WO2009100650A1 - 联合模拟网络编码的中继方法、基站和用户设备 - Google Patents

联合模拟网络编码的中继方法、基站和用户设备 Download PDF

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Publication number
WO2009100650A1
WO2009100650A1 PCT/CN2009/000128 CN2009000128W WO2009100650A1 WO 2009100650 A1 WO2009100650 A1 WO 2009100650A1 CN 2009000128 W CN2009000128 W CN 2009000128W WO 2009100650 A1 WO2009100650 A1 WO 2009100650A1
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Prior art keywords
signal
analog
decoding
network coding
relay
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PCT/CN2009/000128
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English (en)
French (fr)
Inventor
Yonggang Wang
Yu Chen
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Alcatel-Lucent Shanghai Bell Co., Ltd.
Alcatel Lucent
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Application filed by Alcatel-Lucent Shanghai Bell Co., Ltd., Alcatel Lucent filed Critical Alcatel-Lucent Shanghai Bell Co., Ltd.
Priority to US12/866,096 priority Critical patent/US20100316097A1/en
Priority to EP09710559.7A priority patent/EP2242188A4/en
Priority to JP2010545349A priority patent/JP2011514729A/ja
Publication of WO2009100650A1 publication Critical patent/WO2009100650A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15521—Ground-based stations combining by calculations packets received from different stations before transmitting the combined packets as part of network coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit

Definitions

  • the present invention relates to wireless cellular network communication, and in particular to high-rate broadband wireless communication, such as 0F based on 3GPP LTE, and more particularly to a joint analog network coding relay method, and its receiving and transmitting method and apparatus.
  • Background technique
  • Network coding in a broad sense, is a multicast technology in which a node in a network encodes the received information and then forwards it out.
  • Multicast also known as multicast
  • Multicast is an important form of communication in the network.
  • a node acting as a relay can only copy, amplify, and forward received signals, which is sometimes a waste of network resources.
  • Network coding techniques break this limitation by allowing the relay node to encode the received information and reassemble and send the received multiple packets in accordance with a particular algorithm.
  • Network coding technology can significantly increase the data rate of multicast.
  • the maximum traffic of the network is the maximum transmission data rate from the source to the sink.
  • the maximum broadcast traffic refers to the maximum data transmission rate that each receiving point can receive when the source sends the same data to all receiving points at the same time.
  • the maximum flow depends on the topology of the network, ie the connection relationship and bandwidth of each node. Using the well-known maximum flow minimum cut theorem in graph theory, you can get the maximum flow from a source point to a sink point in a given network. Network coding actually uses node processing power for higher network efficiency.
  • the base station In a cellular wireless communication network, the base station has a fixed site and maximum transmit power. Therefore, the coverage range is constant, and in order to improve the performance of the user equipment UE at the cell edge, some wireless communication techniques, such as soft handover in a CDMA system, are performed. ⁇
  • some wireless communication techniques such as soft handover in a CDMA system.
  • UMTS Rel5 HSDPA and LTE there is no soft combining of macro diversity and power contribution from neighboring base stations in order to achieve independent faster and more flexible adaptive modulation coding AMC, MAC scheduling and LI HARQo Therefore, a higher peak data transmission rate can be achieved when the UE is at the center of the cell.
  • the UE when the UE is away from the site, such as at the cell edge, there is no particularly good technique to improve service transmission performance to increase spectral efficiency.
  • the wireless relay concept has been introduced in WiMax, but the wireless relay concept has not been discussed in cellular networks. Because the present invention is a new application in cellular network communication, there is no solution in the current prior art. Law.
  • Fig. 1 shows the configuration of a cellular network having a wireless relay station.
  • the relay station is located at a distance of 1/3 of the edge of the cell.
  • the relay station may have baseband processing functionality and may forward data from the eNB.
  • the relay station transmits data on a source of the same frequency as that used by the eNB but time division multiplexed with the source.
  • Fig. 2 is a diagram showing the structure of a relay station when amplifying and forwarding are performed in a communication device having a wireless relay station.
  • the relay station receives analog data from the eNB via the ⁇ antenna, samples and analog-to-digitally converts the ADC; symbolizes the digital signal after the ADC; and then amplifies the digitized digital level; The amplified digital level is digital-to-analog converted and shaped, and the shaped analog signal is forwarded via the antenna.
  • Fig. 2 is a diagram showing the structure of a relay station when amplifying and forwarding are performed in a communication device having a wireless relay station.
  • the relay station receives analog data from the eNB via the ⁇ antenna, samples and analog-to-digitally converts the ADC; symbolizes the digital signal after the ADC; and then amplifies the digitized digital level;
  • the amplified digital level is digital-to-analog converted and shaped, and the shaped analog signal is forwarded via the antenna.
  • FIG. 3 is a diagram showing the structure of a relay station when encoding and forwarding are performed in a communication device having a wireless relay station.
  • the relay station receives analog data from the eNB via an antenna, and samples and ADCs; divides the digital signal after the ADC into two signals, and one signal performs an action as shown in FIG. 2, for the symbolized number.
  • the level is amplified, and the other signal is demodulated and decoded.
  • a cyclic redundancy check (CRC) check is performed, and encoding and modulation are performed simultaneously.
  • CRC check if the CRC check is passed, demodulation, decoding, and decoding are performed.
  • the coded and modulated signal is DAC and shaped, and if the CRC is not passed, MC and shaping are performed on the amplified signal after sampling and ACD, and finally the shaped analog signal is forwarded via the antenna.
  • CRC cyclic redundancy check
  • the object of the present invention is to propose a cellular network configuration using a wireless relay station in conjunction with an analog network coding, that is, a network coding of physical signals carrying information from a plurality of sources, and a transmission/reception scheme and a transmitter/receiver are also disclosed. design.
  • a relay method for joint analog network coding is provided, which is used in a cellular network system having a relay station, comprising the steps of: receiving information signals from a plurality of base stations eNB; Signals are sampled and analog-to-digital converted; analog network coding is performed on analog signal levels carrying information from a plurality of base stations; symbols encoded by the analog network are forwarded; and the forwarded symbols are received, and the symbols are converted into Information signal.
  • the base station eNB also includes a preceding relay station that forwards data, and performs analog network coding on signals from the base station eNB and the preceding relay station.
  • the relay station alternately performs time division and carries an analog network coded information signal.
  • the analog network coding comprises physical signal summation.
  • the summing of the physical signals comprises weighting and summing the signal blocks divided according to the time slots.
  • a receiving method for joint analog network coding relay is provided, which is used in a cellular network system having a relay station, and includes the following steps: cooperating signals from a plurality of base station eNBs or relay stations MIM0 operation;
  • the user equipment decodes the signal received through the multi-input multi-output MI.M0 operation through joint guessing technology.
  • the joint technique comprises M1M0 spatial demultiplexing.
  • the joint technique includes a serial interference cancellation STC.
  • the decoding method is the most approximate ML.
