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Transmission scheme for wireless communication systems

A technology of wireless communication network and scheduling information, applied in the field of mobile communication network, can solve the problems affecting the performance of channel estimation at the receiver

Active Publication Date: 2018-12-04
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when the DMRS power is low, it will affect the channel estimation performance at the receiver

Method used

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  • Transmission scheme for wireless communication systems
  • Transmission scheme for wireless communication systems
  • Transmission scheme for wireless communication systems

Examples

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Embodiment Construction

[0024] In the following, examples of various embodiments of the present invention will be explained with reference to related drawings.

[0025] figure 1 According to a novel aspect, a mobile communication network 100 with MIMO precoding for the transmission mode of the two-layer UE-specific reference signal DMRS is represented. The mobile communication network 100 is an OFDM network including a serving base station eNB 101, a first user equipment 102 (UE#1), and a second user equipment 103 (UE#2). In the OFDMA downlink-based 3GPP LTE system, radio resources are divided into subframes in the time domain, and each subframe consists of two time slots. Each OFDMA symbol consists of a number of OFDMA subcarriers in the frequency domain depending on the system bandwidth. The basic unit of the resource grid is called a resource element (resource element, RE), which spans OFDMA sub-carriers with one OFDMA symbol. REs are classified as resource blocks (resource blocks, RBs), where...

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Abstract

A method of two-layer (Rank=2) demodulation reference signal (DMRS) based transmission scheme is proposed. The precoding matrix on a data RE can be represented as AxB. The precoding matrix on the UE-specific reference signal DMRS is A. Matrix B is the co-phasing cycling matrix. By applying the proposed co-phasing cycling matrix B for Rank=2 DMRS-based transmission scheme, the ratio of PDSCH EPRE to DMRS EPRE is equal to 0dB, as required by the LTE specification. Further, when the DMRS power follows the precoding matrix A, UE channel estimation performance is improved.

Description

[0001] cross reference [0002] This application claims priority under 35 U.S.C. §119 from U.S. Provisional Application No. 62 / 475,949, filed March 24, 2017, and entitled "Transmission Scheme for Wireless Communication Systems," and is hereby incorporated by reference In this article. technical field [0003] The invention relates to mobile communication networks. In particular, the present invention relates to a method of implementing an appropriate precoding matrix to improve the performance of channel estimation. Background technique [0004] Long Term Evolution (LTE) is an improved Universal Mobile Telecommunications System (UMTS) that provides higher data rates, lower latency, and improved system capacity. In the LTE system, an evolved universal terrestrial radio access network (evolved universal terrestrial radio access network) includes a plurality of base stations called evolved nodes (eNBs), which communicate with a plurality of mobile stations called user equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/00H04W72/00
CPCH04L5/0044H04L5/0051H04L5/0053H04B7/0473H04B7/0697H04B7/0486H04W72/23H04B7/0456H04W72/542H04L5/0048
Inventor 庄乔尧林松征陈义升
Owner MEDIATEK INC