CN106656413B - Broadcast channel data transmitting and receiving method - Google Patents
Broadcast channel data transmitting and receiving method Download PDFInfo
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- CN106656413B CN106656413B CN201610690208.XA CN201610690208A CN106656413B CN 106656413 B CN106656413 B CN 106656413B CN 201610690208 A CN201610690208 A CN 201610690208A CN 106656413 B CN106656413 B CN 106656413B
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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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
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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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
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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Abstract
The invention provides a broadcast channel data transmitting and receiving method executed by a multi-service transmission system compatible with single antenna receiving and multi-antenna receiving, which specifically comprises the following steps: grouping the physical layer symbol sequences according to the service quality requirement required by MISO service and MIMO service transmission and a multi-antenna constellation diagram used by a transmitting end, and dividing each physical layer symbol group at a bit level to obtain a MISO service sub-channel and an MIMO service sub-channel at the bit level; filling transmission data bits of the MISO service and the MIMO service into corresponding bit level sub-channels, mapping bit vectors filled with service data onto a constellation diagram, and transmitting through a baseband equivalent channel; and decoding the MISO service sub-channel in the received signal, decoding MISO service data bits from the MISO service sub-channel, and then decoding the MIMO service by using the decoded MISO service data bits as prior information by the MIMO receiver.
Description
Technical Field
The invention belongs to the technical field of digital information transmission, particularly relates to downlink multi-service transmission in a broadband wireless mobile system or a broadband ground broadcasting system, and particularly relates to a multi-service transmission method compatible with single-antenna reception and single-antenna and multi-antenna reception based on bit division multiplexing, a transmitting end and a receiving end device.
Background
In order to realize more efficient utilization of frequency resources, a multi-antenna technology, also called a Multiple-Input Multiple-Output (MIMO) technology, is widely adopted in a new generation of broadband wireless mobile system and broadband terrestrial broadcasting system. The MIMO system adopts a structure of a plurality of transmitting antennas and receiving antennas, so that space multiplexing gain and space diversity gain can be obtained, and the frequency spectrum efficiency and the link stability are improved. The Long Term Evolution (LTE) of the fourth Generation wireless mobile communication system and the DVB-T2 (2nd Generation Digital Video Broadcasting) of the second Generation of europe support the MIMO technology to improve the transmission performance.
In the process of the evolution of the broadband wireless mobile communication system and the broadband terrestrial broadcast transmission system from a single-antenna architecture to a multi-antenna architecture, a multi-antenna receiver in a communication network gradually replaces a single-antenna receiver. In this evolution, single and dual antenna receivers have been in existence in the network for a considerable period of time. Therefore, the compatibility of the single-antenna receiver with the multi-antenna receiver is a problem to be solved. If the sending end only sends the service for the single antenna receiver to receive the decoding, the performance gain which can be obtained by the multi-antenna receiver is very limited; on the other hand, if the transmitting end transmits only the traffic for the multi-antenna receiver to receive the decoding, the single-antenna receiver cannot normally correctly receive the traffic. Therefore, in order to effectively utilize system resources, it is necessary to design a multi-service system, in which signals transmitted by the multi-service system include both basic services that can be decoded by a single-antenna receiver and a multi-antenna receiver simultaneously, and additional services that can be received by only the multi-antenna receiver. In existing systems, such as the european Digital Video Broadcasting for Next Generation handheld reception (DVB-NGH), support for multiple antenna receivers is an optional mode, and compatible support for single antenna receivers and multiple antenna reception is implemented in the form of mode switching. That is, most of the existing systems adopt orthogonal multiplexing methods such as time division multiplexing and frequency division multiplexing to solve the problem of receiver compatibility of different receiving antenna structures.
The information theory principle indicates that the multi-service system compatible with single antenna reception and multi-antenna reception involved in the requirement is equivalent to a MIMO broadcast channel model. In the case that the system has Channel State Information (CSIT) at the transmitting end, the Channel capacity of the MIMO broadcast Channel can be realized by Dirty Paper Coding (DPC); when the system does not have CSIT, superposition coding may be used to approximate MIMO broadcast channel capacity. The information theory research shows that under the condition that the thresholds of the receiving signal-to-noise ratio of two services are the same, the capacity of the MIMO broadcast channel is equal to the capacity of time division multiplexing. However, in the case where the snr thresholds required for the two services are different, the MIMO broadcast channel capacity is larger than that in time division multiplexing. That is, simply using time division multiplexing to transmit different services that are suitable for reception by a single antenna receiver and a multiple antenna receiver results in a loss of capacity.
The bit-level physical layer sub-channel technology is a broadcast channel multi-service transmission technology. The main method of the technology is to divide the transmitted symbol stream in the equivalent baseband system into sub-channels at the bit level and transmit different services on different sub-channels. Since bits at different positions in a transmission constellation diagram of a transmitting end have different protection levels, the bit-level physical layer subchannel technology is a nonlinear allocation to channel resources. The bit-level physical layer subchannel technique may prove to have performance approaching the capacity of a broadcast channel.
However, the conventional bit-level physical layer subchannel technique considers only a single antenna transmission system. When applied to a MIMO system, especially when receivers compatible with different numbers of receiving antennas are required, the conventional bit-level physical layer subchannel technique does not consider the encoding and constellation mapping modes of different services between different antennas. There is a large performance penalty compared to the capacity of the MIMO broadcast channel.
