Superposition coding and demodulation method and device for multi-user information transmission
A technology of superposition coding and information transmission, which is applied in the field of superposition coding of demodulation and multi-user information transmission, and can solve problems such as lack of Gray mapping properties.
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Embodiment 1
[0110] Figure 6 It is a schematic diagram of a wireless broadcast communication system implemented by using a superposition coding method of a downlink multi-user information transmission system according to a preferred embodiment of the present invention. Such as Figure 6 As shown, the base station can transmit multi-user information to two user equipments (ie, UE1 and UE2).
[0111]In the base station, the dual information streams can be modulated into complex symbol sequences S1 and S2 with a certain power, and the complex symbol sequence S3 is obtained after image superposition processing.
[0112] First, the dual information streams are obtained by turbo encoding the dual information bit streams to be sent to the user respectively, wherein the protection priority of C1 is greater than that of C2. C1 and C2 are modulated into complex symbol sequences S1 and S2 with a certain power, wherein the modulation order of S1 is lower than or equal to the modulation order of S2....
Embodiment 2
[0118] Figure 7 It is a schematic diagram of a typical receiver structure of a downlink multi-user information transmission system according to a preferred embodiment of the present invention. Such as Figure 7 As shown, the receiver may include but not limited to: a receiving module, a demodulation module and a decoding module.
[0119] The dual information flow is transmitted on the "whole channel", the edge user receiver 1 demodulates the required information with other interference information, and the center user receiver 2 demodulates the interference information after demodulating the interference information and removes the interference information, mirror demodulation output the required information.
[0120] In receiver 1, the edge user first receives the complex symbol sequence R1, and then demodulates the strong signal (information sent to the edge user) S1' with the interference of the weak signal (information sent to the center user), and finally decodes the e...
Embodiment 3
[0123] Figure 8 A schematic structural diagram of a superposition coding device of a downlink multi-user information transmission system according to a preferred embodiment of the present invention. Figure 9 It is a structural schematic diagram of the transmitter module of the superposition coding device of the downlink multi-user information transmission system according to the preferred embodiment of the present invention. Such as Figure 8 and Figure 9 As shown, the superposition coding apparatus may include but not limited to: a transmitter BS, a channel, and a receiver. The transmitted signal reaches receiver 1 via channel 1 and receiver 2 via channel 2. The BS stores wireless channel related information with each receiver, and there is a large difference in the quality of the wireless channel from the BS to receiver 1 and from the BS to receiver 2, for example, a difference of 20 dB. The transmitter can be a base station, a relay node or a network coding node. Th...
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