Maintaining phase coherence for frequency offset estimation

A phase coherent, frequency offset technology, applied in the field of frequency offset estimation

Active Publication Date: 2016-07-13
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Additionally, these technologies must remain consistent and reliable even as LTE specifications evolve to support new modes of operation

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  • Maintaining phase coherence for frequency offset estimation
  • Maintaining phase coherence for frequency offset estimation
  • Maintaining phase coherence for frequency offset estimation

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Embodiment Construction

[0035] In the ensuing discussion, for purposes of explanation and not limitation, specific details of particular embodiments of the invention are set forth. Those skilled in the art will appreciate that other embodiments than these specific ones may be employed. Furthermore, in some instances, detailed descriptions of well-known methods, nodes, interfaces, circuits, and apparatus are omitted so as not to obscure the description with unnecessary detail. Those skilled in the art will appreciate that the described functionality may be implemented in one or more nodes. Some or all of the described functions will be implemented using hardware circuitry, such as analog and / or discrete logic gates, ASICs, PLAs, etc. interconnected to perform the specified functions. Likewise, some or all of the functions may be implemented using software programs and data in conjunction with one or more digital microprocessors or general purpose computers. Where nodes are described that communicate...

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Abstract

Techniques for facilitating and performing frequency-offset estimation are disclosed. The disclosed techniques include methods and apparatus for maintaining phase coherence among reference symbols on different transmission-time intervals (TTI) for an accurate estimation of frequency offset. Corresponding techniques utilize channel estimation or measurements of channel-related parameters based on multiple reference symbols belonging to different TTIs. An example method in a radio transceiver for facilitating frequency offset estimation at a remote receiver begins with determining that phase coherence between reference symbol transmissions in a first TTI and a second TTI is required. The radio transceiver selectively maintains phase coherence between reference symbol transmissions in the first and second TTIs, in response to said determining. The radio transceiver then transmits during at least part of a third TTI, following the second TTI, without maintaining phase coherence to the reference symbol transmissions in the first and second TTIs.

Description

technical field [0001] The present invention relates generally to wireless communication transceivers, and more particularly to techniques for facilitating estimation of frequency offsets in such transceivers. Background technique [0002] In long-term-evolution (LTE) wireless systems standardized by the 3rd Generation Partnership Project, a multiple-access technique called single-carrier-frequency-division multiple access (SC-FDMA) has been chosen for uplink (mobile terminal- to-base station) transmission. SC-FDMA combines the desirable features of Orthogonal Frequency Division Multiplexing (OFDM) with low peak-to-average power ratio (PAPR) on the downlink. This allows the design of more efficient power amplification in mobile terminals. [0003] In the SC-FDMA scheme, as in the OFDM scheme, the used bandwidth is divided into a number of orthogonal subcarriers. SC-FDMA can be considered as discrete-Fourier-transform coded OFDM, where time-domain data symbols are transfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L5/00
CPCH04L27/2657H04L27/2675H04W76/28H04L5/0051
Inventor S·索伦蒂诺杨宇G·约恩格伦D·哈马尔瓦尔
Owner TELEFON AB LM ERICSSON (PUBL)
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