CN107294690B - Modulation symbol transmission method and sending equipment - Google Patents
Modulation symbol transmission method and sending equipment Download PDFInfo
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- CN107294690B CN107294690B CN201610225408.8A CN201610225408A CN107294690B CN 107294690 B CN107294690 B CN 107294690B CN 201610225408 A CN201610225408 A CN 201610225408A CN 107294690 B CN107294690 B CN 107294690B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0011—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to payload information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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Abstract
A modulation symbol transmission method and a sending device are used for reducing the error probability of a bit sequence to be sent of the sending device, which is obtained by a receiving device through modulation symbol detection, and improving the communication performance of a system. The method comprises the following steps: the method comprises the steps that a sending device modulates a bit sequence to be sent into M modulation symbols according to a set modulation mode, wherein M is an integer larger than 1; the sending equipment determines M resource units, maps M modulation symbols to the M resource units one to one, and sends the M modulation symbols to the receiving equipment.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a modulation symbol transmission method and a transmission apparatus.
Background
In the existing wireless communication technology, as shown in fig. 1, a transmitting device generally modulates a bit sequence to be transmitted into a modulation symbol, and maps the modulation symbol onto a resource unit for transmission to a receiving device. However, the modulation symbol transmitted by the transmitting device is easily affected by multiple factors such as path loss of a wireless channel, shadowing effect, multipath fading, etc., so that the signal-to-interference-and-noise ratio of the modulation symbol received by the receiving device on a single resource unit is low, which results in high error probability of the bit sequence obtained by the receiving device through the detection of the modulation symbol, and seriously affects the reliability of communication.
In order to reduce the error probability of detecting a bit sequence by a receiving device and improve the reliability of communication, an existing wireless communication system may use a spread spectrum technique for communication, as shown in fig. 2, a transmitting device modulates a bit sequence to be transmitted into a modulation symbol, multiplies the modulation symbol by different real numbers, and then maps the obtained different products onto a plurality of resource units respectively for transmission to the receiving device.
In the scheme for performing communication according to the spread spectrum technique, since the signal transmitted on each resource unit is the product of the same modulation symbol and a real number, the transmission performance of the scheme is equivalent to that the same modulation symbol is transmitted on all resource units. The modulation symbol carries information of each bit in the bit sequence to be transmitted, and the reliability difference of the information of different bits carried in the modulation symbol is large, so that the detection performance of the receiving equipment is influenced by the bit information with the lowest reliability. Therefore, in the scheme of communication according to the spread spectrum technique, the average error probability of the bit sequence to be transmitted of the transmitting device, which is obtained by the receiving device through modulation symbol detection, is still large.
Disclosure of Invention
The embodiment of the invention provides a modulation symbol transmission method and a transmitting device, which are used for reducing the error probability of a bit sequence to be transmitted of the transmitting device, which is obtained by a receiving device through modulation symbol detection, and improving the communication performance of a system.
In a first aspect, a method for transmitting a modulation symbol provided in an embodiment of the present invention includes:
the method comprises the steps that a sending device modulates a bit sequence to be sent into M modulation symbols according to a set modulation mode, wherein M is an integer larger than 1;
the sending equipment determines M resource units, maps the M modulation symbols to the M resource units in a one-to-one mode, and sends the M modulation symbols to the receiving equipment.
The modulation scheme is a modulation scheme used when modulating a bit sequence based on an adopted modulation technique, and the modulation scheme can modulate the bit sequence to be transmitted into a signal with amplitude and phase, the signal is represented by a complex number, and the complex number is called a modulation symbol. The bit sequence to be transmitted refers to a sequence formed by arranging a plurality of bits according to a certain sequence, and the number of bits contained in the bit sequence to be transmitted is equal to the modulation order of the set modulation mode.
In this way, the transmitting device modulates the bit sequence to be transmitted into a plurality of modulation symbols, so that the transmitting device averages the reliability of the bit information carried by the modulation symbols transmitted to the receiving device, improves the reliability difference between different bit information carried by the modulation symbols, further reduces the error probability of the bit sequence to be transmitted of the transmitting device obtained by the receiving device through the detection of the modulation symbols, and improves the communication performance of the system.
In a possible implementation manner, the method for modulating, by the sending device, a bit sequence to be sent into M modulation symbols according to a set modulation scheme includes:
the sending equipment rearranges the bit positions in the bit sequence to be sent according to the arrangement sequence of the M bit positions respectively to obtain M bit sequences to be modulated;
and the sending equipment modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively according to the set modulation mode to obtain the M modulation symbols.
Therefore, the transmitting equipment obtains a plurality of bit sequences to be modulated by reordering the bit sequences to be transmitted, and then the plurality of bit sequences to be modulated can obtain a plurality of modulation symbols by modulating, so that the transmitting equipment averages the reliability of bit information carried by the modulation symbols transmitted to the receiving equipment, and the reliability difference between different bit information carried by the modulation symbols is improved.
In a possible implementation manner, before the sending device modulates each bit sequence to be modulated in the M bit sequences to be modulated, the method further includes:
the sending equipment selects a set number of bit sequences to be modulated from the M bit sequences to be modulated; the set number is less than or equal to M;
and for each bit sequence to be modulated in the set number of bit sequences to be modulated, the sending equipment performs an inversion operation on bits at set positions in each bit sequence to be modulated.