Disclosure of Invention
In order to solve the problem of performance loss in MIMO transmission in the prior art, a multi-service transmission system compatible with single-antenna reception and multi-antenna reception with higher transmission efficiency is provided.
A broadcast channel data transmitting and receiving method, said method compatible with single antenna reception and multi-antenna reception broadcast channel multi-service transmission, and capable of simultaneously transmitting MISO service and MIMO service, comprising the steps of:
preparation of transmission data: channel error control coding and bit interleaving are independently performed on the data of the MISO service and the data of the MIMO service respectively to obtain transmission data bit streams of the MISO service and the MIMO service;
grouping: grouping the physical layer symbol sequences according to service quality requirements required by MISO service and MIMO service transmission and a multi-antenna constellation used by data transmitting equipment;
acquiring a service sub-channel: dividing each physical layer symbol group at a bit level to obtain a MISO service subchannel and an MIMO service subchannel at the bit level;
data padding and constellation mapping: filling transmission data bits of the MISO service and the MIMO service into corresponding bit level sub-channels, mapping bit vectors filled with service data onto a constellation diagram, and transmitting through a baseband equivalent channel;
and (3) data receiving and decoding: and decoding the MISO service sub-channel in the received signal, decoding MISO service data bits from the MISO service sub-channel, and then decoding the MIMO service by using the decoded MISO service data bits as prior information by the MIMO receiver.
A broadcast channel data transmission method, which is compatible with broadcast channel multi-service transmission of single antenna reception and multi-antenna reception and can simultaneously transmit MISO service and MIMO service, comprising the following steps:
preparation of transmission data: channel error control coding and bit interleaving are independently performed on the data of the MISO service and the data of the MIMO service respectively to obtain transmission data bit streams of the MISO service and the MIMO service;
grouping: grouping the physical layer symbol sequences according to service quality requirements required by MISO service and MIMO service transmission and a multi-antenna constellation used by data transmitting equipment;
acquiring a service sub-channel: dividing each physical layer symbol group at a bit level to obtain a MISO service subchannel and an MIMO service subchannel at the bit level;
data padding and constellation mapping: filling the transmission data bits of the MISO service and the MIMO service into corresponding bit level sub-channels, mapping the bit vectors filled with the service data onto a constellation diagram, and transmitting through a baseband equivalent channel.
A broadcast channel data receiving method compatible with broadcast channel multi-service transmission of single antenna reception and multi-antenna reception and capable of simultaneously transmitting MISO service and MIMO service, comprising the steps of:
and decoding the MISO service sub-channel in the received signal, decoding MISO service data bits from the MISO service sub-channel, and then decoding the MIMO service by using the decoded MISO service data bits as prior information by the MIMO receiver.
Compared with the prior art, the multi-service transmission system compatible with single-antenna receiving and multi-antenna receiving provided by the invention can be compatible with single-antenna receiving and multi-antenna receiving in a multi-antenna transmitting wireless mobile system or a broadband terrestrial broadcasting system, can provide differentiated multi-service transmission for receivers with different antenna numbers, and can support flexible system parameter configuration and flexible channel resource allocation. The invention adopts a bit division multiplexing mode to solve the division of the MISO service sub-channel and the MIMO service sub-channel, and can obtain the broadcast channel gain and improve the spectrum efficiency of system transmission compared with the traditional orthogonal channel resource allocation modes such as time division multiplexing, frequency division multiplexing and the like.
Drawings
Fig. 1 is a block diagram of an apparatus applied to a multi-service transmission system compatible with single antenna reception and multi-antenna reception according to a first embodiment of the present invention.
Fig. 2 is a flowchart of the operation of the multi-service transmission system compatible with single antenna reception and multi-antenna reception according to the first embodiment of the present invention.
Fig. 3 is a flow chart of the manner in which data bits of the MISO service are mapped to the MISO service subchannels as shown in fig. 2.
Fig. 4 is a schematic diagram of data bit stuffing and constellation mapping when MISO service does not use inter-antenna coding in the data stuffing manner shown in fig. 2.
Fig. 5 is a schematic diagram of data bit stuffing and constellation mapping when the MISO service in the data stuffing manner shown in fig. 2 adopts inter-antenna repetition coding.
Fig. 6 is a schematic diagram of data bit padding and constellation mapping when the MISO service uses space-time packet coding in the data padding mode shown in fig. 2.
Fig. 7 is a flow chart of decoding a received signal by the receiver of fig. 2.
Fig. 8 is a flowchart of the operation of the broadcast channel multi-service system 10 compatible with single antenna reception and multi-antenna reception according to the second embodiment of the present invention.
Fig. 9 is a bit-by-bit interleaving coding modulation graph of MISO service and MIMO service when MISO service does not adopt inter-antenna coding in data decoding shown in fig. 8.
Fig. 10 is a diagram of MISO service coding modulation when MISO service employs inter-antenna repetition coding and space-time coding in data decoding shown in fig. 8.
Fig. 11 is a flowchart of a broadcast channel multi-service system compatible with single antenna reception and multi-antenna reception according to a third embodiment of the present invention.
Fig. 12 is a curve of joint transmission rates of MIMO service and MISO service in data decoding shown in fig. 11.
