CN102474335B - Method and apparatus for data relay and data decoding - Google Patents

Abstract

The present invention provides a method and device for forwarding multiple packets from multiple user terminals in a relay station, and a method and device for decoding the multiple packets in a base station. The relay station performs joint modulation-based network coding processing or simulated network coding processing on multiple packets from multiple user terminals, and forwards the joint modulation-based network coding packets or simulated network coding packets to the base station. The base station receives multiple packets from multiple user terminals and joint modulation based network coding packets or analog network coding packets from the relay station, and performs joint soft combining decoding on them. The present invention can effectively save the uplink spectrum resource of the link section from the relay station to the base station, reduce the power consumption in the relay station, and simultaneously improve the forwarding efficiency of the relay station and maintain better receiving performance.

Description

Method and device for data relay and data decoding

technical field

The present invention relates to a wireless communication system, and more specifically relates to a method for transmitting data by using a relay in a wireless communication system and corresponding equipment, which can effectively save uplink wireless spectrum resources and reduce power consumption of a relay station. At the same time, it can also improve the forwarding efficiency of the relay station and maintain better receiving performance.

Background technique

In LTE-A wireless communication network, relay is an important technical means to support system expansion and expand coverage. In the uplink of an LTE-A wireless communication network, it is generally necessary to relay information from multiple user terminals UE. The traditional relay method is to forward the information of multiple user terminals one by one.

For example, as shown in FIG. 1 , relay station 21 relays packets P1 and P2 respectively from user terminals 11 and 12 to eNodeB 31 respectively. For the two packets P1 and P2, the relay station 21 still needs to use resources equivalent to the length of the two packets to carry them. In a TDM system, when the number of served UEs increases, the one-by-one forwarding mode shown in FIG. 1 will bring a longer delay. In an FDM system, the one-by-one forwarding method shown in Figure 1 requires a large amount of spectrum resources. Since in a wireless communication network, radio resources of a communication link are extremely limited, it is necessary to adopt some schemes for saving radio resources for relaying.

In the PCT international application submitted by the applicant on April 27, 2009, an XOR network coding scheme for multi-user relay and a soft combination scheme for eNB are proposed. As shown in Fig. 2, by means of XOR network coding, one XORed bit is used to represent 2 bits from 2 UEs, which can save 50% forwarding resources, but the receiving performance is not very good. Therefore, there is a need for a more efficient forwarding method that can take into account the receiving performance.

Contents of the invention

On the basis of the background technology, the present invention proposes a technical solution for forwarding multiple packets from multiple user terminals in the relay station, and performs joint soft combining and decoding on the multiple packets from the user terminals in the base station technical solutions.

According to an aspect of the present invention, a method for forwarding a packet from a user terminal in a relay station of a wireless communication network is proposed, comprising the following steps: receiving a plurality of packets respectively from a plurality of user terminals; performing network coding processing based on joint modulation on multiple packets to obtain a network coding group based on joint modulation; and sending the network coding group based on joint modulation to the base station.

According to another aspect of the present invention, a method for forwarding a packet from a user terminal in a relay station of a wireless communication network is proposed, comprising the following steps: receiving a plurality of packets respectively from a plurality of user terminals; performing simulated network coding processing on the plurality of packets to obtain a simulated network coding group; and sending the simulated network coding group to the base station.

According to yet another aspect of the present invention, a method for decoding packets from user terminals in a base station of a wireless communication network is proposed, comprising the steps of: receiving a plurality of packets respectively from a plurality of user terminals and from a relay station network coding group based on joint modulation, wherein the network coding group based on joint modulation is obtained after performing network coding processing based on joint modulation on the plurality of packets respectively received by the relay station; The packet and the network coding packet based on joint modulation are jointly soft-combined and decoded.

According to yet another aspect of the present invention, a method for decoding packets from user terminals in a base station of a wireless communication network is proposed, comprising the steps of: receiving a plurality of packets respectively from a plurality of user terminals and from a relay station The simulated network coding group, wherein the simulated network coding group is obtained after performing simulated network coding processing on the multiple packets respectively received by the relay station; and the multiple packets and the simulated network coding based The packets undergo joint soft-combining decoding.

The present invention can effectively save the uplink spectrum resource of the link section from the relay station to the base station, reduce the power consumption in the relay station, and simultaneously improve the forwarding efficiency of the relay station and maintain better receiving performance.

