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Semi-blind detection method for uplink control channel in physical layer of LTE system

A control channel and physical layer technology, applied in multi-frequency code systems, baseband system components, etc., can solve the problems of poor channel accuracy and low code rate, and achieve the reduction of calculation amount, elimination of calculation process, and reduction of calculation amount. Effect

Active Publication Date: 2018-10-02
BEIJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is to overcome the accuracy of channel estimation when the current LTE base station (Evolved Node B, eNodeB) performs semi-blind detection on PUCCH under the conditions of low reference signal occupancy rate, low code rate, and low-speed channel. poor degree of insufficiency

Method used

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  • Semi-blind detection method for uplink control channel in physical layer of LTE system
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  • Semi-blind detection method for uplink control channel in physical layer of LTE system

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Embodiment

[0110] The flow of this embodiment is the same as the semi-blind detection algorithm in the second method, but there are significant optimizations in the processing of each link. The basic idea of ​​this embodiment is: to optimize a large number of repetitive calculation processes and eliminate redundant calculation processes; to perform in-depth derivation on expressions to obtain more streamlined expressions, thereby reducing the amount of calculation. The detailed derivation process and implementation steps are described below.

[0111] Figure 9 It is a flow chart of the steps of the PUCCH semi-blind detection method according to the embodiment of the present invention.

[0112] First, the cell input information R(l,k) received by the base station is demultiplexed to obtain the terminal information R u (l, k) (step S901), wherein, l is a symbol bit of SC-FDMA, k is a subcarrier sequence number, and u is a terminal sequence number. Specifically, step S901 includes two su...

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Abstract

The invention discloses a semiblind detection method for a physical uplink control channel of an LTE (long-term evolution) system. The method comprises the following steps: performing demultiplexing on community input information R(l,k) received by a base station to obtain terminal information Ru(l,k), constructing channel frequency domain response matrixes Hu, symbol1(l,k), Hu, symbol2(l,k), Hu, symbol3(l,k) and Hu, symbol4(l,k) by QPSK (quadrature phase shift keying) symbols based on the terminal information Ru(l,k), selecting column vectors corresponding to the QPSK symbols from the channel frequency domain response matrixes according to assumed information for combination, and calculating channel frequency domain responses Hu, n, 1st(k) and Hu, n, 2nd(k) of the assumed information in each time slot to obtain channel estimation; calculating noise variances sigma 2u, n, lst and sigma 2u, n, 2nd of the assumed information in the time slot according to the community input information R(l,k) and the channel frequency domain responses Hu, n, 1st(k) and Hu, n, 2nd(k); traversing all assumed information, performing maximal-ratio combining on community input information R(l,k) received by antennas by the channel frequency domain responses Hu, n, 1st(k) and Hu, n, 2nd(k) and the noise variances sigma 2u, n, lst and sigma 2u, n, 2nd, calculating related values, and obtaining uplink control indication (UCI) information by assumed information corresponding to a maximum related value. According to the semiblind detection method, the detection performance can be remarkably improved; the calculated amount is greatly reduced in comparison with an existing semiblind detection method.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a semi-blind detection method for an LTE system physical layer uplink control channel. Background technique [0002] In the Long Term Evolution (LTE) system, the uplink control channel (Physical Uplink Control Channel, PUCCH) can send a variety of uplink control indicator (Uplink Control Indicator, UCI) information, including hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) confirmation information ACK and NACK, uplink transmission scheduling request (Scheduling Request, SR) and channel state information (Channel State Information, CSI). [0003] Each PUCCH transmission in a subframe is composed of a resource block (Resource Block, RB) at (or close to) the edge of the system bandwidth and a resource block at (or close to) the other edge of the system bandwidth. The PUCCH transmits different uplink control information according to different u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 彭涛庞亦龙王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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