WO2011088805A1

WO2011088805A1 - Multi-carrier multi-antenna signal transmission method and transmitter

Info

Publication number: WO2011088805A1
Application number: PCT/CN2011/070551
Authority: WO
Inventors: 黄晖
Original assignee: 华为技术有限公司
Priority date: 2010-01-25
Filing date: 2011-01-25
Publication date: 2011-07-28
Also published as: CN101778072B; CN101778072A

Abstract

The embodiments of the present invention provide a multi-carrier multi-antenna signal transmission method and a transmitter. The method includes that: the transmitter generates K carrier signals (11), wherein K is a natural number more than 1; and the transmitter transmits each of the K carrier signals via one group of transmitting antennas of K antenna groups (12). With the embodiment of present invention, the system performance can be improved when the signals which cannot adopt Space Time Coding (STC) technique or Beam Forming (BF) technique are transmitted.

Description

Multi-carrier multi-antenna signal transmission method and transmitter The present application claims to be Chinese patent issued on January 25, 2010, the application number is 201010115371.6, and the invention name is "multi-carrier multi-antenna signal transmission method and transmitter" Chinese patent The priority of the application, the entire contents of which are incorporated herein by reference. Technical field

Embodiments of the present invention relate to mobile communication technologies, and in particular, to a multi-carrier multi-antenna signal transmission method and a transmitter. Background technique

The combination of Multi-Input Multi-Output (MIMO) technology and Orthogonal Frequency Division Multiple (OFDM) technology can effectively improve the throughput and coverage performance of wireless communication systems. OFDM technology can well overcome the multipath effect of wireless channels and has high frequency efficiency. MIMO technology can increase the spectrum efficiency of wireless communication systems and improve system reliability. In a wireless system using MIMO technology and OFDM technology, most of the traffic channels for a single user can use the Space Time Coding (STC) technology or Beam Forming (BF) technology to obtain downlink multi-antenna power gain and diversity. Gain. The downlink signals in the wireless system include not only the above-mentioned traffic channels that can adopt STC technology or BF technology for a single user, but also signals that need to be sent to all users and traffic channels that cannot adopt STC technology or BF technology, for example, time division and complex In the (Time Division Duplex, TDD) frame structure mode, the downlink preamble (Preamble) and the downlink first zone (Zone) need to be sent to all users. In the prior art, there are also some signals that need to be sent to all users and traffic channels that cannot use STC technology or BF technology. In order to improve system performance, signals that need to be sent to all users and cannot use STC technology or BF technology. The traffic channel can use Cycle Delay Diversity (CDD) technology. Among them, the CDD technology transmits the same frequency on each transmitting antenna. The domain data is subjected to different cyclic delays for the OFDM symbols in the time domain to obtain the frequency diversity gain. The scheme of adopting CDD technology is roughly as follows: The signals of each carrier are respectively sent to all transmitting antennas, so that the signals of each carrier are simultaneously transmitted on all transmitting antennas, and the cyclic shift amount on each transmitting antenna increases sequentially. The more the total number of transmitting antennas, the larger the cyclic shift amount; after that, the signals of the respective carriers on each transmitting antenna are accumulated, and then transmitted through corresponding transmitting antennas, and each carrier equally divides the transmitting power of a single transmitting antenna. The inventors have found that at least the following problems exist in the prior art: In the scheme using the CDD technology, each carrier signal is transmitted through all the transmitting antennas, so that the cyclic delay difference on the transmitting antenna is large, and the frequency domain fluctuation speed is increased, and the frequency is increased. The accelerated fluctuation of the domain causes the demodulation performance of the receiving end to deteriorate, the coverage is reduced, and the signal-to-noise ratio at the receiving end is lowered. Summary of the invention

The embodiment of the invention provides a multi-carrier multi-antenna signal transmission method and a transmitter, which solves the problems of small coverage in the prior art and low signal-to-noise ratio at the receiving end.

An embodiment of the present invention provides a multi-carrier multi-antenna signal transmission method, including: a transmitter generates K carrier signals, where K is a natural number greater than 1;

The transmitter transmits each of the k-carrier signals through a set of transmit antennas of the K antenna packets.

An embodiment of the present invention provides a transmitter, including:

a generating module, configured to generate K carrier signals, where K is a natural number greater than 1; a sending module, configured to send each of the K carrier signals through a set of transmit antennas of the K antenna packets .