Therefore, the reliability averaging of bit information carried by the modulation symbols transmitted to the receiving equipment is further realized, and the reliability difference between different bit information carried by the modulation symbols is improved.
In a possible implementation manner, the method for obtaining the M modulation symbols by the sending device to modulate each bit sequence to be modulated in the M bit sequences to be modulated respectively includes:
the sending equipment respectively maps each bit sequence to be modulated to obtain a modulation symbol according to each bit sequence to be modulated and the mapping relation between the bit sequence and the modulation symbol;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes the bit sequence to be modulated, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to one modulation symbol, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
Therefore, the sending equipment realizes the modulation of the bit sequence to be modulated to obtain the corresponding modulation symbol by searching the mapping relation between the bit sequence and the modulation symbol.
In one possible implementation, the method for modulating, by the transmitting device, a bit sequence to be transmitted into M modulation symbols includes:
the sending equipment maps the bit sequence to be sent to obtain M modulation symbols according to the bit sequence to be sent and the mapping relation between the bit sequence and the modulation symbols;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes the bit sequence to be transmitted, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to M modulation symbols, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
Therefore, the transmitting equipment can realize that the bit sequence to be transmitted is modulated to obtain a plurality of corresponding modulation symbols by searching the mapping relation between the bit sequence and the modulation symbols.
In a possible implementation manner, the set modulation manner includes at least two modulation manners of one modulation manner or a plurality of modulation manners having the same modulation order.
In a second aspect, a modulation symbol transmission method provided in an embodiment of the present invention includes:
receiving, by a receiving device, M modulation symbols sent by a sending device mapped on M resource units, where M is an integer greater than 1, and the M modulation symbols are obtained by the sending device modulating a bit sequence to be sent according to a set modulation mode;
and the receiving equipment determines the detection information of the bit sequence to be sent of the sending equipment according to the M modulation symbols.
Therefore, the transmitting equipment modulates the bit sequence to be transmitted into a plurality of modulation symbols, so that the transmitting equipment averages the reliability of bit information carried by the modulation symbols transmitted to the receiving equipment, the reliability difference between different bit information carried by the modulation symbols is improved, the error probability of the bit sequence to be transmitted of the transmitting equipment, which is obtained by the receiving equipment through modulation symbol detection, is reduced, and the communication performance of the system is improved.
In a possible implementation manner, the detection information of the bit sequence to be transmitted of the transmission device includes a hard decision result of the bit sequence to be transmitted and/or soft information of the bit sequence to be transmitted.
In a third aspect, an embodiment of the present invention provides a sending device, where the sending device has a function of implementing a behavior of the sending device in the foregoing method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In an alternative implementation, the structure of the sending device includes a processor and a transmitter, where the processor is configured to support the sending device to execute the corresponding functions in the above method; the transmitter is used for transmitting data or messages related in the method; the transmitting device may further include a memory, coupled to the processor, that retains program instructions and data necessary for the transmitting device; the transmitting device may further include a receiver for receiving messages or data.
In a fourth aspect, an embodiment of the present invention provides a receiving device, where the receiving device has a function of implementing a behavior of the receiving device in the foregoing method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In an alternative implementation, the receiving device comprises a receiver and a processor, wherein the receiver is used for receiving the data or the message involved in the method; the processor is configured to support the receiving device to execute the corresponding functions of the method; the receiving device may further include a memory, coupled to the processor, that retains program instructions and data necessary for the receiving device; the receiving device may further comprise a transmitter for transmitting messages or data.
In a fifth aspect, an embodiment of the present invention provides a wireless communication system, where the wireless communication system includes the transmitting device and the receiving device described in any one of the first aspect to the fourth aspect.
In a sixth aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for a sending device according to any one of the first to fifth aspects, which contains a program designed to execute the above aspects.
In a seventh aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for a receiving device according to any one of the first to fifth aspects, which contains a program designed for executing the above aspects.
In an eighth aspect, an embodiment of the present invention provides a chip, configured to execute the method performed by the sending apparatus according to any one of the first aspect to the fifth aspect.
In a ninth aspect, an embodiment of the present invention provides a chip, configured to perform the method performed by the receiving apparatus according to any one of the first to fifth aspects.
In the technical solution provided by the embodiment of the present invention, a transmitting device modulates a bit sequence to be transmitted into a plurality of modulation symbols, and transmits the plurality of modulation symbols to a receiving device through a plurality of resource units. According to the scheme, the sending equipment modulates the bit sequence to be sent into a plurality of modulation symbols, so that the sending equipment averages the reliability of bit information carried by the transmitted modulation symbols, the reliability difference between different bit information carried by the modulation symbols is improved, the error probability of the bit sequence to be sent of the sending equipment, which is obtained by the receiving equipment through the detection of the modulation symbols, is reduced, and the communication performance of the system is improved.
