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Common phase error compensation

A phase error, associated technology, applied in the field of error compensation, to achieve the effect of improving resource utilization

Active Publication Date: 2018-12-21
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this creates a problem when the subcarriers used for common phase error tracking are blocked (crossed) by OFDM symbols used for DM-RS (which also contain common phase errors and require a phase error reference)

Method used

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Embodiment Construction

[0046] A conventional synchronous radio system includes an always-on downlink signal (eg, PSS / SSS / CRS in LTE) that enables the UE to track the time-frequency synchronization of the base station without communicating with the network. This design simplifies time-frequency synchronization, but at the cost of poor energy performance and constant interference from always-on signals.

[0047] A thin system design that eliminates signals that are always present is another option. However, the consequence of eliminating an ever-present signal such as CRS is that tracking and fine-tuning of time-frequency synchronization becomes more complicated. Relying on DM-RS for time-frequency synchronization will incur significant overhead as it uses most of the spectrum for synchronization at the expense of reduced data rates. For example, using DM-RS to track common phase errors is inefficient because the required time density is high for accurate common phase error tracking. DM-RS is design...

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Abstract

According to some embodiments, a method in a wireless receiver of compensating common phase error in a received wireless signal comprises receiving a first symbol of a wireless signal. The first symbol comprises a code division multiplexed demodulation reference signal (DM-RS) multiplexed with a length M orthogonal cover code, and a first code division multiplexed common phase error reference signal (CPE-RS) multiplexed with a length N orthogonal cover code, wherein N is less than or equal to M. The method further comprises determining M code points in the first symbol associated with a DM-RS;estimating a channel corresponding to the received wireless signal using the M code points associated with the DM-RS; estimating a first CPE-RS corresponding to the estimated channel using the firstN code points of the M code points associated with the DM-RS; and compensating the estimated channel for phase error using the estimated first CPE-RS.

Description

technical field [0001] Particular embodiments relate generally to error compensation in wireless communication networks, and more particularly to common phase error reference signals. Background technique [0002] Communications between wireless transmitters and receivers often require synchronization in time and / or frequency in order to receive messages reliably. In cellular systems such as 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) or LTE New Radio (LTENR, LTE-NX, or LTE 5G), base stations periodically broadcast narrowband synchronization signals (PSS / SSS ). Based on the synchronization signal, a wireless device accessing the system can perform an initial cell search (ie, a synchronization procedure including finding the carrier frequency, time reference instant, and cell identity). [0003] Then, the LTE device that has performed the initial cell search and recognized the cell identity can complete the initial synchronization in the downlink by ...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04L27/26H04J13/18
CPCH04J13/0048H04J2011/0016H04L5/0051H04L27/2675H04B1/12H04L5/026H04L25/0226
Inventor 马丁·赫斯勒拉尔斯·林德布姆约翰·福鲁斯克
Owner TELEFON AB LM ERICSSON (PUBL)
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