Uplink and downlink transmission method and device based on two-way relay protocol
A technology of two-way relay and transmission method, applied in the field of communication, can solve the problem of low spectrum efficiency, and achieve the effect of reducing fading and improving spectrum utilization.
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Embodiment 1
[0031] The architecture diagram of an uplink and downlink transmission method based on the two-way relay protocol in the embodiment of the present invention is as follows figure 1 As shown, which includes a base station, a relay node, and two terminals, the method provided by the embodiment of the present invention is as follows figure 2 shown, including:
[0032] 101. The relay node receives signals to be transmitted sent by the base station and two terminals;
[0033] In the embodiment of the present invention, the relay node is a two-way relay model, which is an effective two-way link transmission model, and the relay node can significantly improve the utilization rate of the wireless channel, because The relay node uses physical layer network coding to effectively superimpose the two signals received in the first time slot, and then broadcasts the superimposed signal to the two signal sources in the second time slot. At the same time, since each source node knows its ow...
Embodiment 2
[0058] The base station and two mobile phone terminals perform two-way information exchange, where the number of antennas at the base station is N and N=2, and the two mobile phone terminals are equipped with only one antenna, and the number of antennas at the relay node is M. Refer to the attached image 3 , the method includes:
[0059] 201. The base station and the two mobile phone terminals simultaneously send the signal to be transmitted to the relay node, and the signal received by the relay can be expressed as here x B is the signal sent by the base station, and it can be represented by x B =Bs B , B is the precoding matrix of the base station. the s k is the signal sent by user terminal k with power P k . h 1 is the channel matrix from the base station to the relay node, h 2k is the matrix from mobile terminal k to relay node, n R is the receiving noise of the relay node, its mean value is 0, and the covariance matrix is
[0060] 202. The relay node will r...
Embodiment 3
[0082] The embodiment of the present invention also provides an uplink and downlink transmission device based on a two-way relay protocol, including:
[0083] a receiving unit 301, configured to receive signals to be transmitted sent by the base station and the two terminals;
[0084] The broadcast unit 302 is configured to multiply the signal to be transmitted by a precoding matrix, and then broadcast it to the base station and the two terminals, so that the base station receives the broadcast signal and broadcasts the broadcast signal After performing self-interference cancellation, multiply by a linear minimum mean square error equalizer, and then perform demodulation; the two terminals receive the broadcast signal, and perform self-interference cancellation on the received broadcast signal, Then demodulate.
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