Drawings
Fig. 1 is a schematic diagram of a modulation symbol transmission method provided in the prior art;
fig. 2 is a schematic diagram of a modulation symbol transmission method provided in the prior art;
fig. 3 is a schematic flow chart of a modulation symbol transmission method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of modulation symbol and resource unit mapping according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating a modulation symbol transmission method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a sending device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a sending device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a modulation symbol transmission method and a sending device, wherein the sending device modulates a bit sequence to be sent into a plurality of modulation symbols and transmits the modulation symbols to a receiving device through a plurality of resource units. According to the scheme, the sending equipment modulates the bit sequence to be sent into a plurality of modulation symbols, so that the sending equipment averages the reliability of bit information carried by the transmitted modulation symbols, the reliability difference between different bit information carried by the modulation symbols is improved, the error probability of the bit sequence to be sent of the sending equipment, which is obtained by the receiving equipment through the detection of the modulation symbols, is reduced, and the communication performance of the system is improved. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.
The technical scheme provided by the embodiment of the invention can be applied to a wireless communication system and is suitable for a scene that the sending equipment sends information to the receiving equipment. Taking a Long Term Evolution (LTE) system as an example, for uplink transmission, the sending device may be a terminal device, and the receiving device may be a base station; for downlink transmission, the sending device may be a base station, and the receiving device may be a terminal device.
The communication system of the wireless communication system applied in the embodiment of the present invention includes but is not limited to: GSM (Global System of Mobile communication), CDMA (Code Division Multiple Access) IS-95, CDMA (Code Division Multiple Access) 2000, Time Division Synchronous Code Division Multiple Access (TD-SCDMA), WCDMA (Wideband Code Division Multiple Access, WCDMA), TDD (Time Division Duplex-Long Term Evolution, TDD LTE), WiMAX-Long Term Evolution (FDD), LTE-Long Term Evolution (Wireless Evolution-Long Term Evolution), WiFi-Handheld telephone (Personal Mobile Internet protocol), WiFi-Handheld telephone (Wireless Internet protocol 802), WiFi-Wireless broadband (Wireless Internet protocol for Internet 11), and various wireless communication systems that evolve in the future.
The terminal device may be a wireless terminal, which may be a device that provides voice and/or data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (e.g., RAN). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A wireless Terminal may also be referred to as a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User agent (User agent), a User Device (User Device), or a User Equipment (User Equipment).
For a GSM system, a Base Station may include a Base Transceiver Station (BTS) and/or a Base Station Controller (BSC); for TD-SCDMA systems, WCDMA systems, the base station may include a node B (NodeB, NB) and/or a Radio Network Controller (RNC), and for LTE systems, the base station may be an eNB.
A modulation symbol transmission method provided in an embodiment of the present invention is described in detail below.
As shown in fig. 3, at a sending device, an embodiment of the present invention provides a modulation symbol transmission method, including:
s301, modulating a bit sequence to be transmitted into M modulation symbols by a transmitting device according to a set modulation mode, wherein M is an integer greater than 1;
s302, the sending equipment determines M resource units, one-to-one maps M modulation symbols to the M resource units, and sends the M modulation symbols to the receiving equipment.
In this embodiment of the present invention, the set modulation scheme may include one modulation scheme or at least two modulation schemes of multiple modulation schemes with the same modulation order, where the modulation order of the modulation scheme is equal to the number of bits included in the bit sequence modulated by the modulation scheme. The Modulation scheme is a Modulation scheme used for modulating a bit sequence based on the Modulation technique used, that is, a scheme for mapping one bit sequence to a Modulation symbol, and the Modulation technique used is, for example, 16 Quadrature Amplitude Modulation (QAM) or 64 QAM. The bit sequence to be sent is a sequence formed by arranging a plurality of bits according to a certain sequence, and the number of bits contained in the bit sequence to be sent is equal to the modulation order of the set modulation mode; illustratively, the bit sequence to be transmitted may take { b }1，b2，...，bLIn the form of }, L represents the length of the bit sequence to be transmitted, i.e., the number of bits included in the bit sequence to be transmitted, and L is equal to the modulation order of the set modulation scheme adopted by the transmission device, taking the 16QAM modulation scheme as an example, the modulation order of the 16QAM modulation scheme is 4, and at this time, the number of bits included in the bit sequence to be transmitted is 4. The bit sequence to be transmitted can be modulated by means of a modulation scheme into a signal having an amplitude and a phase, which signal is represented by a complex number, which is referred to as a modulation symbol.
The resource units in the embodiments of the present invention may be time-frequency resource units, but with the development of technology, the resource units in the embodiments of the present invention are not limited to time-frequency resource units. In the field of wireless communications, transmission resources may be distributed over multiple dimensions, such as time domain, frequency domain, code domain, and so on. Taking LTE system as an example, in the time domain, the largest time unit is a radio frame with a length of 10 ms, the radio frame can be divided into 10 subframes with a length of 1 ms, each subframe can be divided into two slots with a length of 0.5 ms, and each slot contains 6 or 7 Orthogonal Frequency Division Multiplexing (OFDM) symbols. In the frequency domain, the system partitions the available frequency resources into several subcarriers, each occupying 15000 hz bandwidth in the frequency domain. In the LTE system, the minimum unit of a resource is composed of the duration of 1 OFDM symbol in the time domain and the bandwidth occupied by 1 subcarrier in the frequency domain, and is called a time-frequency resource unit.
In the embodiment of the present invention, S301 may be implemented by the following three schemes.