In the embodiment of the present invention, by transmitting the transmit antennas, each carrier signal is sent through a set of transmit antennas, and the transmit power can be concentrated on the partial antennas, thereby alleviating the problem that the signals transmitted by the respective transmit antennas at the receiving end cancel each other out. The coverage is increased and the signal-to-noise ratio at the receiving end is improved. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, a brief description of the drawings used in the description of the embodiments of the present invention will be briefly described. It is obvious that the drawings in the following description are some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in view of the drawings.

1 is a schematic flow chart of a method according to a first embodiment of the present invention;

2 is a schematic flow chart of a method according to a second embodiment of the present invention;

3 is a schematic diagram of an implementation principle of a transmitter used in an embodiment of the present invention;

4 is a schematic flow chart of a method according to a third embodiment of the present invention;

FIG. 5 is a schematic diagram of a process of transmitting a signal by using a CDD technology in each antenna group according to an embodiment of the present invention; FIG.

6 is a schematic flow chart of a method according to a fourth embodiment of the present invention;

7 is a schematic flowchart of using STC technology to transmit a signal by using CDD technology in each antenna group according to an embodiment of the present invention;

8 is a schematic flow chart of a method according to a fifth embodiment of the present invention;

FIG. 9 is a schematic flowchart of transmitting signals on all antennas by using STC technology and/or BF technology in an embodiment of the present invention; FIG.

FIG. 10 is a schematic structural diagram of a transmitter according to a sixth embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. 1 is a schematic flowchart of a method according to a first embodiment of the present invention, including: Step 11: A transmitter generates K carrier signals, where K is a natural number greater than 1; Step 12: The transmitter transmits the K carrier signals Each carrier signal is transmitted through one of the K antenna groups.

Optionally, at least one of the K antenna groups includes a number of transmit antennas greater than or equal to two.

Optionally, each of the K antenna groups may also include only one transmitting antenna.

Specifically, the method may be: dividing the N transmit antennas into K antenna groups, each carrier signal is sent by using one set of transmit antennas, and each set of transmit antennas sends one carrier signal, where N is the number of transmit antennas, where K is The number of carrier signals.

For example, N=4 transmit antennas are deployed on the transmitter, and the number of carrier signals that the transmitter can schedule is K=2, then 4 antennas are divided into 2 groups, each group including Ν/Κ=2 antennas. Thereafter, the first carrier signal can be transmitted on the first and second antennas, and the second carrier signal can be transmitted on the third and fourth antennas. In each of the following embodiments, Ν is used to indicate the number of transmitting antennas, and Κ is the number of carrier signals.

Since the carrier signal is transmitted simultaneously on all antennas, even with CDD technology, the demodulation performance at the receiving end may be poor, and the signals transmitted by the respective transmitting antennas may cancel each other, affecting the coverage and the signal-to-noise ratio at the receiving end. In order to solve the problem caused by transmission on all antennas, the embodiment of the present invention adopts an antenna grouping manner, so that each carrier signal is transmitted on a part of the transmitting antennas instead of all the transmitting antennas, and the receiving end can be mitigated when transmitting on some transmitting antennas. Possible problems in which the signals transmitted by the respective transmitting antennas cancel each other, improve the coverage, and enhance the signal and noise ratio of the receiving end.

In this embodiment, by dividing all the antennas into antenna groups having the same number of carrier signals, and the carrier signals are corresponding to the antenna packets, the working load of each transmitting antenna can be further balanced and the transmission power of each carrier signal can be improved. It can be understood that the antenna grouping of the embodiment of the present invention The number of the signals is not limited to the same number as the carrier signal, and may be different from the number of carrier signals. In this embodiment, when the number of transmit antennas in each group is greater than or equal to 2, CDD technology may be adopted in each antenna packet, that is, each antenna in each antenna packet transmits the same time domain. Cyclic delayed carrier signal. Since the number of antennas in each antenna group is smaller than the number of all transmitting antennas, the delay difference of the cyclic delay between the antennas becomes smaller, and therefore, the frequency domain change speed of the equivalent channel between the receiving end and the transmitting end becomes smaller. Slow, can improve the demodulation of the receiving end h

dagger.