Description of drawings

The above objects, advantages and features of the present invention will become apparent by referring to the following detailed description of preferred embodiments employed in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of a network topology structure of a traditional multi-user uplink relay;

FIG. 2 is a schematic diagram of a network topology structure of an existing multi-user uplink relay using XOR network coding;

FIG. 3 is a schematic diagram of packet forwarding by a relay station in a wireless communication network according to an embodiment of the present invention;

FIG. 4 shows a flowchart of a method for forwarding packets from multiple user terminals in a relay station according to a first embodiment of the present invention;

FIG. 5 shows a flowchart of a substep of step S403 in the case of Example 1 according to the first embodiment of the present invention;

Fig. 6 shows the 16QAM constellation diagram in the current non-patent document 36.211;

FIG. 7 shows a constellation diagram customized for 16QAM according to the first embodiment of the present invention;

FIG. 8 shows a flowchart of a method for decoding a packet from a user terminal in an eNB according to Example 1 of the first embodiment of the present invention;

FIG. 9 shows a flowchart of substeps of step S803 in Example 1 according to the first embodiment of the present invention;

Fig. 10 shows a schematic block diagram of decoding in eNB in Example 1 according to the first embodiment of the present invention;

FIG. 11 shows a flow chart of a substep of step S403 in the case of Example 2 according to the first embodiment of the present invention;

FIG. 12 shows a structural block diagram of a forwarding device 1200 for forwarding packets from multi-user terminals in a relay station of a wireless communication network according to a first embodiment of the present invention;

Fig. 13 shows a schematic structural diagram of a decoding device 1300 for decoding a packet from a user terminal in an eNB of a wireless communication network according to a first embodiment of the present invention;

FIG. 14 shows a flow chart of a method for forwarding packets from multiple user terminals in a relay station according to a second embodiment of the present invention;

FIG. 15 shows a flow chart of a substep of step S1403 in the case of Example 3 according to the second embodiment of the present invention;

Figure 16 shows a constellation diagram corresponding to the mapping table shown in Table 2;

FIG. 17 shows a flow chart of a substep of step S1403 in the case of Example 4 according to the second embodiment of the present invention;

FIG. 18 shows a structural block diagram of a forwarding device 1800 for forwarding packets from multi-user terminals in a relay station of a wireless communication network according to a second embodiment of the present invention;

FIG. 19 shows a schematic structural diagram of a decoding apparatus 1900 for decoding a packet from a user terminal in an eNB of a wireless communication network according to a second embodiment of the present invention; and

FIG. 20 shows simulation curves of packet error rates corresponding to the four relay schemes according to the present invention.

Detailed ways

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 3 is a schematic diagram of a forwarding scheme of the relay station 300 of the present invention. It should be noted that only two user terminals 301 and 302 are shown in FIG. 3 , and those skilled in the art should understand that the technical solution of the present invention is not limited to two user terminals, but is applicable to multiple case of a user terminal. As can be seen from Fig. 3, the difference between the forwarding scheme of the present invention and the relaying scheme mentioned in the background part is that the present invention adopts the Joint Modulation Network Coding (JM NC) scheme and the Analog Network Coding (ANC) scheme different from XOR network coding. )plan.

The first embodiment and the second embodiment will be enumerated below to specifically illustrate the joint modulation network coding scheme and the analog network coding scheme of the present invention.

[first embodiment]

Fig. 4 shows a flowchart of a method for forwarding packets from multiple user terminals in a relay station according to the first embodiment of the present invention.

As shown in FIG. 4, in step 401, the relay station receives multiple packets from multiple user terminals respectively. In step 403, the relay station performs joint modulation-based network coding processing on the multiple packets to obtain a joint modulation-based network coding packet. In step 405, the relay station sends the network coding packet based on joint modulation to the eNB.

In the field of wireless communication, existing relays are single-packet forwarding, which are divided into amplify and forward (AF) relay mode and decode and forward (DF) relay mode. In the following, the network coding process based on joint modulation in step S403 in FIG. 4 will be specifically described by taking AF relay and DF relay scenarios as examples.

Example 1: Multi-User Uplink Joint Modulation (MUJM) DF Relay

FIG. 5 shows a flowchart of a substep of step S403 in the case of Example 1 according to the first embodiment of the present invention.

