WO2016041197A1 - 双流发射方法和发射机 - Google Patents

双流发射方法和发射机 Download PDF

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Publication number
WO2016041197A1
WO2016041197A1 PCT/CN2014/086941 CN2014086941W WO2016041197A1 WO 2016041197 A1 WO2016041197 A1 WO 2016041197A1 CN 2014086941 W CN2014086941 W CN 2014086941W WO 2016041197 A1 WO2016041197 A1 WO 2016041197A1
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Prior art keywords
data stream
transmit beam
symbol
transmitter
modulated
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PCT/CN2014/086941
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English (en)
French (fr)
Inventor
卢伟山
吴涛
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480081496.8A priority Critical patent/CN106797628B/zh
Priority to PCT/CN2014/086941 priority patent/WO2016041197A1/zh
Publication of WO2016041197A1 publication Critical patent/WO2016041197A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present invention relates to communication technologies, and in particular, to a dual stream transmission method and a transmitter.
  • MIMO Multiple-Input Multiple-Output
  • the transmission capacity can be increased by increasing the number of antennas.
  • the number of antennas cannot be increased arbitrarily due to space constraints, and thus it is not possible to increase the number of antennas as the base station to achieve the purpose of increasing the capacity.
  • Spatial Modulation technology can transmit multiple data streams through multiple antennas, that is, transmit multiple transmission data streams by adding multiple RF channels.
  • spatial modulation techniques can reduce transmit power, transmitters are required to have more antennas and are not suitable for small devices.
  • the embodiment of the present invention provides a dual stream transmission method and a transmitter, which can simultaneously transmit two streams on a single radio frequency channel.
  • a dual stream transmission method includes:
  • the transmitter separately modulates the first data stream and the second data stream, and the number of symbols included in the set of symbols generated by modulating the first data stream is equal to a preset of a single radio frequency channel of the transmitter.
  • the selected transmit beam carries a symbol pattern modulated by the second data stream, and the second data stream is modulated by the selected transmit beam to the receiver. a symbol; wherein the selected transmit beam is a transmit beam corresponding to a symbol modulated by the first data stream.
  • the foregoing method further includes:
  • the transmitter are transmitted to a different form of a beam to the receiver N pilot signal p i, the receiver estimates the pilot signal p i each corresponding to each channel H i, wherein, i ⁇ 1, ... , N; the N is the total number of transmit beams in the single radio frequency channel;
  • the transmitter determines that the pilot signal transmitted by the first preferred transmit beam is among them, Meet the following conditions: Where i ⁇ 1,...,N,H i are estimated channels;
  • the transmitter determines the mth preferred transmit beam to transmit a pilot signal among them, H i ' represents the transposed conjugate of H i , J represents the sequence number of the channel corresponding to the pilot signal transmitted by the selected transmit beam, and I represents the channel corresponding to the pilot signal transmitted by the selected transmit beam
  • the sequence numbers, ⁇ and ⁇ are weighting coefficients, respectively, and M is the total number of preferred transmit beams in the single radio frequency channel.
  • the second data stream modulated symbol is transmitted by using the selected transmit beam, including:
  • the second data stream modulated symbol is transmitted according to a single carrier manner in which the data is not protected by a guard interval.
  • the second data stream modulated symbol is transmitted by using the selected transmit beam, including:
  • the second data stream modulated symbol is transmitted by using the selected transmit beam, including:
  • an embodiment of the present invention provides a transmitter, including:
  • a modulator for separately modulating the first data stream and the second data stream, for the first data
  • the number of symbols included in the set of symbols generated after the stream is modulated is equal to the total number of preferred transmit beams preset by the single radio frequency channel of the transmitter;
  • a processor configured to select, according to a correspondence between a preset symbol and a transmit beam, a transmit beam corresponding to the symbol modulated by the first data stream;
  • a transmitter for transmitting, by the selected transmit beam, a symbol pattern modulated by the first data stream, transmitting, by the selected transmit beam, the first data stream modulated symbol to a receiver, and adopting
  • the selected transmit beam carries a symbol mode modulated by the second data stream, and the second data stream modulated symbol is transmitted to the receiver by the selected transmit beam; wherein the selected transmit beam is the first The transmit beam corresponding to the symbol modulated by the data stream.
  • the transmitter is further configured to separately send N pilot signals p i to the receiver in different beam forms, and the receiver estimates each The pilot signals p i respectively correspond to a channel H i , where i ⁇ 1 , ..., N; the N is the total number of transmit beams in the single radio frequency channel;
  • the processor is further configured to determine that the pilot signal transmitted by the first preferred transmit beam is among them, Meet the following conditions: Where i ⁇ 1,...,N,H i are estimated channels;
  • the processor is further configured to determine a mth preferred transmit beam to transmit a pilot signal among them, H i ' represents the transposed conjugate of H i , J represents the sequence number of the channel corresponding to the pilot signal transmitted by the selected transmit beam, and I represents the channel corresponding to the pilot signal transmitted by the selected transmit beam
  • the sequence numbers, ⁇ and ⁇ are weighting coefficients, respectively, and M is the total number of preferred transmit beams in the single radio frequency channel.
  • the transmitter is further configured to use the selected transmit beam to protect the data from the front
  • the separated single carrier mode transmits the symbols modulated by the second data stream.
  • the transmitter is further configured to perform single carrier frequency domain equalization by using the selected transmit beam
  • the mode transmits the symbol modulated by the second data stream.
  • the transmitter is further configured to pass the selected transmit beam, according to The multi-carrier orthogonal frequency division multiplexing method transmits the symbols modulated by the second data stream.
  • the embodiment of the present invention uses the transmit beam of the antenna to transmit the symbol modulated by the first data stream to the receiver in a manner that the transmit beam represents the modulated symbol of the first data stream, and transmits the first through the current transmit.
  • the transmit beam of the symbol of the data stream carries the symbol modulated by the second data stream, and the symbol modulated by the second data stream is transmitted to the receiver, thereby realizing simultaneous modulation of two data streams by using the same beam at the same time.
  • the purpose of the symbol in turn, achieves the purpose of using multiple transmit beams of a single radio frequency channel and simultaneously transmitting two data streams at the same time, reducing the number of antennas of the transmitter, and satisfying the improvement in the case of space limitation.
  • the purpose of capacity is the purpose of capacity.
  • FIG. 1 is a flowchart of a dual stream transmission method according to an embodiment of the present invention
  • FIG. 2 is a transmission scene diagram 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 may be a user side device, such as 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 in this embodiment includes:
  • Step 11 The transmitter separately modulates the first data stream and the second data stream, and the number of symbols included in the set of symbols generated by modulating the first data stream is equal to a preset of a single radio frequency channel of the transmitter.
  • the total number of transmit beams is preferred.
  • the transmitter described in the embodiment of the present invention may include an antenna having a radio frequency channel, that is, a single radio frequency channel.
  • a single RF channel can be configured to have multiple transmit beams.
  • the transmitter can select M preferred transmit beams from all transmit beams in advance before transmitting the data stream.
  • the transmitter needs to preset the modulation mode of each data stream.
  • the first data stream and the second data stream may adopt the same modulation method or different modulation methods.
  • the modulation method may be phase shift keying (PSK) modulation, for example, Binary Phase Shift Keying (BPSK).
  • Modulation or Quadrature Phase Shift Keying (QPSK) modulation may also be Quadrature Amplitude Modulation (QAM) modulation.
  • PSK phase shift keying
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keying
  • QAM Quadrature Amplitude Modulation
  • the number of symbols included in the set of symbols generated by modulating the first data stream is equal to the number of transmit 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 the number of symbols included in the set of symbols generated by modulating the first data stream, or may not be the same.