In the above embodiment, the case where the transmitting antennas included in each antenna group are the same is taken as an example. In practical applications, the number of transmitting antennas included in each antenna group may also be different.

In this embodiment, by grouping the transmitting antennas, each carrier signal is transmitted through a group of transmitting antennas, and the transmitting power can be concentrated on a part of the antennas, thereby alleviating the problem that the signals transmitted by the respective transmitting antennas at the receiving end cancel each other out, and the coverage is realized. The increase of the range and the improvement of the signal-to-noise ratio at the receiving end; and further, when the CDD technology is adopted in each packet, since the number of antennas is reduced, the delay difference between the antennas can be reduced, the frequency domain change speed can be reduced, and the speed can be improved. The demodulation performance of the receiving end further improves the coverage and the signal-to-noise ratio at the receiving end. The above configuration may be adopted. For example, the first carrier signal is allocated to the first and second antennas, and the second carrier signal is allocated to the third and fourth antennas.

In order to improve the integration, the following antenna grouping methods can also be used:

2 is a schematic flowchart of a method according to a second embodiment of the present invention, including:

Step 21: The transmitter generates K carrier signals, where K is a natural number greater than 1; Step 22: The transmitter maps each of the K carrier signals to an N-channel transmission path signal.

The mapping may be specifically to copy one frequency domain data into the same N shares to obtain an N channel signal.

Step 23: The transmitter uses the following weighting coefficients for the N transmit path signals The weighting process is such that each carrier signal is transmitted through one of a plurality of transmit antennas.

Wherein, ^-1 , "^-1" is the weighting coefficient of the nth transmission path signal into which the i-th carrier signal is mapped, i=l,...K; η=1,...Ν, Ν is Κ Positive integer multiple.

Through the weighting process described above, although each carrier signal is mapped into a clan transmit path signal, after the weighting process, one transmit antenna is divided into two antenna groups, and each carrier is only in a corresponding set of transmit antennas. There is a signal on the signal, and the signal on the remaining transmit antennas is zero, thereby enabling each carrier signal to be transmitted on the corresponding antenna packet instead of being transmitted on all antennas.

Step 24: The transmitter performs an accumulating process on each of the transmit channel signals corresponding to the weighted processed carrier signals, and transmits the accumulated nth transmit channel signals using the nth antenna.

The accumulating process and the corresponding sending can be implemented by using the prior art, and details are not described herein again.

In this embodiment, when the number of transmit antennas in each group is greater than or equal to 2, CDD technology may be separately used in each antenna packet, that is, each antenna in each antenna packet transmits the same carrier. The frequency domain data, while the time domain data is cyclically delayed. Since the number of antennas in each antenna group is 1/K of the number of all transmitting antennas, the number of antennas is reduced, and the delay difference of the cyclic delay between the antennas becomes small, so the equivalent between the receiving end and the transmitting end The frequency domain of the channel changes slowly, which can improve the demodulation performance of the receiving end, improve the coverage and the signal-to-noise ratio of the receiving end.

In the foregoing embodiment, the case where the number of the transmitting antennas is a positive integer multiple of the number of carrier signals, and the transmitting antennas included in each antenna group are the same is taken as an example. In practical applications, other weighting algorithms may also be used. The number of transmit antennas included in each antenna packet is different, and the number of transmit antennas is not limited to only a positive integer multiple of the number of carrier signals.

In this embodiment, by weighting the carrier signal, each carrier signal can be made in pairs. The antenna group is transmitted on the antenna, and the transmission power is concentrated on some antennas, the transmission power of each carrier signal is increased, the coverage is expanded, and the signal-to-noise ratio of the receiver is improved.

In a wireless system using OFDM technology, the downlink signal can be divided into two parts according to whether it can adopt STC technology or BF technology. For example, it can be divided into a first part and a second part. The first part is a signal that cannot adopt STC technology or BF technology. The second part is the signal that can use STC technology or BF technology. The first part can be transmitted by the above antenna grouping method. The second part can adopt STC technology or BF technology. Therefore, STC technology or BF technology can still be used for the second part. Of course, the second part can also adopt the above-mentioned The antenna grouping method, or the combination of the antenna grouping method described above and the STC technology. For details, see the following examples.