As shown in Fig. 5, in step S501, the relay station demodulates and decodes the multiple packets. In step S503, the relay station judges whether all the multiple packets are decoded correctly. In this embodiment, the relay station performs the above judgment through CRC check. In the case that the multiple packets are all decoded correctly, the relay station performs channel coding on the multiple packets (step S505), and then performs joint modulation (step S507). If there is at least one packet that is not decoded correctly, then there is no point in performing joint modulation, in which case the relay station switches to the mode of conventional AF relay. That is to say, the relay station still amplifies and forwards the received packets one by one.

The specific mapping manner of the joint modulation in step S507 will be described below with reference to FIG. 6 and FIG. 7 .

In order to be compatible with the LTE-A system, it is necessary to consider the modulation type of the LTE-A data channel, namely QPSK, 16QAM and 64QAM. Two QPSK symbols can be jointly modulated into one 16QAM symbol. A QPSK symbol and a 16QAM symbol can be jointly modulated into a 64QAM symbol.

Next, take two QPSK symbols jointly modulated into one 16QAM symbol as an example for illustration.

FIG. 6 shows the 16QAM constellation diagram in the current non-patent document 3GPP TS36.211. It can be seen from the figure that the first two bits indicate the quadrant, and the last two bits indicate the specific position in the quadrant. For example, in the application scenario shown in FIG. 3 , the bits from two UEs are concatenated, and the bits from UE1 are modulated into the first two bits. It can be clearly seen from FIG. 6 that UE1 will have better performance than UE2, and the performance gap between UE1 and UE2 is too great.

Therefore, a more appropriate mapping method should be adopted for joint modulation. In order for the bits from both UEs to have comparable performance, the constellation diagram should be rearranged. As shown in FIG. 7 , the bits from UE1 are distributed along the x-axis, and the bits from UE2 are distributed along the y-axis. In this case, UE1 and UE2 have the same performance.

Table 1 shows a joint modulation mapping table corresponding to the constellation diagram in FIG. 7 . In order to jointly modulate the bits from 2 UEs into a custom constellation as shown in Figure 7 while conforming to the LTE constellation, it is first necessary to map the bits from the 2 UEs to the constellation in column 5 of Table 1 The corresponding bits are then modulated according to the LTE constellation diagram. The specific mapping relationship is shown in Table 1.

Table 1: Joint modulation mapping table

Actually, constellation mapping patterns are not limited to this. In other cases, the mapping principle can be designed in a similar manner.

Fig. 8 shows a flowchart of a method in an eNB for decoding a packet from a user terminal according to Example 1 of the first embodiment of the present invention.

The process of decoding the packet from the user terminal 11 or 12 by the eNB31 in FIG. 3 will be described in detail below with reference to FIG. 3 and FIG. 8 .

First, in step S801 , eNB31 receives the network coding packet based on joint modulation from relay station 21 , and packets P1 and P2 from user terminals 11 and 12 respectively. Among them, the network coding packet based on joint modulation from the relay station 21 is the two packets P1 and P2 from the user terminals 11 and 12 respectively received by the relay station 21 after performing the network coding processing based on joint modulation as shown in FIG. 4 income.

Usually, eNB 31 first receives packets P1 and P2 from user terminals 11 and 12 respectively due to processing delay in relay station 21 . It should be noted that the same packet P1 or P2 received by the relay station 21 and eNB31 may be different due to the difference in the wireless communication link from the user terminal 11 or 12 to the relay station 21 and from the user terminal 11 or 12 to the eNB31. For example, because the relay station 21 is closer to the user terminal 11 or 12, the received packet P1 or P2 may be completely correct; and because the eNB31 is farther away from the user terminal 11 or 12, the received packet P1 or P2 may be completely correct. There will be errors. After receiving a single packet of the direct link, the eNB demodulates the single packet and performs channel decoding. If the channel decoding can be performed correctly, it does not need to perform soft combination with the network coding packet.

It should be noted that those of ordinary skill in the art should be able to understand that specifically, the sending methods of the packets P1 and P2 can be time division, code division, frequency division, space division, etc., because the sending methods of the groups are not directly related to the present invention. relationship, the present invention will not go into details here.

Then, in step S803, perform joint soft combining decoding on the packets P1 and P2 from the user terminal and the network coding packet based on joint modulation.

Fig. 9 shows a flowchart of sub-steps of step S803 in Example 1 according to the first embodiment of the present invention.

First, in step S901 , the eNB31 soft-combines the respective soft information of the plurality of packets and the soft information of the network coding packet based on joint modulation.

