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Common reference signal design based on semi-uniform pilot spacing and orthogonal cover code

A common reference signal and coverage code technology, which is applied in pilot signal distribution, multi-frequency code system, wireless communication, etc., can solve the problems that the frequency tracking loop cannot be trained, and the interval is large in the time domain.

Active Publication Date: 2017-09-26
QUALCOMM INC
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  • Application Information

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Problems solved by technology

Although CSI-RS results in small overhead, the interval may be too large in the time domain to train the frequency tracking loop
CSI-RS may also lead to aliased channel energy response in long delay spread channels

Method used

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  • Common reference signal design based on semi-uniform pilot spacing and orthogonal cover code
  • Common reference signal design based on semi-uniform pilot spacing and orthogonal cover code
  • Common reference signal design based on semi-uniform pilot spacing and orthogonal cover code

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Embodiment Construction

[0026] The detailed description set forth below in connection with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. It will be apparent, however, to one skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring the concepts.

[0027] The techniques described herein may be used for various wireless communication networks, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, and others. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and so on. UTRA inc...

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Abstract

Systems and techniques are disclosed to reduce pilot overhead by providing common reference signals coded with cover codes that are orthogonal in time and frequency domains. Common reference signals that are coded by cover codes orthogonal in both domains can be de-spread in both the time and frequency domains for improved resolution and larger pull-in windows. Semi-uniform pilot spacing in both the frequency and time domains can be utilized. In time domain, a first pilot symbol pair is spaced by a first time interval and a second pilot symbol pair is spaced by a second time interval from the first pair, the second interval being greater than the first. In frequency domain, a first set of pilot symbols is densely placed in a selected frequency band and a second set of pilot symbols is sparsely placed surrounding and including the selected frequency band.

Description

[0001] Jing Jiang, Joseph Binamira Soriaga, Krishna Kiran Mukkavilli, Tingfang Ji, Huilin Xu, Naga Bhushan, Raghuraman Krishnamoorti, Peter Pui Lok Ang, John Edward Smee [0002] Cross References to Related Applications [0003] This application claims the benefit of U.S. Nonprovisional Patent Application No. 14 / 866,748, filed September 25, 2015, which claims the benefit of a patent application filed December 19, 2014, entitled "Common Reference Signal Design Based on Semi-Uniform Pilot Spacing and Orthogonal Cover Code," U.S. Provisional Patent Application No. 62 / 094,721, the disclosure of which is incorporated herein by reference in its entirety. technical field [0004] The present application relates to wireless communication systems, and in particular to semi-uniform pilot spacing and orthogonal spreading for reducing pilot signal overhead while still maintaining sufficient density for channel estimation and other purposes. Background technique [0005] Reference signa...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L27/26
CPCH04L5/0026H04L5/005H04L27/2613H04W72/0453H04L5/0016H04L25/0202H04L5/0007H04J13/0048H04L27/26134H04W72/0446H04W72/0466H04L5/0048H04L47/12
Inventor J·姜J·B·索里阿加K·K·穆克维利季庭方徐慧琳N·布尚R·克里希纳姆尔蒂P·P·L·洪J·E·斯米
Owner QUALCOMM INC
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