beam is a correspondence between the preset symbol and the preferred transmit beam.
- The transmitter of claim 8, wherein:the transmitter is further configured to transmit N pilot signals p to the receiver in different beam formsiThe receiver estimates each pilot signal piRespectively corresponding channels HiWherein i ∈ 1, …, N; the N is the total number of the transmitting wave beams in the single radio frequency channel;the processor is further configured to determine that the pilot signal transmitted by the 1 st preferred transmission beam is a pilot signal, where the following conditions are satisfied: wherein i ∈ 1, …, N, HiIs the estimated channel;the processor is further configured to determine an mth preferred transmit beam transmit pilot signal where Hi' represents HiAnd J represents that it has been selectedI represents the serial number of the channel corresponding to the pilot signal transmitted by the non-selected transmission beam, α and β are weighting coefficients respectively, and M is the total number of the preferred transmission beams in the single radio frequency channel.
- The transmitter according to claim 7, 8 or 9, wherein the transmitter is further configured to transmit the second data stream modulated symbols via the selected transmit beam in a single carrier manner without a guard interval in front of data.
- The transmitter according to claim 7, 8 or 9, wherein the transmitter is further configured to transmit the modulated symbols of the second data stream in a single-carrier frequency-domain equalization manner through the selected transmission beam.
- The transmitter according to claim 7, 8 or 9, wherein the transmitter is further configured to transmit the modulated symbols of the second data stream in a multi-carrier orthogonal frequency division multiplexing manner through the selected transmission beam.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2014/086941 WO2016041197A1 (en) | 2014-09-19 | 2014-09-19 | Dual-flow transmission method and transmitter |
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| CN106797628A true CN106797628A (en) | 2017-05-31 |
| CN106797628B CN106797628B (en) | 2019-11-29 |
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| WO2012097862A1 (en) * | 2011-01-17 | 2012-07-26 | Telefonaktiebolaget L M Ericsson (Publ) | An active antenna arrangement for transmitting precoded signals in a communication system, base station, methods and computer programs |
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| EP1987603A4 (en) * | 2006-02-01 | 2014-02-26 | Lg Electronics Inc | A method of transmitting and receiving data using superposition modulation in a wireless communication system |
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| CN101577573A (en) * | 2008-05-09 | 2009-11-11 | 中兴通讯股份有限公司 | Method and device for controlling independent data stream |
| CN101594176A (en) * | 2008-05-27 | 2009-12-02 | 大唐移动通信设备有限公司 | The equipment of dual-layer beam forming method, device and the transmission of support dual-layer beam forming |
| CN101814937A (en) * | 2009-02-19 | 2010-08-25 | 三星电子株式会社 | Apparatus and method for supporting multiple-input multiple-output and beamforming simultaneously in wireless communication system |
| WO2012097862A1 (en) * | 2011-01-17 | 2012-07-26 | Telefonaktiebolaget L M Ericsson (Publ) | An active antenna arrangement for transmitting precoded signals in a communication system, base station, methods and computer programs |
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| CN106797628B (en) | 2019-11-29 |
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