The first scheme comprises the following steps:
the method comprises the following steps: the sending equipment rearranges the bit positions in the bit sequence to be sent according to the M bit position arrangement sequences respectively to obtain M bit sequences to be modulated.
Wherein, the bit position arrangement sequence can be either qualitative or random.
Step two: the method comprises the steps that a sending device selects a set number of bit sequences to be modulated from M bit sequences to be modulated; and for each bit sequence to be modulated in the bit sequence to be modulated with the set number, the transmitting equipment performs an inversion operation on bits at set positions in each bit sequence to be modulated.
Wherein the set number is less than or equal to M; for different bit sequences to be modulated, the number of bits respectively subjected to the inversion operation may be the same or different, and the bit positions respectively subjected to the inversion operation may be the same or different.
Step three: and the sending equipment modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively according to the set modulation mode to obtain M modulation symbols.
The modulation method for modulating the M bit sequences to be modulated may be one modulation method or at least two modulation methods among multiple modulation methods with the same modulation order, and when at least two modulation methods among the multiple modulation methods are adopted, the types of the adopted modulation methods are less than or equal to M.
Illustrate scheme one
Suppose that the set modulation mode is 16QAM, the modulation order of 16QAM is 4, and the bit sequence to be transmitted is { b }1，b2，b3，b4}. In the first step, according to the arrangement sequence of M-2 bit positions,to { b1，b2，b3，b4Rearranging the bit positions in the sequence to obtain 2 bit sequences to be modulated, wherein the bit sequences are { b }3，b1，b4，b2And { b }and1，b3，b2，b4}. Selecting a second bit sequence b to be modulated in the second step1，b3，b2，b4The second bit b in3And a fourth bit b4Performing negation operation to obtain a bit sequence to be modulated
In the third step, 16QAM is adopted to treat the modulated bit sequences { b }respectively3，b1，b4，b2And
modulating to obtain 2 modulation symbols S1And S2。
Optionally, in step three, the sending device may map each bit sequence to be modulated to obtain one modulation symbol by looking up a mapping relationship between the bit sequence and the modulation symbol, that is, obtain M modulation symbols mapped in a one-to-one manner with the M bit sequences to be modulated. The bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes a bit sequence to be modulated, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to one modulation symbol, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode adopted by the sending device.
Optionally, the sending device determines a mapping relationship between the bit sequence and the modulation symbol according to the set modulation mode. Taking binary bits as an example, if the modulation order of the set modulation scheme is L, that is, the bit sequence modulated by the set modulation scheme includes L bits, the bit sequence modulated by the set modulation scheme has 2LIt is possible that a modulation symbol for modulating an output by the set modulation scheme exists 2LIt is possible to obtain the bit sequence and the modulation symbol according to the set modulation modeMapping relation of the numbers, wherein one bit sequence corresponds to one modulation symbol.
Taking 16QAM as an example, the modulation order of 16QAM is 4, and the bit sequence { b modulated by 16QAM1，b2，b3，b4Can have 24The modulation symbol of the 16QAM modulation output also has 2 as 16 possible416 forms are possible. For example, the mapping relationship between the bit sequence and the modulation symbol determined according to the modulation scheme 16QAM can be shown as the following table, where the relationship between a and b satisfies a2+b21, for example
Watch 1
| Bit sequence b1，b2，b3，b4} | Modulation symbol for bit sequence mapping |
| 0000 | -b+b*j |
| 0001 | a+b*j |
| 0010 | -a+b*j |
| 0011 | b+b*j |
| 0100 | -b-a*j |
| 0101 | a-b*j |
| 0110 | -a-b*j |
| 0111 | b-a*j |
| 1000 | -b+a*j |
| 1001 | a+a*j |
| 1010 | -a+a*j |
| 1011 | b+a*j |
| 1100 | -b-b*j |
| 1101 | a-b*j |
| 1110 | -a-b*j |
| 1111 | b-b*j |
In the third step, the bit sequence { b ] to be modulated can be obtained by looking up the table one3，b1，b4，b2Mapped modulation symbol S1And a bit sequence to be modulated
Mapped modulation symbol S2. For example, { b3，b1，b4，b2When the modulation symbol S is {0, 1, 1, 0}, obtaining the modulation symbol S mapped by {0, 1, 1, 0} through inquiring the table one1Is-a-b x j;
for {1, 1, 0, 0}, the modulation symbol S mapped by {1, 1, 0, 0} is obtained by looking up the table one2Is-b-b x j.
If the set modulation mode includes at least two modulation modes of a plurality of modulation modes with the same modulation order, determining a mapping relationship between the bit sequence and the modulation symbol according to each modulation mode, where one mapping relationship between the bit sequence and the modulation symbol determined according to one modulation mode is that one bit sequence is mapped to one modulation symbol, for example, one modulation mode may determine a mapping relationship list similar to that shown in table one. When M bit sequences to be modulated are modulated according to the determined mapping relation between the bit sequences and the modulation symbols, for one bit sequence to be modulated, the adopted modulation mode is determined, and the modulation symbols mapped by the bit sequence to be modulated are determined by searching the mapping relation list corresponding to the modulation mode.
The second scheme comprises the following steps:
the method comprises the following steps: the sending equipment rearranges the bit positions in the bit sequence to be sent according to the M bit position arrangement sequences respectively to obtain M bit sequences to be modulated.