Fig. 13 is a graph of the upper bound of the joint transmission rate performance of the MIMO service and the MISO service when the BICM iterative demapping is adopted in the data decoding as shown in fig. 12.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In a conventional system, to solve the compatibility problem of receivers with different numbers of receiving antennas, a method of orthogonal division of channel resources is usually adopted, that is, a time division multiplexing or frequency division multiplexing method is adopted to perform multi-service transmission. However, the joint transmission rate performance of the system adopting orthogonal channel resource partitioning is much smaller than the joint channel capacity domain of the broadcast channel, which causes a waste of spectrum efficiency. In addition, the conventional bit-division physical layer subchannel technique is applied to a single-antenna transmission system, and data bits of a plurality of services are directly mapped into bit-level physical layer subchannels.
In order to realize effective utilization of channel resources, the invention adopts a physical layer subchannel technology based on bit segmentation, and realizes compatible transmission of MIMO service and MISO service by dividing a broadcast channel into two bit-level physical layer subchannels, namely an MIMO service subchannel and an MISO service subchannel, at a bit level. The physical layer subchannel technique based on bit slicing has proven to be a multi-service transmission technique with an approaching broadcast channel capacity.
The following describes in further detail embodiments of the present invention with reference to the accompanying drawings. The following embodiments are provided to illustrate the present invention, but are not intended to limit the scope of the present invention.
First embodiment
Please refer to fig. 1, which is a block diagram of a multi-service transmission system 10 compatible with single antenna reception and multi-antenna reception according to the present invention. The described transmission system 10 compatible with single and multiple antenna receivers is applied in broadcast channels.
The transmission system 10 compatible with the single antenna receiver and the multi-antenna receiver comprises a transmitter 11 and a receiver 12, wherein the transmitter 11 adopts a multi-antenna architecture and is used for transmitting two different service data. The two different service data are a service MISO service (hereinafter, referred to as MISO service) for receiving and decoding by a Single-antenna receiver and a multi-antenna receiver at the same time, and a service (hereinafter, referred to as MIMO service) for receiving and decoding by a multi-antenna receiver only, respectively. The receiver 12 includes a single antenna receiver 121 and a multi-antenna receiver 122 in the network, wherein the single antenna receiver 121 is used for decoding the basic MISO service from the signal transmitted from the transmitter 11, and the multi-antenna receiver 122 is used for decoding the basic MISO service and the additional MIMO service.
The present embodiment considers a broadcast channel multi-service system with dual antenna transmission, which is used for transmitting two services: the MIMO service comprises a MISO service and a MIMO service, wherein the MISO service is simultaneously received and decoded by a single-antenna receiver and a double-antenna receiver, and the MIMO service is only received and decoded by the double-antenna receiver.
It should be noted that, for a broadband wireless mobile system capable of bidirectional data transmission, the present embodiment corresponds to a downlink, that is, the transmitter 11 may be a signal base station or a broadband wireless router, and the receiver 12 may be a mobile phone or a tablet computer. In another embodiment of the present invention, the transmitter 11 may be a signal base station and the receiver 12 may be a digital signal receiver of an audio/video playing device such as a television, corresponding to a terrestrial broadband broadcasting system with unidirectional data transmission.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for transmitting and receiving broadcast channel data in a multi-service transmission system 10 compatible with single antenna reception and multi-antenna reception according to a first embodiment of the present invention. The following describes in detail the working process of the multi-service transmission system 10 compatible with single-antenna reception and multi-antenna reception with reference to fig. 1 and fig. 2, and the specific steps are as follows:
step S11, channel error control coding and bit interleaving are performed independently on the data of the MISO service and the data of the MIMO service, respectively, to obtain transmission data bit streams of the MISO service and the MIMO service. Wherein, x is adopted1[k]And x2[k]To represent the kth symbol in the transmitted symbol sequence on the two transmit antennas, respectively.
Step S12, grouping the physical layer symbol sequences according to the service quality requirement required by the MISO service and MIMO service transmission and the multi-antenna constellation used by the data transmission device. Wherein the data transmission device is also the transmitter 11, and in addition, the data transmission symbol sequence x1[k]And x2[k]Are all used 2m＝MThe order constellation is modulated.
The required service quality requirements comprise data rate required by transmission of two services, namely MISO service and MIMO service, and required minimum decoding threshold. The grouping of the physical layer symbol sequence means that a plurality of adjacent symbols in a symbol stream transmitted in a physical layer channel form a whole.
And step S13, according to the service quality requirement required by MISO service and MIMO service transmission, dividing each physical layer symbol grouping at the bit level to obtain the MISO service sub-channel and the MIMO service sub-channel at the bit level.
By bi[k]To represent the mapping into xi[k]The bit vector of (a), wherein,
bit vector b is transformed using bit-level physical layer subchannel technique1[k]And b2[k]A part of bits in the MIMO service are distributed to the MIMO service to form an MIMO service sub-channel; and the other part of the bits are distributed to the MISO service to form a MISO service sub-channel.
According to the required qos requirement, the physical layer symbol sequence packet obtained in step S2 is divided into two bit-level subchannels for transmitting the MISO service and the MIMO service, respectively, by dividing bits included in the symbol sequence packet.
The bit-level sub-channel for transmitting MISO service is referred to as MISO service sub-channel, and the bit-level sub-channel for transmitting MIMO service is referred to as MIMO service sub-channel.