  • the decoding method is a zero forcing algorithm ZF and a minimum mean square error algorithm MMSE.
  • the UE After the UE receives the signal, it performs decoding using chase combining or incremental redundancy IR combining.
  • a base station comprising: a sampling and ADC unit, sampling and analog-to-digital conversion of a signal to be transmitted; an encoding unit, an analog signal level for carrying information from a plurality of base stations Perform analog network coding; the transmitting unit forwards the symbols encoded by the analog network.
  • the coding unit implements analog signal coding by physical signal summation.
  • the coding unit implements analog signal coding by weighting and summing signal blocks divided according to time slots.
  • a user equipment UE comprising: a receiving unit configured to receive information from a base station; a decoding unit to perform decoding by a joint detection technique; and a transmitting unit to forward the decoded signal.
  • the joint technique includes MIM0 spatial demultiplexing.
  • the joint technique includes a serial interference cancellation SIC.
  • the decoding unit performs decoding using the most approximate method L.
  • the decoding unit performs decoding using a zero-forcing algorithm ZF and a minimum mean square error algorithm.
  • the decoding unit performs decoding using chase combining or incremental redundancy IR combining.
  • the relay station performs analog network coding, that is, carries a physical signal carrying information of a current time slot/block analog network encoded by a prior physical signal to transmit service data.
  • analog network coding that is, carries a physical signal carrying information of a current time slot/block analog network encoded by a prior physical signal to transmit service data.
  • the UE receives data from the eNB and relays it, and detects the time slot by cooperative MIM0 solution spatial multiplexing MUX or serial interference cancellation; each time the UE only reserves one time slot hard decision Other existing soft information is used for the next time slot decision, which improves the reception performance of the UE.
  • the UE When decoding and forwarding data, the UE buffers the soft information of one block received from the eNB, and then uses Cha.se combining or IR combining to obtain the diversity gain after receiving the data from the relay station. Based on analysis in the virtual matrix form theory federated by the eNB and the relay, it is found that joint detection in the receiver can provide at least similar performance to conventional 2*2 transmit diversity. In addition, analog network coding in a two-symbol relay station achieves similar performance to 3 X 3MIM0. The gain is even greater due to the larger SNR received from the relay station. An advantage of the present invention over the best prior art is that joint analog network coding and wireless relay are a new application in wireless communication.
  • the combination of wireless relay and analog network coding is a low-cost, low-complexity solution.
  • the scheme can improve service transmission performance and increase cell coverage when the UE is at the cell edge.
  • FIG. 1 shows a configuration of a cellular network with a wireless relay station
  • FIG. 2 is a schematic diagram showing the structure of a relay station when performing amplification and forwarding in a communication device having a wireless relay station;
  • Figure 3 is a diagram showing the structure of a relay station when encoding and forwarding in a communication device having a wireless relay station;
  • Figure 4 shows the channel response vector in the 2 X 2 cooperative M 0 scheme
  • Figure 5 shows the channel response vector in the 2 X 1 macro diversity scheme
  • FIG. 6 shows a flow chart of an analog network coding method in accordance with an embodiment of the present invention
  • Figure 7 shows the physical processing structure of the UE receiver, which is an L1 structure using cooperative solution spatial multiplexing
  • Figure 8 shows the physical processing structure of the UE receiver, where is the structure using the SIC;
  • Figures 9a and 9b show the data transmission when using analog network coding for amplification and forwarding;
  • Figures 10a and 10b show the use Schematic diagram of data transmission during decoding and forwarding of analog network coding Figure
  • Figure 11 is a diagram showing the use of analog network coding for data amplification and forwarding in a communication device having a wireless relay station;
  • Figure 12 is a diagram showing the structure of a relay station when encoding and forwarding in a communication device having a wireless relay station by using analog network coding;
  • Figure 13 shows a relay receiver and transmitter system with two half-duplex relay stations
  • Figure 14 is a diagram showing the data transmission in decoding and forwarding using analog network coding in a time slot relay station
  • Figure 15 is a diagram showing the data transmission of two time slot relay stations using decoding and forwarding of analog network coding. detailed description
  • a joint analog network coding and a wireless relay configuration are proposed.
  • the two relay stations alternately time split to transmit traffic from the source, i.e., physical signals carrying information of the analog network with the current time slot encoded prior, along with the analog network coded information.
  • serial interference cancellation and detection of prior information from the base station can be applied. If there is more than one receiver antenna, the cooperation M 0 in the base station and the relay station can be applied, with the existing information as a branch.
  • joint detection in the receiver can provide at least similar performance to conventional 2 X 2 transmit diversity.
  • analog network coding in a two-symbol relay station yields similar performance for 3 X 3MI M0. However, due to the large SNR received from the relay, the gain is actually greater.
  • An analog network coding method is applied to an analog signal in a system having a relay station, wherein the analog signal signal carries information from a plurality of sources.
  • the UE may apply a joint detection technique: a cooperative space resolution ffl in the base station and the relay station.
  • Figure 4 shows the channel response vector in the 2 X 2 cooperative M0 scheme.
  • Figure 5 shows the channel response vector in the 2 X 1 macrodiversity scheme.
  • FIG. 6 shows a flow chart of a relay method for joint analog network coding in accordance with an embodiment of the present invention.
  • the method includes the steps of: receiving information from a plurality of base stations eNB; performing sample and analog-to-digital conversion on the received information; and performing digitized analog signal levels on information carrying information from the plurality of base stations. Simulating network coding; forwarding the network encoded symbols; and receiving the forwarded symbols, converting the symbols into letters Interest signal.
  • the analog network coding refers to the summation of physical signals, that is, the signal coding of the analog signal level.
  • the summing of the physical signals includes weighting and summing the signal blocks divided according to the time slots.
  • the base station eNB may also include a prior relay station that forwards data, and performs analog network coding on signals from the base station eNB and the preceding relay station. The relay station alternately performs time division and carries analog network coded information.
  • a joint analog network coding relay receiving method is used in a cellular network system having a medium relay station, including the following Step: MTM0 operation for cooperating signals from a plurality of base station eNBs or relay stations; the user equipment decodes the signals received through the multiple input multiple output MIM0 operation by joint detection technology.
  • the joint technology includes MIM0 spatial demultiplexing.
  • the joint technique includes serial interference cancellation S i 'C.
  • the decoding method may be the most approximate ML, or the zero-forcing algorithm ZF and the minimum mean square error algorithm MMSE. After the UE receives the signal, it performs decoding using Chase combining or incremental redundancy IR combining.
  • a base station includes: a sampling and ADC unit that performs sampling and analog-to-digital conversion on a signal to be transmitted; an encoding unit that performs analog network coding on an analog signal level carrying information from a plurality of base stations; Unit, forwards the code encoded by the analog network.
  • the coding unit implements analog signal coding by summing physical signals.
  • the coding unit implements analog signal coding by weighting and summing signal blocks divided according to time slots.