Wherein, the bit position arrangement sequence can be either qualitative or random.
Step two: and the sending equipment modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively according to the set modulation mode to obtain M modulation symbols.
The modulation method for modulating the M bit sequences to be modulated may be one modulation method or at least two modulation methods among multiple modulation methods with the same modulation order, and when at least two modulation methods among the multiple modulation methods are adopted, the types of the adopted modulation methods are less than or equal to M.
Illustrate scheme two
Suppose that the set modulation mode is 16QAM, the modulation order of 16QAM is 4, and the bit sequence to be transmitted is { b }1，b2，b3，b4}. In the first step, the sequence is arranged according to the M-2 bit positions, and the pairs { b ═ b1，b2，b3，b4Rearranging the bit positions in the sequence to obtain 2 bit sequences to be modulated, wherein the bit sequences are { b }3，b1，b4，b2And { b }and1，b3，b2，b4}. In the second step, 16QAM is adopted to treat the modulated bit sequences { b }respectively3，b1，b4，b2And { b }and1，b3，b2，b4Modulate to get 2 modulation symbols S1And S2。
Optionally, in the second step, the sending device may map each bit sequence to be modulated to obtain one modulation symbol by searching a mapping relationship between the bit sequence and the modulation symbol, that is, obtain M modulation symbols mapped in a one-to-one manner with the M bit sequences to be modulated. The bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes a bit sequence to be modulated, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to one modulation symbol, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode adopted by the sending device.
Optionally, the sending device determines a mapping relationship between the bit sequence and the modulation symbol according to the set modulation mode. Taking binary bits as an example, if the modulation order of the set modulation scheme is L, that is, the bit sequence modulated by the set modulation scheme includes L bits, the bit sequence modulated by the set modulation scheme has 2LIt is possible that a modulation symbol for modulating an output by the set modulation scheme exists 2LPossibly, a bit sequence and modulation are obtained according to the set modulation modeA mapping of symbols, wherein a bit sequence corresponds to a modulation symbol.
Taking 16QAM as an example, the modulation order of 16QAM is 4, and the bit sequence { b modulated by 16QAM1，b2，b3，b4Can have 24The modulation symbol of the 16QAM modulation output also has 2 as 16 possible416 possibilities. For example, the mapping relationship between the bit sequence and the modulation symbol determined according to the modulation scheme 16QAM can be as shown in table one, where the relationship between a and b satisfies a2+b21, for example
In the second step, the bit sequence { b ] to be modulated can be obtained by looking up the table I3，b1，b4，b2Mapped modulation symbol S1And a bit sequence to be modulated b1，b3，b2，b4Mapped modulation symbol S2. For example, { b3，b1，b4，b2When the modulation symbol S is {0, 1, 1, 0}, obtaining the modulation symbol S mapped by {0, 1, 1, 0} through inquiring the table one1Is-a-b x j; { b1，b3，b2，b4When the modulation symbol S is {1, 0, 0, 1}, obtaining the modulation symbol S mapped by {1, 0, 0, 1} through inquiring the table one2Is a + a j.
If the set modulation mode includes at least two modulation modes of a plurality of modulation modes with the same modulation order, determining a mapping relationship between the bit sequence and the modulation symbol according to each modulation mode, where one mapping relationship between the bit sequence and the modulation symbol determined according to one modulation mode is that one bit sequence is mapped to one modulation symbol, for example, one modulation mode may determine a mapping relationship list similar to that shown in table one. When M bit sequences to be modulated are modulated according to the determined mapping relation between the bit sequences and the modulation symbols, for one bit sequence to be modulated, the adopted modulation mode is determined, and the modulation symbols mapped by the bit sequence to be modulated are determined by searching the mapping relation list corresponding to the modulation mode.
The third scheme comprises the following steps:
the sending equipment maps the bit sequence to be sent to obtain M modulation symbols according to the bit sequence to be sent and the mapping relation between the bit sequence and the modulation symbols;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes a bit sequence to be transmitted, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to M modulation symbols, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
Optionally, the sending device determines a mapping relationship between the bit sequence and the modulation symbol according to the set modulation mode. Taking binary bits as an example, if the modulation order of the set modulation scheme is L, that is, the bit sequence modulated by the set modulation scheme includes L bits, there are 2L possibilities for the bit sequence modulated by the set modulation scheme, and there are 2 modulation symbols modulated and output by the set modulation schemeLAnd (4) carrying out the following steps. Obtaining the mapping relation between the bit sequence and the modulation symbol according to the set modulation mode, wherein the mapping relation comprises 2 bit sequencesLFor any one bit sequence, from 2LM modulation symbols are selected from the modulation symbols as modulation symbols mapped by the arbitrary bit sequence, wherein the selection mode for selecting the M modulation symbols may be either qualitative or random. Therefore, in the mapping relationship between the bit sequence and the modulation symbol obtained according to the set modulation scheme, any one bit sequence corresponds to M modulation symbols.
Example III
Taking 16QAM as an example, the modulation order of 16QAM is 4, and the bit sequence { b modulated by 16QAM1，b2，b3，b4Can have 24The modulation symbol of the 16QAM modulation output also has 2 as 16 possible4Each bit sequence maps to two modulation symbols, which is 16 possible.