Step S14, the transmission data bits of the MISO service and the MIMO service are filled into the corresponding bit-level sub-channels. Wherein, the data bits of MIMO service are filled in the MIMO service sub-channel, and the data bits of MISO service are filled in the MISO service sub-channel. Then a bit vector b filled with data bits of two servicesi[k]Mapping into a transmit symbol x according to a constellation diagrami[k]. Further, of MIMO serviceThe data bits are directly and independently mapped to the MIMO service sub-channels, and the mapping of the data bits of the MISO service to the MISO service sub-channels also comprises a plurality of modes, so that the sub-channel filling mode of the MISO service needs to be selected according to actual needs.
Specifically, since the multi-service transmission system 10 compatible with single antenna reception and multi-antenna reception is a multi-antenna transmission, single antenna reception, and multi-antenna reception system, inter-antenna coding is considered in mapping the data bit stream of MIMO service and MISO service to the bit-level sub-channel. Thus, for MIMO services, the same direct mapping approach as the conventional bit-split physical layer subchannel technique can be used. For the MISO service, the present embodiment includes three mapping modes, which are respectively independent coding direct mapping, that is, inter-antenna coding is not adopted; inter-antenna repetition coding mapping; and mapping antenna space-time block coding.
The specific way of filling the data bits of the MIMO service into the MIMO service sub-channel is to sequentially fill the data bit sequence of the MIMO service into each bit position in the MIMO service sub-channel. And for the bit positions of the MIMO service sub-channels on different antennas, filling data bits of the MIMO service in a spatial multiplexing mode without using a constraint relation between the antennas.
Referring to fig. 2 and fig. 3, fig. 3 is a flowchart illustrating selection of a manner in which data bits of the MISO service are mapped to the MISO service sub-channels as shown in fig. 2. As shown in fig. 3, mapping the data bits of the MISO service to the sub-channels of the MISO service includes three ways, and the user can select the sub-channel filling way of the MISO service according to the actual requirement:
step S141, independent coding direct padding: and directly filling data bits of the MISO service on the MISO service sub-channel. The specific way of directly filling the data bits of the MISO service into the MISO service sub-channel is to sequentially fill the data bit sequence of the MISO service into each bit position in the MISO service sub-channel. For the bit positions of the MISO service sub-channels on different antennas, the data bits of the MISO service are filled in a space multiplexing mode without using the constraint relation among the antennas.
Specifically, the data bits of the MISO service are directly padded on the MISO service subchannels, i.e. without inter-antenna coding. For a MISO service subchannel, each bit position in the bit vector is filled with a different bit in the MISO service data bit stream. Bit vector b filled with MIMO service and MISO service data bits1[k]And b2[k]Is mapped into a constellation symbol x by the same mapping mode1[k]And x2[k]. As shown in fig. 4, fig. 4 is a schematic diagram of data bit filling and constellation mapping when the MISO service does not use inter-antenna coding in the data filling manner shown in fig. 2, where the constellation diagram takes 16-QAM as an example, so that a bit vector on each transmit antenna includes 4 bits, and the constellation mapping manner uses Gray mapping.
And step S142, filling data bits of the MISO service into the MISO service sub-channel by adopting a mode of repeated coding mapping among antennas, and ensuring that the bits at the same position on different transmitting antennas are the same. The filling method of the MISO service data bits to the MISO service sub-channel means that the data bit sequence of the MISO service is sequentially filled to each bit position of the part of the MISO service sub-channel transmitted by the same antenna, so that the bit sequences transmitted by all the transmitting antennas in the MISO service sub-channel are the same.
Specifically, data bits of the MISO service are mapped onto the MISO service sub-channels, and bits at the same position on different transmission antennas are guaranteed to be the same. As shown in fig. 5, fig. 5 is a schematic diagram of data bit padding and constellation mapping when the MISO service uses inter-antenna repetition coding in the data padding scheme shown in fig. 2. First, when dividing the sub-channels, it is ensured that bits at the same position in the bit vectors of different transmitting antennas are allocated to the same sub-channel. That is, bit b in the bit vector1 (j)[k]And
or simultaneously to MISO subchannels or simultaneously to MIMO traffic subchannels. When filling MISO service data bits for MISO service sub-channels, for two bitsBits at the same position of the vector fill the data bits of the same MISO service, i.e. if b1 (j)[k]And
belongs to MISO service sub-channel, then satisfies
The constellation mapping mode is the same as the constellation mapping adopted by the method 1, and the bit vector b of the service bit stream is filled1[k]And b2[k]Is mapped into a constellation symbol x by the same mapping mode1[k]And x2[k]。
And step S143, filling the data bits of the MISO service to the MISO service sub-channel by adopting antenna space-time block coding mapping, and ensuring that the bits at the same position on different transmitting antennas of adjacent symbols meet the space-time diversity coding criterion.
The filling mode of the MISO service data bits to the MISO service sub-channel means that the data bit sequence of the MISO service is filled on the MISO service sub-channel, and the MISO service sub-channel is coded through space-time diversity, so that a plurality of transmitting antennas meet the space-time block coding criterion between adjacent transmitting symbols under the condition of only considering the MISO service sub-channel.