First, eNB31 obtains the respective soft information of the plurality of packets and the soft information of the simulated network coded packet, where the soft information refers to the log likelihood ratio (LLR) corresponding to each coded bit in each packet the sequence of.

The calculation process of the log-likelihood ratio of a coded bit will be described in detail below.

Assuming that a symbol in the packet P1 sent by the user terminal 11 is s ₁ , then the symbol received by the eNB31 is y ₁ :

y ₁ =h ₁ ·s ₁ +n ₁ (1)

Among them, _h1 is the channel transmission coefficient from user terminal 11 to eNB31, _n1 is the noise with variance ^σ2 normally distributed, then the likelihood ratio of symbol _s1 is:

$\mathrm{<span\; class="notranslate">\; LLR</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span><span\; class="notranslate">\; -</span>\frac{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="h"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">h</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, s _1i is all possible values of symbol s ₁ . For example, for QPSK symbols, i=1˜4.

Then, the bit likelihood of bit j in symbol _s1 is calculated by expression (3):

$\mathrm{<span\; class="notranslate">\; LLR</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}\frac{\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}\frac{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span>}{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}\frac{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; LLR</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; ;</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; j</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; exp</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; LLR</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Wherein, i and k are the bits contained in each symbol. For example, for QPSK symbols, i and k=1~2.

Then, the sequence of bit LLRs is input to the channel decoder. If the channel decoding of the two packets is correct, for example, the CRC check result is correct, the data bit sequences of P1 and P2 after channel decoding are stored without further soft combining processing. If the channel decoding of any packet (for example, packet P1) is incorrect, soft combining processing needs to be performed on the packet P1.

In the second time slot, the eNB performs the same processing on P2. In the third time slot, the joint modulation symbol s _NC in the network coding packet PNC based on joint modulation received by the eNB is shown in the expression (4)

y _NC = h _{R, B} s _NC + n _{R, B} (4)

In order to soft combine the information about P1, take the first bit b ₁ in P1 as an example, according to the definition of LLR _b in the MAP (Maximum a Posterior, maximum a posteriori probability) criterion $\widetilde{\mathrm{LLR}}\left(b_1\right)=\log \frac{P[{\mathrm{<figure-callout\; id="1"\; label="b"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">b</figure-callout>}}_1=1|{\mathrm{the\; y}}_{\mathrm{NC}}]}{P[{\mathrm{<figure-callout\; id="1"\; label="b"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">b</figure-callout>}}_1=0|{\mathrm{the\; y}}_{\mathrm{NC}}]}=\log \frac{P[{\mathrm{<figure-callout\; id="1"\; label="b"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">b</figure-callout>}}_1=1,{\mathrm{the\; y}}_{\mathrm{NC}}]}{P[{\mathrm{<figure-callout\; id="1"\; label="b"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">b</figure-callout>}}_1=0,{\mathrm{the\; y}}_{\mathrm{NC}}]}$ Make a soft mix.

After receiving a single packet and a network-coded packet based on joint modulation, the LLR _b -sequence can be calculated as follows

$\stackrel{<span\; class="notranslate">\; ~</span>}{\mathrm{<span\; class="notranslate">\; LLR</span>}}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}\frac{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; JM</span>}}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; [</span>{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ]</span>}{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; JM</span>}}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="y"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">y</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; ]</span>\mathrm{<span\; class="notranslate">\; P</span>}<span\; class="notranslate">\; [</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; |</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; ]</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; log</span>}\frac{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="s"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">s</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; e</span>}}^{{\mathrm{<span\; class="notranslate">\; LLR</span>}}_{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; LLR</span>}}_{{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="s"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">s</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; LLR</span>}}_{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}}{\underset{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="s"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">s</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; :</span>{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}{\mathrm{<span\; class="notranslate">\; e</span>}}^{{\mathrm{<span\; class="notranslate">\; LLR</span>}}_{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; NC</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; LLR</span>}}_{{\mathrm{<span\; class="notranslate">\; the\; <figure-callout\; id="1"\; label="s"\; filenames="HPA0000133524660000321.png"\; state="\{\{state\}\}">s</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; LLR</span>}}_{{\mathrm{<span\; class="notranslate">\; the\; s</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}}}$

(5)

Among them, k=1,2,3,4. k=1,2 are the LLRs of P1, and k=3,4 are the LLRs of P2. For example, the first digit b ₁ takes the sum of the joint probabilities in the last 8 rows in Table 1 as the numerator, and takes the sum of the joint probabilities in the first 8 rows as the denominator. The LLR _b sequence of P1 was deduced according to formula (5) and Table 1.