Illustratively, according to toneThe mapping relationship between the bit sequence and the modulation symbol determined by the system 16QAM can be shown in table two, where the relationship between a and b satisfies a2+b21, for example
Watch two
Through the second lookup table, the bit sequence b to be sent can be determined1，b2，b3，b4Two modulation symbols S of the mapping1And S2For example, { b1，b2，b3，b4When the symbol is {1, 0, 0, 1}, obtaining the modulation symbol S mapped by {1, 0, 0, 1} through looking up the second table1Is a + a x j, S2Is-b-b x j.
After M modulation symbols are obtained through the three schemes, the sending device may map the obtained M modulation symbols to M resource units one to one through S302 provided in the embodiment of the present invention, and send the M modulation symbols to the receiving device. As shown in fig. 4, taking M-2 and the resource unit as a time-frequency resource unit as an example, the transmitting device obtains 2 modulation symbols S1And S2Then, modulating the symbol S1And S2One-to-one mapping is carried out on the 2 resource units, and the mapping is sent to the receiving device.
As shown in fig. 5, on the receiving device side, an embodiment of the present invention provides a modulation symbol transmission method, where the transmitting device transmits a modulation symbol to a receiving device by using the above method, where the method includes:
s501, receiving M modulation symbols sent by a sending device on M resource units in a mapping manner, wherein M is an integer greater than 1, and M modulation symbols are obtained by modulating a bit sequence to be sent by the sending device;
s502, the receiving device determines the detection information of the bit sequence to be sent of the sending device according to the M modulation symbols.
The detection information of the bit sequence to be transmitted comprises a hard decision result of the bit sequence to be transmitted and/or soft information of the bit sequence to be transmitted. The hard decision result refers to a bit sequence obtained by the decision of the receiving equipment; there are several ways in which soft information can be represented. Illustratively, for bit b in the bit sequence to be transmitted1The soft information of which at the receiving device can be represented asWherein P (b)11) denotes b derived by detection by the receiving device1Probability of 1, P (b)10) indicates b detected by the receiving device1A probability of 0, the soft information of the bit sequence to be transmitted can be represented as
The receiving device may determine, by using a joint detection method, detection information of a bit sequence to be transmitted of the transmitting device according to the M modulation symbols. The method of detection may comprise: the receiving device receives M modulation symbols on M resource units, symbol combination is carried out on the received M modulation symbols, and the receiving device demodulates the symbols obtained after combination to obtain a hard decision result of a bit sequence to be sent. The method for checking detection can also comprise the following steps: the receiving device respectively carries out soft demodulation on the modulation symbols transmitted on each resource unit to obtain soft information corresponding to different bits in a bit sequence to be transmitted, combines the soft information corresponding to the same bits, and finally recovers the bit sequence to be transmitted by using the soft information corresponding to the different bits after combination. Combining methods such as maximal ratio combining, which is a receive diversity combining method, refer to combining signals equal to a weighted sum of the signals received on each resource element.
It should be noted that the modulation symbol transmission method on the receiving device side provided in the embodiment of the present invention is based on a consistent idea with the modulation symbol transmission method on the transmitting device side, and the modulation symbol transmission method on the receiving device side can be implemented by combining the means in the prior art.
In the technical solution provided by the embodiment of the present invention, a transmitting device modulates a bit sequence to be transmitted into a plurality of modulation symbols, and transmits the plurality of modulation symbols to a receiving device through a plurality of resource units. According to the scheme, the sending equipment modulates the bit sequence to be sent into a plurality of modulation symbols, so that the sending equipment averages the reliability of bit information carried by the transmitted modulation symbols, the reliability difference between different bit information carried by the modulation symbols is improved, the error probability of the bit sequence to be sent of the sending equipment, which is obtained by the receiving equipment through the detection of the modulation symbols, is reduced, and the communication performance of the system is improved.
The wireless communication system in the embodiment of the invention adopts a spread spectrum technology, the transmitting equipment modulates the bit sequence to be transmitted into a plurality of modulation symbols and then transmits the modulation symbols to the receiving equipment through the resource units with the same number as the modulation symbols, and the probability that a plurality of resource units simultaneously experience serious wireless channel multipath fading and interference is far less than the probability that a single resource unit experiences serious fading and interference, thereby reducing the risk of transmission of modulation signals. The receiving device may use a joint detection method to improve the signal-to-interference-and-noise ratio of the received modulation symbols. Therefore, the spread spectrum technology adopted in the embodiment of the invention can reduce the error probability of bit detection of the receiving equipment so as to improve the reliability of communication.
Fig. 6 is a sending device according to an embodiment of the present invention, where the sending device may adopt the method provided in the corresponding embodiment of fig. 3. The transmission apparatus 600 includes: a processing module 601 and a sending module 602. Wherein the content of the first and second substances,
a processing module 601, configured to modulate a bit sequence to be transmitted into M modulation symbols according to a set modulation manner, where M is an integer greater than 1; determining M resource units, and mapping M modulation symbols to the M resource units one to one;
a sending module 602, configured to send the M modulation symbols mapped one-to-one to the M resource units by the processing module 601 to a receiving device.