Specifically, data bits of the MISO service are mapped onto the MISO service sub-channel, and bits at the same position on different transmission antennas of adjacent symbols are ensured to meet the space-time diversity coding criterion. The same way as bit-level subchannel division, which also requires that bits at the same position in different bit vectors are allocated to the same service, i.e. bit b1 (j)And
or simultaneously to MISO subchannels or simultaneously to MIMO traffic subchannels. And requires that within the space-time grouping of vectors, the traffic subchannels are assigned in the same manner. In this embodiment, a dual antenna transmitter is used, and thus the length of the space-time packet is 2.
Filling of service bits and constellation mapping such asFig. 6 is a schematic diagram illustrating data bit padding and constellation mapping when the MISO service uses antenna space-time block coding in the data padding scheme shown in fig. 2. At a first time in a space-time packet, independently filling the MISO service sub-channel at the time with the data bits of the MISO service; at the second time in the same space-time grouping, the bits on the MISO service sub-channel are the same as the bits at the same positions of the bit vectors on different transmitting antennas at the previous time, namely the MISO service data bit filling mode meets the constraint condition
When constellation mapping is carried out, at the first moment in the space-time grouping, the constellation mapping modes of two transmitting antennas are the same and are represented by T; at the second time in the space-time packet, the mapping modes of the two transmitting antennas are-T and-T respectively*I.e. a negative constellation and a negative conjugate constellation, respectively, mapped to the original constellation.
And step S15, according to the coding mode, constellation mapping is carried out on the bit vector filled with the service data. That is, in the present embodiment, only the baseband equivalent system under the flat fading channel is considered, that is, the transmitted data bit stream is mapped into the baseband symbol sequence after being subjected to channel coding.
After completing bit filling and constellation mapping, obtaining a baseband sending symbol xi[k]. X is to bei[k]And transmitting the data on an equivalent baseband system to finish multi-service transmission.
Step S16, receiving data, transmitting and transmitting through the equivalent baseband system, and obtaining a received signal sequence through a fading channel and superimposed noise, that is, the baseband symbol sequence is superimposed with noise after fading through the baseband equivalent channel. For frequency selective fading channels, OFDM can be used to translate to flat fading channels in the frequency domain. When OFDM is used, the baseband symbol sequence is a sequence of baseband symbols transmitted on different subcarriers.
In step S17, the receiver 12 for MISO service and the receiver 12 for MIMO service decode the received signals. The decoding comprises demapping and channel decoding, and the decoding mode adopts a mode based on independent demapping or a mode based on iterative demapping.
Specifically, please refer to fig. 2 and fig. 7 together, wherein fig. 7 is a flowchart of decoding the received signal by the receiver 12. As shown in fig. 7, the specific steps of the MISO receiver and the MIMO receiver to decode the received signal include:
step S171 is to decode the MISO service sub-channel, that is, to perform demapping and channel decoding on the MISO service sub-channel, and the MISO receiver and the MIMO receiver decode the MISO service sub-channel in the received signal, and decode the MISO service data bits therefrom.
In step S172, the type of the receiver 12 is determined, that is, whether the multi-antenna receiver 122 is included in the receiver 12 is determined.
Step S173, if the receiver is a multi-antenna receiver, the MIMO receiver decodes the received MIMO service sub-channel using the decoded data bits of the MISO service as prior information, and the decoding includes demapping and channel decoding, so as to decode the MIMO service data bits. Wherein, the data bits of the MIMO service are directly filled on the MIMO service sub-channel. If the receiver 12 is not a multi-antenna receiver, the process ends.
Second embodiment
Please refer to fig. 8, which is a flowchart illustrating a broadcast channel multi-service system 10 compatible with single antenna reception and multi-antenna reception according to a second embodiment of the present invention.
This embodiment is basically the same as the first embodiment, and differs only in the decoding method of the MIMO service and the MISO service.
Specifically, in step S21, channel error control coding and bit interleaving are independently performed on the data of the MISO service and the data of the MIMO service, so as to obtain transmission data bit streams of the MISO service and the MIMO service.
Step S22, grouping the physical layer symbol sequences according to the quality of service requirement required by MISO service and MIMO service transmission and the multi-antenna constellation used by the transmitting end.
And step S23, according to the service quality requirement required by MISO service and MIMO service transmission, dividing each physical layer symbol grouping at the bit level to obtain the MISO service sub-channel and the MIMO service sub-channel at the bit level.
Step S24, the transmission data bits of the MISO service and the MIMO service are filled into the corresponding bit-level sub-channels.
And step S25, according to the coding mode, constellation mapping is carried out on the bit vector filled with the service data.
Step S26, the transmission is transmitted through the equivalent baseband system, through a fading channel and superimposed noise.
In step S27, the receiver decodes the received signal. Wherein the decoding comprises demapping and channel coding.
For the single antenna receiver 121 (fig. 1), MISO traffic in the received signal is decoded directly; for the dual antenna receiver 122 (fig. 1), MISO traffic is first decoded from the received signal, and then MIMO traffic is further decoded with the decoded MISO traffic as a priori information.
In the decoding process, for the MISO service, firstly, the MISO service is demapped, and the Log-MAP demapping is used to obtain the bit-by-bit Log-likelihood ratio of the MISO service as follows:
wherein x represents a transmission symbol matrix, h represents a MISO fading channel matrix, y represents a signal received by a single-antenna receiver, and χ represents a multi-antenna joint constellation set under the MISO service data bit filling constraint,
represents satisfaction
Of constellation symbols of (a)2Representing the variance of the noise.