  • the user equipment UE includes: a receiving unit configured to receive information from the base station; a decoding unit to perform decoding by a joint detection technology; and a transmitting unit to forward the decoded signal.
  • the joint technology includes MIM0 spatial demultiplexing.
  • the joint technique includes serial interference cancellation
  • the decoding unit may perform decoding using the most approximate ML, or may perform decoding using a zero-forcing algorithm ZF and a minimum mean square error algorithm MMSE. After the UE receives the signal, the decoding unit performs decoding using Chase combining or incremental redundancy IR combining.
  • the UE receiver and the detection method when the channel response vector corresponding to Figs. 4 and 5 is decoded and forwarded after the analog network coding is applied will be explained with reference to Figs. 7 and 8.
  • Fig. 7 shows a physical processing structure of a UE receiver in which a user equipment UE has two antennas using an L1 structure of WM0 spatial demultiplexing.
  • the relay station when decoding and forwarding data, the relay station decodes the signal samples and performs a cyclic redundancy check CRC check, and then re-encodes the data and forwards it to the UE, wherein the transmission in the relay station is later than the eNB transmission. The delay of one time slot.
  • the user equipment UE at the receiving end can The MIM0 spatial demultiplexing is applied to the data signals received from the base station eNB and the relay station.
  • the UE buffers the soft information of one block received from the eNB, and then adopts Chase combining or IR combining after receiving the data from the relay station to obtain a diversity gain.
  • Fig. 8 shows the physical processing structure of the UE receiver, in which the L1 structure using the SIC is used, and the user equipment UE has a root antenna.
  • the UE at the receiving end can apply serial interference cancellation (SIB) and detection of existing information from the eNB.
  • SIB serial interference cancellation
  • Figures 9a and 9b show data transmissions during amplification and forwarding using analog network coding.
  • the data relay when amplifying and forwarding data is explained by taking two relay stations as an example.
  • the relay station amplifies the signal samples and forwards them to the UE, where the transmissions in the relay are delayed by more than one time slot transmitted from the eNB.
  • the relay station 1 amplifies and forwards only odd data
  • the relay station 2 only amplifies and relays even data
  • the delay time of the relay station for the data is one slot (slot) o.
  • the coding method is not limited thereto, and any analog network coding method is It can be applied to the amplification and forwarding of data in a relay station, such as coefficients defined as kl and k2 and complex, or network coding of more than two symbols.
  • the two slot coding relay stations shown in Figure 9b can be used.
  • the existing information (soft decision information) of more than one previous time slot is used for detection. Due to spatial multiplexing between the eNB and the relay station, the UE should apply joint detection technology.
  • the joint detection method 1 is: base station and relay station middle Collaboration ⁇ 1 ⁇ 0 spatial multiplexing and detection of existing information from the eNB; the joint guessing method 2 is: serial interference cancellation and detection of existing information from the eNB.
  • Figures 10a and 10b show schematic diagrams of data transmissions during decoding and forwarding using analog network coding.
  • the data relay at the time of amplifying and forwarding data is explained by taking two relay stations as an example.
  • the relay station Upon decoding and forwarding the data, the relay station decodes the signal samples and performs a CRC check, then re-encodes the data and forwards it to the UE, where the data block transmitted in the relay station is two blocks shorter than the data block transmitted from the eNB. Delay.
  • the receiver can apply MIM0 solution spatial multiplexing in base stations and relay stations.
  • the UE receiver buffers the soft information in one block and uses Chase combining or IR combining after receiving data from the relay station.
  • the receiver can apply serial interference cancellation as well as detection of existing information from the eNB.
  • the presence of a relay station node may not affect the operation of the eNB, such as AMC, MAC scheduling, and L1 HARQ.
  • the eNB does not care if there is a relay node, and there is no uplink from the relay station to the eNB.
  • the way, and control signaling is transmitted directly between the eNB and the UE.
  • the relay station only receives the traffic data and forwards it to the UE, but it will be appreciated that the design of the control signaling in other manners does not affect the implementation of the present invention.
  • Figure 11 is a diagram showing the use of analog network coding to perform data amplification and forwarding in a communication device having a wireless relay station.
  • the relay station receives analog data from the eNB via an antenna, and samples and analog-to-digitally converts the ADC; symbolizes the digital signal after the ADC; and then amplifies the symbolized signal; The analog network coding is performed.
  • the analog network coded signal is digital-to-analog converted and shaped, and the shaped analog signal is forwarded through the antenna to realize data amplification and forwarding in the towel relay station.
  • Fig. 12 is a diagram showing the structure of a relay station when encoding and forwarding are performed in a communication device having a wireless relay station by using analog network coding.
  • the relay station receives the game data from the eNB via the ⁇ antenna, and performs sampling and ADC; the digital signal after C is divided into two signals, one signal is amplified, and the other signal is demodulated.
  • Decoding performing a cyclic redundancy check (CRC) check after decoding, and simultaneously encoding and modulating; then, if a CRC check is passed, analog network coding is performed on the demodulated, decoded, coded, and modulated signals.
  • CRC check the analog network coding is performed on the only amplified signal after sampling and ACD; then the DAC and shaping are performed, and finally the shaped analog signal is forwarded via the antenna.
  • Figure 13 shows a relay receiver and transmitter system with two half-duplex relay stations.
  • the system consists of a base station eNB, a half-duplex relay station 1 and a relay station 2, and user equipment.
  • the two half-duplex relay stations are relayed sequentially over time to transmit the stream from the source and the analog network coded information.
  • Each relay station alternately receives and transmits the signals over the air interface, and the two relay stations shown in Figure 13 continuously carry service data on time-frequency resources.
  • the received signal is analog network encoded at the relay station and then transmitted to the user equipment. It should be understood that in the relay receiver and transmitter system shown in Fig. 13, not limited to the two relay stations shown here, there may be two or more relay stations, or only one relay station.
  • a UE receiver and a detecting method at the time of amplification and forwarding according to an embodiment of the present invention are described below.
  • the relay When amplifying and forwarding data, the relay amplifies with the signal samples and forwards them to the UE, where the transmission in the relay is later than the 'slots' transmitted from the eNB.
  • the UE receiver and detection method will be described below by taking the UE as having two receiving antennas as an example.
  • Fig. 14 is a diagram showing the data transmission at the time of decoding and forwarding using analog network coding in a time slot relay station.
  • ⁇ receives the S1 signal from the eNB in the first time slot
  • the UE receives the S1+S2 signal from the eNB, and is in the
  • the seS suboptimal decoding method is the zero-forcing algorithm ZF plus the minimum mean square error MMSE.
  • FIG. 15 shows a schematic diagram of data transmission for decoding and forwarding of two slot relay stations using analog network coding.
  • the UE receives the S1 signal from the eNB,
  • the UE receives the S1+S2 signal from the eNB, and performs relaying,
  • the signal vector formed by the receiver can be expressed as
  • the optimal decoding method is ML (most approximate), where the receiver compares the full possible combinations of time slots that may have been transmitted with the observed:
  • the suboptimal decoding method is the zero-forcing algorithm ZF plus the minimum mean square error to delete SE.