In step 903, the derived LLR _b -sequence is input to a turbo decoder to perform channel decoding on P1. The information of P2 can be combined with the received single packet and jointly modulated packet in a similar manner. The soft combination scheme is shown in Figure 10.

It can be seen from Fig. 10 that in order to combine with the joint modulation information, only one additional pre-processing is required, namely the soft combining block shown in the shaded part of Fig. 10 . When using the max-log-MAP algorithm (approximation algorithm), the complexity of this preprocessing is very low.

Example 2: Multi-User Uplink Joint Modulation (MUJM) AF Relay

FIG. 11 shows a flowchart of a substep of step S403 in the case of Example 2 according to the first embodiment of the present invention.

As shown in Figure 11, compared with Example 1, the relay station in Example 2 does not decode the received symbols after receiving the packets from the user terminal, but calculates the Symbol LLR (step S1101). Then, in step S1103, the relay station estimates the received symbols by the ML (Maximum Likelihood) principle, which can be calculated by the above expression (2). Finally, the relay station performs joint modulation on the estimated received symbols to obtain a joint modulation group (step S1105).

For example, the relay station performs joint modulation with reference to the mapping relationship shown in Table 1, and specifically maps two QPSK symbols from two UEs into one 16QAM symbol.

Since the network coding packet forwarded to the eNB in this example is also based on joint modulation, in this example, the eNB adopts a soft combination scheme (as shown in FIG. 10 ) similar to Example 1 for decoding, and details are not repeated here.

Fig. 12 shows a structural block diagram of a forwarding device 1200 for forwarding packets from multi-user terminals in a relay station of a wireless communication network according to the first embodiment of the present invention. In FIG. 12, the forwarding device 1200 includes a first receiving device 1202, configured to receive multiple packets from multiple user terminals respectively; a network coding device 1204, configured to perform joint modulation-based network coding processing on the multiple packets , to obtain a network coding group based on joint modulation; and a first sending unit 1206, configured to send the network coding group based on joint modulation to the eNB.

Preferably, the network encoding device 1204 includes: a first demodulation and decoding device, configured to demodulate and decode the plurality of packets; a first channel encoding device, configured to perform decoding when the plurality of packets are correctly decoded In this case, channel coding is performed on the multiple groups; and a first joint modulation device is configured to perform joint modulation on the multiple groups.

Preferably, the network coding means 1204 includes: LLR calculating means, for calculating the symbol LLR of each of the plurality of groups; estimating means, for estimating the received symbols according to the maximum likelihood criterion; and the second joint modulation Means for jointly modulating the estimated received symbols.

Fig. 13 shows a schematic structural diagram of a decoding device 1300 for decoding a packet from a user terminal in an eNB of a wireless communication network according to a first embodiment of the present invention. In FIG. 13 , the decoding device 1300 includes: a third receiving device 1302, configured to receive a plurality of packets from a plurality of user terminals and a network coding packet based on joint modulation from a relay station, wherein the network coding packet based on joint modulation It is obtained after performing network coding processing based on joint modulation on the multiple packets respectively received by the relay station; Network coded packets are decoded with joint soft combining. Wherein, the first soft combination decoding means 1304 includes: a first soft combination means, configured to perform soft combination on the respective soft information of the plurality of packets and the soft information of the network coding group based on joint modulation; and a first A decoding device, configured to input the result obtained by soft combining to a channel decoder for decoding (not shown in the figure).

[Second embodiment]

Fig. 14 shows a flowchart of a method for forwarding packets from multiple user terminals in a relay station according to the second embodiment of the present invention.

As shown in FIG. 14, in step 1401, the relay station receives multiple packets from multiple user terminals respectively. In step 1403, the relay station performs simulated network coding processing on the multiple packets to obtain a simulated network coded packet. In step 1405, the relay station sends the simulated network coding packet to the eNB.

In the following, the simulated network coding process in step S1403 in FIG. 14 will be specifically described by taking AF relay and DF relay scenarios as examples.

Example 3: Multi-User Uplink Analog Network Coding (ANC) DF Relay

FIG. 15 shows a flowchart of a sub-step of step S1403 in the case of Example 3 according to the second embodiment of the present invention.

