WO2016169414A1 - 一种多用户信息处理方法及装置 - Google Patents

一种多用户信息处理方法及装置 Download PDF

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WO2016169414A1
WO2016169414A1 PCT/CN2016/078850 CN2016078850W WO2016169414A1 WO 2016169414 A1 WO2016169414 A1 WO 2016169414A1 CN 2016078850 W CN2016078850 W CN 2016078850W WO 2016169414 A1 WO2016169414 A1 WO 2016169414A1
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user information
users
group
user
sequence
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PCT/CN2016/078850
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English (en)
French (fr)
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袁志锋
戴建强
胡留军
郁光辉
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中兴通讯股份有限公司
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Publication of WO2016169414A1 publication Critical patent/WO2016169414A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes

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  • This paper relates to the field of multi-user information processing technology, especially a multi-user information processing method and device.
  • each user information is differentiated by spreading code spreading, and each digitally modulated data symbol is first extended by a spreading sequence of length K, each of which has been extended.
  • the modulated data symbols are spread into a K-length symbol sequence, and then all extended symbol sequences can be transmitted on the same time-frequency resource.
  • the longer the extended sequence length the easier the correlation between the extended sequences is.
  • IS-95 uses a 64-bit Walsh (Walsh sequence) code
  • CDMA2000 uses a longer spreading code to obtain a larger system.
  • the CDMA receiver receives the combined signals of all the extended signals, and treats the interference from other users as additive noise, and separates its own information from the combined signal by its own extended sequence through multi-user detection technology. When the number of users exceeds 100% load, its performance drops dramatically.
  • multi-user information can also be broadcast by a multiplexing method such as FDM (Frequency Division Multiplexing) or OFDM (Orthogonal Frequency Division Multiplexing). Broadcasting here means that the transmitter superimposes the modulation symbols of different user information and simultaneously transmits them to multiple receivers, and different users extract their own information from the received composite signals.
  • FDM Frequency Division Multiplexing
  • OFDM Orthogonal Frequency Division Multiplexing
  • the "superimposed coding" is to directly superimpose modulation symbols of a plurality of UEs (user equipments or terminals) in the power domain.
  • the UE receives the superimposed symbols superimposed by each user symbol.
  • each user information interferes with each other.
  • the receiving end needs to perform serial interference cancellation (SIC) separation information.
  • SIC serial interference cancellation
  • the technical problem to be solved by the present invention is to provide a multi-user information processing method and apparatus to improve system performance.
  • a multi-user information processing method includes:
  • the user information of the n users in the i group is separately processed to obtain i mixed symbols
  • the i mixed symbols are respectively extended by using i k-length sequences to obtain i K-length symbol sequences, wherein the K is a positive integer.
  • the method further includes: forming the sequence of symbols obtained by i k long to form a transmission signal, and sending the signal to multiple users in the i group.
  • the method further includes: combining the i k long symbol sequences to obtain a combined symbol sequence.
  • the method further includes: forming the combined symbol sequence to form a transmit signal and transmitting the signal to a plurality of users.
  • the step of separately performing the mixing process on the user information of the n users in the i group include:
  • the user information of n users in each group is logically operated before modulation, and then mixed after being modulated.
  • the step of mixing the user information of the n users in each group after modulation includes:
  • the user information of n users in each group is modulated to obtain n user modulation symbols, and the n user modulation symbols are added.
  • the step of mixing user information of n users in each group before modulation includes:
  • the user information of n users in each group is mixed by bit combination before modulation.
  • the step of performing logical operations on the user information of the n users in each group before the modulation, and then performing the mixing after the modulation comprises:
  • n user modulation symbols are obtained by modulation, and the n user modulation symbols are added, and all possible constellation points of the mixed symbols obtained after the addition are added.
  • the constellation diagram consists of a Gray mapping property.
  • the step of performing logical operations on partial bit information of n users in each group includes:
  • bit information of the first user in each group is XORed with the partial bit information of the second user, and the operation result is used as a part of the new second user bit information, and the second user who does not perform the logical operation Part of the bit information is used as another part of the new second user bit information.
  • sequence of i k lengths satisfies one or more of the following conditions:
  • the sequence of i k lengths includes a real sequence and/or a complex sequence
  • sequences of the i K lengths are the same or different;
  • the i k long sequences are mutually orthogonal or non-orthogonal sequences.
  • the step of forming the sequence of symbols obtained by i k long to form a transmit signal includes:
  • Time-frequency resource includes multiple frequency domain resources corresponding to the same time domain resource, or the same frequency domain resource corresponding to multiple different time domain resources, Or multiple frequency domain resources corresponding to multiple different time domain resources.
  • the i-K long symbol sequence is placed in a continuous bandwidth in the frequency domain, or is dispersed in the entire frequency band.
  • a multi-user information processing apparatus includes a mixing module and an expansion module, wherein:
  • the mixing module is configured to: divide user information into groups of i, each group of user information of n users, and respectively perform mixing processing on user information of n users in the group i to obtain i mixed symbols, wherein Where i is a positive integer, the n is a positive integer, and n ⁇ 2,;
  • the expansion module is configured to expand the i mixed symbols by using a sequence of i K lengths to obtain i k long symbol sequences, where the K is a positive integer.
  • the device further includes a transmitting module, wherein
  • the sending module is configured to: form the transmitted signal with the obtained k-length symbol sequence and send the signal to a plurality of users in the i group.
  • the apparatus further includes a merging module, configured to merge the i k-length symbol sequences to obtain a combined symbol sequence.
  • a merging module configured to merge the i k-length symbol sequences to obtain a combined symbol sequence.
  • the apparatus further includes a sending module, configured to form the combined symbol sequence to transmit a signal to multiple users.
  • a sending module configured to form the combined symbol sequence to transmit a signal to multiple users.
  • the mixing module is configured to separately perform user processing on user information of n users in the i group according to the following manner:
  • the mixing module mixes the user information of the n users in each group by mixing;
  • the mixing module mixes user information of n users in each group before modulation; or
  • the mixing module performs logical operations on the user information of the n users in each group before modulation, and then mixes them after modulation.
  • the mixing module is configured to mix the user information of the n users in each group according to the following manner:
  • the mixing module modulates user information of n users in each group to obtain n user modulation symbols, and adds the n user modulation symbols.
  • the mixing module is configured to mix user information of n users in each group before modulation according to the following manner:
  • the mixing module mixes user information of n users in each group by bit combination before modulation.
  • the mixing module is configured to perform logical operations on the user information of the n users in each group before modulation, and then mix and mix according to the following manner:
  • the mixing module logically operates part of the bit information of n users in each group, and obtains n user modulation symbols after modulation, adds the n user modulation symbols, and adds the mixed symbols.
  • a constellation of all possible constellation points has a Gray mapping property.
  • the mixing module is configured to perform logical operations on partial bit information of n users in each group as follows:
  • the mixing module performs an exclusive OR operation on the bit information of the first user in each group and the partial bit information of the second user, and the operation result is not part of the new second user bit information, and is not logically operated. Part of the bit information of the second user is taken as another part of the new second user bit information.
  • sequence of i k lengths satisfies one or more of the following conditions:
  • the sequence of i k lengths includes a real sequence and/or a complex sequence
  • sequences of the i K lengths are the same or different;
  • the i k long sequences are mutually orthogonal or non-orthogonal sequences.
  • the sending module is configured to form, according to the manner, the sequence of symbols obtained by i k long into a transmission signal:
  • the sending module maps the sequence of the k-length symbols to the time-frequency resource, where the time-frequency resource includes multiple frequency-domain resources corresponding to the same time-domain resource, or multiple time-domain resources The same frequency domain resource, or multiple frequency domain resources corresponding to multiple different time domain resources.
  • the sending module places the i-K long symbol sequence in a continuous bandwidth on the frequency domain, or is dispersed in the entire frequency band. Place.
  • the time-frequency domain diversity gain is obtained by spreading the mixed symbols to at least solve the problem that when the mixed symbols are transmitted in the downlink, in the actual fading channel, the single symbol after the deep fading is greatly missed by the receiving end.
  • the advantages of the embodiments of the present invention include: the system obtains the diversity gain, and the terminal obtains better SIC robustness; the system can be fully bandwidth-scheduled, which is simple and convenient.
  • Figure 1 is a flow chart of Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of a device according to Embodiment 2 of the present invention.
  • FIG. 3 is a processing diagram of application unit 1 multi-user information at a transmitter
  • 4 is a schematic diagram of direct superposition of an application example 1QPSK symbol and a 16QAM symbol;
  • FIG. 6 is a processing diagram of application unit 2 multi-user information at a transmitter
  • FIG. 8 is a process of processing the multi-user information of the application example 3 at the transmitter.
