A wideband large-scale terminal detection and channel estimation method based on mmWave/THz
A channel estimation and millimeter wave technology, applied in channel estimation, baseband system, baseband system components, etc., can solve the problems of high computational complexity and long pilot sequence
Active Publication Date: 2020-10-27
ZHEJIANG UNIV
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[0005] The purpose of the present invention is to solve the problem of the high computational complexity of the terminal activation detection and channel estimation schemes and the relatively large number of required pilot sequences in the existing millimeter wave / terahertz large-scale access system when the base station is equipped with a large-scale antenna array. Long problem, a millimeter-wave / terahertz-based method for large-scale terminal detection and channel estimation in wideband
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[0035] In this embodiment, the base station of the millimeter wave / terahertz broadband large-scale access system is equipped with M antennas, each terminal is equipped with one antenna, and orthogonal frequency division multiplexing technology is adopted. In each time slot, there are only a small number of terminals It is randomly activated to communicate with the base station, and other terminals are temporarily in a sleep state. And the activated terminal can directly access the network without being authorized by the base station. That is, at the beginning of each time slot, activated terminals transmit pilot sequences to the base station simultaneously through multiple carriers, and the base station obtains which terminals are in the active phase and obtains their corresponding channel state information through broadband large-scale terminal detection and channel estimation algorithms. In the remaining part of each time slot, the active terminal performs data interaction w...
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The invention discloses a broadband large-scale terminal detection and channel estimation method based on millimeter waves / terahertz. In the broadband cellular Internet of Things based on millimeter waves / terahertz, a base station equipped with a large-scale antenna array serves a large number of single-antenna devices at the same time. In order to fully utilize broadband characteristics of millimeter waves / terahertz, an orthogonal frequency division multiplexing technology is adopted. And in any given time slot, only a small part of terminals are activated, and other terminals are in a dormant state. According to the invention, an unlicensed random access protocol is adopted, i.e., the terminal is activated to simultaneously send a section of known pilot frequency sequence of the base station to the base station through a plurality of subcarriers. A base station detects the state of a terminal and estimates corresponding channel information by using a multi-rank known sparse recoverymethod. And then the base station performs data interaction with the activation equipment by using the estimated channel information. The invention provides a terminal detection and channel estimationmethod for the millimeter wave / terahertz broadband cellular Internet of Things with large-scale terminal access.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a millimeter-wave / terahertz-based broadband large-scale terminal detection and channel estimation method. Background technique [0002] With the rise and development of the Internet of Things and artificial intelligence, future wireless networks need to support simultaneous access of large-scale wireless terminals. Machine type communication (MTC) is widely regarded as one of the key technologies for future broadband wireless communication systems such as 6G. A key feature of MTC is that the activation patterns of terminals in the network are usually sporadic. Because in each time slot, only a small number of terminals are in an active state to communicate with the base station. Other devices are temporarily dormant to save energy, and they are only activated when triggered by an external event. The activated terminals simultaneously transmit pilot sequences to the base s...
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IPC IPC(8): H04L25/02
CPCH04L25/0202H04L25/0226
Inventor 邵晓丹陈晓明郑灯
Owner ZHEJIANG UNIV