  • the set of symbols generated by the first data stream after modulation is
  • the set of symbols generated after the second data stream S 2 is modulated is
  • N 1 is equal to the preferred number of transmit beams M.
  • N 1 is the number of symbols included in the set of symbols generated by the modulation of the first data stream
  • N 2 is the number of symbols included in the set of symbols generated by the modulation of the second data stream, N 1 It may be the same as or different from N 2 .
  • Step 12 The transmitter selects a transmit beam corresponding to the symbol modulated by the first data stream according to a correspondence between the preset symbol and the transmit beam.
  • the correspondence between the symbol and the transmit beam is used to indicate that the symbol is transmitted in the form of the transmit beam, that is, the symbol is transmitted in such a manner that the transmit beam represents the symbol.
  • the preset symbol and the transmit beam may correspond to each other, and the first data stream is modulated into a symbol.
  • the representative symbol is transmitted with the kth transmit beam B k Way to pass the symbol through the kth transmit beam B k Transmitted to the receiver, k ⁇ 1,...,M.
  • Step 13 The transmitter adopts a symbol pattern modulated by the selected data beam to represent the first data stream, and transmits the modulated symbol of the first data stream by using the selected transmit beam, and adopts the second data stream modulated by the selected transmit beam.
  • the latter symbolic mode transmits the second data stream modulated symbol through the selected transmit beam.
  • the selected transmit beam is a transmit beam corresponding to the symbol modulated by the first data stream.
  • the symbol modulated by the first data stream is transmitted to the receiver in a manner that the transmit beam represents the symbol modulated by the first data stream, that is, the symbol modulated by the first data stream is in the form of a beam. Transmit to the receiver.
  • An example of a method of transmitting symbols modulated by two data streams is illustrated.
  • the transmitter is currently transmitting the modulated symbol.
  • the corresponding transmit beam is the kth transmit beam B k
  • the transmitter uses the kth transmit beam B k to represent the symbol modulated by the first data stream.
  • the transmitter is currently transmitting the second data stream modulated symbol
  • the transmit beam B k is used to carry the second data stream modulated symbol Way of transmitting the second data stream modulated symbol to the receiver
  • the receiver receives the kth transmit beam B k , since the kth transmit beam B k represents the symbol modulated by the first data stream. And it carries the symbol modulated by the second data stream Therefore, the receiver can resolve the symbol it represents by the kth transmit beam B k And the symbols it carries
  • the transmitter modulates the first data stream to generate a symbol.
  • the transmitter may encapsulate the generated symbols into a plurality of data packets for transmission to the receiver, and one data packet may include one or more symbols.
  • the transmitter when transmitting the current data packet of the first data stream, determines a transmit beam corresponding to the symbol encapsulated by the data packet according to a preset symbol and a transmit beam correspondence, and uses the transmit beam to represent the first data stream modulation. The latter symbol is transmitted through the transmit beam to the receiver.
  • the transmitter separately modulates the second data stream to generate a symbol. Similarly, the transmitter encapsulates the symbols into data packets for transmission to the receiver.
  • the transmitter uses the transmit beam that currently transmits the first data stream, and transmits the current data packet corresponding to the second data stream to the receiver. Regardless of whether it is the first data stream or the second data stream, the number of symbols included in the data packet transmitted by the transmitter is the same every time, and the transmitter transmits two data streams to the receiver through the same number of data packets.
  • FIG emission scenario illustrated in Figure 2 a first data stream S 1 After selecting the modulation and the signal X to generate packets: s 1 (1), s 1 (2) ... s 1 (X), a second data After the stream S 2 is modulated and the signal is selected, X packets s 2 (1), s 2 (2) ... s 2 (X) are generated. Then, beam selection is performed, and the symbols generated by the first data stream and the symbols generated by the second data stream are transmitted to the receiver through the same transmit beam.
  • Example 1 The set of symbols formed by QPSK modulation of the first data stream is ⁇ 1+j, 1-j, -1+j, -1-j ⁇ , and the first data stream generates X data packets: s 1 ( 1), s 1 (2)...s 1 (X), the transmit beam is ⁇ B 1 , B 2 , B 3 , B 4 ⁇ .
  • the set of symbols formed by QPSK modulation of the second data stream is ⁇ 1+j, 1-j, -1+j, -1-j ⁇ , and the second data stream generates X data packets s 2 (1), s 2 (2)...s 2 (X).
  • the number of symbols transmitted each time is two, that is, the number of symbols included in each data packet transmitted by the transmitter is two.
  • the symbol generated after the modulation of the first data stream is (-1+j, -1-j), and the corresponding data packet is s 1 (n); the symbol generated after the second data stream is modulated For (1+j, 1-j), the corresponding generated data packet is s 2 (n), where n ⁇ 1, ..., X.
  • the first symbol -1+j sets the antenna parameters according to the symbol -1+j of the first data stream. For example, setting the angle and position of the antenna to make the transmit beam B 3 and the transmit beam B 3 the first two data symbol streams 1 + j manner, transmitting a second data stream of the first symbol 1 + j by the transmit beams B 3.
  • 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 data packets: s 1 (1), s 1 (2)...s 1 ( X), the transmit beam is ⁇ B 1 , B 2 ⁇ ; the second data stream generates X data packets: s 2 (1), s 2 (2)...s 2 (X), and the second data stream is generated by QPSK modulation
  • the set of symbols is ⁇ 1+j, 1-j, -1+j, -1-j ⁇ .
  • each packet transmitted by the transmitter includes 2 symbols.
  • the symbol generated after the modulation of the first data stream is (-1, -1), and the symbol generated after the modulation of the second data stream is (1+j, 1-j), n ⁇ 1,... , X.
  • the currently used to transmit beams B 1 represents a first embodiment of a data symbol streams -1, by transmitting a first data transmission beam B 1 of the first stream symbols -1, -1 is set in accordance with the first data symbol streams so that the parameters of the antenna beams to transmit B 1, + j manner using transmission beam B carries a first symbol of the second data stream 1, by emitting a beam B 1 sends the first symbol 1+j of the second data stream.
  • the embodiment of the present invention uses the transmit beam of the antenna to transmit the symbol modulated by the first data stream to the receiver in a manner that the transmit beam represents the modulated symbol of the first data stream, and transmits the first through the current transmit.
  • the transmit beam of the symbol of the data stream carries the symbol modulated by the second data stream, and the symbol modulated by the second data stream is transmitted to the receiver, thereby realizing simultaneous modulation of two data streams by using the same beam at the same time.
  • the purpose of the symbol in turn, achieves the purpose of using multiple transmit beams of a single radio frequency channel and simultaneously transmitting two data streams at the same time, reducing the number of antennas of the transmitter, and satisfying the improvement in the case of space limitation.
  • the purpose of capacity is the purpose of capacity.
  • the second data stream when the second data stream is transmitted, the second data stream may be sent in a single carrier manner without a guard interval in front of the data, or a single carrier frequency domain equalization may be adopted.
  • the SC-FDE method is used to transmit the second data stream, and the second data stream may also be transmitted by using the Orthogonal Frequency Division Multiplexing (OFDM) method.
  • the OFDM method is a method of multi-carrier transmission.
  • the single carrier with no guard interval in front of the data is also called a traditional single carrier, and the guard interval may be a cyclic prefix (CP).
  • the second data stream When the second data stream is transmitted according to the conventional single carrier mode, the second data stream is modulated and then subjected to signal selection to generate X data packets s 2 (1), s 2 (2)...s 2 (X), and the second data stream
  • the X data packets are transmitted to the receiver by transmitting a transmit beam of the symbol modulated by the first data stream.