  • This embodiment describes a multi-user information processing method, as shown in FIG. 1, including:
  • Step 110 Divide the user information into i groups, each group containing user information of n users, where i is a positive integer (ie, i ⁇ 1), the n is a positive integer and n ⁇ 2, respectively, in the i group User information of n users is mixed to obtain i mixed symbols;
  • the foregoing separately processes the user information of the n users in the i group, and may adopt one of the following manners:
  • the user information of the n users in each group is modulated and mixed
  • n users in each group is modulated to obtain n user modulation symbols, and the n user modulation symbols are added.
  • the user information of the n users in each group is mixed before modulation
  • the user information of n users in each group is mixed by bit combination before modulation.
  • the constellation consisting of all possible constellation points of the mixed symbols obtained after the addition has a Gray mapping property.
  • the user information of the n users in each group is logically operated before modulation, and then mixed after being modulated.
  • n user modulation symbols are obtained by modulation, and the n user modulation symbols are added, and all the mixed symbols obtained are added.
  • a constellation of possible constellation points has a Gray mapping property.
  • the bit information of the first user in each group is XORed with the partial bit information of the second user, and the operation result is a part of the new second user bit information, and the logical operation is not performed.
  • the partial bit information of the two users is another part of the new second user bit information.
  • the mixed symbol obtained after this step contains information of a plurality of users, and other user information is interference information with respect to the user information.
  • Step 120 The i mixed symbols are respectively extended by using a sequence of i K lengths to obtain i K long symbol sequences, and the K is a positive integer.
  • the obtained extended symbol is a K long symbol sequence, and information of a plurality of users is expanded into K symbols.
  • the above method further includes
  • Step 130 The obtained symbol sequence of i K lengths is formed into a transmission signal and sent to a plurality of users in the i group.
  • the method further includes:
  • Step 130' combining the i-K long symbol sequences to obtain a combined symbol sequence
  • the method further includes: Step 140, forming the combined symbol sequence to form a transmission signal and transmitting the signal to a plurality of users.
  • the symbol sequence is mapped to a time-frequency resource, where the time-frequency resource includes multiple frequency domain resources corresponding to the same time domain resource, or multiple different time domains.
  • the symbol sequence may be placed in a continuous bandwidth on the frequency domain or distributed over the entire frequency band. That is, information of multiple users can be sent in a wider time domain resource or a wider frequency domain resource.
  • the mixed symbol is extended by a sequence of K long to obtain an extended symbol, and the expanded symbols are combined to obtain a combined symbol.
  • the combined symbols are formed into a transmitted signal.
  • the system can obtain the diversity gain, the terminal obtains better SIC robustness, and the system can be fully bandwidth-scheduled, which is simple and convenient.
  • This embodiment describes a multi-user information processing apparatus that implements the method of Embodiment 1 above.
  • the present invention includes a mixing module 201 and an expansion module 202, where:
  • the mixing module 201 is configured to: divide user information into groups i, each group includes user information of n users, the i is a positive integer, and the n is a positive integer and n ⁇ 2, respectively for the i group User information of n users is mixed to obtain i mixed symbols;
  • the expansion module 202 is configured to expand the i mixed symbols by using a sequence of i K lengths to obtain i K long symbol sequences, where K is a positive integer.
  • the apparatus further includes a sending module, configured to: form the transmitted signal of the k-length symbol sequences to be sent to a plurality of users in the i group.
  • the apparatus further includes a merging module, configured to: merge the i k long symbol sequences to obtain a combined symbol sequence.
  • the apparatus further includes a sending module, configured to: form the combined symbol sequence to form a transmit signal, and send the signal to multiple users.
  • a sending module configured to: form the combined symbol sequence to form a transmit signal, and send the signal to multiple users.
  • the mixing module 201 separately performs the mixing processing on the user information of the n users in the i group, and may adopt one of the following methods:
  • the mixing module 201 modulates the user information of the n users in each group and mixes them;
  • the mixing module 201 mixes user information of n users in each group before modulation
  • the mixing module 201 performs logical operations on the user information of the n users in each group before modulation, and then mixes them after modulation.
  • the sending module is configured to: the transmitting module is configured to map the symbol sequence to a time-frequency resource, where the time-frequency resource includes multiple frequency domain resources corresponding to the same time domain resource, or multiple The same frequency domain resource corresponding to different time domain resources, or multiple different time domains Multiple frequency domain resources corresponding to the resource.
  • the sending module places the symbol sequence in a continuous bandwidth on the frequency domain, or is dispersed in the entire frequency band.
  • UEs in different groups in the example are separately numbered.
  • UE1 in the first group and UE1 in the fourth group in FIG. 3 are different UEs
  • UE2 in the first group and UE2 in the fourth group are also different UEs.
  • the four mixed symbols are respectively extended by four sequences to obtain four sets of extended symbols, and the four sets of extended symbols are combined to obtain the combined symbols, and the transmitter forms the transmitted symbols into transmission signals and transmits them to one.
  • Figure 3 shows the processing of multi-user information at the transmitter.
  • each group includes two or more pieces of user information. This example is described by taking a group of two pieces of user information as an example.
  • the number of groups may be one or more. In this example, the number of groups is 4 as an example.
  • Step 1 After the UE1 bit information of the first group is encoded, modulated, and allocated with a certain power, a user modulation symbol S11 having a certain power is obtained. After the UE2 bit information of the first group is encoded, modulated, and allocated with a certain power, a user modulation symbol S12 having a certain power is obtained.
  • step 2 S11 and S12 are mixed to obtain a mixed symbol.
  • the mixture of S11 and S12 can be directly obtained by adding two symbols, denoted as S11+S12.
  • FIG. 4 a schematic diagram of a QPSK (Quadrature Phase Shift Keying) symbol and a 16QAM (Quadrature Amplitude Modulation) symbol are directly added.
  • the data shown in black in the figure is taken as an example of two specific cases. The first one: the QPSK symbol at "01" and the 16QAM symbol at "1111” are directly added to obtain the symbol at "011111".
  • the second type the QPSK symbol at "11” and the 16QAM symbol at "0111" are directly added to obtain a symbol at "110111".
  • the mixed symbols are extended, and the extension may be direct sequence spread spectrum, or may be frequency hopping spread spectrum, and may also be an extension in the time domain.
  • the direct sequence extension can be implemented as follows: after the four mixed symbols are obtained, the extended sequence used by the four sets of mixed symbols comes from four 4-length sequences in the preset 4 ⁇ 4 extended sequence set, where the four long sequences are This sequence is composed of 4 symbols, which may be, for example, a 4 ⁇ 4 Hadamard matrix, where 1 row or column can be used as a sequence, each sequence having a length of 4. Each group uses one of the four long extension sequences, each of which is different.
  • the purpose of extending the mixed symbols with the extended sequence is to make the extended symbols more widely sprinkled on the time-frequency resources.
  • the length K of the extended sequence is not required.
  • the extended sequence may be a real sequence or a complex sequence, and the i sequences in the extended sequence set may be the same or different. If the i sequences in the extended sequence set are different, the i sequences may be mutually positive. Cross sequence or non-orthogonal sequence.
  • the spreading sequence can expand a modulation symbol into a sequence of 4 long symbols.
  • each set of mixed symbols is expanded by a sequence to generate an extended symbol sequence.
  • a spreading sequence ⁇ C11, C12, C13, C14 ⁇ expands a set of mixed symbols ⁇ S H1 ⁇
  • the mixed symbol is multiplied by a 4-long extended sequence, ie ⁇ C11, C12, C13, C14 ⁇ * ⁇ S H1 ⁇ , obtain another 4 long extended symbol sequence ⁇ C11*S H1 , C12*S H1 , C13*S H1 , C14*S H1 ⁇ .
  • the information or power of the mixed symbol is divided into 4 symbols, or the mixed symbol is carried on a 4-length extended sequence.
  • the four sets of mixed symbols are all extended to obtain the expanded symbols.
  • One extended sequence ⁇ C21, C22, C23, C24 ⁇ expands a set of mixed symbols ⁇ S H2 ⁇ , and the mixed symbols are multiplied by a 4-long extended sequence, ie ⁇ C21, C22, C23, C24 ⁇ * ⁇ S H2 ⁇ , get another 4 long extended symbol sequence ⁇ C21*S H2 , C22*S H2 , C23*S H2 , C24*S H2 ⁇ ; an extension
  • the sequence ⁇ C31, C32, C33, C34 ⁇ expands a set of mixed symbols ⁇ S H3 ⁇ , and the mixed symbol is multiplied by a 4-length extended sequence, ie ⁇ C31, C32, C33, C34 ⁇ * ⁇ S H3 ⁇ , Another 4-length extended symbol sequence ⁇ C31*S H3 , C32*S H3 , C33*S H3 , C34*S H3 ⁇ ; a spreading
  • step 4 the expanded symbol sequence is combined to obtain a combined symbol sequence.