  • the UE receiver and detection method will be described below by taking a receiving antenna of the UE as an example.
  • the UE may apply joint detection techniques 1): ML detection for de-space multiplexing in base stations and relay stations; or 2) serial interference cancellation (SIC) and detection of existing information from the eNB.
  • ML detection for de-space multiplexing in base stations and relay stations
  • SIC serial interference cancellation
  • the UE receiver and detection method having one receiving antenna will be described below, in which there is only one time slot delay in relaying.
  • the UE receives the S1 signal from the eNB,
  • the UE receives the S1+S2 signal from the eNB,
  • the optimal decoding method is ML (most approximate method), where the receiver will have all possible combinations of time slots that may have been transmitted. The observed comparisons -
  • the simpler decoding methods are serial interference cancellation (SIC) and MMSE (for example, the other is LS or the most approximate ML), using the steps of the MMSE decoding method. as follows:
  • Step 1 H o. (21)
  • Step 2: s 2 MMSE ⁇ s 2 )
  • Step 3: ⁇ + ⁇ , ⁇ , -H n s 2 ) (w 0 H 00 + w 1 H 12 > 1 + n 0
  • Step 4: s, MMSE(s,)
  • step 3: s, MMSE(s,)
  • a UE receiver and detection method having a receiving antenna in which two time slot coding delays are relayed will be described below.
  • the UE receives the S1 signal from the eNB,
  • the power factor k is incorporated into the channel coefficient H.
  • the above equation can be expressed as a matrix product
  • the signal vector y formed by the receiver can be expressed as
  • the optimal decoding method is ML (most approximate), where the receiver compares all possible combinations of time slots that may have been transmitted with the observed: s arg min y - H ⁇ s]
  • the simpler decoding methods are serial interference cancellation (SIC) and implicit SE (for example, the other is LS or ML).
  • SIC serial interference cancellation
  • implicit SE for example, the other is LS or ML.
  • Step 1 00 (32)
  • Step 2: s 2 MMSE ⁇ s 2 ) (33)
  • a relay station performs analog network coding, that is, bearer
  • the traffic data is transmitted using the physical signal of the current time slot/block analog network information encoded by the previous physical signal.
  • the UE receives data from the eNB and relays, and detects the time slot by cooperative MIM0 solution spatial multiplexing MUX or serial interference cancellation; each time the UE only reserves one time slot hard decision, Other existing soft information is used for the next time slot decision, which improves the reception performance of the UE.
  • the UE When decoding and forwarding data, the UE buffers the soft information of one block received from the eNB, and then uses Chase combining or [R combining to obtain the diversity gain after receiving the data from the relay station. Based on analysis in the virtual matrix form theory federated by the eNB and the relay, it is found that joint detection in the receiver can provide at least similar performance to conventional 2*2 transmit diversity. Furthermore, the analog network coding in the relay station of two symbols obtains similar performance to 3 X 3ML 0. The gain is even greater due to the larger SNR received from the relay station.
