Large-scale non-orthogonal multi-access method based on multi-relay assistance
A non-orthogonal multi-access, large-scale technology, applied in radio transmission systems, transmission monitoring, electrical components, etc., can solve the problems of low spectrum efficiency, high computational complexity, long training sequences, etc., to improve spectrum efficiency, The effect of reducing mutual interference and improving performance
Active Publication Date: 2017-12-15
ZHEJIANG UNIV
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Problems solved by technology
[0004] The purpose of the present invention is to solve the problems of long training sequence, low spectrum efficiency and high computational complexity when large-scale users access in the existing access scheme, and proposes a large-scale non-regular network based on multi-relay assistance. Multi-access method, and an effective method for the allocation of base station transmission power and relay forwarding power
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[0040] The block diagram of the non-orthogonal multiple access method based on multi-relay assistance is as follows figure 1 As shown, the base station has N tOne antenna is configured for each mobile terminal. A certain number of relays are distributed in the cell, and mobile users are connected to the nearest relay, and each relay serves a small number of terminals to reduce the complexity of serial interference cancellation. The base station uses the training sequence to obtain the channel state information of the relay, and based on the channel state information and large-scale fading information, it allocates power for each user's signal, and designs a transmit beam for the signal sent to each relay. After the relay receives the signal, it forwards the signal. After the mobile terminal receives the signal, it performs serial interference cancellation on the user signal in the same relay, so as to further reduce the interference and improve the performance of the system....
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The invention discloses a large-scale non-orthogonal multi-access method based on multi-relay assistance. The method comprises the following steps: a base station deploys a certain number of relays in a cell, and each mobile user selects a nearest relay to access networks; the base station obtains channel state information from the base station to all relays through channel estimation; the base station performs superposition coding for signals of users of each relay according to the obtained channel state information, and then transmits the signals that are subjected to superposition coding after performing zero forcing beamforming for the signals to avoid mutual interference between the relays; the relays forward the signals with appropriate power after receiving the signals; and after receiving the signals, the users firstly decode the signals of the users with weaker channel gains in the same relay, and then subtract the signals of these users from the received signals, and finally decode the own signals to reduce the interference among the users in the same relay. The invention provides an efficient non-orthogonal multi-access method for a broadband mobile communication system with large-scale user access.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a large-scale non-orthogonal multiple access method based on multi-relay assistance. Background technique [0002] With the rise and development of the Internet of Things and mobile Internet, future wireless networks need to support the simultaneous access of large-scale mobile users. In currently widely used orthogonal multiple access technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA) and code division multiple access (CDMA), a radio resource block Can only be assigned to one mobile terminal. Due to the scarcity of wireless resources, it is difficult for traditional orthogonal multiple access technology to support simultaneous access of a large number of users. In this context, non-orthogonal multiple access technology has been extensively studied and widely considered as one of the key technologies for future broadband w...
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IPC IPC(8): H04B7/155H04B17/309H04B17/336H04B17/382H04B17/391H04W52/24
CPCH04B7/15564H04B17/309H04B17/336H04B17/382H04B17/3911H04W52/241H04W52/243
Inventor 陈晓明贾润东
Owner ZHEJIANG UNIV