  • the merging includes adding four sets of extended symbol sequences correspondingly, that is, the combined symbols include information of four sets of mixed symbols, which can be expressed as ⁇ C11*S H1 + C21*S H2 + C31*S H3 + C41*S H4 ,C12*S H1 +C22*S H2 +C32*S H3 +C42*S H4 ,C13*S H1 +C23*S H2 +C33*S H3 +C43*S H4 ,C14*S H1 + C24*S H2 +C34*S H3 +C44*S H4 ⁇ .
  • Step 5 Finally, the transmitter (such as the base station) forms a combined signal sequence to form a transmission signal and sends it to multiple UEs. Mapping the combined symbols to time-frequency resources, where the time-frequency resources include multiple frequency domain resources corresponding to the same time domain resource (for example, multiple frequency points at the same time), or the same corresponding to multiple different time domain resources Frequency domain resources (for example, the same frequency point at multiple times), or multiple frequency domain resources corresponding to multiple different time domain resources (for example, multiple frequency points at multiple times). If multiple frequency domain resources correspond to the same time domain resource, the combined symbols may be placed in a continuous bandwidth in the frequency domain, or may be dispersed in the entire frequency band. When the information of the four sets of mixed symbols is transmitted on the same time-frequency resource, a better effect is obtained if the i sequences in the set of spreading sequences used for direct sequence spreading are orthogonal to each other.
  • the time-frequency resources include multiple frequency domain resources corresponding to the same time domain resource (for example, multiple frequency points at the same time
  • the four mixed symbols are respectively extended by four sequences to obtain four sets of extended symbols, and the four sets of extended symbols are combined to obtain the combined symbols, and the transmitter forms the transmitted symbols into transmission signals and transmits them to one.
  • Figure 6 shows the processing of multi-user information at the transmitter.
  • each group includes two or more pieces of user information. This example is described by taking a group of two pieces of user information as an example.
  • the number of groups may be one or more. In this example, the number of groups is 4 as an example.
  • Step 1 The first group of UE1 bit information is encoded to obtain a codeword bit b 5 b 4 , and the first group of UE 2 bit information is encoded to obtain a codeword bit b 3 b 2 b 1 b 0 , and the two user bits are obtained.
  • the combination of information, or two user bit information, is combined and combined into a set of bits b 5 b 4 b 3 b 2 b 1 b 0 .
  • a certain amount of power is allocated and modulated to obtain a mixed symbol.
  • the mixed symbol in this example is a modulation symbol in which multi-user bit information is combined.
  • the codeword bits of UE1 and the codeword bits of UE2 in this example are only examples.
  • the information of the users in the group is not directly mixed and mixed by the modulation symbols, but is mixed by the combination of bits.
  • one set can be set to a high order bit and the other set to a low order bit, for example, a two-bit UE1 codeword bit and a 4-bit UE2 codeword bit are combined into a set of 6 bits.
  • the codeword bits of UE1 are high order bits and the codeword bits of UE2 are low order bits.
  • Figure 7 is a schematic diagram of a set of two bits and a set of four bits combined and modulated.
  • the data shown in black in the figure is randomly taken as an example of two specific cases.
  • the information "11” is merged with the UE2 bit information "0111” to obtain a set of bits "110111”.
  • the bit group "010111” and the bit group "110111” are mapped onto the constellation map, respectively, and so on, and the constellation composed of all possible constellation points of the mixed symbol has the Gray mapping property.
  • step 2 the mixed symbols are expanded.
  • direct sequence expansion is taken as an example for description.
  • the extended sequence used by the 4 sets of mixed symbols is derived from the 4 4 long sequences in the preset 4 ⁇ 4 extended sequence set, where the 4 long sequence means that the sequence consists of 4 symbols.
  • the set of extended sequences may, for example, be a 4x4 Hadamard matrix, where one or one column may be a sequence, each sequence having a length of four. Each group uses one of the four long extension sequences, each of which is different.
  • the length K of the extended sequence is not required.
  • the extended sequence may be a real sequence or a complex sequence, and the i sequences in the extended sequence set may be the same or different. If the i sequences in the extended sequence set are different, the i sequences may be mutually positive. Cross sequence or non-orthogonal sequence.
  • the spreading sequence can expand a modulation symbol into a sequence of 4 long symbols.
  • Each set of mixed symbols is extended by a sequence to generate an expanded sequence of symbols.
  • a spreading sequence ⁇ C11, C12, C13, C14 ⁇ expands a set of mixed symbols ⁇ S H1 ⁇ , and the mixed symbol is multiplied by a 4-long extended sequence, ie ⁇ C11, C12, C13, C14 ⁇ * ⁇ S H1 ⁇ , obtain another 4 long extended symbol sequence ⁇ C11*S H1 , C12*S H1 , C13*S H1 , C14*S H1 ⁇ .
  • the information or power of the mixed symbol is divided into 4 symbols, or the mixed symbol is carried on a 4-length extended sequence.
  • the four sets of mixed symbols are all extended to obtain the extended symbols.
  • One extended sequence ⁇ C21, C22, C23, C24 ⁇ expands a set of mixed symbols ⁇ S H2 ⁇ , and the mixed symbols are multiplied by a 4-long extended sequence, ie ⁇ C21, C22, C23, C24 ⁇ * ⁇ S H2 ⁇ , get another 4 long extended symbol sequence ⁇ C21*S H2 , C22*S H2 , C23*S H2 , C24*S H2 ⁇ ; an extension
  • the sequence ⁇ C31, C32, C33, C34 ⁇ expands a set of mixed symbols ⁇ S H3 ⁇ , and the mixed symbol is multiplied by a 4-length extended sequence, ie ⁇ C31, C32, C33, C34 ⁇ * ⁇ S H3 ⁇ , Another 4-length extended symbol sequence ⁇ C31*S H3 , C32*S H3 , C33*S H3 , C34*S H3 ⁇ ; a spreading
  • Step 3 Combine the extended symbol sequences to obtain a combined symbol sequence.
  • the merging includes adding four sets of extended symbol sequences correspondingly, that is, the combined symbols include information of four sets of mixed symbols, which can be expressed as ⁇ C11*S H1 +C21*S H2 +C31*S H3 + C41*S H4 ,C12*S H1 +C22*S H2 +C32*S H3 +C42*S H4 ,C13*S H1 +C23*S H2 +C33*S H3 +C43*S H4 ,C14*S H1 + C24*S H2 +C34*S H3 +C44*S H4 ⁇ .
  • Step 4 Finally, the transmitter forms a combined signal sequence to form a transmission signal and sends it to multiple UEs. Mapping the combined symbols to time-frequency resources, where the time-frequency resources include multiple frequency domain resources corresponding to the same time domain resource (for example, multiple frequency points at the same time), or the same corresponding to multiple different time domain resources Frequency domain resources (for example, the same frequency point at multiple times), or multiple frequency domain resources corresponding to multiple different time domain resources (for example, multiple frequency points at multiple times). If multiple frequency domain resources correspond to the same time domain resource, the combined symbols may be placed in a continuous bandwidth in the frequency domain, or may be dispersed in the entire frequency band. When the information of the four sets of mixed symbols is transmitted on the same time-frequency resource, a better effect is obtained if the i sequences in the set of spreading sequences used for direct sequence spreading are orthogonal to each other.
  • the time-frequency resources include multiple frequency domain resources corresponding to the same time domain resource (for example, multiple frequency points at the same time), or the same corresponding to
  • the four mixed symbols are respectively extended by four sequences to obtain four sets of extended symbols, and the expanded symbols are obtained by combining the four groups of symbols, and the transmitter forms the transmitted signal to transmit the signal to the transmitter.
  • Figure 8 shows the processing of multi-user information at the transmitter.
  • each user information in each group is encoded to obtain a codeword bit, and the codeword bits are subjected to bitwise exclusive OR operation before modulation, and a certain power is allocated and modulated to obtain a mixed symbol, which will be mixed.
  • the symbol is expanded, the expanded symbol is obtained, and the expanded symbols are combined to obtain a combined symbol, and the combined symbols are transmitted to form a transmission signal.
  • Each group includes two or more pieces of user information. This example is described by taking a group of two pieces of user information as an example.
  • the number of groups may be one or more. In this example, the number of groups is 4 as an example. Includes the following steps:
  • Step 1 The first group of UE1 bit information is encoded to obtain a codeword bit b 5 b 4 , and the first group of UE 2 bit information is encoded to obtain a codeword bit b 3 b 2 b 1 b 0 , b 5 b 4 directly Modulated to obtain a modulation symbol with a certain power, and b 3 b 2 b 1 b 0 is first bit-operated with the first group of information bits to obtain a new information bit B 3 B 2 B 1 B 0 and then modulated to obtain a certain power.