  • An advantage of the present invention over the best prior art is that joint analog network coding and wireless relay are a new application in wireless communication. Because current HSDPA and LTE, AMC, MAC scheduling, and LI HARQ technologies all focus on high peak data transmission rates when the UE is near the site, the combination of wireless relay and analog network coding is a low-cost, low-complexity solution. The scheme can improve service transmission performance and increase cell coverage when ⁇ at the cell edge.

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Description

联合模拟网络编码的中继方法一、 基站和用户设备 技术领域
本发明涉及无线峰窝网络通信， 具体地涉及高速率宽带无线通信， 例如基于 3GPP LTE的 0F ， 更具体地涉及一种联合模拟网络编码的中继方法， 及其接收和发 射方法和设备。 背景技术
网络编码 (Network coding)从广义上来讲， 是网络中的节点将接收到的信息进 行编码后再转发出去的多点传送 (Multicast)技术。多点传送（也称组播）是网络中的 一种重要的通信方式。 当一个或几个节点同时向若千个其他节点发送数据时， 往往 要借助其他节点的传递。 在传统的网络中， 作为中继的节点只能对接收到的信号进 行复制、 放大和转发， 这对于网络资源有时候是一种浪费。 网络编码技术打破了这 种限制， 它允许中继节点对接收到的信息进行编码， 并将接收到的多个数据包按照 某种特定算法重新组合再发送出去。 网络编码技术可以显著地提高多点传送的数据 率。 在一个网络中传递的信息， 可以形象的称之为 "流" 。 网络的最大流量即为从 源点到收点的最大传输数据率。 而广播的最大流量是指源点同时向所有收点发送同 样数据时， 每个收点能接收到的最大数据传输速率。 理论上讲， 最大流取决于网络 的拓扑结构， 即各节点的连接关系和带宽。 利用图论中著名的最大流最小割定理可 以得到给定网络中某个源点到收点的最大流。 网络编码实际上是用节点处理能力换 取更高的网络效率。
在蜂窝无线通信网络中， 基站具有固定的站点和最大的发射功率。 因此覆盖范 围是不变的， 并且为了改善单元边缘处的用户设备 UE的性能， 执行了一些无线通信 技术， 例如 CDMA系统中的软切换。 伹是在通用移动通信系统 UMTS Rel5 HSDPA和 LTE 中， 没有釆用来自相邻基站的宏分集和功率贡献的软合并， 以便实现独立的更 快和更灵活自适应调制编码 AMC、 MAC调度和 LI HARQo 因此， 当 UE在小区中心时 可以实现更高峰值数据传输率。 但是当 UE远离站点时， 例如在小区边缘， 没有特别 好的技术可以改善服务传输性能以增加谱效率。
在, WiMax中已经引入了无线中继概念，但是在蜂窝网络中还没有讨论过无线中 继概念。 因为本发明在蜂窝网络通信中是新的应用， 目前的现有技术中没有解决方 法。
图 1示出了具有无线中继站的蜂窝网络的配置。作为示例， 中继站位于小区边 缘的 1/3距离处。 中继站可以具有基带处理功能， 并且可以转发来自 eNB的数据。 中继站在与 eNB所使用相同频率的但是与所述源进行时分复用的源上传送数据。
任务中继站可以起这样的作用， 一个是放大和转发数据， 另一个是解码和转发 数据。 具体地， 在图 2和图 3中示出了中继站数据接收和发射的调度。 图 2示出了 在具有无线中继站的通信设备中进行放大和转发时的中继站结构示意图。 如图 2所 示， 中继站经 ώ天线从 eNB接收模拟数据， 并对其进行采样和模数转化 ADC; 对 ADC 后的数字信号进行符号化； 然后对符号化的数字电平进行放大； 最后对放大后的数 字电平进行数模转化和整形， 经由天线转发整形后的模拟信号。 图 3示出了在具有 无线中继站的通信设备中进行编码和转发时的中继站结构示意图。 如图 3所示， 中 继站经由天线从 eNB接收模拟数据， 并对其进行采样和 ADC; 将 ADC后的数字信号 分成两路信号， 一路信号进行如图 2所示的动作， 对符号化的数字电平进行放大， 另一路信号经过解调、 解码， 在解码过后进行循环冗余捡验（CRC)检査， 同时进行 编码和调制； 然后如果通过了 CRC校验， 则对解调、 解码、 编码和调制的这一路信 号进行 DAC和整形， 而如果没有通过 CRC校验， 则对通过采样和 ACD之后只经过放 大的信号进行 MC和整形， 最后经由天线转发整形后的模拟信号。 发明内容
本发明的目的在于提出了一种利用无线中继站联合模拟网编码的蜂窝网络配 置， 即承载来自多个源的信息的物理信号的网络编码， 还公开了发射 /接收方案以及 发射机 /接收机的设计。
根据本发明实施例的第一方面， 提出了一种联合模拟网络编码的中继方法， 用 于具有中继站的蜂窝网络系统中， 包括以下步骤： 从多个基站 eNB接收信息信号； 对 接收到的信号进行釆样和模数转化； 对承载来自多个基站的信息的模拟信号电平进 行模拟网络编码； 对模拟网络编码后的符号进行转发； 以及接收所转发的符号， 将 所述符号转换为信息信号。
优选地， 所述基站 eNB也包括转发数据的在前中继站， 对来自所述基站 eNB和所 述在前中继站的信号进行模拟网络编码。
优选地，所述中继站交替地进行时间分割并且承载模拟网络编码后的信息信号。 优选地， 所述模拟网络编码包括物理信号求和。
优选地， 所述物理信号求和包括对根据时隙划分的信号块进行加权求和。
根据本发明实施例的第二方面，提出了一种联合模拟网络编码中继的接收方法， 用于具有中继站的蜂窝网络系统中， 包括以下步骤- 对来自多个基站 eNB或中继站的信号进行协作的 MIM0操作；
用户设备对通过多输入多输出 MI.M0操作接收到的信号， 通过联合捡测技术进行 解码。
优选地， 所述联合技术包括 M1M0空间解复用。
优选地， 所述联合技术包括串行干扰抵消 STC。
优选地， 所述解码方法是最大概似法 ML。
优选地， 所述解码方法是迫零算法 ZF和最小均方差算法 MMSE。
优选地， 在 UE接收信号之后， 使用追赶合并或递增冗余 IR合并进行解码。
根据本发明实施例的第三方面， 提出了一种基站， 包括： 采样和 ADC单元， 对 待发送的信号进行采样和模数转化； 编码单元， 对承载来自多个基站的信息的模拟 信号电平进行模拟网络编码； 发送单元， 对模拟网络编码后的符号进行转发。
优选地， 所述编码单元通过物理信号求和实现模拟信号编码。
优选地， 所述编码单元通过对根据时隙划分的信号块进行加权求和来实现模拟 信号编码。
根据本发明的第四方面， 提出了一种用户设备 UE， 包括： 接收单元， 用于从基 站接收信息； 解码单元， 通过联合检测技术进行解码； 以及发送单元， 对解码后的 信号进行转发。
优选地， 所述联合技术包括 MIM0空间解复用。
优选地， 所述联合技术包括串行干扰抵消 SIC。
优选地， 所述解码单元使用最大概似法 L进行解码。