  • the second data stream When the second data stream is transmitted according to the OFDM method, the second data stream is modulated and then subjected to signal selection to generate X data packets s 2 (1), s 2 (2)...s 2 (X), and X of the second data stream.
  • the data packet is processed by an inverse fast Fourier transform (IFFT) transform and a cyclic prefix (CP) to generate an OFDM data block.
  • IFFT inverse fast Fourier transform
  • CP cyclic prefix
  • the transmit beam of the symbol modulated by the first data stream For bearer transmission to the receiver.
  • the second data stream is transmitted in accordance with the OFDM method, and the number of data packets transmitted to the receiver is changed as compared with transmitting the second data stream in the conventional single carrier manner.
  • the second data stream is sent according to the single carrier frequency domain equalization SC-FDE mode.
  • the second data stream is modulated and sent to the signal selector to generate X data packets s 2 (1), s 2 (2)...s 2 (X), and the packet length after the cyclic prefix is increased is X+P, X+P
  • the data consists of one frame. For the nth symbol of a packet portion of the second data stream, the transmit beam of the symbol modulated by the first data stream is transmitted and carried to the receiver.
  • the foregoing embodiment uses different symbols of the first data stream modulated by the different transmit beams, and the difference in beam selection may result in different performance of the antenna.
  • the embodiment of the present invention also provides a single radio frequency. A method of selecting M preferred transmit beams among all transmit beams in a channel.
  • the transmitters can transmit signals with different transmit beams through different configurations, wherein different wave transmit beams correspond to independent pilots and channels.
  • the transmitter needs M preferred transmit beams to represent different symbol signals, ie, the first data stream modulated symbols, preferably the transmit beam.
  • the pilot is The corresponding channel is Where j ⁇ 1,...,M.
  • the total number of all transmit beams of a single RF channel is N. You can select M preferred transmit beams among the N transmit beams of a single RF channel as follows:
  • the first step a transmitter are transmitted to a receiver to form different beam N pilot signal p i, for each receiver estimates the pilot signal p i respectively corresponding to the channel H i, wherein, i ⁇ 1, ..., N . It is assumed that the beam transmitting the pilot signal p i is B i and the corresponding channel is H i .
  • Step 2 The transmitter determines that the pilot signal transmitted by the first preferred transmit beam is among them, Meet the following conditions: Where i ⁇ 1,...,N,H i are the estimated channels obtained in the first step.
  • Each represents a calculation corresponding to p i H i, H i corresponding to the largest pilot signal is
  • the transmit beam that transmits the pilot signal is the first superior far transmit beam.
  • the transmitter selects a corresponding transmit beam with a pilot signal.
  • Step 3 The transmitter determines the mth preferred transmit beam to transmit the pilot signal among them, M is the total number of preferred transmit beams in the single radio frequency channel, H i ' represents the transposed conjugate of H i , and J represents the sequence number of the channel corresponding to the pilot signal transmitted by the selected transmit beam, I represents the sequence number of the channel corresponding to the pilot signal transmitted by the selected transmit beam, and ⁇ and ⁇ are weighting coefficients, respectively.
  • the purpose of this selection is to ensure that the interference between adjacent transmit beams is minimized while satisfying the strongest i-th transmit beam power.
  • the transmitter transmits signals to the receiver through an antenna having a single RF channel, and the receiver can receive signals through multiple antennas.
  • the transmitter sends the second data stream according to the single carrier frequency domain equalization SC-FDE mode.
  • the receiver can obtain the required first data stream s 1 and second data stream s 2 as follows:
  • Step 1 Find x k (i), where x k (i) represents the signal vector received by the receiver when the k transmit beams are transmitted.
  • N 1 is the total number of preferred transmit beams of the transmitter
  • N is the number of packets transmitted by the transmitter
  • the kth transmitted signal For the vector x k the kth transmitted signal is transmitted using k transmit beams.
  • the second step use the following way Acquiring an estimate of the ith s 1 (i) and s 2 (i), s 1 (i) representing data of the first data stream included in the signal vector transmitted by the kth transmit beam, s 2 (i) representing The data of the second data stream included in the signal vector transmitted by the kth transmit beam.
  • i 1,2,...,N,
  • the signal received by the receiver from the mth antenna can be expressed as follows after removing the CP. For the convenience of description, it is assumed that there are only two transmission paths from the transmitter to the receiver in the system:
  • the IFFT transformation matrix is
  • the kth transmitted signal is transmitted using 1 k beams.
  • the receiver has N receiving antennas, which can be expressed as:
  • N ⁇ N 1 the above formula can be determined by ZF or L-MMSE.
  • i 1, 2,..., N., pair
  • an embodiment of the present invention further provides a transmitter, including: a modulator 31, a processor 32, and a transmitter 33.
  • a modulator 31 configured to respectively modulate the first data stream and the second data stream, and the number of symbols included in the set of symbols generated by modulating the first data stream is equal to a single radio frequency of the transmitter The total number of transmit beams preset by the channel.
  • the processor 32 is configured to select a transmit beam corresponding to the symbol modulated by the first data stream according to a correspondence between a preset symbol and a transmit beam.
  • a transmitter 33 configured to transmit, by using the selected transmit beam, a symbol pattern modulated by the first data stream, and transmit, by using the selected transmit beam, the first data stream modulated symbol to a receiver, and adopting Transmitting, by the selected transmit beam, a symbol mode modulated by the second data stream, and transmitting, by the selected transmit beam, a second data stream modulated symbol to the receiver; wherein the selected transmit beam is A preferred transmit beam corresponding to a symbol modulated by the data stream.
  • the transmitter provided in this embodiment may be used to implement the dual-stream transmission method provided in FIG. 1.
  • the foregoing may refer to the description in the corresponding embodiment of FIG. 1.
  • a transmitter transmits two data stream modulated symbols. For example, for the first data stream, the transmitter is currently transmitting the modulated symbol. According to the correspondence between symbols and preferred transmit beams, and symbols The corresponding transmit beam is the kth transmit beam B k , and the transmitter uses the kth transmit beam B k to represent the symbol modulated by the first data stream.
  • the transmitter is currently transmitting the second data stream modulated symbol
  • the transmit beam B k is used to carry the second data stream modulated symbol Way of transmitting the second data stream modulated symbol to the receiver
  • the receiver receives the kth transmit beam B k , since the kth transmit beam B k represents the symbol modulated by the first data stream. And it carries the symbol modulated by the second data stream Therefore, the receiver can resolve the symbol it represents by the kth transmit beam B k And the symbols it carries
  • the embodiment of the present invention utilizes the transmit beam of the antenna to modulate the first data stream by the transmit beam representing the symbol pattern modulated by the first data stream.
  • the number is transmitted to the receiver, and the symbol modulated by the second data stream is transmitted to the receiver by the currently transmitted symbol of the symbol of the first data stream, and the symbol modulated by the second data stream is transmitted to the receiver, thereby realizing the same moment.
  • the purpose of simultaneously transmitting the symbols modulated by the two data streams by using the same beam thereby achieving the purpose of using multiple transmit beams of a single radio frequency channel and simultaneously transmitting two data streams at the same time, reducing the number of antennas of the transmitter In the case of limited space, the purpose of increasing capacity is met.
  • the transmitter provided by the embodiment of the present invention further has the function of selecting M preferred transmit beams from all the transmit beams in the single RF channel:
  • the transmitter 33 is further configured to transmit each beam in different forms to the receiver N pilot signal p i, the receiver estimates the pilot signal p i each corresponding to each channel H i, wherein I ⁇ 1,...,N. N is the total number of transmit beams for a single RF channel.