  • Modulation symbols, modulation can be used according to the relevant standard modulation methods, such as: BPSK, QPSK, QAM.
  • the new information bits are composed of two parts, one part is calculated by the specific two bits of b 3 b 2 b 1 b 0 and b 5 b 4 , and the other part is kept unchanged by the bits other than the above specific bits.
  • new information bits of the first two B 3 B 2 B 1 B 0 to B 3 B 2 is a first set of information of the first two code word bits b 4 and the second set of information bits of the code word in particular 5 b 2
  • the bit b 3 b 2 is XORed, and the latter two bits are obtained by keeping the bit b 1 b 0 in the b 3 b 2 b 1 b 0 except for the above specific bits.
  • other logical operations may be employed as long as the constellation of all possible constellation points of the obtained mixed symbols has a Gray mapping attribute.
  • the information of the users in the group is not directly added and mixed by the modulation symbols, but the bit information of the UE2 is corrected by the bit operation, and then the modulation and addition are mixed.
  • the constellation composed of all possible constellation points has the Gray mapping property.
  • step 2 the mixed symbols are expanded.
  • direct sequence expansion is taken as an example for description.
  • the extended sequence used by the 4 sets of mixed symbols is derived from the 4 4 long sequences in the preset 4 ⁇ 4 extended sequence set, where the 4 long sequence means that the sequence consists of 4 symbols.
  • the set of extended sequences may, for example, be a 4x4 Hadamard matrix, where one or one column may be a sequence, each sequence having a length of four.
  • Each group uses one of the four long extension sequences, each of which has a different extension sequence.
  • the length K of the extended sequence is not required.
  • the extended sequence may be a real sequence or a complex sequence, and the i sequences in the extended sequence set may be the same or different. If the i sequences in the extended sequence set are different, the i sequences may be mutually positive. Cross sequence or non-orthogonal sequence.
  • the spreading sequence can expand a modulation symbol into a sequence of 4 long symbols.
  • Each set of mixed symbols is extended by a sequence to generate an expanded sequence of symbols.
  • a spreading sequence ⁇ C11, C12, C13, C14 ⁇ expands a set of mixed symbols ⁇ S H1 ⁇ , and the mixed symbol is multiplied by a 4-long extended sequence, ie ⁇ C11, C12, C13, C14 ⁇ * ⁇ S H1 ⁇ , obtain another 4 long extended symbol sequence ⁇ C11*S H1 , C12*S H1 , C13*S H1 , C14*S H1 ⁇ .
  • the information or power of the mixed symbol is divided into 4 symbols, or the mixed symbol is carried on a 4-length extended sequence.
  • the four sets of mixed symbols are all extended to obtain the expanded symbols.
  • One extended sequence ⁇ C21, C22, C23, C24 ⁇ expands a set of mixed symbols ⁇ S H2 ⁇ , and the mixed symbols are multiplied by a 4-long extended sequence, ie ⁇ C21, C22, C23, C24 ⁇ * ⁇ S H2 ⁇ , get another 4 long extended symbol sequence ⁇ C21*S H2 , C22*S H2 , C23*S H2 , C24*S H2 ⁇ ; an extension
  • the sequence ⁇ C31, C32, C33, C34 ⁇ expands a set of mixed symbols ⁇ S H3 ⁇ , and the mixed symbol is multiplied by a 4-length extended sequence, ie ⁇ C31, C32, C33, C34 ⁇ * ⁇ S H3 ⁇ , Another 4-length extended symbol sequence ⁇ C31*S H3 , C32*S H3 , C33*S H3 , C34*S H3 ⁇ ; a spreading
  • Step 3 Combine the extended symbol sequences to obtain a combined symbol sequence.
  • the merging includes four sets of extended symbol sequence corresponding additions, that is, the combined symbols include information of four sets of mixed symbols, which can be expressed as ⁇ C11*S H1 +C21*S H2 +C31*S H3 +C41 *S H4 ,C12*S H1 +C22*S H2 +C32*S H3 +C42*S H4 ,C13*S H1 +C23*S H2 +C33*S H3 +C43*S H4 ,C14*S H1 +C24 *S H2 +C34*S H3 +C44*S H4 ⁇ .
  • Step 4 Finally, the transmitter forms a combined signal sequence to form a transmission signal and sends it to multiple UEs. Mapping the combined symbols to time-frequency resources, where the time-frequency resources include multiple frequency domain resources corresponding to the same time domain resource (for example, multiple frequency points at the same time), or the same corresponding to multiple different time domain resources Frequency domain resources (for example, the same frequency point at multiple times), or multiple frequency domain resources corresponding to multiple different time domain resources (for example, multiple frequency points at multiple times). If multiple frequency domain resources correspond to the same time domain resource, the combined symbols may be placed in a continuous bandwidth in the frequency domain, or may be dispersed in the entire frequency band. When the information of 4 sets of mixed symbols is sent on the same time-frequency resource, if used The direct sequence-spreading spread spectrum sequence set i sequences are orthogonal to each other and will obtain better results.