优选地， 所述解码单元使用迫零算法 ZF和最小均方差算法丽 SE进行解码。
优选地， 在所述 UE接收信号之后， 所述解码单元使用追赶合并或递增冗余 IR合 并进行解码。
根据本发明的第五方面， 提出了一种计算机可读介质， 其上存储了可执行根据 本发明实施例所述方法的计算机可执行程序。 本发明的有益效果在于： 根据本发明实施例的中继站进行模拟网络编码， 即承 载利用在先物理信号编码的当前时隙 /块模拟网络的信息的物理信号来发射业务数 据。在放大和转发数据时， UE从 eNB接收数据并且进行中继， 并且通过协作的 MIM0 解空间复用 MUX或串行千扰抵消来检测所述时隙； 每次 UE只保留一个时隙硬判决， 其他的现有软信息用于下一次时隙判决， 这改善了 UE的接收性能。在解码和转发数 据时， UE对从 eNB接收到的一个块的软信息进行缓冲， 然后在从中继站接收数据之 后釆用 Cha.se合并或 IR合并以获得分集增益。根据通过 eNB和中继站联合的虚拟矩 阵形式理论中的分析， 发现接收机中的联合检测可以至少提供与传统的 2*2发射分 集类似的性能。此外， 在两个符号的中继站中的模拟网络编码获得与 3 X 3MIM0类似 的性能。 甚至由于从中继站接收到的较大 SNR， 所述增益更大。 本发明与最佳现有 技术相比的优势在于：联合模拟网络编码和无线中继是无线通信中的一种新的应用。 因为当前的 HSDPA和 LTE， AMC、 MAC调度和 LI HARQ技术全部集中在当 UE在站点附 近时的高峰值数据传输率， 无线中继与模拟网络编码的结合是一种低成本低复杂性 的方案，当 UE在小区边缘时，所述方案可以改善业务传输性能，并且增加小区覆盖。
附图说明
根据结合附图的以下描述， 本发明的优点将变得易于理解， 其中- 图 1示出了具有无线中继站的蜂窝网络的配置；
图 2 示出了在具有无线中继站的通信设备中进行放大和转发时的中继站结构 示意图；
图 3 示出了在具有无线中继站的通信设备中进行编码和转发时的中继站结构 示意图；
图 4示出了在 2 X 2协作 M 0方案中的信道响应矢量；
图 5示出了在 2 X 1宏分集方案中的信道响应矢量；
图 6示出了根据本发明实施例的模拟网络编码方法的流程图；
图 7示出了 UE接收机的物理处理结构， 其中是使用协作 解空间复用的 L1结构；
图 8示出了 UE接收机的物理处理结构， 其中是使用 SIC的 结构； 图 9a和图 9b示出了使用模拟网络编码的放大和转发时的数据传输； 图 10a和图 10b示出了使用模拟网络编码的解码和转发时的数据传输的示意 图；
图 11示出了利用模拟网络编码在具有无线中继站的通信设备中进行数据放大 和转发时的示意图；
图 12示出了利用模拟网络编码在具有无线中继站的通信设备中进行编码和转 发时的中继站结构示意图；
图 13示出了具有两个半双工中继站的中继接收机和发射机系统；
图 14示出了一个时隙中继站中使用模拟网络编码的解码和转发时的数据传输 的示意图； 以及
图 15示出了两个时隙中继站的使用模拟网络编码的解码和转发时的数据传输 的示意图。 具体实施方式
现在对本发明的实施例提供详细参考。 为解释本发明将参考附图描述下述实施 例。
在本发明中， 提出了一种联合模拟网编码和无线中继配置。两个中继站交替进 行时间分割， 以与模拟网络编码信息一起发射来自源的流量， 即承载具有在先编码 的当前时隙的模拟网络的信息的物理信号。 在终端接收机中， 可以应用串行干扰抵 消以及来自基站的在前信息的检测。 如果存在多于一根接收机天线， 可以应用基站 和中继站中的协作 M 0， 其中把现有信息作为一个分支。 根据在通过 eNB和中继站 联合的信道矩阵形式的理论分析， 发现接收机中的联合检测可以至少提供与传统的 2 X 2发射分集类似的性能。 此外， 在两个符号的中继站中的模拟网络编码获得了 3 X 3MI M0的类似性能。 但是， 由于从中继站接收到的较大 SNR, 实际上增益更大。
在具有中继站的系统中对模拟信号应用模拟网络编码方法，其中所述模拟信号 信号承载了来自多个源的信息。所述 UE可以应用联合检测技术： 基站和中继站中的 协作 空间解复 ffl。 图 4示出了在 2 X 2协作 M0方案中的信道响应矢量。 图 5 示出了在 2 X 1宏分集方案中的信道响应矢量。
图 6示出了根据本发明实施例的联合模拟网络编码的中继方法的流程图。 如图 6 所示， 所述方法包括以下步骤： 从多个基站 eNB接收信息； 对接收到的信息进行釆样 和模数转化； 对承载来自多个基站的信息的数字化的模拟信号电平进行模拟网络编 码； 对网络编码后的符号进行转发； 以及接收所转发的符号， 将所述符号转换为信 息信号。
其中所述模拟网络编码指得是物理信号的求和， 也就是说模拟信号层次的信号 编码。所述物理信号求和包括对根据时隙划分的信号块进行加权求和。所述基站 eNB 也可以包括转发数据的在前中继站，对来自所述基站 eNB和所述在前中继站的信号进 行模拟网络编码。 所述中继站交替地进行时间分割并且承载模拟网络编码后的信息 根据本发明的另一个实施例， 联合模拟网络编码中继的接收方法， 用于具有中. 继站的蜂窝网络系统中， 包括以下歩骤： 对来自多个基站 eNB或中继站的信号进行协 作的 MTM0操作； 用户设备对通过多输入多输出 MIM0操作接收到的信号， 通过联合检 测技术进行解码。 其中所述联合技术包括 MIM0空间解复用。 所述联合技术包括串行 干扰抵消 S i'C。所述解码方法可以是最大概似法 ML, 也可以是迫零算法 ZF和最小均方 差算法 MMSE。 在 UE接收信号之后， 使用 Chase合并或递增冗余 IR合并进行解码。
根据本发明的另一个实施例， 基站包括： 采样和 ADC单元， 对待发送的信号进行 采样和模数转化； 编码单元， 对承载来自多个基站的信息的模拟信号电平进行模拟 网络编码； 发送单元， 对模拟网络编码后的符号进行转发。 其中， 所述编码单元通 过物理信号求和实现模拟信号编码。 所述编码单元通过对根据时隙划分的信号块进 行加权求和来实现模拟信号编码。
根据本发明的另一个实施例， 用户设备 UE, 包括： 接收单元， 用于从基站接收 信息； 解码单元， 通过联合检测技术进行解码； 以及发送单元， 对解码后的信号进 行转发。 其中所述联合技术包括 MIM0空间解复用。 所述联合技术包括串行干扰抵消
SIC。所述解码单元可以使用最大概似法 ML进行解码， 也可以使用迫零算法 ZF和最小 均方差算法 MMSE进行解码。在所述 UE接收信号之后， 所述解码单元使用 Chase合并或 递增冗余 IR合并进行解码。
下面参考图 7和图 8解释与图 4和图 5所对应的信道响应矢量在应用了模拟网 络编码之后的解码和转发时的 UE接收机和检测方法。
图 7示出了 UE接收机的物理处理结构，其中使用 WM0空间解复用的 L1结构， 用户设备 UE具有两根天线。 如图 6所示， 在解码和转发数据时， 中继站对信号样本 进行解码， 并且进行循环冗余校验 CRC检查， 然后对数据重新编码并且转发至 UE， 其中中继站中的发射是比 eNB发射晚一个时隙的延迟。接收端的用户设备 UE可以对 从基站 eNB和中继站中接收到的数据信号应用 MIM0空间解复用。 UE对从 eNB接收 到的一个块的软信息进行缓冲， 然后在从中继站接收所述数据之后采用 Chase合并 或 IR合并， 以获得分集增益。
图 8示出了 UE接收机的物理处理结构， 其中是使用 SIC的 L1结构， 用户设备 UE具有 根天线。如阁 7所示，另外，所述接收端的 UE可以应用串行干扰抵消（SIB) 以及与来自 eNB的现有信息的检测。