As shown in Fig. 15, in step S1501, the relay station demodulates and decodes the multiple packets. In step S1503, the relay station judges whether all the multiple packets are decoded correctly. In this embodiment, the relay station performs the above judgment through CRC check. In the case that the multiple packets are all decoded correctly, the relay station performs channel coding and modulation on the multiple packets (step S1505), and then performs weighted summation using predetermined coefficients (step S1507). The relay station only functions as a conventional AF (amplify and forward) relay if there is at least one packet that was not decoded correctly. This means that the relay station still amplifies and forwards the received packets one by one.

In the application scenario shown in FIG. 3 , after receiving the packets from UE1 and UE2, the relay station performs relay modulation and channel decoding on P1 from UE1 and P2 from UE2. If the two packets are decoded correctly, the data bits of the two packets are channel coded and modulated, and the modulation symbols of the two packets are then encoded using coefficients k ₁ and k ₂ (also called ANC coefficients). Weighted and summed to obtain y _NC =k ₁ ·s ₁ +k ₂ ·s ₂ , and forward it to the eNB.

If the relay maintains a fixed transmit power, the coefficients _k1 and _k2 should be normalized first. Second, _k1 and _k2 should have equal moduli to maintain fairness between the two UEs. Otherwise, UEs with larger coefficient moduli will have better performance. All these conditions above can be used as factors to define the coefficients _k1 and _k2 . Here, exemplarily defined

的基础上，给出了如表2所示的ANC映射表。In the exemplary coefficient

On the basis of , the ANC mapping table shown in Table 2 is given.

Table 2 ANC mapping table

It should be noted that Table 2 is just an example, and the ANC coefficients and mapping tables are not limited thereto.

FIG. 16 shows a constellation diagram corresponding to the mapping table shown in Table 2. The constellation of QPSK conforms to the constellation diagram in the current non-patent document 3GPP TS36.211.

In this example, the eNB adopts a soft combining scheme similar to Example 1 (as shown in FIG. 10 ) for decoding. That is, soft combining of information on ANC can be performed by corresponding Table 2 with Expression (5). I won't go into details here.

Example 4: Multi-User Uplink Analog Network Coding (ANC) AF Relay

FIG. 17 shows a flowchart of a sub-step of step S1403 in the case of Example 4 according to the second embodiment of the present invention.

As shown in Figure 17, in step S1701, the relay station does not demodulate and decode the received symbols, but directly uses predetermined coefficients to weight and sum the received symbols, for example, use coefficients k1 and k2 to Symbols y1 and y2 in are weighted and summed to obtain y=k1*y1+k2*y2.

In the application scenario shown in FIG. 3 , after receiving the packets from UE1 and UE2, the relay station uses weighting coefficients k ₁ and k ₂ (ie, ANC coefficients) to weight the received symbols of these two packets to obtain y _NC = k ₁ ·y ₁ +k ₂ ·y ₂ , and forward it to the eNB.

In this example, the determination of the weighting coefficients and the ANC mapping rules are the same as those in Example 3, and will not be repeated here.

In this example, the soft combining scheme at the eNB side is the same as Example 3, that is, the same as Example 1 of the aforementioned first embodiment, and the soft combining of ANC information may also be performed through Expression (5) corresponding to Table 2.

Fig. 18 shows a structural block diagram of a forwarding device 1800 for forwarding packets from multi-user terminals in a relay station of a wireless communication network according to a second embodiment of the present invention. In FIG. 18, the forwarding device 1800 includes: a second receiving device 1802, configured to receive multiple packets from multiple user terminals respectively; an analog network coding device 1804, configured to perform analog network coding processing on the multiple packets, Obtain a simulated network coding group; and second sending means 1806, configured to send the simulated network coding group to the eNB.

Preferably, the analog network coding device 1804 includes: a second demodulation and decoding device, used to demodulate and decode the multiple packets; a second channel coding and modulation device, used to In the case of correct decoding, channel coding and modulation are performed on the multiple packets; and a first weighted summing device is used to perform weighted summation on the multiple packets by using a predetermined coefficient.

Preferably, the analog network coding means 1804 includes: a second weighted summing means, configured to perform weighted summation on the multiple received packets by using a predetermined coefficient.