Optionally, when the processing module 601 modulates the bit sequence to be transmitted into M modulation symbols according to the set modulation mode, the processing module is specifically configured to:
the processing module 601 rearranges the bit positions in the bit sequence to be transmitted according to the arrangement sequence of the M kinds of bit positions, respectively, to obtain M bit sequences to be modulated;
the processing module 601 modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively according to the set modulation mode, so as to obtain M modulation symbols.
Optionally, before the processing module 601 modulates each bit sequence to be modulated in the M bit sequences to be modulated, the processing module is further configured to:
the processing module 601 selects a set number of bit sequences to be modulated from the M bit sequences to be modulated;
for each bit sequence to be modulated in the bit sequence to be modulated with the set number, the processing module 601 performs an inversion operation on bits at set positions in each bit sequence to be modulated.
Optionally, the processing module 601 respectively modulates each bit sequence to be modulated in the M bit sequences to be modulated, and when obtaining M modulation symbols, the method includes specifically configured to:
the processing module 601 respectively maps each bit sequence to be modulated to obtain a modulation symbol according to each bit sequence to be modulated and the mapping relationship between the bit sequence and the modulation symbol;
the bit sequence in the mapping relation between the bit sequence and the modulation symbol comprises a bit sequence to be modulated, the mapping relation between the bit sequence and the modulation symbol is that one bit sequence is mapped to one modulation symbol, and the number of bits contained in the bit sequence is equal to the modulation order of the set modulation mode.
Optionally, when the processing module 601 modulates the bit sequence to be transmitted into M modulation symbols, the processing module is specifically configured to:
the processing module 601 maps the bit sequence to be transmitted to obtain M modulation symbols according to the bit sequence to be transmitted and the mapping relationship between the bit sequence and the modulation symbols;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes a bit sequence to be transmitted, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to M modulation symbols, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
Optionally, the set modulation scheme includes one modulation scheme or at least two modulation schemes of multiple modulation schemes with the same modulation order.
It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Based on the above embodiments, an embodiment of the present invention further provides a sending device, where the sending device may adopt the method provided in the embodiment corresponding to fig. 3, and may be the same device as the sending device shown in fig. 6. Referring to fig. 7, the transmitting apparatus 700 includes: a processor 701, a transmitter 702, a bus 703, and a memory 704, wherein:
the processor 701, the transmitter 702, and the memory 704 are connected to each other by a bus 703; the bus 703 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 7, but this is not intended to represent only one bus or type of bus.
The processor 701 in fig. 7 corresponds to the processing module 601 in fig. 6, and the transmitter 702 in fig. 7 corresponds to the transmitting module 602 in fig. 6. The transmitting device 700 also includes a memory 704 for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 704 may comprise Random Access Memory (RAM) and may also include non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 701 executes the application program stored in the memory 704 to implement the modulation symbol transmission method as described above.
Fig. 8 is a receiving device according to an embodiment of the present invention, where the receiving device may adopt the method provided in the corresponding embodiment of fig. 5. The reception apparatus 800 includes: a receiving module 801 and a processing module 802. Wherein the content of the first and second substances,
a receiving module 801, configured to receive M modulation symbols sent by a sending device mapped on M resource units, where M is an integer greater than 1, and the M modulation symbols are obtained by the sending device modulating a bit sequence to be sent according to a set modulation mode;
the processing module 802 determines detection information of a bit sequence to be transmitted of the transmitting device according to the M modulation symbols received by the receiving module 801.
Optionally, the detection information of the bit sequence to be transmitted of the transmission device includes a hard decision result of the bit sequence to be transmitted and/or soft information of the bit sequence to be transmitted.
Based on the above embodiments, an embodiment of the present invention further provides a receiving device, where the receiving device may adopt the method provided in the embodiment corresponding to fig. 5, and may be the same device as the receiving device shown in fig. 8. Referring to fig. 9, the receiving apparatus 900 includes: a receiver 901, a processor 902, a bus 903, and a memory 904, wherein:
the receiver 901, the processor 902 and the memory 904 are interconnected by a bus 903; for ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus.
The receiver 901 in fig. 9 corresponds to the receiving module 801 in fig. 8, and the processor 902 in fig. 9 corresponds to the processing module 802 in fig. 8. The receiving apparatus 900 further includes a memory 904 for storing a program and the like. In particular, the program may include program code comprising computer operating instructions. Processor 902 executes an application program stored in memory 904 to implement the modulation symbol transmission method described above.
Based on the above embodiments, an embodiment of the present invention provides a wireless communication system, as shown in fig. 10, the wireless communication system 1000 includes a sending device 1001 and a receiving device 1002, where the sending device 1001 is configured to implement the functions implemented by the sending device in the above embodiments, and the receiving device 1002 is configured to implement the functions implemented by the receiving device in the above embodiments.