图 9a和图 9b示出了使用模拟网络编码的放大和转发时的数据传输。 如图 9a 和图 9b所示， 以两个中继站为例解释在放大和转发数据时的数据中继。 中继站放大 所述信号样本， 并且将其转发至 UE, 其中中继站中的发射比从 eNB发射的多一个时 隙延迟。 图 9a中， 中继站 1只放大和转发奇数的数据， 中继站 2只放大和中继偶数 数据,并且中继站对数据进行的延迟时长是一个时隙 ( slot)o而在图 9b中， 中继站 1按照 kSi+ (卜 k) Sw (i_:0， 1, 2···)进行编码， 中继站 2按照 kS,+ (1-1 5^ , ( 1=0, 1 , 2-) 进行编码， 其中， 0<k〈l是两个编码系统的功率因子； 并且在图 9b中， 中继站对数 据进行编码的延迟时长是两个时隙。 应该理解的是， 编码方法不局限于此， 任何模 拟网络编码方法均可以应用于在中继站中对数据进行放大和转发中，如系数定义为 kl和 k2并为复数， 或者是超过两个的符号的网络编码。 在图 9b所示的两个时隙编 码中继站可以使用多于一个在前时隙的现有信息 （软判决信息） 以进行检测。 由于 eNB和中继站之间的空间复用， UE应该应用联合检测技术。 其中所述联合检测方法 1是： 基站和中继站中的协作 Μ1Έ0解空间复用和与来自 eNB的现有信息的检测； 所 述联合捡测方法 2是： 串行千扰抵消和与来自 eNB的现有信息的检测。
图 10a和图 10b示出了使用模拟网络编码的解码和转发时的数据传输的示意 图。 如图 10a和图 10b所示， 以两个中继站为例解释在放大和转发数据时的数据中 继。 在解码和转发数据时， 中继站对所述信号样本解码， 并且进行 CRC检査， 然后 对数据重新编码并且转发至 UE， 其中中继站中发射的数据块比从 eNB发射的数据块 晚两个数据块的延迟。
同样， 接收机可以在基站和中继站中应用 MIM0解空间复用。 UE接收机对一个 块中的软信息进行缓冲， 并且在从中继站接收数据之后采用 Chase合并或 IR合并。 另外， 接收机可以应用串行干扰抵消以及来自 eNB的现有信息的检测。
在该发明中， 中继站节点的存在可以不影响 eNB的操作， 例如 AMC、 MAC调度 和 L1 HARQ。 eNB不会在意是否存在中继节点， 以及不存在从中继站到 eNB的上行链 路， 并且控制信令直接在 eNB和 UE之间传送。所述中继站只接收业务数据并且将其 转发至 UE, 但可以理解其它方式的控制信令的设计不影响本发明的实施。
图 11示出了利用模拟网络编码在具有无线中继站的通信设备中迸行数据放大 和转发时的示意图。 如图 11所示， 中继站经由天线从 eNB接收模拟数据， 并对其进 行采样和模数转化 ADC; 对 ADC后的数字信号进行符号化； 然后对符号化的信号进 行放大； 对放大后的信号进行模拟网络编码； 最后对模拟网络编码的信号进行数模 转化和整形， 经由天线转发整形后的模拟信号， 实现了巾继站中的数据放大和转发。
图 12示出了利用模拟网络编码在具有无线中继站的通信设备中进行编码和转 发时的中继站结构示意图。 如图 12所示， 中继站经 ώ天线从 eNB接收棋拟数据， 并 对其进行釆样和 ADC; 将 )C后的数字信号分成两路信号， 一路信号进行放大， 另 一路信号经过解调、 解码， 在解码过后进行循环冗余检验（CRC)检查， 同时进行编 码和调制； 然后如果通过了 CRC校验， 则对解调、 解码、 编码和调制的这一路信号 进行模拟网络编码而如果没有通过 CRC校验， 则对通过采样和 ACD之后只经过放大 的信号进行模拟网络编码； 然后进行 DAC和整形， 最后经由天线转发整形后的模拟 信号。
图 13示出了具有两个半双工中继站的中继接收机和发射机系统。 所述系统由 基站 eNB、 半双工中继站 1和中继站 2、 以及用户设备组成。 如图 13所示， 两个半 双工中继站随着时间分割依次进行中继以发射来自源的流和模拟网络编码信息。 每 一个中继站通过空中接口交替地接收和发射所述信号，并且如图 13所示的两个中继 站在时间-频率资源上连续地承载业务数据。在所述中继站对接收到的信号进行模拟 网络编码， 然后发送给用户设备。应该理解的是， 在图 13所示的中继接收机和发射 机系统中， 不局限于这里所示的两个中继站， 可以存在两个以上的中继站， 也可以 是只有一个中继站。
下面描述根据本发明实施例的放大和转发时的 UE接收机和检测方法。 在放大 和转发数据时， 中继站随信号样本进行放大并且将其转发至 UE， 其中中继站中的发 射比从 eNB发射的晚 '个时隙。 下面以 UE具有 2根接收天线为例对所述 UE接收机 和检测方法进行描述。
图 14示出了一个时隙中继站中使用模拟网络编码的解码和转发时的数据传输 的示意图。 ，
首先, ϋΕ在第一时隙中从 eNB中接收 S1信号， 令
Figure imgf000011_0001
其次， UE从 eNB接收 S1+S2信号, 并且在第
y] = Hns2-\-Hns +n
(2) y2 = H2 2 + H22s + n2 以上等式可以表达为矩阵乘积：
Figure imgf000011_0002
令^ (4)
Figure imgf000011_0003
接收机形成的信号矢量 y可以表达为：
y = Hs + n (5) 最优的解码方法是 ML (最大概似法）， 其中所述接收机已经发射的时隙的全部 可能组合与所观察到的进行比较： s = argmin y-H s (6) seS 次优的解码方法是迫零算法 ZF加上最小均方差 MMSE。
但是在该时隙中，只有 是硬判决。即，只对 进行转化为数字信号的硬判决， 其他信号不经过判决， 合并在一起进行模拟网络编码。
0)
至少， 令 W = w' ― H、 、 ) + w2 (y2 - H22s )=(w,Hn + w2H2] )s2 +n0 ( 7〉 将其用于下一个时隙判决。 这.単.应用最大比合并 MRC 作为这里使用的接收机 图 15示出了两个时隙中继站的使用模拟网络编码的解码和转发时的数据传输 的示意图。
首先， 在第一时隙中， UE从 eNB接收 S1信号， 令
y0 = Ηοο^ + n0 (8) 其次， 在第二时隙中， UE从 eNB接收 S1+S2信号， 并且进行中继， 令
(9) =H +H +"2 再次， 在第三时隙中， UE从 eNB接收 S1+S2+S3信号， 并且进行中继， 令
(10) y4 =H +H¾ +"4
+ (11) )
Figure imgf000012_0004
Figure imgf000012_0001
— 令
Figure imgf000012_0002
Figure imgf000012_0005
Figure imgf000012_0006
接收机形成的信号矢量 可以表达为
y = Hs + n (13) 最优的解码方法是 ML (最大概似法）， 其中接收机将可能已经发射的时隙的全 可能组合与所观察到的进行比较：
Figure imgf000012_0003
次优的解码方法是迫零算法 ZF加上最小均方差删 SE。
但是在该时隙中， 只有 是硬判决的， 包括 和 的现有信息的其他时隙用于 下一次时隙判决。
下面以 UE具有一根接收天线为例对所述 UE接收机和检测方法进行描述。 在 这种情况下， UE 可以应用联合检测技术 1): 对于基站和中继站中的解空间复用的 ML检测； 或者 2) 串行干扰抵消 （SIC) 以及与来自 eNB的现有信息的检测。
下面描述具有一根接收天线的 UE接收机和检测方法， 其中中继时只有一个时 隙延迟。
首先， 在第一时隙中， UE从 eNB接收 S1信号， 令
y0 = H00^ + n0 (15) 其次， 在第二时隙中， UE从 eNB接收 S1+S2信号, 令
yx = Hus2 +Husx +n,
(16) 以上等式可以表达为矩阵乘积 瞧¾ .
