Joint active user detection and channel estimation method of dispatching-free transmission system

A technology of active user and scheduled transmission, which is applied in the field of joint active user detection and channel estimation in a scheduling-free transmission system, and can solve high-complexity problems

Active Publication Date: 2018-09-14
SOUTHEAST UNIV
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Problems solved by technology

Each iteration of the FOCUSS algorithm requires multiplication of high-dimensional matrices, which is very complex and not suitable for massive MIMO random access scenarios.

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  • Joint active user detection and channel estimation method of dispatching-free transmission system
  • Joint active user detection and channel estimation method of dispatching-free transmission system
  • Joint active user detection and channel estimation method of dispatching-free transmission system

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Embodiment Construction

[0064] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0065] In this specific implementation manner, a scheduling-free transmission system is considered, and uplink transmission does not need to request time-frequency transmission resources through a physical layer control channel, but directly sends signals according to synchronization time slots in a pre-allocated conflict domain. It is assumed that the signals sent by the same user in adjacent frames are independent of each other, and whether different users send signals are independent of each other. Assuming that the number of antennas at the base station is M, and the number of online users is N, whether each user sends a signal follows an independent and identically distributed Bernoulli distribution. The base station does not know which users are sending data to it at the current moment, that is, it does not know the set of active users, nor ...

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Abstract

The invention discloses a joint active user detection and channel estimation method of a dispatching-free transmission system. No time-frequency transmission resource needs to be requested via a physical layer control channel during uplink transmission, but signals are directly sent according to a synchronous time slot in a pre-allocated conflict domain. Considering scenes in which an initial active probability of a user is known and unknown, the joint active user detection and channel estimation method adopts three modules, namely, a channel estimation module, an active user detection moduleand an initial active probability estimation module, and a base station side obtains an active user set and channel response vector estimated values of all users in the set according to a received signal Y and a pilot matrix S via the iterative calculation of the three modules. Compared with the traditional block sparse signal reconstruction algorithm, the joint active user detection and channel estimation method disclosed by the invention has the advantages of significantly reducing the complexity of the algorithm and improving the active user leak detection performance and the channel estimation performance.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a joint active user detection and channel estimation method of a scheduling-free transmission system. Background technique [0002] In order to meet the low-latency, high-reliability and massive user connection communication scenarios of the next generation mobile communication technology (5G), a random access technology based on a shared collision domain is proposed. This technology does not require any handshake process between the user and the base station, that is, requesting transmission resources from the base station, accepting the allocation and scheduling of the base station, but randomly sending data in any time slot in the pre-allocated time domain, frequency domain, code domain and other resources , so as to remove control signaling, reduce overhead, and reduce delay. This type of random access technology is also called scheduling-free uplink transmission technolo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02
CPCH04L25/0202H04L25/0242H04L25/025
Inventor 王闻今高西奇樊浩尤力卢安安
Owner SOUTHEAST UNIV
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