  • the processor 32 is further configured to determine that the pilot signal transmitted by the first preferred transmit beam is among them, Meet the following conditions: Where i ⁇ 1 , ..., N, H i are the estimated channels.
  • the processor 32 is further configured to determine a mth preferred transmit beam to transmit a pilot signal among them, H i ' represents the transposed conjugate of H i , J represents the sequence number of the channel corresponding to the pilot signal transmitted by the selected transmit beam, and I represents the channel corresponding to the pilot signal transmitted by the selected transmit beam
  • the sequence numbers, ⁇ and ⁇ are weighting coefficients, respectively.
  • the second data stream also has multiple transmission modes:
  • the transmitter 33 is further configured to transmit, by using the selected transmit beam, a symbol modulated by the second data stream according to a single carrier manner without a guard interval in front of the data.
  • the transmitter is further configured to transmit, by using the selected transmit beam, a symbol modulated by the second data stream according to a single carrier frequency domain equalization manner.
  • the transmitter is further configured to transmit, by using the selected transmit beam, a symbol modulated by the second data stream according to a multi-carrier orthogonal frequency division multiplexing manner.
  • the second data stream is modulated to generate X data packets s 2 (1), s 2 (2)...s 2 (X), and second.
  • the X data packets of the data stream are subjected to IFFT transform and CP processing to generate OFDM data blocks.
  • the transmit beam of the symbol modulated by the first data stream is transmitted for bearer transmission to the receiver.
  • the second data stream is transmitted in accordance with the OFDM method, and the number of data packets transmitted to the receiver is changed as compared with transmitting the second data stream in the conventional single carrier manner.
  • the transmitter transmits the second data stream according to the single carrier frequency domain equalization SC-FDE mode.
  • the second data stream is modulated and sent to the signal selector to generate X data packets s 2 (1), s 2 (2)...s 2 (X), and the packet length after the cyclic prefix is increased is X+P, X+P
  • the data consists of one frame. For the nth symbol of a packet portion of the second data stream, the transmit beam of the symbol modulated by the first data stream is transmitted and carried to the receiver.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

本发明提供一种双流发射方法和发射机，可以在单射频通道上同时传输两个流。该方法包括：发射机分别调制第一数据流和第二数据流，对第一数据流进行调制后生成的符号组成的集合中包括的符号的个数；根据预先设置的符号与发射波束的对应关系，选择与第一数据流调制后的符号对应的发射波束；采用以选择的发射波束代表第一数据流调制后的符号方式，通过选择的发射波束向接收机发射第一数据流调制后的符号，并采用以选择的发射波束承载第二数据流调制后的符号方式，通过选择的发射波束向接收机发射第二数据流调制后的符号。

Description

双流发射方法和发射机 技术领域
本发明涉及通信技术，尤其涉及一种双流发射方法和发射机。
背景技术
多输入多输出(Multiple-Input Multiple-Output，简称MIMO)技术可以有效地提升系统性能，已经得到普遍认可和广泛应用。根据MIMO原理，通过加大天线数目可以提升传输容量。但在小型设备特别是终端中，由于空间受限，天线数目不能随意增加，从而不能够像基站一样通过增加天线数目来达到提升容量的目的。
空间调制(Spatial Modulation)技术可以通过多个天线传输多个数据流，也就是通过增加多个射频通道的方式传输多个传输数据流。然而，虽然空间调制技术可以减小发射功率，但要求发射机有较多天线，不适用于小型设备。
发明内容
为了解决上述问题，本发明实施例提出了一种双流发射方法和发射机，可以在单射频通道上同时传输两个流。
第一方面、本发明实施例一种双流发射方法，包括：
发射机分别调制第一数据流和第二数据流，对所述第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道预先设置的发射波束的总数；
所述发射机根据预先设置的符号与发射波束的对应关系，选择与所述第一数据流调制后的符号对应的发射波束；
所述发射机采用以选择的发射波束代表所述第一数据流调制后的符号方式，通过所述选择的发射波束向接收机发射所述第一数据流调制后的符号，并采用以所述选择的发射波束承载第二数据流调制后的符号方式，通过所述选择的发射波束向所述接收机发射第二数据流调制后的 符号；其中，所述选择的发射波束为与第一数据流调制后的符号对应的发射波束。
结合第一方面，在第一可能的实施方式中，上述方法还包括：
所述发射机以不同的波束形式分别向所述接收机发送N个导频信号pi，所述接收机估计每个导频信号pi分别对应的信道Hi，其中，i∈1,…,N；所述N为所述单射频通道中的发射波束的总个数；
所述发射机确定第1个优选发射波束发射的导频信号为
Figure PCTCN2014086941-appb-000001
其中，
Figure PCTCN2014086941-appb-000002
满足如下条件：
Figure PCTCN2014086941-appb-000003
其中，i∈1,…,N，Hi为估计得到的信道；