Fig. 19 shows a schematic structural diagram of a decoding apparatus 1900 for decoding a packet from a user terminal in an eNB of a wireless communication network according to a second embodiment of the present invention. As shown in FIG. 19, the decoding device 1900 includes: a fourth receiving device 1902, configured to receive a plurality of packets from a plurality of user terminals and a simulated network coded packet from a relay station, wherein the simulated network coded group is for the relay station The plurality of received packets are obtained after analog network-based coding processing; and second soft combination decoding means 1904, configured to perform joint soft combination decoding on the plurality of packets and the analog network-based coding packets. Wherein, the second soft combination decoding means 1904 includes: a second soft combination means for performing soft combination on the respective soft information of the plurality of packets and the soft information of the simulated network coding packet; and a second decoding means , for inputting the result obtained by soft combining to a channel decoder for decoding (not shown in the figure).

FIG. 20 is a simulation graph illustrating the performance of network coding soft combining for each of the four network coding relay schemes according to the present invention.

Here, four physical layer network coding schemes of the present invention are compared with traditional DF/AF relay, XOR network coded relay, and the case without relay through simulation in Rayleigh channel. Assume that the variance of Rayleigh fading is 1 and the noise power distribution is AWGN. Assume that UE1 and UE2 have the same channel state. The RS-eNB link has the same channel state as the UE-eNB link, and the UE-RS link is 5dB better than the UE-eNB link. The UMTS1/3 Turbo code with a length of 3456 bits is used for channel coding. The modulation method is QPSK. Furthermore, for the evaluation of the NC scheme, the performance improvement per forwarding is used as the metric.

It can be seen from Figure 20 that at 10 ^-2 PER, for DF relay, traditional DF relay can obtain 2.7dB performance improvement by forwarding two subframes of two UEs, that is, the unit forwarding reception performance improvement is 1.35 In dB/FW, the unit forwarding and receiving performance of the XOR relay is improved to 1.25dB/FW, while the MUJM DF relay/ANC DF relay proposed by the present invention has a unit forwarding and receiving performance improvement of 1.9dB/FW. That is to say, the MUJM DF relay/ANC DF relay scheme proposed by the present invention has a higher improvement in unit forwarding and receiving performance. In terms of AF relay, the ANC AF relay scheme proposed by the present invention is also superior to the traditional AF relay scheme in terms of unit forwarding and receiving performance improvement. Table 3 lists the simulation results of the unit forwarding receiving performance improvement in FIG. 20 .

Table 3. Per-unit forwarding receive performance improvement for different relays

From Table 3, we can see that the scheme in the last row has higher efficiency. According to this scale, in layer 2 (L2), MUJM/ANC DF should be adopted as the NC relay scheme. If a small PER performance drop is acceptable, an XOR scheme can be employed to save computational complexity on the relay. In Layer 1 (L1), ANC AF should be adopted as the NC relay scheme.

In addition, it can be seen from the description in the manual that by using all these types of network coding relay solutions, 50% of forwarding resources can be saved. In addition, the performance of MUJM/ANC DF relay is better than traditional AF relay. In the saved TTI, no relay is needed, thus 50% of the transmission power can be saved. The AF NC scheme has extremely low complexity.

In summary, adopting the relaying scheme and the corresponding decoding scheme of the present invention can effectively save spectrum resources while maintaining receiving performance, reduce power consumption in the relaying process, and improve forwarding efficiency.

Although the present invention has been illustrated in conjunction with the preferred embodiments thereof, those skilled in the art will understand that various modifications, substitutions and alterations can be made to the present invention without departing from the spirit and scope of the invention. Accordingly, the invention should not be limited by the above-described embodiments, but by the appended claims and their equivalents.

Claims (12)