In summary, embodiments of the present application provide a modulation symbol transmission method, a sending device, and a receiving device, so as to reduce an error probability of a bit sequence to be sent of the sending device, which is obtained by the receiving device through modulation symbol detection, and improve system communication performance.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (8)
1. A method for transmitting modulation symbols, comprising:
the method comprises the steps that a sending device modulates a bit sequence to be sent into M modulation symbols according to a set modulation mode, wherein M is an integer larger than 1;
the sending equipment determines M resource units, maps the M modulation symbols to the M resource units in a one-to-one manner, and sends the M modulation symbols to receiving equipment;
the method for modulating a bit sequence to be transmitted into M modulation symbols by the transmitting equipment according to a set modulation mode comprises the following steps:
the sending equipment rearranges the bit positions in the bit sequence to be sent according to the arrangement sequence of the M bit positions respectively to obtain M bit sequences to be modulated;
the sending equipment modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively according to the set modulation mode to obtain the M modulation symbols; or the like, or, alternatively,
the sending equipment maps the bit sequence to be sent to obtain M modulation symbols according to the bit sequence to be sent and the mapping relation between the bit sequence and the modulation symbols;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes the bit sequence to be transmitted, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to M modulation symbols, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
2. The method of claim 1, wherein before the transmitting device separately modulates each of the M bit sequences to be modulated, further comprising:
the sending equipment selects a set number of bit sequences to be modulated from the M bit sequences to be modulated;
and for each bit sequence to be modulated in the set number of bit sequences to be modulated, the sending equipment performs an inversion operation on bits at set positions in each bit sequence to be modulated.
3. The method of claim 1, wherein the transmitting device separately modulates each of the M bit sequences to be modulated to obtain the M modulation symbols, comprising:
the sending equipment respectively maps each bit sequence to be modulated to obtain a modulation symbol according to each bit sequence to be modulated and the mapping relation between the bit sequence and the modulation symbol;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes the bit sequence to be modulated, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to one modulation symbol, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
4. The method according to any one of claims 1 to 3, wherein the set modulation scheme comprises at least two modulation schemes among one modulation scheme or a plurality of modulation schemes with the same modulation order.
5. A transmitting device, comprising:
the processing module is used for modulating a bit sequence to be transmitted into M modulation symbols according to a set modulation mode, wherein M is an integer greater than 1; determining M resource units, and mapping the M modulation symbols to the M resource units in a one-to-one manner;
a sending module, configured to send the M modulation symbols one-to-one mapped onto M resource units by the processing module to a receiving device;
when the processing module modulates the bit sequence to be transmitted into M modulation symbols according to the set modulation mode, the processing module is specifically configured to:
the processing module rearranges the bit positions in the bit sequence to be transmitted according to the arrangement sequence of the M bit positions respectively to obtain M bit sequences to be modulated;
the processing module modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively according to the set modulation mode to obtain the M modulation symbols; or the like, or, alternatively,
the processing module maps the bit sequence to be sent to obtain M modulation symbols according to the bit sequence to be sent and the mapping relation between the bit sequence and the modulation symbols;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes the bit sequence to be transmitted, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to M modulation symbols, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
6. The transmitting device as claimed in claim 5, wherein before the processing module modulates each bit sequence to be modulated in the M bit sequences to be modulated, the processing module is further configured to:
the processing module selects a set number of bit sequences to be modulated from the M bit sequences to be modulated;
and for each bit sequence to be modulated in the set number of bit sequences to be modulated, the processing module performs an inversion operation on bits at set positions in each bit sequence to be modulated.
7. The transmitter apparatus as claimed in claim 5, wherein the processing module modulates each bit sequence to be modulated in the M bit sequences to be modulated respectively, and when obtaining the M modulation symbols, the processing module is specifically configured to:
the processing module maps each bit sequence to be modulated to obtain a modulation symbol according to each bit sequence to be modulated and the mapping relation between the bit sequence and the modulation symbol;
the bit sequence in the mapping relationship between the bit sequence and the modulation symbol includes the bit sequence to be modulated, the mapping relationship between the bit sequence and the modulation symbol is that one bit sequence is mapped to one modulation symbol, and the number of bits included in the bit sequence is equal to the modulation order of the set modulation mode.
8. The transmission apparatus according to any one of claims 5 to 7, wherein the set modulation scheme includes at least two modulation schemes among one modulation scheme or a plurality of modulation schemes having the same modulation order.
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| CN101714962A (en) * | 2008-10-07 | 2010-05-26 | 富士通株式会社 | Hierarchical modulating method, hierarchical de-modulating method, transmitter and receiver |
| CN102857328A (en) * | 2007-10-10 | 2013-01-02 | 三星电子株式会社 | Asynchronous hybrid ARQ process indication in a wireless communication system |
| CN103580834A (en) * | 2012-07-31 | 2014-02-12 | 中兴通讯股份有限公司 | ePDCCH transmitting and receiving method, device, base station and user device |
| WO2014168438A1 (en) * | 2013-04-10 | 2014-10-16 | 주식회사 팬택 | Apparatus and method for configuring reference signal in wireless communication system supporting small cell |
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| CN102857328A (en) * | 2007-10-10 | 2013-01-02 | 三星电子株式会社 | Asynchronous hybrid ARQ process indication in a wireless communication system |
| CN101714962A (en) * | 2008-10-07 | 2010-05-26 | 富士通株式会社 | Hierarchical modulating method, hierarchical de-modulating method, transmitter and receiver |
| CN103580834A (en) * | 2012-07-31 | 2014-02-12 | 中兴通讯股份有限公司 | ePDCCH transmitting and receiving method, device, base station and user device |
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