3 is a schematic diagram of an implementation principle of a transmitter used in an embodiment of the present invention. Referring to FIG. 3, the frequency domain data of the first carrier signal to the Kth carrier signal (ie, carrier 0 to carrier K-1) is processed. The frequency domain data of each carrier signal is combined and transmitted through the first antenna to the Nth antenna (ie, antenna 0 to antenna N). The specific processing flow of the frequency domain data of each carrier signal can be referred to the following embodiment.

4 is a schematic flowchart of a method according to a third embodiment of the present invention, including:

Step 41: The transmitter generates K carrier signals, where K is a natural number greater than 1; Step 42: The transmitter determines whether the K carrier signals belong to the first part or belong to the second part, where the first part is not applicable The signal of STC technology or BF technology, the second part is a signal capable of using STC technology or BF technology.

For example, taking the TDD frame structure of the OFDM system as an example, the first part may be downlink preamble data (Preamble) and downlink first area (Zone) data. The preamble data is a pseudo-random sequence determined by a segment number and a cell identifier (IDCELL) given by the protocol, and is used for terminal (Mobile Station, MS) for timing synchronization, system parameter extraction, signal quality measurement, and channel estimation. The first downlink is used to send broadcast messages such as FCH and service data that cannot use STC technology or BF technology. The second part can be business data that can adopt STC technology or BF technology.

Therefore, according to the above signal type, for example, when the K carrier signals are preamble data, the K carrier signals are obtained to belong to the first part. Alternatively, when the K carrier signals are traffic channels capable of adopting STC technology or BF technology, the K carrier signals are obtained to belong to the second part.

When the first part is transmitted by the antenna grouping method and the second part is not transmitted by the antenna grouping method, the weighting coefficients corresponding to the first part and the second part are different due to different transmission modes, and therefore, the first part of each carrier signal is required. The time boundary points of the downlink frame resources corresponding to the second part are the same. The time boundary point of the downlink frame resource corresponding to the first part and the second part may be determined in advance, for example, a specific demarcation point value is pre-configured; and the downlink frame resource used by the terminal may be dynamically adjusted, so that the first part of each carrier signal is The downlink frame resources corresponding to the second part are the same. For example, the base station (BS) counts the throughput of the MS corresponding to each part of each carrier signal (ie, the first part and the second part), and ensures each by load control. The load between the parts of the carrier is basically the same. By adjusting the downlink frame resources of the first part or the second part of the MS, the time boundary points of the downlink frame resources corresponding to the first part and the second part of each carrier signal are the same.

Step 43: When the K carrier signals belong to the first part, the transmitter sends the K carrier signals belonging to the first part by using an antenna grouping.

Specifically, referring to FIG. 3, for the K carrier signals belonging to the first portion, the frequency domain data of the carrier 0 to the carrier K-1 of the first portion is input. This can be done using steps 22-24.

In this embodiment, in order to further improve system performance, CDD technology can be further adopted in each antenna group.

FIG. 5 is a schematic diagram of a process of transmitting a signal by using CDD technology in each antenna group according to an embodiment of the present invention. Step 43 in this embodiment may be specifically referred to FIG. 5, including:

Step 51: Corresponding to the frequency domain data of each carrier signal, the multi-antenna processing module performs mapping processing, and maps the input one-channel frequency domain data into N-channel frequency domain data. Step 52: Perform inverse Fast Fourier Transform (IFFT) processing corresponding to each frequency domain data, and convert N frequency domain data into N time domain data.

Step 53: Perform weighting processing corresponding to each time domain data, wherein the weighting coefficients of each channel are:

1

Where ^-1 , "^-1" is the weighting coefficient of the nth carrier data into which the i-th carrier signal is mapped, i=l,...K; n=l,...N, N is a positive integer of K Times.

Specifically, the weighting coefficients of the time domain data corresponding to the first carrier (carrier 0) are:

«-1-0,...,— -1

1 κ

W =

r ^v 0,nl 0 η-\ =—,...,Ν-\

υ Κ

The weighting coefficients of the time domain data corresponding to the second carrier (carrier 1) are:

Similarly, the weighting coefficients of the time domain data corresponding to the second carrier (carrier K-l) are:

After the above weighting process, the first carrier signal will be in the first antenna group (by antenna ^-1

0~ antenna is composed), the second carrier signal will be grouped in the second antenna (by antenna N 2Ν ₁

~ Ύ - ) on the transmission, ..., the κth carrier signal will be grouped in the κ antenna (by day (Κ - ϊ) χ Ν

The line ^ Κ ^ ~ antenna N - i ) is transmitted, and different carrier signals are transmitted on different antenna groups, and each group of antenna packets transmits only one carrier signal.

