Low-cost large-scale non-orthogonal multi-access method
A non-orthogonal multiple access, large-scale technology, applied in diversity/multi-antenna systems, shaping networks in transmitters/receivers, space transmit diversity, etc., can solve long training sequences, low spectrum efficiency, information transmission high energy consumption
Active Publication Date: 2019-06-28
ZHEJIANG UNIV
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[0005] In order to solve the problems of long training sequence, low spectrum efficiency, high computational complexity, high analog-to-digital conversion precision will increase cost, and high energy consumption for information transmission in the above solution, the present invention proposes a Low-cost large-scale non-orthogonal multiple access method
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[0040] The block diagram of low-cost large-scale non-orthogonal multiple access system is as follows: figure 1 As shown, the base station has N t One antenna is configured for each device, and these devices are divided into several clusters. The data transmission between the base station and the device is divided into three parts: channel estimation, uplink data transmission and downlink data transmission. First determine the duration of these three parts through the optimization plan, and then start transferring data. In the channel estimation phase, all devices transmit training sequences to the base station at the same time, and the base station obtains the equivalent channel state information of each cluster through channel estimation. In the uplink data transmission stage, the device transmits the signal through superposition coding, and the base station receives the signal through the receiving beam, and performs serial interference cancellation on the signal in the cl...
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The invention discloses a low-cost large-scale non-orthogonal access method. A multi-antenna base station is arranged in the center of a cell, and surrounding equipment is divided into a plurality ofclusters. Data transmission between the base station and the equipment is divided into three parts: channel estimation, uplink data transmission and downlink data transmission. The method comprises: firstly, the duration of the three parts is determined through an optimization scheme, and then data transmission is started; in the channel estimation stage, all devices transmit training sequences tothe base station at the same time, and the base station obtains equivalent channel state information of each cluster through channel estimation; and in the uplink data transmission stage, the equipment transmits the signal through superposition coding, and the base station end receives the signal through receiving the beam; in the downlink data transmission stage, the base station carries out superposition coding on transmitted signals of each cluster, and then the signals subjected to superposition coding are transmitted out after beam forming. The invention provides an effective wireless access method for constructing the low-cost large-scale access Internet of Things.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a low-cost large-scale non-orthogonal multiple access method. Background technique [0002] In recent years, the rise of the mobile Internet has led to the rapid development of the Internet of Things industry. The future wireless network needs to support the simultaneous access of large-scale devices. 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 allocated Give a device. Due to the scarcity of wireless resources, it is difficult for traditional orthogonal multiple access technology to support simultaneous access of large-scale devices. In this context, non-orthogonal multiple access technology has been extensively studied and widely considered as one of the key technologies for future broadb...
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IPC IPC(8): H04B7/06H04L25/02H04L25/03
Inventor 俞光华陈晓明
Owner ZHEJIANG UNIV