This way of demapping is called BICM independent demapping. The log-likelihood ratio obtained by demapping can be directly sent to a soft-in and soft-out channel decoder for channel decoding, and an independent demapping MISO service receiving bit stream is obtained.
Besides independent demapping, an iterative demapping method can also be adopted to further improve the decoding performance. The bit interleaved codes are decoded and then de-interleaved, and corresponding external information is calculated, and the external information is further used as prior information to be sent to a decoder again for decoding. Wherein, the calculation formula of the external information is
In the formula, LaRepresents the log-likelihood ratio of the a priori information,
representing the log-likelihood ratio, Pr (x | L), of the prior information at the jth bit position of the ith antennaa) Denotes a prior probability density function of a transmitted symbol, and Pr (y | x) denotes a posterior probability density function of a received symbol.
For the space-time coded MISO service data bit filling and constellation mapping mode, space-time decoding is performed first. For received symbols y 2k-1 and y 2k in a space-time packet, orthogonal decomposition is performed in the channel direction
Wherein h is [ h ]1，h2]Is a channel matrix.
Through orthogonal transformation, the interference between antennas of MISO service on the bits at the same position can be eliminated, and the distribution of equivalent channel fading is changed, thereby realizing space diversity. Taking r1 as an example, the conditional probability density function should be
Can be according to the above formula1And performing demapping operation, wherein the following decoding mode is the same as the decoding mode of other data bit filling and constellation mapping modes.
It can be shown that when BICM independent demapping is used, the bit-by-bit BICM average mutual information of the two services can be calculated by the following formula, when MISO service uses independent coding and repetition coding:
where H denotes the MIMO fading channel matrix, EA[·]Representing the mathematical expectation with respect to the random variable a and y representing the received signal.
When the MISO service employs space-time coding:
fig. 9 is a diagram showing a bit-by-bit interleaving coding modulation curve of MISO service and MIMO service when MISO service does not adopt inter-antenna coding in data decoding shown in fig. 8. As shown in fig. 9, it is clearly demonstrated that the bit-by-bit BICM average mutual information of the two services is in the case of 16-QAM constellation when MISO service does not employ inter-antenna coding. Since there are two bits with different protection levels in the 16-QAM constellation, there are two curves for each service.
As shown in fig. 10, fig. 10 is a diagram illustrating MISO service coding modulation curve when MISO service employs inter-antenna repetition coding and space-time coding in data decoding shown in fig. 8. As shown in fig. 10, which clearly demonstrates the bit-by-bit BICM average mutual information of the MISO service when the MISO service employs inter-antenna repetition coding and space-time coding, the constellation diagram also employs 16-QAM.
Third embodiment
Please refer to fig. 11, which is a flowchart illustrating a broadcast channel multi-service system 10 compatible with single antenna reception and multi-antenna reception according to a third embodiment of the present invention.
This embodiment is basically the same as the first embodiment, and differs only in the decoding method of the MIMO service and the MISO service.
Specifically, in step S31, channel error control coding and bit interleaving are independently performed on the data of the MISO service and the data of the MIMO service, so as to obtain transmission data bit streams of the MISO service and the MIMO service.
Step S32, grouping the physical layer symbol sequences according to the quality of service requirement required by MISO service and MIMO service transmission and the multi-antenna constellation used by the transmitting end.
And step S33, according to the service quality requirement required by MISO service and MIMO service transmission, dividing each physical layer symbol grouping at the bit level to obtain the MISO service sub-channel and the MIMO service sub-channel at the bit level.
Step S34, the transmission data bits of the MISO service and the MIMO service are filled into the corresponding bit-level sub-channels.
And step S35, according to the coding mode, constellation mapping is carried out on the bit vector filled with the service data.
Step S36, the transmission is transmitted through the equivalent baseband system, through a fading channel and superimposed noise.
In step S37, the receiver decodes the received signal. Wherein the decoding comprises demapping and channel coding.
With (R)A，RB) Representing the joint transmission rate of MIMO traffic and MISO traffic. Signal-to-noise ratio threshold (gamma) for given MIMO and MISO trafficA，γB) Next, each bit-level subchannel allocation scheme siCorresponds to one (R)A，RB) Value of
The physical layer symbol packet described in the step S32 is preset with N symbols. Setting the joint transmission rate of MIMO service and MISO corresponding to the ith symbol as
The average joint transmission rate over N symbols is
(R) may be achieved by adjusting the bit-level subchannel allocation scheme for each symbolA，RB) Different values of (A) are denoted as (R)A，i，RB，i)。
At a joint transmission rate (R)A，i，RB，i) Of all possible values of (a), the following steps can be used to search its upper bound:
c1 in all (R)A，i，RB，i) In the set of values of (2), select
At this time
Indicating that all bits in the bit vector are allocated to the MIMO service subchannel at the moment;
c2 for akGreater than 1, has
The joint transmission rate of MIMO service and MISO service is bounded by
It is given.