  • the time-frequency resources include multiple frequency domain resources corresponding to the same time domain resource (for example, multiple frequency points at the same time), or the same corresponding to multiple different time
  • the embodiment of the invention also discloses a computer program, comprising program instructions, which when executed by the transmitter, enable the transmitter to perform any of the above-described multi-user information processing methods.
  • the embodiment of the invention also discloses a carrier carrying the computer program.
  • all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any specific combination of hardware and software.
  • the devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.
  • each device/function module/functional unit in the above embodiment When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium.
  • the above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the time-frequency domain diversity gain is obtained by spreading the mixed symbols to solve at least the mixed symbol is transmitted in the downlink, and under the actual fading channel, the single symbol after the deep fading is received by the receiving end.
  • the possibility of translating is very large. After the deep fading and symbolic SIC, there is a great risk of error propagation, which leads to the problem of reduced access performance.
  • the advantages of the embodiments of the present invention include: the system obtains the diversity gain, and the terminal obtains better SIC robustness; the system can be fully bandwidth-scheduled, which is simple and convenient. Therefore, the present invention has strong industrial applicability.

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Abstract

一种多用户信息处理方法及装置,所述方法包括:将用户信息分为i组,每组包含n个用户的用户信息,所述i为正整数,所述n为正整数且n≥2,分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号;采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,所述K为正整数。所述装置包括混合模块和扩展模块。采用本发明实施例方法和装置,系统获得分集增益,终端获得更好的SIC鲁棒性;此外系统可以全带宽调度,简单方便。

Description

一种多用户信息处理方法及装置 技术领域
本文涉及多用户信息处理技术领域,尤指一种多用户信息处理方法及装置。
背景技术
设计一个多用户无线通信方案,需要充分考虑无线信道的传播特性和信号之间的干扰,这是获得高系统性能的最重要因素。比如在多用户同步CDMA(码分多址)系统中,各个用户信息通过扩频码扩频区分开来,先用长度为K的扩展序列对各个数字调制后的数据符号进行扩展,每个已调制的数据符号会被扩展成K长的符号序列,然后,所有被扩展后符号序列可以在相同的时频资源上发送。扩展序列长度越长,扩展序列之间的低相关度越容易保证,如IS-95采用64位的Walsh(沃尔什序列)码,CDMA2000采用更长的扩频码,来获得更大的系统容量。最后,CDMA接收机收到的是所有扩展信号叠加在一起的合信号,把来自其它用户的干扰当成加性噪声,用自己的扩展序列通过多用户检测技术从合信号中分离出自己的信息。当用户数量超过100%负载时,其性能急剧下降。
类似于同步CDMA这种正交复用方式,多用户信息还可以通过FDM(频分复用),OFDM(正交频分复用)等复用方法广播。这里广播指的是发射机将不同用户信息的调制符号叠加起来后,同时发送给多个接收机,不同用户从接收到的合成信号中提取自己的信息。而有另外一种是非正交的复用方式,NOMA(非正交多址接入)技术可以满足更大的系统吞吐量。NOMA技术是在发送侧采用叠加编码,在接收侧采用干扰消除。其中“叠加编码”是将多个UE(用户设备或称终端)的调制符号在功率域直接叠加。UE收到的是各个用户符号叠加在一起的叠加符号,解调时各用户信息之间是相互干扰的,通常接收端要做串行干扰消除(Successive Interference Cancellation,SIC)分离信息。
经典文献已证明,采用非正交多址复用结合码块级SIC技术可以达到多 用户信息容量极限。但由于码块级SIC会引起很高的实现复杂度、功耗和时延,这些对终端来说有时是不可接受的,所以终端迫切需要简单的符号级SIC(不用重构用户符号,实现简单但性能有损),如果是AWGN(Additive White Gaussian Noise,加性高斯白色噪声)信道,终端解调时做符号级SIC也基本可以保证性能。
在实际移动衰落信道下,当发送符号处于深衰信道处时,这些经过深衰后的单个符号被接收端译错的可能性很大,经过深衰后的叠加符号做符号级SIC也会有很大的误差传播风险,从而导致接入性能下降。如果采用很好的窄带调度方案克服这一缺点,又会使得窄带调度的开销很大。
发明内容
本发明要解决的技术问题是提供一种多用户信息处理方法及装置,提高系统性能。
为了解决上述技术问题,采用如下技术方案:
一种多用户信息处理方法,包括:
将用户信息分为i组,每组包含n个用户的用户信息,其中,所述i为正整数,所述n为正整数,且n≥2;
分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号;
采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,其中,所述K为正整数。
可选地,所述方法还包括:将所述得到i个K长的符号序列形成发射信号,发送给i组中多个用户。
可选地,所述方法还包括:合并所述i个K长的符号序列,得到合并后的符号序列。
可选地,所述方法还包括:将所述合并后的符号序列形成发射信号,发送给多个用户。
可选地,所述分别对i组中的n个用户的用户信息进行混合处理的步骤 包括:
将每组中的n个用户的用户信息经过调制后进行混合;或者
将每组中的n个用户的用户信息在调制前进行混合;或者
将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合。
可选地,所述将每组中的n个用户的用户信息经过调制后进行混合的步骤包括:
将每组中的n个用户的用户信息经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加。
可选地,所述将每组中的n个用户的用户信息在调制前进行混合的步骤包括:
将每组中的n个用户的用户信息在调制前通过比特组合的方式进行混合。
可选地,所述将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合的步骤包括:
将每组中n个用户的部分比特信息的进行逻辑运算后,经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加,相加后得到的混合符号的所有可能星座点组成的星座图具有格雷映射属性。
可选地,所述将每组中n个用户的部分比特信息的进行逻辑运算的步骤包括:
n=2时,将每组中第一用户的比特信息与第二用户的部分比特信息进行异或运算,运算结果作为新的第二用户比特信息的一部分,未进行逻辑运算的第二用户的部分比特信息作为新的第二用户比特信息的另一部分。
可选地,所述i个K长的序列满足以下条件中的一种或多种:
所述i个K长的序列包括实数序列和/或复数序列;
所述i个K长的序列相同或不同;
所述i个K长的序列互为正交序列或非正交序列。
可选地,所述将所述得到i个K长的符号序列形成发射信号的步骤包括:
将所述i个K长的符号序列映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源,或者,多个不同时域资源对应的同一频域资源,或者,多个不同时域资源对应的多个频域资源。
可选地,所述时频资源包括同一时域资源对应的多个频域资源时,将所述i个K长的符号序列在频域上连续带宽放置,或分散于整个频带放置。
一种多用户信息处理装置,包括混合模块和扩展模块,其中:
所述混合模块设置成:将用户信息分为i组,每组包含n个用户的用户信息,分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号,其中,所述i为正整数,所述n为正整数,且n≥2,;
所述扩展模块设置成:采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,其中,所述K为正整数。
可选地,所述装置还包括发送模块,其中
所述发送模块设置成:将所述得到i个K长的符号序列形成发射信号,发送给i组中的多个用户。
可选地,所述装置还包括合并模块,用于合并所述i个K长的符号序列,得到合并后的符号序列。