所述发射机确定第m个优选发射波束发射导频信号
Figure PCTCN2014086941-appb-000004
其中，
Figure PCTCN2014086941-appb-000005
Hi'表示Hi的转置共轭，J代表已经被选中的发射波束所发射的导频信号对应的信道的序号，I代表没有被选中的发射波束所发射的导频信号对应的信道的序号，α和β分别为加权系数，M为所述单射频通道中的优选发射波束的总个数。
结合第一方面，或者，结合第一方面的第一种可能的实现方式，在第二种可能的实施方式中，通过所述选择的发射波束发射第二数据流调制后的符号，包括：
通过所述选择的发射波束，按照数据前面不加保护间隔的单载波方式发射第二数据流调制后的符号。
结合第一方面，或者，结合第一方面的第一种可能的实现方式，在第三种可能的实施方式中，通过所述选择的发射波束发射第二数据流调制后的符号，包括：
通过所述选择的发射波束，按照单载波频域均衡方式发射第二数据流调制后的符号。
结合第一方面，或者，结合第一方面的第一种可能的实现方式，在第四种可能的实施方式中，通过所述选择的发射波束发射第二数据流调制后的符号，包括：
通过所述选择的发射波束，按照多载波正交频分复用方式发射第二数据流调制后的符号。
第二方面，本发明实施例提供一种发射机，包括：
调制器，用于分别调制第一数据流和第二数据流，对所述第一数据 流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道预先设置的优选发射波束的总数；
处理器，用于根据预先设置的符号与发射波束的对应关系，选择与所述第一数据流调制后的符号对应的发射波束；
发射器，用于采用以选择的发射波束代表所述第一数据流调制后的符号方式，通过所述选择的发射波束向接收机发射所述第一数据流调制后的符号，并采用以所述选择的发射波束承载第二数据流调制后的符号方式，通过所述选择的发射波束向所述接收机发射第二数据流调制后的符号；其中，所述选择的发射波束为与第一数据流调制后的符号对应的发射波束。
结合第二方面：在第一种可能的实施方式中，所述发射器，还用于以不同的波束形式分别向所述接收机发送N个导频信号pi，所述接收机估计每个导频信号pi分别对应的信道Hi，其中，i∈1,…,N；所述N为所述单射频通道中的发射波束的总个数；
所述处理器，还用于确定第1个优选发射波束发射的导频信号为
Figure PCTCN2014086941-appb-000006
其中，
Figure PCTCN2014086941-appb-000007
满足如下条件：
Figure PCTCN2014086941-appb-000008
其中，i∈1,…,N，Hi为估计得到的信道；
所述处理器，还用于确定第m个优选发射波束发射导频信号
Figure PCTCN2014086941-appb-000009
其中，
Figure PCTCN2014086941-appb-000010
Hi'表示Hi的转置共轭，J代表已经被选中的发射波束所发射的导频信号对应的信道的序号，I代表没有被选中的发射波束所发射的导频信号对应的信道的序号，α和β分别为加权系数，M为所述单射频通道中的优选发射波束的总个数。
结合第二方面，或结合第二方面的第一种可能实施方式，在第二种或能实施方式中，所述发射器，还用于通过所述选择的发射波束，按照数据前面不加保护间隔的单载波方式发射第二数据流调制后的符号。
结合第二方面，或结合第二方面的第一种可能实施方式，在第三种或能实施方式中，所述发射器，还用于通过所述选择的发射波束，按照单载波频域均衡方式发射第二数据流调制后的符号。
结合第二方面，或结合第二方面的第一种可能实施方式，在第四种或能实施方式中，所述发射器，还用于通过所述选择的发射波束，按照 多载波正交频分复用方式发射第二数据流调制后的符号。
对于具有单射通道的天线，本发明实施例利用天线的发射波束，以发射波束代表第一数据流调制后的符号方式将第一数据流调制后的符号发射给接收机，通过当前发射第一数据流的符号的发射波束承载第二数据流调制后的符号的方式，将第二数据流调制后的符号发射给接收机，从而实现了在同一时刻利用同一波束同时发射两个数据流调制后的符号的目的，进而实现了在同一时刻，利用单射频通道的多个发射波束，同时发射两个数据流的目的，减少了发射机的天线个数，在空间受限的情况下满足了提升容量的目的。
附图说明
图1为本发明实施例提供的一种双流发射方法流程图；
图2为图1的发射场景图；
图3为本发明实施例提供的一种发射机结构示意图。
具体实施方式
本发明实施例中的发射机可以是网络侧设备，例如，基站，也可以是用户侧设备，例如终端。
图1为本发明实施例提供的一种双流发射方法流程图。如图1所示，本实施例提供的方法包括：
步骤11：发射机分别调制第一数据流和第二数据流，对第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于发射机的单射频通道的预先设置的优选发射波束的总数。
本发明实施例中所述的发射机可以包括一根天线，该天线具有一个射频通道即单射频通道。单射频通道经过配置可以具有多个发射波束。为获得天线的最佳性能，发射机在发射数据流之前，可以预先从所有发射波束中选择M个优选发射波束。另外、发射机需要预先设置每个数据流的调制方式。第一数据流和第二数据流可以采用相同的调制方式，也可以采用不同的调制方式。调制方式可以是相移键控(Phase Shift Keying，简称PSK)调制，例如，双相相移键控(Binary Phase Shift Keying，简称BPSK) 调制或四相相移键控(Quadrature Phase Shift Keying，简称QPSK)调制，也可以是正交幅度调制(Quadrature Amplitude Modulation，简称QAM)调制。对第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于发射机预先设置的发射波束的个数。对第二数据流进行调制后生成的符号组成的集合中包括的符号的个数，可以与对第一数据流进行调制后生成的符号组成的集合中包括的符号的个数相同，也可以不相同。
举例来说，第一数据流经过调制后生成的符号组成的集合为
Figure PCTCN2014086941-appb-000011
从单射频通道的所有发射波束选择出的优选发射波束为B＝{B1,B2,…,BM}，第二数据流S2经过调制后生成的符号组成的集合为
Figure PCTCN2014086941-appb-000012
其中，N1等于优选发射波束数目M。N1为第一数据流经过调制后生成的符号组成的集合中包括的符号的个数，N2为第二数据流经过调制后生成的符号组成的集合中包括的符号的个数，N1和N2可以相同，也可以不同。例如，第一数据流采用BPSK调制，调制后生成的符号组成的集合为{+1,-1}，N1＝2；第二数据流采用QPSK调制，调制后生成的符号组成的集合为{1+j,1-j,-1+j,-1-j}，N2＝4。
步骤12：发射机根据预先设置的符号与发射波束的对应关系，选择与第一数据流调制后的符号对应的发射波束。
发射机在发射数据流之前，还需要预先设置符号与发射波束之间的对应关系。符号与发射波束之间的对应关系，用于表示该符号以该发射波束形式进行发射，即采用以该发射波束代表该符号的方式发射该符号。例如，预设的符号与发射波束对应关系可以是，第一数据流调制为符号
Figure PCTCN2014086941-appb-000013
时，采用以第k个发射波束Bk发射代表符号
Figure PCTCN2014086941-appb-000014
的方式，通过第k个发射波束Bk将符号
Figure PCTCN2014086941-appb-000015
发射到接收机，k∈1,…,M。
步骤13：发射机采用以选择的发射波束代表第一数据流调制后的符号方式，通过选择的发射波束发射第一数据流调制后的符号，并采用以选择的发射波束承载第二数据流调制后的符号方式，通过选择的发射波束发射第二数据流调制后的符号。其中，选择的发射波束为与第一数据流调制后的符号对应的发射波束。
对第一数据流进行调制后生成的符号组成的集合中包括的符号的 个数，等于发射机预先设置的发射波束的个数。本发明实施例采用以发射波束代表第一数据流调制后的符号的方式，将第一数据流调制后的符号发射给接收机，也就是说，将第一数据流调制后的符号以波束形式发射给接收机。
举例说明发射两个数据流调制后的符号的方法。例如，对于第一数据流，发射机当前发射的是调制后的符号
Figure PCTCN2014086941-appb-000016
根据符号与发射波束之间的对应关系，与符号
Figure PCTCN2014086941-appb-000017
对应的发射波束为第k个发射波束Bk，则发射机采用以第k个发射波束Bk,代表第一数据流调制后的符号
Figure PCTCN2014086941-appb-000018
的方式，向接收机发射第一数据流调制后的符号
Figure PCTCN2014086941-appb-000019