1. A method for forwarding a packet from a user terminal in a relay station of a wireless communication network, comprising the following steps: receiving a plurality of packets respectively from a plurality of user terminals; Demodulate and decode the multiple packets, and if the multiple packets are all correctly decoded, perform channel coding and joint modulation on the multiple packets to obtain a network coding packet based on joint modulation ;as well as Send the network coding group based on joint modulation to the base station. 2. A method for forwarding a packet from a user terminal in a relay station of a wireless communication network, comprising the steps of: receiving a plurality of packets respectively from a plurality of user terminals; calculating the symbol log likelihood ratio of each of the multiple groups, estimating received symbols according to the maximum likelihood principle, and performing joint modulation on the estimated received symbols to obtain a network coding based on joint modulation grouping; and Send the network coding group based on joint modulation to the base station. 3. A method for forwarding a packet from a user terminal in a relay station of a wireless communication network, comprising the steps of: receiving a plurality of packets respectively from a plurality of user terminals; performing weighted summation on the plurality of packets by using predetermined coefficients to obtain a simulated network coding packet; and sending the simulated network coding packet to the base station. 4. The method according to claim 3, wherein, before said utilizing predetermined coefficients to carry out weighted summation to said plurality of groups, further comprising the following steps: demodulating and decoding the plurality of packets; and If the multiple packets are all decoded correctly, perform channel coding and modulation on the multiple packets. 5. A forwarding device for forwarding a packet from a user terminal in a relay station of a wireless communication network, comprising: The first receiving means is used to receive a plurality of groups respectively from a plurality of user terminals; a first demodulation and decoding device, configured to demodulate and decode the plurality of packets; A first channel coding device, configured to perform channel coding on the multiple packets when the multiple packets are all correctly decoded; A first joint modulation means, configured to perform joint modulation on the multiple packets to obtain a network coding packet based on joint modulation; and The first sending device is configured to send the network coding group based on joint modulation to the base station. 6. A forwarding device for forwarding a packet from a user terminal in a relay station of a wireless communication network, comprising: The first receiving means is used to receive a plurality of groups respectively from a plurality of user terminals; log-likelihood ratio calculation means for calculating the symbol log-likelihood ratio of each group in the plurality of groups; Estimating means for estimating received symbols according to the principle of maximum likelihood; The second joint modulation means is used to perform joint modulation on the estimated received symbols, so as to obtain a network coding group based on joint modulation; and The first sending device is configured to send the network coding group based on joint modulation to the base station. 7. A forwarding device for forwarding a packet from a user terminal in a relay station of a wireless communication network, comprising: The second receiving means is used to receive a plurality of groups respectively from a plurality of user terminals; The second weighted summing means is used to perform weighted summation on the plurality of packets using predetermined coefficients to obtain an analog network coding packet; and The second sending means is used for sending the analog network coding packet to the base station. 8. The forwarding device according to claim 7, further comprising: second demodulation and decoding means for demodulating and decoding the plurality of packets; and The second channel coding and modulating means is used to perform channel coding and modulation on the multiple packets when the multiple packets are all correctly decoded, so that the second weighted summing means can perform the weighted summation and. 9. A method for decoding a packet from a user terminal in a base station of a wireless communication network, comprising the steps of: Receiving multiple packets from multiple user terminals and a network coding packet based on joint modulation from a relay station, wherein the network coding packet based on joint modulation is based on joint modulation on the multiple packets respectively received by the relay station obtained after network coding processing; performing soft combining on the respective soft information of the plurality of packets and the soft information of the joint modulation based network coding packet; and The result obtained by soft combining is input to the channel decoder for decoding. 10. A method for decoding a packet from a user terminal in a base station of a wireless communication network, comprising the steps of: receiving a plurality of packets from a plurality of user terminals and a simulated network coding packet from a relay station, wherein the simulated network coding packet is obtained after performing simulation-based network coding processing on the multiple packets respectively received by the relay station; soft combining the respective soft information of the plurality of packets with the soft information of the simulated network coding packet; and The result obtained by soft combining is input to the channel decoder for decoding. 11. A decoding apparatus for decoding a packet from a user terminal in a base station of a wireless communication network, comprising: The third receiving means is configured to receive a plurality of packets from a plurality of user terminals and a network coding packet based on joint modulation from a relay station, wherein the network coding packet based on joint modulation is the network coding packet received by the relay station respectively Multiple packets are obtained after network coding processing based on joint modulation; A first soft combining device, configured to perform soft combining on the respective soft information of the plurality of packets and the soft information of the network coding packet based on joint modulation; and The first decoding device is configured to input the result obtained by the soft combination into the channel decoder for decoding. 12. A decoding apparatus for decoding a packet from a user terminal in a base station of a wireless communication network, comprising: The fourth receiving device is configured to receive multiple packets from multiple user terminals and simulated network coding packets from the relay station, wherein the simulated network coding packets are simulated based on the multiple packets respectively received by the relay station Obtained after network coding processing; The second soft combining means is used to soft combine the respective soft information of the plurality of packets with the soft information of the simulated network coding packet; and The second decoding device is used for inputting the result obtained by the soft combination into the channel decoder for decoding.

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