可选地,所述装置还包括发送模块,用于将所述合并后的符号序列形成发射信号,发送给多个用户。
可选地,所述混合模块设置成按照如下方式分别对i组中的n个用户的用户信息进行混合处理:
所述混合模块将每组中的n个用户的用户信息经过调制后进行混合;或者
所述混合模块将每组中的n个用户的用户信息在调制前进行混合;或者
所述混合模块将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合。
可选地,所述混合模块设置成按照如下方式将每组中的n个用户的用户信息经过调制后进行混合:
所述混合模块将每组中的n个用户的用户信息经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加。
可选地,所述混合模块设置成按照如下方式将每组中的n个用户的用户信息在调制前进行混合:
所述混合模块将每组中的n个用户的用户信息在调制前通过比特组合的方式进行混合。
可选地,所述混合模块设置成按照如下方式将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合:
所述混合模块将每组中n个用户的部分比特信息的进行逻辑运算后,经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加,相加后得到的混合符号的所有可能星座点组成的星座图具有格雷映射属性。
可选地,所述混合模块设置成按照如下方式将每组中n个用户的部分比特信息的进行逻辑运算:
n=2时,所述混合模块将每组中第一用户的比特信息与第二用户的部分比特信息进行异或运算,运算结果作为新的第二用户比特信息的一部分,未进行逻辑运算的第二用户的部分比特信息作为新的第二用户比特信息的另一部分。
可选地,所述i个K长的序列满足以下条件中的一种或多种:
所述i个K长的序列包括实数序列和/或复数序列;
所述i个K长的序列相同或不同;
所述i个K长的序列互为正交序列或非正交序列。
可选地,所述发送模块设置成按照如下方式将所述得到i个K长的符号序列形成发射信号:
所述发送模块将所述i个K长的符号序列映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源,或者,多个不同时域资源对应 的同一频域资源,或者,多个不同时域资源对应的多个频域资源。
可选地,所述时频资源包括同一时域资源对应的多个频域资源时,所述发送模块将所述i个K长的符号序列在频域上连续带宽放置,或分散于整个频带放置。
本发明实施例通过对混合符号扩展获得时频域分集增益,以至少解决混合符号在下行发送时,在实际衰落信道下,经过深衰后的单个符号被接收端译错的可能性很大,经过深衰后的和符号做符号级SIC也会有很大的误差传播风险,从而导致接入性能下降这一问题。综上,本发明实施例的优点包括:系统获得分集增益,终端获得更好的SIC鲁棒性;系统可以全带宽调度,简单方便。
本发明的其它特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图概述
附图用来提供对本发明技术方案的进一步理解,并且构成说明书的一部分,与本申请的实施例一起用于解释本发明的技术方案,并不构成对本发明技术方案的限制。
图1为本发明实施例1流程图;
图2为本发明实施例2装置结构示意图;
图3为应用实例1多用户信息在发射机的处理过程图;
图4为应用实例1QPSK符号和16QAM符号直接叠加的示意图;
图5为应用实例1混合符号的扩频过程图;
图6为应用实例2多用户信息在发射机的处理过程图;
图7为应用实例2比特信息组合图;
图8为应用实例3多用户信息在发射机的处理过程。
本发明的较佳实施方式
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
下文中将参考附图并结合实施例来详细说明本发明。需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。并且,在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行,并且,虽然在流程图中示出了逻辑顺序,但是在某些情况下,可以以不同于此处的顺序执行所示出或描述的步骤。
实施例1
本实施例描述一种多用户信息处理方法,如图1所示,包括:
步骤110,将用户信息分为i组,每组包含n个用户的用户信息,所述i为正整数(即i≥1),所述n为正整数且n≥2,分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号;
可选地,上述分别对i组中的n个用户的用户信息进行混合处理,可以采用以下方式之一:
方式一,将每组中的n个用户的用户信息经过调制后进行混合;
具体地,将每组中的n个用户的用户信息经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加。
方式二,将每组中的n个用户的用户信息在调制前进行混合;
具体地,将每组中的n个用户的用户信息在调制前通过比特组合的方式进行混合。相加后得到的混合符号的所有可能星座点组成的星座图具有格雷映射属性。
方式三,将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合。
具体地,将每组中n个用户的部分比特信息的进行逻辑运算后,经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加,相加后得到的混合符号的所有可能星座点组成的星座图具有格雷映射属性。
例如,当n=2时,将每组中第一用户的比特信息与第二用户的部分比特信息进行异或运算,运算结果作为新的第二用户比特信息的一部分,未进行逻辑运算的第二用户的部分比特信息作为新的第二用户比特信息的另一部分。
经本步骤后得到的混合符号包含多个用户的信息,其他用户信息相对本用户信息而言为干扰信息。
步骤120,采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,所述K为正整数。
可选地,所述i个K长序列满足以下条件中的一种或多种:所述i个K长序列包括实数序列和/或复数序列;所述i个K长序列相同或不同;所述i个K长序列互为正交序列或非正交序列。其中i=K或者i≠K。
混合符号被K长序列扩展后,得到的扩展后的符号是个K长符号序列,多个用户的信息均被扩展到K个符号中。
在一个实施例中,当i=1时,即只有一组时,上述方法还包括
步骤130:将所述得到i个K长的符号序列形成发射信号,发送给i组中多个用户。
在另一个实施例中,当i>1时,即有两组以上时,所述方法还包括:
步骤130’,合并所述i个K长的符号序列,得到合并后的符号序列;
在需要发射时,还可以包括:步骤140,将所述合并后的符号序列形成发射信号,发送给多个用户。
上述发射步骤(步骤130或步骤140)中,是将所述符号序列映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源,或者,多个不同时域资源对应的同一频域资源,或者,多个不同时域资源对应的多个频域资源。当所述时频资源包括同一时域资源对应的多个频域资源时,可以将所述符号序列在频域上连续带宽放置,或分散于整个频带放置。即多个用户的信息可以被放在较宽的时域资源或较宽的频域资源里发送。
本发明实施例提供的混合符号扩展发送方法中,混合符号被K长的序列做扩展,得到扩展后的符号,扩展后的符号被合并后,得到合并后的符号, 合并后的符号被形成发射信号。采用本发明实施例,系统可获得分集增益,终端获得更好的SIC鲁棒性,另外系统可以全带宽调度,简单方便。
实施例2
本实施例描述实现上述实施例1方法的一种多用户信息处理装置,如图2所示,包括混合模块201和扩展模块202,其中:
所述混合模块201,设置成:将用户信息分为i组,每组包含n个用户的用户信息,所述i为正整数,所述n为正整数且n≥2,分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号;
所述扩展模块202,设置成:采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,所述K为正整数。
当只有1组时,在一个实施例中,所述装置还包括发送模块,设置成:将所述得到i个K长的符号序列形成发射信号,发送给i组中多个用户。
当有2组以上时,在另一个实施例中,所述装置还包括合并模块,设置成:合并所述i个K长的符号序列,得到合并后的符号序列。
可选地,所述装置还包括发送模块,设置成:将所述合并后的符号序列形成发射信号,发送给多个用户。
上述混合模块201分别对i组中的n个用户的用户信息进行混合处理,可采用以下方式之一:
所述混合模块201将每组中的n个用户的用户信息经过调制后进行混合;
所述混合模块201将每组中的n个用户的用户信息在调制前进行混合;
所述混合模块201将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合。
具体如何混合参见实施例1中描述。
上述发送模块将符号序列形成发射信号,包括:所述发送模块将所述符号序列映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源,或者,多个不同时域资源对应的同一频域资源,或者,多个不同时域 资源对应的多个频域资源。可选地,当所述时频资源包括同一时域资源对应的多个频域资源时,所述发送模块将所述符号序列在频域上连续带宽放置,或分散于整个频带放置。
为强调本发明中的特性,下面优选典型应用实例对本发明实施例做进一步说明。本文实例中不同组内的UE单独编号,例如图3中第一组中UE1和第四组中UE1为不同的UE,第一组中UE2和第四组中UE2也为不同的UE。
应用实例1
采用4个序列分别对4个混合符号做扩展,得到4组扩展后的符号,合并4组扩展后的符号得到合并后的符号,发射机把所述合并后的符号形成发射信号,发送给个接收机。如图3所示是多用户信息在发射机的处理过程。
如图3所示,将每个组内所有用户信息编码调制,并分配一定功率,生成具有一定功率的用户调制符号,经过混合后得到混合符号,将混合符号扩展后得到扩展后的符号,将扩展后的符号合并后得到合并后的符号,将合并后的符号形成发射信号发送。每个组包括两个或两个以上的用户信息,本例仅以一组包括两个用户信息为例进行说明。组数可以是一个或一个以上,本例以组数为4为例进行说明。包括以下步骤:
步骤1,第一组的UE1比特信息经过编码、调制、并分配一定功率后,得到具有一定功率的用户调制符号S11。第一组的UE2比特信息经过编码、调制、并分配一定功率后,得到具有一定功率的用户调制符号S12。
步骤2,S11和S12混合后得到混合符号。S11和S12混合可以直接由两个符号相加得到,表示为S11+S12。如图4所示是一个QPSK(正交相移键控)符号和一个16QAM(正交幅度调制)符号直接相加的示意图。图中黑色所示数据是随机取两种具体情况例子加以说明,第一种:“01”处的QPSK符号和“1111”处的16QAM符号直接相加,得到“011111”处的符号。第二种:“11”处的QPSK符号和“0111”处的16QAM符号直接相加,得到“110111”处的符号。
步骤3,对混合符号进行扩展,扩展可以是直接序列扩频,也可以是跳频扩频,此外,还可以是时域上的扩展。