发射机当前在发射第二数据流调制后的符号
Figure PCTCN2014086941-appb-000020
时，则采用发射波束Bk承载第二数据流调制后的符号
Figure PCTCN2014086941-appb-000021
的方式，向接收机发射第二数据流调制后的符号
Figure PCTCN2014086941-appb-000022
发射机向接收机发射第k个发射波束Bk后，接收机接收到第k个发射波束Bk，由于第k个发射波束Bk代表第一个数据流调制后的符号
Figure PCTCN2014086941-appb-000023
并且其承载第二数据流调制后的符号
Figure PCTCN2014086941-appb-000024
因此，接收机可以通过第k个发射波束Bk解析出其代表的符号
Figure PCTCN2014086941-appb-000025
以及其承载的符号
Figure PCTCN2014086941-appb-000026
发射机对第一数据流进行调制后生成符号。发射机可以将生成的符号封装成多个数据包发射给接收机，一个数据包可以包括一个或多个符号。发射机在发射第一数据流的当前数据包时，根据预设的符号与发射波束对应关系，确定与该数据包封装的符号相对应的发射波束，采用以该发射波束代表第一数据流调制后的符号的方式，通过该发射波束将该数据包发射给接收机。
发射机对第二数据流分别进行调制后生成符号。同样，发射机将符号封装成数据包发射给接收机。发射机在发射第二数据流对应的当前数据包时，采用当前发射第一数据流的发射波束，将第二数据流对应的当前数据包发射给接收机。不论是第一数据流还是第二数据流，发射机每次发送的数据包中包括的符号的个数均相同，且发射机通过相同个数的数据包分别向接收机发射两个数据流。
下面通过举例描述如何通过单射频通道的发射波束同时发送两个数据流的符号。如图2所示的发射场景图，第一数据流S1经过调制后和信号选择后生成X个数据包：s1(1),s1(2)…s1(X)，第二数据流S2经过调制 后和信号选择后生成X个数据包s2(1),s2(2)…s2(X)。然后，进行波束选择，通过相同的发射波束将第一数据流生成的符号和第二数据流生成的符号发射给接收机。
例1：第一数据流采用QPSK调制生成的符号组成的集合为{1+j,1-j,-1+j,-1-j}，第一数据流生成X个数据包：s1(1),s1(2)…s1(X)，发射波束为{B1,B2,B3,B4}。第二数据流采用QPSK调制生成的符号组成的集合为{1+j,1-j,-1+j,-1-j}，第二数据流生成X个数据包s2(1),s2(2)…s2(X)。
假设每次发送的符号的数目为2，也就是，发射机发射的每个数据包包括的符号的数目为2。在第n次发送时，第一数据流调制后产生的符号为(-1+j,-1-j)，对应生成的数据包为s1(n)；第二数据流调制后产生的符号为(1+j,1-j)，对应生成的数据包为s2(n)，其中，n∈1,…,X。
在发送第二数据流的第一个符号1+j时，当前采用以发射波束B3代表第一数据流的第一个符号-1+j的方式，通过发射波束B3发送第一数据流的第一个符号-1+j，则根据第一数据流的符号-1+j设置天线参数，例如，设置天线的角度和位置等参数使发射波束为B3，采用发射波束B3承载第二数据流的第一个符号1+j的方式，通过发射波束B3发送第二数据流的第一个符号1+j。
在发送第二数据流的第二个符号1-j时，当前采用以发射波束B4，代表第一数据流的第二符号-1-j的方式，通过发射波束B4发送第一数据流的第二符号-1-j，则根据第一数据流的符号-1-j设置天线参数使发射波束为B4，采用发射波束B4承载第二数据流的第二个符号1-j的方式，通过发射波束B4发送第二数据流的第二个符号1-j。
例2：第一数据流采用BPSK调制生成的符号组成的集合为{+1,-1}，第一数据流生成X个数据包：s1(1),s1(2)…s1(X)，发射波束为{B1,B2}；第二数据流生成X个数据包：s2(1),s2(2)…s2(X)，第二数据流采用QPSK调制生成的符号组成的集合为{1+j,1-j,-1+j,-1-j}。
假设每次发送的符号的数目为2，也就是，发射机发射的每个数据包包括的符号个数为2。在第n次发送时，第一数据流调制后产生的符号为(-1,-1)，第二数据流调制后产生的符号为(1+j,1-j),n∈1,…,X。
发送第二数据流的第一个符号1+j时，当前采用以发射波束B1代表 第一数据流的第一个符号-1的方式，通过发射波束B1发送第一数据流的第一个符号-1，则根据第一数据流的符号-1设置天线参数使发射波束为B1，采用发射波束B1承载第二数据流的第一个符号1+j的方式，通过发射波束B1发送第二数据流的第一个符号1+j。
发送第二数据流的第二个符号1-j时，当前采用以发射波束B2代表第一数据流的第二个符号-1的方式，通过发射波束B2发送第一数据流的第二个符号-1，则根据第一数据流的第二个符号-1设置天线参数使发射波束为B2，采用发射波束B2承载第二数据流的第二个符号1-j的方式，通过发射波束B2发送第二数据流的第二个符号1-j。
对于具有单射通道的天线，本发明实施例利用天线的发射波束，以发射波束代表第一数据流调制后的符号方式将第一数据流调制后的符号发射给接收机，通过当前发射第一数据流的符号的发射波束承载第二数据流调制后的符号的方式，将第二数据流调制后的符号发射给接收机，从而实现了在同一时刻利用同一波束同时发射两个数据流调制后的符号的目的，进而实现了在同一时刻，利用单射频通道的多个发射波束，同时发射两个数据流的目的，减少了发射机的天线个数，在空间受限的情况下满足了提升容量的目的。
进一步，上述实施例的基础上，在发射第二数据流时，可以采用数据前面不加保护间隔的单载波方式发送第二数据流，也可以采用单载波频域均衡(Single-carrier Frequency Domain Equalization，简称SC-FDE)方式发送第二数据流，还可以采用多载波正交频分复用(Orthogonal Frequency Division Multiplexing，简称OFDM)方式发送第二数据流。OFDM方式是多载波发送的一种方式。其中，为数据前面不加保护间隔的单载波也称为传统的单载波，保护间隔可以是循环前缀(CP)。
按照传统的单载波方式发送第二数据流时，第二数据流经过调制后经过信号选择生成X个数据包s2(1),s2(2)…s2(X)，第二数据流的X个数据包，通过发送第一数据流调制后的符号的发射波束进行承载发射给接收机。
按照OFDM方式发送第二数据流时，第二数据流经过调制后经过信号选择生成X个数据包s2(1),s2(2)…s2(X)，第二数据流的X个数据包经过快速傅立叶逆变换(Inverse fast Fourier transform，简称IFFT)变换 和加循环前缀(CP)处理后生成OFDM数据块。对于一个OFDM数据块中的每一个符号，通过发送第一数据流调制后的符号的发射波束进行承载发射给接收机。按照OFDM方式发送第二数据流，与按照传统的单载波方式发送第二数据流相比，向接收机发送的数据包的个数发生了变化。
按照单载波频域均衡SC-FDE方式发送第二数据流。第二数据流经过调制后送往信号选择器生成X个数据包s2(1),s2(2)…s2(X)，增加循环前缀后数据包长度为X+P，X+P个数据组成一个帧。对于第二数据流一个数据包部分的第n个符号，通过发送第一数据流调制后的符号的发射波束进行承载发射给接收机。
进一步，上述实施例采用不同的发射波束第一数据流调制后的不同符号，而波束选择的不同会导致天线的性能不同，为获得天线的最佳性能，本发明实施例还提供了从单射频通道中的所有发射波束中选择M个优选发射波束的方法。
发射机通过不同的配置，可以采用不同的发射波束发送信号，其中不同的波发射束对应各自独立的导频和信道。
假定发射机需要M个优选发射波束代表不同的码元信号即第一数据流调制后的符号，优选发射波束
Figure PCTCN2014086941-appb-000027
的导频为
Figure PCTCN2014086941-appb-000028
相应的信道为
Figure PCTCN2014086941-appb-000029
其中j∈1,…,M。单射频通道的所有发射波束的总个数为N，可以按以下方式在单射频通道的N个发射波束中选择M个优选发射波束:
第一步：发射机以不同的波束形式分别向接收机发送N个导频信号pi，接收机估计每个导频信号pi分别对应的信道Hi，其中，i∈1,…,N。假定发送导频信号pi的波束为Bi，对应信道为Hi。
第二步：发射机确定第1个优选发射波束发射的导频信号为
Figure PCTCN2014086941-appb-000030
其中，
Figure PCTCN2014086941-appb-000031
满足如下条件：
Figure PCTCN2014086941-appb-000032
其中，i∈1,…,N，Hi为第一步中估计所得到的信道。
Figure PCTCN2014086941-appb-000033