Referring to fig. 12, fig. 12 is a graph illustrating joint transmission rate curves of MIMO service and MISO service in data decoding shown in fig. 11. As shown in fig. 12, when the MISO service employs independent coding, inter-antenna repetition coding, and space-time coding, and BICM independent demapping, the joint transmission rate variation curve of the MIMO service and the MISO service. The two antennas of the transmitter are modulated by adopting a 16-QAM constellation diagram, a fading channel adopts a Rayleigh channel, and the decoding thresholds of the MIMO service and the MISO service are respectively 10dB and 5 dB. The joint transmission rates when time division multiplexing is used to transmit multiple services are also shown in fig. 6. It can be seen that the broadcast channel multi-service system proposed by the present invention has significant performance gain in joint transmission rate compared to the time division multiplexing system. In addition, in the sub-channel filling and constellation mapping modes of various MISO services, the gain of the joint transmission rate of the space-time coded multi-service is the largest.
When the BICM iterative demapping is adopted, the multi-service joint transmission rate can further obtain gain, i.e., approximate Coded Modulation (CM) average mutual information. Under the determined bit level sub-channel division scheme, the calculation formula of the multi-service joint transmission rate obtained by adopting BICM iterative demapping is as follows:
for MISO traffic:
for MIMO services:
wherein N isbpcuIndicating the number of bits used per channel, EA[·]Represents the mathematical expectation with respect to a random variable A, H4Representing channel state information of a MIMO receiver, hBRepresenting channel state information of the MISO receiver.
Referring to fig. 13, fig. 13 is a graph illustrating an upper bound of joint transmission rate performance of MIMO service and MISO service when employing BICM iterative demapping in data decoding as shown in fig. 12. As shown in fig. 13, the constellation diagram of the transmitting antenna still adopts 16-QAM, the fading channel adopts Rayleigh channel, the decoding thresholds of MIMO service and MISO service are 10dB and 5dB respectively, and the MISO service subchannel filling and constellation mapping mode is space-time coding. It can be seen that further performance gains compared to BICM independent demapping can be obtained with BICM iterative demapping. The broadcast channel capacity at gaussian input, i.e. the theoretical maximum value of the broadcast channel transmission rate, is also given in fig. 7. Through comparison, the broadcast channel multi-service transmission system compatible with single-antenna receiving and multi-antenna receiving provided by the invention has the performance approaching to the limit of the theoretical joint transmission rate.
The above embodiments are merely to illustrate the technical aspects of the present invention, not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.
Claims (20)
1. A broadcast channel data transmitting and receiving method, said method compatible with single antenna reception and multi-antenna reception broadcast channel multi-service transmission, capable of simultaneously transmitting MISO service and MIMO service, comprising the steps of:
preparation of transmission data: channel error control coding and bit interleaving are independently performed on the data of the MISO service and the data of the MIMO service respectively to obtain transmission data bit streams of the MISO service and the MIMO service;
grouping: grouping the physical layer symbol sequences according to service quality requirements required by MISO service and MIMO service transmission and a multi-antenna constellation used by data transmitting equipment; the required service quality requirements comprise a data rate required by transmission of two services, namely MISO service and MIMO service, and a required minimum decoding threshold; grouping the physical layer symbol sequence into a whole by a plurality of adjacent symbols in a symbol stream transmitted in a physical layer channel;
acquiring a service sub-channel: dividing each physical layer symbol group at a bit level to obtain a MISO service subchannel and an MIMO service subchannel at the bit level;
data padding and constellation mapping: filling transmission data bits of the MISO service and the MIMO service into corresponding bit level sub-channels, mapping bit vectors filled with service data onto a constellation diagram, and transmitting through a baseband equivalent channel;
and (3) data receiving and decoding: and decoding the MISO service sub-channel in the received signal, decoding MISO service data bits from the MISO service sub-channel, and then decoding the MIMO service by using the decoded MISO service data bits as prior information by the MIMO receiver.
2. The broadcast channel data transmitting and receiving method as claimed in claim 1, wherein the MIMO service data bits are padded into the MIMO service subchannels in the data padding step in such a manner that data bits of the MIMO service are sequentially padded into each bit position of the MIMO service subchannels.
3. The broadcast channel data transmitting and receiving method according to claim 1, wherein said MISO service data bits are padded to MISO service subchannels in said data padding step, and the bit vector constellation mapping is performed in a manner including:
independent coding direct padding: filling data bits of the MISO service directly into the MISO service sub-channel; or
Inter-antenna repetition coding: filling data bits of the MISO service into the MISO service sub-channel, and ensuring the same bits at the same position on different transmitting antennas; or
Space-time block coding: and filling data bits of the MISO service into the MISO service sub-channel, and ensuring that the bits at the same position on different transmitting antennas of adjacent symbols meet the space-time diversity coding criterion.
4. The broadcast channel data transmitting and receiving method according to claim 3, wherein said independent coding scheme is a scheme in which data bits of the MISO service are directly padded to the MISO service subchannel in such a manner that a data bit sequence of the MISO service is sequentially padded to each bit position in the MISO service subchannel.
5. The broadcast channel data transmitting and receiving method according to claim 4, wherein in said independent coding scheme, for bit positions of the MISO service subchannel on different antennas, data bits of the MISO service are filled in a spatial multiplexing scheme without using a constraint relationship between the antennas.
6. The broadcast channel data transmitting and receiving method according to claim 3, wherein the data bit sequence of the MISO service is sequentially padded to each bit position of the portion of the MISO service subchannel transmitted by the same antenna in the inter-antenna repetition coding scheme so that the bit sequences transmitted by all the transmitting antennas in the MISO service subchannel are the same.