直接序列扩展可以采用如下方式实现:4个混合符号均得到以后,4组混合符号使用的扩展序列来自预设的4×4的扩展序列集合中的4个4长的序列,这里4长序列是指这个序列由4个符号构成,该扩展序列集合例如可以是一个4×4的哈德玛矩阵,其中的1行或者一列可以作为一个序列,每个序列长度为4。每组使用其中的1个4长的扩展序列,每个扩展序列均不一样。
采用扩展序列对混合符号进行扩展的目的是为了使得扩展后的符号可以更广泛的洒在时频资源上。扩展序列的长度K没有要求。扩展序列可以是实数序列也可以是复数序列,扩展序列集合中i个序列可以是相同的也可以是不同的,如果扩展序列集合中的i个序列是不同的,该i个序列可以互为正交序列或非正交序列。
扩展序列可以将一个调制符号扩展成一个4长的符号序列。如图5所示,每组混合符号用一条序列进行扩展处理,生成扩展后的符号序列。例如,一条扩展序列{C11,C12,C13,C14}将一组混合符号{SH1}扩展,混合符号和一个4长的扩展序列相乘,即{C11,C12,C13,C14}*{SH1},得到另一个4长的扩展后的符号序列{C11*SH1,C12*SH1,C13*SH1,C14*SH1}。混合符号被扩展后,这个混合符号的信息或功率被分到4个符号中,或者说,混合符号承载在一条4长的扩展序列上。
4组混合符号均被扩展,得到扩展后的符号,一条扩展序列{C21,C22,C23,C24}将一组混合符号{SH2}扩展,混合符号和一个4长的扩展序列相乘,即{C21,C22,C23,C24}*{SH2},得到另一个4长的扩展后的符号序列{C21*SH2,C22*SH2,C23*SH2,C24*SH2};一条扩展序列{C31,C32,C33,C34}将一组混合符号{SH3}扩展,混合符号和一个4长的扩展序列相乘,即{C31,C32,C33,C34}*{SH3},得到另一个4长的扩展后的符号序列{C31*SH3,C32*SH3,C33*SH3,C34*SH3};一条扩展序列{C41,C42,C43,C44}将一组混合符号{SH4}扩展,混合符号和一个4长的扩展序列相乘,即{C41,C42,C43,C44}*{SH4},得到另一个4长的扩展后的符号序列{C41*SH4,C42*SH4,C43*SH4,C44*SH4}。
步骤4,合并扩展后的符号序列,得到合并后的符号序列。所述合并包括将4组扩展后的符号序列对应相加,即所述合并后的符号包含4组混合符 号的信息,可表示为{C11*SH1+C21*SH2+C31*SH3+C41*SH4,C12*SH1+C22*SH2+C32*SH3+C42*SH4,C13*SH1+C23*SH2+C33*SH3+C43*SH4,C14*SH1+C24*SH2+C34*SH3+C44*SH4}。
步骤5,最后发射机(如基站)将合并后的符号序列形成发射信号,发给多个UE。把合并后的符号映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源(例如同一时刻的多个频点),或者多个不同时域资源对应的同一频域资源(例如多个时刻的同一频点),或者多个不同时域资源对应的多个频域资源(例如多个时刻的多个频点)。如果是同一时域资源对应的多个频域资源,则合并后的符号在频域上可以连续带宽放置,也可以分散于整个频带放置。当4组混合符号的信息在相同的时频资源上发送时,如果用于直接序列扩频的扩频序列集合中的i个序列互为正交序列将会获得较好的效果。
应用实例2
采用4个序列分别对4个混合符号做扩展,得到4组扩展后的符号,合并4组扩展后的符号得到合并后的符号,发射机把所述合并后的符号形成发射信号,发送给个接收机。如图6所示是多用户信息在发射机的处理过程。
如图6所示,将每个组内所有用户信息编码后得到码字比特,将组内所有用户的比特信息组合后,分配一定功率并调制得到混合符号,将混合符号扩展后得到扩展后的符号,将扩展后的符号合并后得到合并后的符号,将合并后的符号形成发射信号发送。每个组包括两个或两个以上的用户信息,本例仅以一组包括两个用户信息为例进行说明。组数可以是一个或一个以上,本例以组数为4为例进行说明。包括以下步骤:
步骤1,第一组的UE1比特信息经过编码后得到码字比特b5b4,第一组的UE2比特信息经过编码后得到码字比特b3b2b1b0,将两用户的比特信息组合,或者说两个用户比特信息合并一起,组合成一组比特b5b4b3b2b1b0。分配一定功率并调制,得到混合符号。本例中的混合符号为多用户比特信息组合后的调制符号。本例中UE1的码字比特与UE2的码字比特位数仅为举例。
与应用实例1不同的是,组内用户的信息不是通过调制符号直接相加混合在一起,而是通过比特组合的方式混合在一起。以两组比特组合为例,可以将一组置为高位比特,另一组置为低位比特,例如将两比特的UE1码字比特和4比特的UE2码字比特组合后变成一组6比特,其中UE1的码字比特为高位比特,UE2的码字比特为低位比特。
如图7所示是一组两比特和一组4比特组合并调制的示意图。图中黑色所示数据是随机取两种具体情况例子加以说明,第一种:UE1比特信息“01”和UE2比特信息“0111”合并,得到一组比特“010111”;第二种:UE1比特信息“11”和UE2比特信息“0111”合并,得到一组比特“110111”。分别将比特组“010111”和比特组“110111”映射调制到星座图上,以此类推,混合符号的所有可能星座点组成的星座图是具有格雷映射属性的。
步骤2,对混合符号进行扩展,本例中以采用直接序列扩展为例进行说明。4组混合符号均得到以后,4组混合符号使用的扩展序列来自预设的4×4的扩展序列集合中的4个4长的序列,这里4长序列是指这个序列由4个符号构成,该扩展序列集合例如可以是一个4×4的哈德玛矩阵,其中的1行或者一列可以作为一个序列,每个序列长度为4。每组使用其中的1个4长的扩展序列,每个扩展序列均不一样。
扩展序列的长度K没有要求。扩展序列可以是实数序列也可以是复数序列,扩展序列集合中i个序列可以是相同的也可以是不同的,如果扩展序列集合中的i个序列是不同的,该i个序列可以互为正交序列或非正交序列。
扩展序列可以将一个调制符号扩展成一个4长的符号序列。每组混合符号用一条序列进行扩展处理,生成扩展后的符号序列。例如,一条扩展序列{C11,C12,C13,C14}将一组混合符号{SH1}扩展,混合符号和一个4长的扩展序列相乘,即{C11,C12,C13,C14}*{SH1},得到另一个4长的扩展后的符号序列{C11*SH1,C12*SH1,C13*SH1,C14*SH1}。混合符号被扩展后,这个混合符号的信息或功率被分到4个符号中,或者说,混合符号承载在一条4长的扩展序列上。
4组混合符号均被扩展,得到扩展后的符号,一条扩展序列{C21,C22,C23,C24}将一组混合符号{SH2}扩展,混合符号和一个4长的扩展序列相乘, 即{C21,C22,C23,C24}*{SH2},得到另一个4长的扩展后的符号序列{C21*SH2,C22*SH2,C23*SH2,C24*SH2};一条扩展序列{C31,C32,C33,C34}将一组混合符号{SH3}扩展,混合符号和一个4长的扩展序列相乘,即{C31,C32,C33,C34}*{SH3},得到另一个4长的扩展后的符号序列{C31*SH3,C32*SH3,C33*SH3,C34*SH3};一条扩展序列{C41,C42,C43,C44}将一组混合符号{SH4}扩展,混合符号和一个4长的扩展序列相乘,即{C41,C42,C43,C44}*{SH4},得到另一个4长的扩展后的符号序列{C41*SH4,C42*SH4,C43*SH4,C44*SH4}。
步骤3,合并扩展后的符号序列,得到合并后的符号序列。所述合并包括将4组扩展后的符号序列对应相加,即所述合并后的符号包含4组混合符号的信息,可表示为{C11*SH1+C21*SH2+C31*SH3+C41*SH4,C12*SH1+C22*SH2+C32*SH3+C42*SH4,C13*SH1+C23*SH2+C33*SH3+C43*SH4,C14*SH1+C24*SH2+C34*SH3+C44*SH4}。
步骤4,最后发射机将合并后的符号序列形成发射信号,发给多个UE。把合并后的符号映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源(例如同一时刻的多个频点),或者多个不同时域资源对应的同一频域资源(例如多个时刻的同一频点),或者多个不同时域资源对应的多个频域资源(例如多个时刻的多个频点)。如果是同一时域资源对应的多个频域资源,则合并后的符号在频域上可以连续带宽放置,也可以分散于整个频带放置。当4组混合符号的信息在相同的时频资源上发送时,如果用于直接序列扩频的扩频序列集合中的i个序列互为正交序列将会获得较好的效果。
应用实例3
采用4个序列分别对4个混合符号做扩展,得到4组扩展后的符号,合并4个组扩展后的符号得到合并后的符号,发射机把所述合并后的符号形成发射信号,发送给个接收机。如图8所示是多用户信息在发射机的处理过程。
如图8所示,将每个组内所有用户信息编码后得到码字比特,码字比特在调制前先进行比特异或运算,分配一定功率并调制得到混合符号,将混合 符号扩展后得到扩展后的符号,将扩展后的符号合并后得到合并后的符号,将合并后的符号形成发射信号发送。每个组包括两个或两个以上的用户信息,本例仅以一组包括两个用户信息为例进行说明。组数可以是一个或一个以上,本例以组数为4为例进行说明。包括以下步骤:
步骤1,第一组的UE1比特信息经过编码后得到码字比特b5b4,第一组的UE2比特信息经过编码后得到码字比特b3b2b1b0,b5b4直接被调制得到有一定功率的调制符号,而b3b2b1b0先与第一组信息比特经过比特运算得到新的信息比特B3B2B1B0后再被调制得到有一定功率的调制符号,调制可以按照相关标准采用的调制方法,例如:BPSK、QPSK、QAM。
其中新的信息比特由两部分组成,一部分由b3b2b1b0中特定的2个比特与b5b4两者运算得到,另一部分由除上述特定比特之外的比特保持不变得到。即新的信息比特B3B2B1B0的前两位B3B2是第一组信息码字比特的前两位b5b4和第二组信息码字比特中特定的2个比特b3b2异或得到,而后两位由b3b2b1b0中除上述特定比特之外的比特b1b0保持不变得到。除此种逻辑运算获得新用户信息的方式外,还可以采用其他逻辑运算方式,只要获得的混合符号的所有可能星座点组成的星座图具有格雷映射属性即可。
与应用实例1不同的是,组内用户的信息不是通过调制符号直接相加混合在一起,而是通过比特运算,修正UE2的比特信息后,再调制相加的方式混合在一起。通过这种简单处理可以达到与应用实例2中混合符号类似的很好特性,即所有可能星座点组成的星座图是具有格雷映射属性的。
步骤2,对混合符号进行扩展,本例中以采用直接序列扩展为例进行说明。4组混合符号均得到以后,4组混合符号使用的扩展序列来自预设的4×4的扩展序列集合中的4个4长的序列,这里4长序列是指这个序列由4个符号构成,该扩展序列集合例如可以是一个4×4的哈德玛矩阵,其中的1行或者一列可以作为一个序列,每个序列长度为4。每组使用其中的1条4长的扩展序列,每条扩展序列均不一样。
扩展序列的长度K没有要求。扩展序列可以是实数序列也可以是复数序列,扩展序列集合中i个序列可以是相同的也可以是不同的,如果扩展序列集合中的i个序列是不同的,该i个序列可以互为正交序列或非正交序列。