Further, in order to improve system performance, CDD processing may be further performed in each antenna group, that is, may further include:

Step 54: Perform cycle delay processing corresponding to the time domain data after each weighting process. d" ^-1 represents the cyclic delay of the i-th carrier signal on the nth road, i=l,...K; n=l,...N. Wherein, the cyclic delay value corresponding to each antenna ^Τ "'"It can be obtained using the determination method in the existing CDD technology.

After the CDD processing, it may further include:

Step 55: Correspond to each channel of data, add cyclic prefix (CP) force port window processing.

Step 56: Perform frequency shift processing corresponding to each channel of data, and modulate each carrier signal to a corresponding carrier frequency.

Step 57: After combining the respective carrier signals, send them through N antennas.

Steps 55-57 can be implemented by using existing technologies, and are not described again.

Through the foregoing processing, different antenna signals are transmitted by using different antenna groups for the first part, and the transmission power of each carrier signal can be improved compared with the scheme in which each carrier signal is transmitted on all antennas in the prior art. Increase the coverage and improve the signal-to-noise ratio at the receiving end. Further, by adopting CDD technology in each packet, the delay difference of the antenna can be reduced, the frequency domain change speed of the equivalent channel between the transmitting end and the receiving end can be reduced, and the demodulation performance of the receiving end can be improved.

Step 44: When the K carrier signals belong to the second part, the transmitter transmits the K carrier signals belonging to the second part by using an antenna grouping.

The specific processing flow is similar to the processing procedure of the carrier signal belonging to the first part, except that the input is the carrier signal belonging to the second part, and the steps shown in FIG. 5 may be omitted. Said.

It can be understood that, since the carrier signals belonging to the first part and the second part are all transmitted by using the antenna grouping manner in this embodiment, the determination that the carrier signal belongs to the first part and the second part may not be performed, but directly The generated carrier signal is transmitted by antenna grouping.

In this embodiment, by grouping the transmitting antennas, the transmission power of each carrier signal can be improved, the coverage of the transmitter can be expanded, and the signal-to-noise ratio of the receiving end can be improved. By performing CDD processing in each antenna group, the CDD can be reduced. The number of antennas of the technology reduces the frequency domain change speed of the equivalent channel and improves the demodulation performance of the receiving end.

FIG. 6 is a schematic flowchart of a method according to a fourth embodiment of the present invention, including:

Steps 61 - 63: Corresponding to steps 41 -43.

Step 64: When the K carrier signals belong to the second part, the transmitter uses the antenna grouping method and the STC technology to transmit the K carrier signals belonging to the second part.

It should be noted that there is no order in which the transmitter transmits the carrier signal belonging to the first part and the carrier signal belonging to the second part.

Since the second part has STC capabilities, STC technology can be used. Of course, in order to further improve system performance, CDD technology can be further used in each antenna group.

FIG. 7 is a schematic flowchart of using STC technology to transmit signals by using CDD technology in each antenna group according to an embodiment of the present invention. Step 64 in this embodiment may be specifically referred to FIG. 7, and includes:

Step 71: Corresponding to the frequency domain data of each carrier signal, the multi-antenna processing module first performs STC processing, and then performs mapping processing on the frequency domain data after the STC processing, and maps the two frequency domain data obtained by the STC processing into N paths. Frequency domain data.

The two channels of frequency domain data are obtained after the STC process, and the mapping may be specifically to copy each frequency domain data processed by the STC into the same N/2 channel, and finally form N-channel frequency domain data.

Steps 72-77: Similar to steps 52-57.

In this embodiment, by transmitting the transmit antennas, the transmit power of each carrier signal can be improved. Rate, expand the coverage of the transmitter, improve the signal-to-noise ratio at the receiving end; By performing CDD processing in each antenna group, the number of antennas using CDD technology can be reduced, the frequency domain change speed of the equivalent channel can be reduced, and the solution at the receiving end can be improved. Tuning performance; In this embodiment, by performing STC processing, the advantages of the STC technology can be fully utilized to further improve system performance.