Figure imgf000013_0001
y (17)
H
y
令
Figure imgf000013_0002
(18) 接收机形成的信号矢量 y可以表达为- y = Hs + n (19) 最优解码方法是 ML (最大概似法）， 其中接收机将可能已经发射的时隙的全部 可能组合与所观察到的进行比较-
(20) 因为信道响应矩阵是下三角矩阵， 更简单的解码方法是串行干扰抵消 （SIC) 和 MMSE (例如， 另一种是 LS或最大概似法 ML), 利用 MMSE的解码方法的步骤如下:
12
^0 = ^11^2 + «1
步骤 1: Ho。 (21) 歩骤 2: s2 =MMSE{s2) (22) 步骤 3: ^^^οΛ+^,^, -Hns2)=(w0H00 + w1H12>1 +n0 (23) 歩骤 4: s, =MMSE(s,) (24) 在步骤 3中应用最大比合并 MR (：。 在该时隙中， 只保留 的硬判决。
至少， 令 I - = 2 +"ι (25) 将其用于下一次时隙判决。
下面描述具有一根接收天线的 UE接收机和检测方法， 其中中继时具有两个时 隙编码延迟。
首先， 在第一时隙中， UE从 eNB接收 S1信号， 令
Q = Hoos\ + ηο (26) 其次， 在第二时隙中， UE从 eNB接收 S1+S2信号并且对其进行中继， 图中 SO 是常数 1， 令 y =H^s2 +H^sx +n, (27) 再次， 在第三时隙中， UE从 eNB接收 S1+S2+S3信号并且对其进行中继， 令
Figure imgf000014_0001
其中将功率因子 k合并到信道系数 H中。 以上等式可以表达为矩阵乘积
Figure imgf000014_0004
Figure imgf000014_0005
Figure imgf000014_0002
Figure imgf000014_0006
接收机形成的信号矢量 y可以表达为
y = Hs + n (31) 最优解码方法是 ML (最大概似法）， 其中接收机将可能已经发射的时隙的全部 可能组合与所观察到的进行比较： s arg min y - H · s]
seS
因为信道响应矩阵是下三角矩阵， 更简单的解码方法是串行干扰抵消 （SIC) 和隱 SE (例如， 另一种是 LS或 ML)， 利用 MMSE的解码方法的歩骤如下：
H,
歩骤 1: 00 (32) 步骤 2: s2 =MMSE{s2) (33) 步骤 3:
Figure imgf000014_0003
(34)
■ MMSE(s3)
步骤 4: (35) 骤 5 : z = Wt) 。 + wi (^i― )= (^。 。。 + ^H^ , + ¾ (36) 步骤 6: = MMSE、s、、 (37) 在歩骤 5中应用 MRC。 在该时隙中， 只保留 的硬判决， 将包括 和 的其他 硬判决用于下一个时隙判决。
本发明的商用价值： 根据本发明实施例的中继站进行模拟网络编码， 即承载利 用在先物理信号编码的当前时隙 /块模拟网络的信息的物理信号来发射业务数据。在 放大和转发数据时， UE从 eNB接收数据并且进行中继， 并且通过协作的 MIM0 解空 间复用 MUX或串行干扰抵消来检测所述时隙； 每次 UE只保留一个时隙硬判决， 其他 的现有软信息用于下一次时隙判决，这改善了 UE的接收性能。在解码和转发数据时， UE对从 eNB接收到的一个块的软信息进行缓冲， 然后在从中继站接收数据之后釆用 Chase合并或【R合并以获得分集增益。 根据通过 eNB和中继站联合的虚拟矩阵形式 理论中的分析， 发现接收机中的联合检测可以至少提供与传统的 2*2发射分集类似 的性能。此外，在两个符号的中继站中的模拟网络编码获得与 3 X 3ML 0类似的性能。 甚至由于从中继站接收到的较大 SNR， 所述增益更大。
本发明与最佳现有技术相比的优势在于：联合模拟网络编码和无线中继是无线 通信中的一种新的应用。 因为当前的 HSDPA和 LTE, AMC、 MAC调度和 LI HARQ技术 全部集中在当 UE在站点附近时的高峰值数据传输率，无线中继与模拟网络编码的结 合是一种低成本低复杂性的方案， 当 ϋΕ在小区边缘时， 所述方案可以改善业务传输 性能， 并且增加小区覆盖。
尽管已经示出和描述了本发明的一些实施例，但本领域普通技术人员应当理解， 在不脱离所附权利要求及其等价物所限定的本发明的原理和范围的情况下， 可以在 对以上实施例中做出变化。

Claims

权 利 要 求—
I . 一种联合模拟网络编码的中继方法， 用于具有中继站的蜂窝网络系统中， 包 括以下歩骤. - 从多个基站 eNB接收信息信号；
• 对接收到的信号进行采样和模数转化；
对承载来自多个基站的信息的模拟信号电平进行模拟网络编码；
对模拟网络编码后的符号进行转发； 以及
接收所转发的符号， 将所述符号转换为信息信号。
2.根据权利要求 1所述的方法，其中所述基站 eNB也包括转发数据的在前中继站， 对来自所述基站 eNB和所述在前中继站的信号进行模拟网络编码。
3. 根据权利要求 1所述的方法， 其中所述中继站交替地进行时间分割并且承载 模拟网络编码后的信息信号。
4. 根据权利要求 1所述的方法， 其中所述模拟网络编码包括物理信号求和。
5. 根据权利要求 4所述方法， 其中所述物理信号求和包括对根据时隙划分的信 号块进行加权求和。 ·
6. - 种联合模拟网络编码中继的接收方法，用于具有中继站的蜂窝网络系统中， 包括以下歩骤：
对来自多个基站 eNB或中继站的信号进行协作的 MM0操作；
用户设备对通过多输入多输出 MIM0操作接收到的信号， 通过联合检测技术进行 解码。
7. 根据权利要求 6所述的方法， 其中所述联合技术包括 MIM0空间解复用。
8. 根据权利要求 6所述的方法， 其中所述联合技术包括串行干扰抵消 SIC。
9. 根据权利要求 6所述的方法， 其中所述解码方法是最大概似法 ML。
10. 根据权利要求 6所述的方法， 其中所述解码方法是迫零算法 ZF和最小均方差 算法丽 SE。
II . 根据权利要求 6所述的方法， 其中在 UE接收信号之后， 使用追赶合并或递增 冗余 IR合并进行解码。
12. 一种基站， 包括：
釆样和 ADC单元， 对待发送的信号进行采样和模数转化； 编码单元， 对承载来自多个基站的信息的模拟信号电平进行模拟网络编码 发送单元， 对模拟网络编码后的符号进行转发。
13. 根据权利要求 12所述的基站， 其中所述编码单元通过物理信号求和实现糢 拟信号编码。
14. 根据权利要求 12所述的基站， 其中所述编码单元通过对根据时隙划分的信 号块进行加权求和来实现模拟信号编码。
15. 一种用户设备 UE， 包括- 接收单元， 用于从基站接收信息；
解码单元， 通过联合检测技术进行解码； 以及
发送单元， 对解码后的信号进行转发。
16. 根据权利要求 15所述的用户设备，其中所述联合技术包括 ΜΪΜ0空间解复用。
17. 根据权利要求 15所述的设备， 其中所述联合技术包括串行干扰抵消 SIC。
18. 根据权利要求 15所述的方法， 其中解码单元使用最大概似法 ML进行解码。
19. 根据权利要求 15所述的方法， 其中所述解码单元使用迫零算法 ZF和最小均 方差算法丽 SE进行解码。
20. 裉据权利要求 15所述的方法， 其中在所述 UE接收信号之后， 所述解码单元 使用追赶合并或递增冗余 IR合并进行解码。
21. - 种计算机可读介质， 其上存储了可执行根据权利要求 1至 11所述方法的计 算机可执行程序。
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