扩展序列可以将一个调制符号扩展成一个4长的符号序列。每组混合符号用一条序列进行扩展处理,生成扩展后的符号序列。例如,一条扩展序列{C11,C12,C13,C14}将一组混合符号{SH1}扩展,混合符号和一个4长的扩展序列相乘,即{C11,C12,C13,C14}*{SH1},得到另一个4长的扩展后的符号序列{C11*SH1,C12*SH1,C13*SH1,C14*SH1}。混合符号被扩展后,这个混合符号的信息或功率被分到4个符号中,或者说,混合符号承载在一条4长的扩展序列上。
4组混合符号均被扩展,得到扩展后的符号,一条扩展序列{C21,C22,C23,C24}将一组混合符号{SH2}扩展,混合符号和一个4长的扩展序列相乘,即{C21,C22,C23,C24}*{SH2},得到另一个4长的扩展后的符号序列{C21*SH2,C22*SH2,C23*SH2,C24*SH2};一条扩展序列{C31,C32,C33,C34}将一组混合符号{SH3}扩展,混合符号和一个4长的扩展序列相乘,即{C31,C32,C33,C34}*{SH3},得到另一个4长的扩展后的符号序列{C31*SH3,C32*SH3,C33*SH3,C34*SH3};一条扩展序列{C41,C42,C43,C44}将一组混合符号{SH4}扩展,混合符号和一个4长的扩展序列相乘,即{C41,C42,C43,C44}*{SH4},得到另一个4长的扩展后的符号序列{C41*SH4,C42*SH4,C43*SH4,C44*SH4}。
步骤3,合并扩展后的符号序列,得到合并后的符号序列。所述合并包括4组扩展后的符号序列对应相加,即所述合并后的符号包含4组混合符号的信息,可表示为{C11*SH1+C21*SH2+C31*SH3+C41*SH4,C12*SH1+C22*SH2+C32*SH3+C42*SH4,C13*SH1+C23*SH2+C33*SH3+C43*SH4,C14*SH1+C24*SH2+C34*SH3+C44*SH4}。
步骤4,最后发射机将合并后的符号序列形成发射信号,发给多个UE。把合并后的符号映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源(例如同一时刻的多个频点),或者多个不同时域资源对应的同一频域资源(例如多个时刻的同一频点),或者多个不同时域资源对应的多个频域资源(例如多个时刻的多个频点)。如果是同一时域资源对应的多个频域资源,则合并后的符号在频域上可以连续带宽放置,也可以分散于整个频带放置。当4组混合符号的信息在相同的时频资源上发送时,如果用于 直接序列扩频的扩频序列集合中的i个序列互为正交序列将会获得较好的效果。
本发明实施例还公开了一种计算机程序,包括程序指令,当该程序指令被发射机执行时,使得该发射机可执行上述任意的多用户信息处理方法。
本发明实施例还公开了一种载有所述的计算机程序的载体。
在阅读并理解了附图和详细描述后,可以明白其他方面。
本领域普通技术人员可以理解上述实施例的全部或部分步骤可以使用计算机程序流程来实现,所述计算机程序可以存储于一计算机可读存储介质中,所述计算机程序在相应的硬件平台上(如系统、设备、装置、器件等)执行,在执行时,包括方法实施例的步骤之一或其组合。
可选地,上述实施例的全部或部分步骤也可以使用集成电路来实现,这些步骤可以被分别制作成一个个集成电路模块,或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样,本发明不限制于任何特定的硬件和软件结合。
上述实施例中的各装置/功能模块/功能单元可以采用通用的计算装置来实现,它们可以集中在单个的计算装置上,也可以分布在多个计算装置所组成的网络上。
上述实施例中的各装置/功能模块/功能单元以软件功能模块的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。上述提到的计算机可读取存储介质可以是只读存储器,磁盘或光盘等。
任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以权利要求所述的保护范围为准。
工业实用性
本发明实施例通过对混合符号扩展获得时频域分集增益,以至少解决混合符号在下行发送时,在实际衰落信道下,经过深衰后的单个符号被接收端 译错的可能性很大,经过深衰后的和符号做符号级SIC也会有很大的误差传播风险,从而导致接入性能下降这一问题。综上,本发明实施例的优点包括:系统获得分集增益,终端获得更好的SIC鲁棒性;系统可以全带宽调度,简单方便。因此本发明具有很强的工业实用性。

Claims (20)

  1. 一种多用户信息处理方法,包括:
    将用户信息分为i组,每组包含n个用户的用户信息,其中,所述i为正整数,所述n为正整数,且n≥2;
    分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号;
    采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,其中,所述K为正整数。
  2. 根据权利要求1所述的多用户信息处理方法,所述方法还包括:将所述得到i个K长的符号序列形成发射信号,发送给i组中多个用户。
  3. 根据权利要求1或2所述的多用户信息处理方法,其中,所述分别对i组中的n个用户的用户信息进行混合处理的步骤包括:
    将每组中的n个用户的用户信息经过调制后进行混合;或者
    将每组中的n个用户的用户信息在调制前进行混合;或者
    将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合。
  4. 根据权利要求3所述的多用户信息处理方法,其中,所述将每组中的n个用户的用户信息经过调制后进行混合的步骤包括:
    将每组中的n个用户的用户信息经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加。
  5. 根据权利要求3所述的多用户信息处理方法,其中,所述将每组中的n个用户的用户信息在调制前进行混合的步骤包括:
    将每组中的n个用户的用户信息在调制前通过比特组合的方式进行混合。
  6. 根据权利要求3所述的多用户信息处理方法,其中,所述将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合的步骤包括:
    将每组中n个用户的部分比特信息的进行逻辑运算后,经过调制得到n 个用户调制符号,将所述n个用户调制符号进行相加,相加后得到的混合符号的所有可能星座点组成的星座图具有格雷映射属性。
  7. 根据权利要求6所述的多用户信息处理方法,其中,所述将每组中n个用户的部分比特信息的进行逻辑运算的步骤包括:
    n=2时,将每组中第一用户的比特信息与第二用户的部分比特信息进行异或运算,运算结果作为新的第二用户比特信息的一部分,未进行逻辑运算的第二用户的部分比特信息作为新的第二用户比特信息的另一部分。
  8. 根据权利要求1-2,4-7中任一权利要求所述的多用户信息处理方法,其中,所述i个K长的序列满足以下条件中的一种或多种:
    所述i个K长的序列包括实数序列和/或复数序列;
    所述i个K长的序列相同或不同;
    所述i个K长的序列互为正交序列或非正交序列。
  9. 根据权利要求2所述的多用户信息处理方法,其中,所述将所述得到i个K长的符号序列形成发射信号的步骤包括:
    将所述i个K长的符号序列映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源,或者,多个不同时域资源对应的同一频域资源,或者,多个不同时域资源对应的多个频域资源。
  10. 根据权利要求9所述的多用户信息处理方法,其中,所述时频资源包括同一时域资源对应的多个频域资源时,将所述i个K长的符号序列在频域上连续带宽放置,或分散于整个频带放置。
  11. 一种多用户信息处理装置,包括混合模块和扩展模块,其中:
    所述混合模块设置成:将用户信息分为i组,每组包含n个用户的用户信息,分别对i组中的n个用户的用户信息进行混合处理,得到i个混合符号,其中,所述i为正整数,所述n为正整数,且n≥2,;
    所述扩展模块设置成:采用i个K长的序列分别对所述i个混合符号做扩展,得到i个K长的符号序列,其中,所述K为正整数。
  12. 根据权利要求11所述的多用户信息处理装置,所述装置还包括发送 模块,其中
    所述发送模块设置成:将所述得到i个K长的符号序列形成发射信号,发送给i组中的多个用户。
  13. 根据权利要求11或12所述的多用户信息处理装置,其中,所述混合模块设置成按照如下方式分别对i组中的n个用户的用户信息进行混合处理:
    所述混合模块将每组中的n个用户的用户信息经过调制后进行混合;或者
    所述混合模块将每组中的n个用户的用户信息在调制前进行混合;或者
    所述混合模块将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合。
  14. 根据权利要求13所述的多用户信息处理装置,其中,所述混合模块设置成按照如下方式将每组中的n个用户的用户信息经过调制后进行混合:
    所述混合模块将每组中的n个用户的用户信息经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加。
  15. 根据权利要求13所述的多用户信息处理装置,其中,所述混合模块设置成按照如下方式将每组中的n个用户的用户信息在调制前进行混合:
    所述混合模块将每组中的n个用户的用户信息在调制前通过比特组合的方式进行混合。
  16. 根据权利要求13所述的多用户信息处理装置,其中,所述混合模块设置成按照如下方式将每组中的n个用户的用户信息在调制前进行逻辑运算,调制后再进行混合:
    所述混合模块将每组中n个用户的部分比特信息的进行逻辑运算后,经过调制得到n个用户调制符号,将所述n个用户调制符号进行相加,相加后得到的混合符号的所有可能星座点组成的星座图具有格雷映射属性。
  17. 根据权利要求16所述的多用户信息处理装置,其中,所述混合模块设置成按照如下方式将每组中n个用户的部分比特信息的进行逻辑运算:
    n=2时,所述混合模块将每组中第一用户的比特信息与第二用户的部分比特信息进行异或运算,运算结果作为新的第二用户比特信息的一部分,未进行逻辑运算的第二用户的部分比特信息作为新的第二用户比特信息的另一部分。
  18. 根据权利要求11-12,14-17中任一权利要求所述的多用户信息处理装置,其中,所述i个K长的序列满足以下条件中的一种或多种:
    所述i个K长的序列包括实数序列和/或复数序列;
    所述i个K长的序列相同或不同;
    所述i个K长的序列互为正交序列或非正交序列。
  19. 根据权利要求12所述的多用户信息处理装置,其中,所述发送模块设置成按照如下方式将所述得到i个K长的符号序列形成发射信号:
    所述发送模块将所述i个K长的符号序列映射到时频资源上,所述时频资源包括同一时域资源对应的多个频域资源,或者,多个不同时域资源对应的同一频域资源,或者,多个不同时域资源对应的多个频域资源。
  20. 根据权利要求19所述的多用户信息处理装置,其中,所述时频资源包括同一时域资源对应的多个频域资源时,所述发送模块将所述i个K长的符号序列在频域上连续带宽放置,或分散于整个频带放置。
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