In the above embodiment, the signals are transmitted by means of antenna grouping. Since the second part can use STC technology or BF technology, and the STC technology or the BF technology has good performance, the second part may not be performed. The antenna grouping uses at least one of STC technology and BF technology, and each carrier signal is transmitted on all antennas.

FIG. 8 is a schematic flowchart of a method according to a fifth embodiment of the present invention, including:

Steps 81 - 83: Similar to steps 41 -43.

Step 84: When the K carrier signals belong to the second part, the transmitter adopts STC technology, BF technology or STC and BF technology (STC technology and/or BF technology), and each carrier signal of the K carrier signals Sent on all N antennas.

It should be noted that the time when the transmitter transmits the carrier signal belonging to the first part and the carrier signal belonging to the second part is not in the order, which may also be performed simultaneously.

FIG. 9 is a schematic flow chart of transmitting signals on all antennas by using STC technology and/or BF technology in an embodiment of the present invention. Step 84 in this embodiment may be specifically referred to FIG. 9, including:

Step 91: corresponding to the frequency domain data of each carrier signal, the multi-antenna processing module first performs STC processing or BF processing, or performs STC and BF processing (STC and/or BF processing), and then processes the STC and/or BF. The frequency domain data is mapped to obtain N frequency domain data.

Among them, mapping refers to copying a piece of data into the same multiple copies, so that the output is N way. Step 92: Perform IFFT processing corresponding to each frequency domain data, and convert N frequency domain data into N time domain data.

Step 93: Perform weighting processing corresponding to each time domain data, where the weighting system of each channel

Since each antenna needs to transmit all carrier signals, each carrier signal needs to be equally divided into the transmission power of each antenna. Therefore, the above weighting values need to be processed to ensure that the total transmission power of each antenna does not change.

Further, in order to improve system performance, CDD processing may be further performed, that is, it may further include:

Step 94: Perform cycle delay processing corresponding to the time domain data after each weighting process.

Indicates the cyclic delay of the i-th carrier signal on the nth road, i=l,...K; n=l,...N. Specifically, when the multi-antenna processing module adopts the STC and BF technologies, or the BF technology, since the BF technology itself is a weighting operation for each antenna, the BF technology does not need to further adopt the CDD technology, and therefore, The loop delay value can be set to 0. When the multi-antenna processing module uses the STC technology, the loop delay value ⁷ corresponding to each antenna can be obtained by using the determination method in the existing CDD technology.

Steps 95-97: Corresponding to steps 55-57.

In this embodiment, the first part is transmitted by using an antenna grouping, and the second part is sent by using STC technology and/or BF technology on all antennas, and the performance of the common area can be ensured, and the antenna gain or diversity gain of the multi-antenna system is fully utilized. The advantages.

10 is a schematic structural diagram of a transmitter according to a sixth embodiment of the present invention, including a generating module 101 and a transmitting module 102. The generating module 101 is configured to generate K carrier signals, where K is a natural number greater than 1, and the sending module 102 is configured to Each of the K carrier signals is transmitted through a set of transmit antennas of the K antenna packets.

Specifically, the sending module 102 may include a mapping unit 1021, a weighting unit 1022, and a sending unit 1023. The mapping unit 1021 is configured to map each carrier signal to an N-channel transmitting channel. The road signal, the N is the total number of transmit antennas; the weighting unit 1022 is configured to perform weighting processing on the N transmit path signals by using the following weighting coefficients:

Wherein, the weighting coefficient of the nth transmission path signal mapped to the i-th carrier signal, i=l" ..K, n=l,...N;

The transmitting unit 1023 is configured to perform accumulative processing on each of the transmit channel signals corresponding to the weighted all carrier signals, and transmit the accumulated nth transmit path signals using the nth transmit antenna.

In order to further improve system performance, CDD technology may be further adopted in each antenna group, that is, when N/K is greater than or equal to 2, the transmitting unit 1023 includes a first subunit and a second subunit; And performing a CDD process on the transmit path signals corresponding to each carrier signal after the weighting process; the second sub-unit is configured to perform accumulative processing on each of the transmit path signals corresponding to all the carrier signals processed by the CDD, and The accumulated nth transmit path signal is transmitted using the nth transmit antenna.