7. The broadcast channel data transmission reception method of claim 6, wherein when the subchannels are divided such that bits at the same position in bit vectors of different transmission antennas are allocated to the same subchannel, when MISO service data bits are filled for the MISO service subchannels, data bits of the same MISO service are filled for bits at the same position of two bit vectors.
8. The broadcast channel data transmitting and receiving method according to claim 3, wherein the data bit sequence of the MISO service is padded on the MISO service subchannel in the space-time block coding scheme, and space-time diversity coding is performed so that the plurality of transmission antennas satisfy the space-time diversity coding criterion between adjacent transmission symbols in consideration of only the MISO service subchannel.
9. The broadcast channel data transmitting and receiving method according to claim 1, wherein said decoding means in said data reception decoding step includes a means based on independent demapping and a means based on iterative demapping.
10. The broadcast channel data transmission receiving method as claimed in claim 1, further comprising, after the data padding step, the steps of:
and according to the coding mode, carrying out constellation mapping on the bit vector filled with the service data to form a baseband symbol sequence.
11. The broadcast channel data transmitting and receiving method according to claim 1, wherein in the data receiving and decoding step, the baseband symbol sequence is transmitted through an equivalent baseband system, and the received symbol sequence is obtained through a fading channel and superimposed noise.
12. The broadcast channel data transmission reception method as claimed in claim 1, further comprising at the data reception decoding step:
decoding the MISO service sub-channel in the received symbol sequence to obtain the data bit of the MISO service;
if the receiving device is a multi-antenna receiving device, the MIMO receiver decodes the received MIMO service subchannel using the decoded data bits of the MISO service as prior information, the decoding includes demapping and channel decoding, thereby decoding the MIMO service data bits, wherein the data bits of the MIMO service are directly filled into the MIMO service subchannel.
13. A method for transmitting broadcast channel data, said method being compatible with single antenna reception and multi-antenna reception broadcast channel multi-service transmission, and being capable of simultaneously transmitting MISO service and MIMO service, comprising the steps of:
preparation of transmission data: channel error control coding and bit interleaving are independently performed on the data of the MISO service and the data of the MIMO service respectively to obtain transmission data bit streams of the MISO service and the MIMO service;
grouping: grouping the physical layer symbol sequences according to service quality requirements required by MISO service and MIMO service transmission and a multi-antenna constellation used by data transmitting equipment; the required service quality requirements comprise a data rate required by transmission of two services, namely MISO service and MIMO service, and a required minimum decoding threshold; grouping the physical layer symbol sequence into a whole by a plurality of adjacent symbols in a symbol stream transmitted in a physical layer channel;
acquiring a service sub-channel: dividing each physical layer symbol group at a bit level to obtain a MISO service subchannel and an MIMO service subchannel at the bit level;
data padding and constellation mapping: filling the transmission data bits of the MISO service and the MIMO service into corresponding bit level sub-channels, mapping the bit vectors filled with the service data onto a constellation diagram, and transmitting through a baseband equivalent channel.
14. The broadcast channel data transmitting method of claim 13, wherein the MIMO service data bits are filled in the MIMO service sub-channel in the data filling step in such a manner that data bits of the MIMO service are sequentially filled in each bit position of the MIMO service sub-channel.
15. The broadcast channel data transmission method of claim 13, wherein said MISO service data bits are padded to MISO service subchannels in said data padding step, and the bit vector constellation mapping is performed in a manner comprising:
independent coding direct padding: filling data bits of the MISO service directly into the MISO service sub-channel; or
Inter-antenna repetition coding: filling data bits of the MISO service into the MISO service sub-channel, and ensuring the same bits at the same position on different transmitting antennas; or
Space-time block coding: and filling data bits of the MISO service into the MISO service sub-channel, and ensuring that the bits at the same position on different transmitting antennas of adjacent symbols meet the space-time diversity coding criterion.
16. The broadcast channel data transmission method of claim 15, wherein said independent coding scheme is a scheme in which the data bits of the MISO service are directly padded to the MISO service subchannel by sequentially padding the data bit sequence of the MISO service to each bit position in the MISO service subchannel.
17. The broadcast channel data transmission method of claim 16, wherein in the independent coding scheme, for bit positions of the MISO service subchannel on different antennas, the data bits of the MISO service are padded in a spatial multiplexing scheme without using a constraint relationship between antennas.
18. The broadcast channel data transmission method of claim 15, wherein the data bit sequences of the MISO service are sequentially padded in the inter-antenna repetition coding mapping scheme at each bit position of the portion of the MISO service subchannel transmitted by the same antenna such that the bit sequences transmitted by all transmit antennas in the MISO service subchannel are the same.
19. The broadcast channel data transmission method of claim 18, wherein when the subchannels are divided such that bits at the same position in bit vectors of different transmission antennas are allocated to the same subchannel, when MISO service data bits are filled in for the MISO service subchannels, data bits of the same MISO service are filled in for bits at the same position in two bit vectors.
20. The broadcast channel data transmission method of claim 15, wherein the data bit sequence of the MISO service is padded on the MISO service subchannel in the space-time block coding scheme and space-time diversity coding is performed such that the plurality of transmit antennas satisfy the space-time diversity coding criterion between adjacent transmit symbols considering only the MISO service subchannel.
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