表示计算每一个pi对应的Hi，最大的Hi对应的导频信号就是
Figure PCTCN2014086941-appb-000034
发射导频信号的发射波束为第1个优远发射波束。发射机以导频信号选择对应的发射波束。
第三步：发射机确定第m个优选发射波束发射导频信号
Figure PCTCN2014086941-appb-000035
其中，
Figure PCTCN2014086941-appb-000036
M为为所述单射频通道中的优选发射波束的总个数，Hi'表示Hi的转置共轭，J代表已经被选中的发射波束所发射的导频信号对应的信道的序号，I代表没有被选中的发射波束所发射的导频信号对应的信道的序号，α和β分别为加权系数。这样选择的目的是在满足第i个发射波束功率最强的同时，保证相邻发射波束之间干扰最小。
以下说明发射机通过上述实施例向接收机发射两个数据流后，接收机如何解析两个数据流。发射机通过具有单射频通道的一根天线向接收机发射信号，而接收机可以通过多个天线接收信号。
以发射机按照单载波频域均衡SC-FDE方式发送第二数据流为例，接收机可以按如下方式获取所需要的第一数据流s1和第二数据流s2：
第一步：求出xk(i)，xk(i)表示k个发射波束发射时接收机接收到的信号矢量。
其中，k＝1,2,…N1，i＝1,2,…N，N1为发射机的优选发射波束的总数，N为发射机发送的数据包的个数，第k个发射信号为矢量xk，第k个发射信号是采用k个发射波束发射。
第二步：用如下方式
Figure PCTCN2014086941-appb-000037
获取第i个s1(i)和s2(i)的估值，s1(i)表示第k个发射波束发射的信号矢量中包括的第一数据流的数据，s2(i)表示第k个发射波束发射的信号矢量中包括的第二数据流的数据。其中，i＝1，2，…，N，
Figure PCTCN2014086941-appb-000038
Figure PCTCN2014086941-appb-000039
表示遍历xk和S的各种组合，选择其中最小的一个。
如果遍历后获得的值为：
Figure PCTCN2014086941-appb-000040
即
Figure PCTCN2014086941-appb-000041
在xk和s的所有的组合中最小，则有
Figure PCTCN2014086941-appb-000042
也就是说，通过
Figure PCTCN2014086941-appb-000043
找到第k个发射波束发射的第二数据流的符号为
Figure PCTCN2014086941-appb-000044
即
Figure PCTCN2014086941-appb-000045
并且k＝m2；然后，根据符号与发射波束之间的对应关系，可以确定与第m2个发射波束对应符号为
Figure PCTCN2014086941-appb-000046
则
Figure PCTCN2014086941-appb-000047
即以第m2个波束代表
Figure PCTCN2014086941-appb-000048
的形式发送符号
Figure PCTCN2014086941-appb-000049
即
Figure PCTCN2014086941-appb-000050
第一步中xk(i)的具体计算方法如下：
接收机从第m根天线接收到的信号去除CP后可以表示为如下形 式，为了描述方便，假定系统中发射机到接收机只存在两条传输路径：
Figure PCTCN2014086941-appb-000051
其中
Figure PCTCN2014086941-appb-000052
代表第n根天线对应的第m个符号第p径上对应的信道。
IFFT变换矩阵为
Figure PCTCN2014086941-appb-000053
s＝[s2(1)，s2(2)，s2(N)]T为发射信号对应的列矢量。
重新定义第k个发射信号为矢量xk：
Figure PCTCN2014086941-appb-000054
其中第k个发射信号是采用lk个波束发射。
则上式可以重新表达为：
Figure PCTCN2014086941-appb-000055
对上式进行FFT变换可以得到：
Figure PCTCN2014086941-appb-000056
接收机有N个接收天线，则可以表示为：
Figure PCTCN2014086941-appb-000057
对于其中的第i个符号，可以表示为：
Figure PCTCN2014086941-appb-000058
如果N≥N1，则上式可以通过ZF或L-MMSE等方法求出对应的
Figure PCTCN2014086941-appb-000059
其中i＝1，2，…，N.，对
Figure PCTCN2014086941-appb-000060
作反傅里叶变换即可以获得xk(i)，k＝1，2，…，N1。
如图3所示，本发明实施例还提供一种发射机，包括：调制器31、处理器32和发射器33。
调制器31，用于分别调制第一数据流和第二数据流，对所述第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道预先设置的发射波束的总数。
处理器32，用于根据预先设置的符号与发射波束的对应关系，选择与所述第一数据流调制后的符号对应的发射波束。
发射器33，用于采用以选择的发射波束代表所述第一数据流调制后的符号方式，通过所述选择的发射波束向接收机发射所述第一数据流调制后的符号，并采用以所述选择的发射波束承载第二数据流调制后的符号方式，通过所述选择的发射波束向所述接收机发射第二数据流调制后的符号；其中，所述选择的发射波束为与第一数据流调制后的符号对应的优选发射波束。
本实施例提供的发射机可以用于实现图1提供的双流传输方法，上述各器件的或能可参见图1对应实施例中的描述。
举例说明发射机如何发射两个数据流调制后的符号。例如，对于第一数据流，发射机当前发射的是调制后的符号
Figure PCTCN2014086941-appb-000061
根据符号与优选发射波束之间的对应关系，与符号
Figure PCTCN2014086941-appb-000062
对应的发射波束为第k个发射波束Bk，则发射机采用以第k个发射波束Bk,代表第一数据流调制后的符号
Figure PCTCN2014086941-appb-000063
的方式，向接收机发射第一数据流调制后的符号
Figure PCTCN2014086941-appb-000064
发射机当前在发射第二数据流调制后的符号
Figure PCTCN2014086941-appb-000065
时，则采用发射波束Bk承载第二数据流调制后的符号
Figure PCTCN2014086941-appb-000066
的方式，向接收机发射第二数据流调制后的符号
Figure PCTCN2014086941-appb-000067
发射机向接收机发射第k个发射波束Bk后，接收机接收到第k个发射波束Bk，由于第k个发射波束Bk代表第一个数据流调制后的符号
Figure PCTCN2014086941-appb-000068
并且其承载第二数据流调制后的符号
Figure PCTCN2014086941-appb-000069
因此，接收机可以通过第k个发射波束Bk解析出其代表的符号
Figure PCTCN2014086941-appb-000070
以及其承载的符号
Figure PCTCN2014086941-appb-000071
对于具有单射通道的天线，本发明实施例利用天线的发射波束，以发射波束代表第一数据流调制后的符号方式将第一数据流调制后的符 号发射给接收机，通过当前发射第一数据流的符号的发射波束承载第二数据流调制后的符号的方式，将第二数据流调制后的符号发射给接收机，从而实现了在同一时刻利用同一波束同时发射两个数据流调制后的符号的目的，进而实现了在同一时刻，利用单射频通道的多个发射波束，同时发射两个数据流的目的，减少了发射机的天线个数，在空间受限的情况下满足了提升容量的目的。
在上述实施例的基础上，为获得天线的最佳性能，本发明实施例提供的发射机还具有从单射频通道中的所有发射波束中选择M个优选发射波束的功能:
所述发射器33，还用于以不同的波束形式分别向所述接收机发送N个导频信号pi，所述接收机估计每个导频信号pi分别对应的信道Hi，其中，i∈1,…,N。N为单射频通道的发射波束的总个数。
所述处理器32，还用于确定第1个优选发射波束发射的导频信号为
Figure PCTCN2014086941-appb-000072
其中，
Figure PCTCN2014086941-appb-000073
满足如下条件：
Figure PCTCN2014086941-appb-000074
其中，i∈1,…,N，Hi为估计得到的信道。
所述处理器32，还用于确定第m个优选发射波束发射导频信号
Figure PCTCN2014086941-appb-000075
其中，
Figure PCTCN2014086941-appb-000076