In addition, the K carrier signals may be signals that cannot use STC technology or BF technology, or may be signals using STC technology or BF technology.

When the K carrier signals are signals capable of using the STC technology, the sending module 102 may include a first unit and a second unit, where the first unit is configured to perform each of the K carrier signals. The second unit is configured to send each of the carrier signals processed by the STC processing by one of the K antenna groups, where the second unit may further include the mapping unit, the weighting unit, and the sending. unit.

In this embodiment, by weighting the carrier signal, each carrier signal can be transmitted on the corresponding antenna packet, increasing the transmission power of each carrier signal, expanding the coverage, and improving the signal-to-noise ratio of the receiving end; CDD technology can be used internally to reduce the antenna The delay difference reduces the frequency domain change speed of the equivalent channel between the transmitting end and the receiving end, and improves the demodulation performance of the receiving end.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail 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 are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A multi-carrier multi-antenna signal transmitting method, comprising: a transmitter generating K carrier signals, wherein the K is a natural number greater than 1;

The transmitter transmits each of the K carrier signals through a set of transmit antennas of the K antenna packets.

2. The method according to claim 1, wherein at least one of the K antenna packets comprises a number of transmit antennas greater than or equal to two.

3. The method according to claim 1, wherein the K carrier signals are signals that cannot use STC technology or BF technology, or can use space time coding STC technology or beamforming BF technology. signal.

The method according to claim 3, wherein when the K carrier signals are signals capable of adopting the STC technology, the carrier signals of the K carrier signals are transmitted through K antennas. A set of transmit antenna transmissions in a packet includes:

STC processing is performed on each of the K carrier signals; and each of the STC processed carrier signals is transmitted through one of the K antenna groups.

The method according to any one of claims 1-4, wherein the transmitting, by each of the K carrier signals, a set of transmit antennas of the K antenna packets comprises:

Mapping each carrier signal to an N-channel transmission path signal, where N is the total number of transmitting antennas;

The N-channel transmit path signals are weighted by the following weighting coefficients:

- 1

Wherein - ¹ - ¹ is a weighting coefficient of the nth transmission path signal to which the i th carrier signal is mapped, i = l" .. K, n = l, ... N; The transmission path signals corresponding to all the carrier signals after the weighting process are separately subjected to accumulation processing according to each channel, and the accumulated nth channel transmission channel signals are transmitted using the nth transmitting antenna.

The method according to claim 5, wherein when the N/K is greater than or equal to 2, the accumulating processing of the transmission path signals corresponding to all the carrier signals after the weighting processing according to each channel comprises:

Performing cyclic delay diversity CDD processing on the transmission path signals corresponding to each carrier signal after the weighting process;

The transmission path signals corresponding to all carrier signals processed by the CDD are separately subjected to accumulation processing according to each channel, and the accumulated nth transmission path signals are transmitted using the nth transmitting antenna.

7. A transmitter, comprising:

The transmitter according to claim 7, wherein when the K carrier signals are signals capable of adopting STC technology, the sending module includes:

a first unit, configured to perform space time coding STC processing on each of the K carrier signals;

The second unit is configured to send each of the STC processed carrier signals through a set of transmit antennas of the K antenna groups.

The transmitter according to claim 7, wherein the sending module comprises: a mapping unit, configured to map each carrier signal into an N-channel transmit path signal,

N is the total number of transmitting antennas;

The weighting unit is configured to perform weighting processing on the N channels of the transmission path by using the following weighting coefficients:

Where - -i is the weighting coefficient of the _nth transmit path signal to which the i th carrier signal is mapped, i = l" .. K, n = l, ... N;

And a sending unit, configured to perform accumulative processing on each of the transmit channel signals corresponding to the weighted processed carrier signals, and send the accumulated nth transmit path signals by using the nth transmit antenna.

The transmitter according to claim 9, wherein when the N/K is greater than or equal to 2, the sending unit comprises:

a first sub-unit, configured to perform cyclic delay diversity CDD processing on the transmit path signals corresponding to each carrier signal after the weighting process;

The second sub-unit is configured to perform accumulative processing on each of the transmit channel signals corresponding to all the carrier signals processed by the CDD, and use the nth transmit antenna to transmit the accumulated nth transmit path signals.