Semiblind detection method for physical uplink control channel of LTE (long-term evolution) system
A control channel and physical layer technology, applied in multi-frequency code systems, baseband system components, etc., can solve problems such as low code rate and poor channel accuracy
Active Publication Date: 2015-04-29
BEIJING UNIV OF POSTS & TELECOMM
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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
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[0111] The process of this embodiment is the same as the semi-blind detection algorithm in Method 2, but the processing procedures of each link are greatly optimized. The basic idea of this embodiment is: optimizing a large number of repetitive calculation processes to eliminate redundant calculation processes; deep derivation of expressions to obtain more concise expressions, thereby reducing the amount of calculations. The detailed derivation process and implementation steps are described below.
[0112] Picture 9 It is a flowchart of the steps of a PUCCH semi-blind detection method according to an embodiment of the present invention.
[0113] First, demultiplex the cell input information R(l,k) received by the base station to obtain terminal information R u (l,k) (step S901), where l is the symbol bit of SC-FDMA, k is the subcarrier sequence number, and u is the terminal sequence number. Specifically, step S901 includes two sub-steps S9011 and S9012 ( Picture 9 Not shown in...
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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 present invention relates to the field of wireless communication technology, and in particular to a semi-blind detection method of the physical layer uplink control channel of an LTE system. Background technique [0002] In the Long Term Evolution (LTE) system, the Physical Uplink Control Channel (PUCCH) can send a variety of Uplink Control Indicator (UCI) information, including the hybrid automatic retransmission request of the downlink data packet (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. PUCCH sends different uplink control information according to different uplink ...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 彭涛庞亦龙王文博
Owner BEIJING UNIV OF POSTS & TELECOMM