Hi'表示Hi的转置共轭，J代表已经被选中的发射波束所发射的导频信号对应的信道的序号，I代表没有被选中的发射波束所发射的导频信号对应的信道的序号，α和β分别为加权系数。
在上述实施例的基础上，第二数据流还具有多种发射方式：
所述发射器33，还用于通过所述选择的发射波束，按照数据前面不加保护间隔的单载波方式发射第二数据流调制后的符号。所述发射器，还用于通过所述选择的发射波束，按照单载波频域均衡方式发射第二数据流调制后的符号。所述发射器，还用于通过所述选择的发射波束，按照多载波正交频分复用方式发射第二数据流调制后的符号。
具体地，发射器按照OFDM方式发送第二数据流时，第二数据流经过调制后经过信号选择生成X个数据包s2(1),s2(2)…s2(X)，第二数据流的X个数据包经过IFFT变换和加CP处理后生成OFDM数据块。对于一个OFDM数据块中的每一个符号，通过发送第一数据流调制后的符号的发射波束进行承载发射给接收机。按照OFDM方式发送第二数据流， 与按照传统的单载波方式发送第二数据流相比，向接收机发送的数据包的个数发生了变化。
发射器按照单载波频域均衡SC-FDE方式发送第二数据流。第二数据流经过调制后送往信号选择器生成X个数据包s2(1),s2(2)…s2(X)，增加循环前缀后数据包长度为X+P，X+P个数据组成一个帧。对于第二数据流一个数据包部分的第n个符号，通过发送第一数据流调制后的符号的发射波束进行承载发射给接收机。
需要说明的是，上述可选的实施方式可以在同一个实施例中实施，也可以在不同的实施例中实施，可以随意组合。
本领域普通技术人员可以理解：实现上述各方法实施例的全部或部分步骤可以通过程序指令相关的硬件来完成。前述的程序可以存储于一计算机可读取存储介质中。该程序在执行时，执行包括上述各方法实施例的步骤；而前述的存储介质包括：ROM、RAM、磁碟或者光盘等各种可以存储程序代码的介质。
最后应说明的是：以上各实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述各实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。

Claims (12)

  1. 一种双流发射方法，其特征在于，包括：
    发射机分别调制第一数据流和第二数据流，对所述第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道预先设置的发射波束的总数；
    所述发射机根据预先设置的符号与发射波束之间的对应关系，选择与所述第一数据流调制后的符号对应的发射波束；
    所述发射机采用以选择的发射波束代表所述第一数据流调制后的符号方式，通过所述选择的发射波束向接收机发射所述第一数据流调制后的符号，并采用以所述选择的发射波束承载第二数据流调制后的符号方式，通过所述选择的发射波束向所述接收机发射第二数据流调制后的符号；其中，所述选择的发射波束为与第一数据流调制后的符号对应的发射波束。
  2. 根据权利要求1所述的方法，其特征在于，在所述发射机分别调制第一数据流和第二数据流之前，还包括：
    所述发射机从所述单射频通道中的所有发射波束中选择出优选发射波束，对所述第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道的优选发射波束的总数，所述预先设置的符号与发射波束之间的对应关系为预先设置的符号与优选发射波束之间的对应关系。
  3. 根据权利要求2所述的方法，其特征在于，所述发射机从所述单射频通道中的所有发射波束中选择出优选发射波束，包括：
    所述发射机以不同的波束形式分别向所述接收机发送N个导频信号pi，所述接收机估计每个导频信号pi分别对应的信道Hi，其中，i∈1,…,N；所述N为所述单射频通道中的发射波束的总个数；
    所述发射机确定第1个优选发射波束发射的导频信号为
    Figure PCTCN2014086941-appb-100001
    其中，
    Figure PCTCN2014086941-appb-100002
    满足如下条件：
    Figure PCTCN2014086941-appb-100003
    其中，i∈1,…,N，Hi为估计得到的信道；
    所述发射机确定第m个优选发射波束发射导频信号
    Figure PCTCN2014086941-appb-100004
    其中，
    Figure PCTCN2014086941-appb-100005
    Hi'表示Hi的转置共轭，J代表已经被选中的发射波束所发射的导频信号对应的信道的序号，I代表 没有被选中的发射波束所发射的导频信号对应的信道的序号，α和β分别为加权系数，M为所述单射频通道中的优选发射波束的总个数。
  4. 根据权利要求1、2或3所述的方法，其特征在于，通过所述选择的发射波束发射第二数据流调制后的符号，包括：
    通过所述选择的发射波束，按照数据前面不加保护间隔的单载波方式发射第二数据流调制后的符号。
  5. 根据权利要求1、2或3所述的方法，其特征在于，通过所述选择的发射波束发射第二数据流调制后的符号，包括：
    通过所述选择的发射波束，按照单载波频域均衡方式发射第二数据流调制后的符号。
  6. 根据权利要求1、2或3所述的方法，其特征在于，通过所述选择的发射波束发射第二数据流调制后的符号，包括：
    通过所述选择的发射波束，按照多载波正交频分复用方式发射第二数据流调制后的符号。
  7. 一种发射机，其特征在于，包括：
    调制器，用于分别调制第一数据流和第二数据流，对所述第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道预先设置的发射波束的总数；
    处理器，用于根据预先设置的符号与发射波束之间的对应关系，选择与所述第一数据流调制后的符号对应的优选发射波束；
    发射器，用于采用以选择的发射波束代表所述第一数据流调制后的符号方式，通过所述选择的发射波束向接收机发射所述第一数据流调制后的符号，并采用以所述选择的发射波束承载第二数据流调制后的符号方式，通过所述选择的发射波束向所述接收机发射第二数据流调制后的符号；其中，所述选择的发射波束为与第一数据流调制后的符号对应的优选发射波束。
  8. 根据权利要求7所述的发射机，其特征在于：
    所述处理器，还用于从所述单射频通道中的所有发射波束中选择出优选发射波束，对所述第一数据流进行调制后生成的符号组成的集合中包括的符号的个数，等于所述发射机的单射频通道的优选发射波束的总数，所述预先设置的符号与发射波束之间的对应关系为预先设置的符号 与优选发射波束之间的对应关系。
  9. 根据权利要求8所述的发射机，其特征在于：
    所述发射器，还用于以不同的波束形式分别向所述接收机发送N个导频信号pi，所述接收机估计每个导频信号pi分别对应的信道Hi，其中，i∈1,…,N；所述N为所述单射频通道中的发射波束的总个数；
    所述处理器，还用于确定第1个优选发射波束发射的导频信号为
    Figure PCTCN2014086941-appb-100006
    其中，
    Figure PCTCN2014086941-appb-100007
    满足如下条件：
    Figure PCTCN2014086941-appb-100008
    其中，i∈1,…,N，Hi为估计得到的信道；
    所述处理器，还用于确定第m个优选发射波束发射导频信号
    Figure PCTCN2014086941-appb-100009
    其中，
    Figure PCTCN2014086941-appb-100010
    Hi'表示Hi的转置共轭，J代表已经被选中的发射波束所发射的导频信号对应的信道的序号，I代表没有被选中的发射波束所发射的导频信号对应的信道的序号，α和β分别为加权系数，M为为所述单射频通道中的优选发射波束的总个数。
  10. 根据权利要求7、8或9所述的发射机，其特征在于，所述发射器，还用于通过所述选择的发射波束，按照数据前面不加保护间隔的单载波方式发射第二数据流调制后的符号。
  11. 根据权利要求7、8或9所述的发射机，其特征在于，所述发射器，还用于通过所述选择的发射波束，按照单载波频域均衡方式发射第二数据流调制后的符号。
  12. 根据权利要求7、8或9所述的发射机，其特征在于，所述发射器，还用于通过所述选择的发射波束，按照多载波正交频分复用方式发射第二数据流调制后的符号。
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CN101814937A (zh) * 2009-02-19 2010-08-25 三星电子株式会社 同时支持多输入多输出和波束形成的装置和方法
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