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Method and diversity receiver for computing an estimate of differential phase

A differential phase, receiver technology, applied in the directions of space transmit diversity, diversity/multi-antenna systems, radio transmission systems, etc., and can solve problems such as distortion of received signals

Active Publication Date: 2017-02-01
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In systems where separate oscillators are used to downconvert radio frequency (RF) signals received by different antennas, phase noise from each oscillator distorts the received signal

Method used

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  • Method and diversity receiver for computing an estimate of differential phase
  • Method and diversity receiver for computing an estimate of differential phase
  • Method and diversity receiver for computing an estimate of differential phase

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Embodiment Construction

[0015] In the following description, for purposes of explanation and not limitation, specific details are set forth (eg, particular components, elements, techniques, etc.) in order to provide a thorough understanding of the example embodiments. However, example embodiments may be practiced otherwise than these specific details. In other instances, detailed descriptions of well-known methods and elements are omitted so as not to obscure the description of the example embodiments.

[0016] figure 1 An example of a general multiple-input multiple-output (MIMO) system is shown. figure 1 The system can include any number of transmitters, for example, TX1 11, TX2 13 and TX3 15. Transmitters 11, 13 and 15 may be configured to transmit wireless signals 12, 14 and 16 to receiver 20, respectively. Receiver 20 may include receiver ports 17, 19 and 21 which may be configured to receive wireless signals 12, 14 and 16, respectively. It should be appreciated that in addition to transmitt...

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PUM

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Abstract

Example embodiments comprise a diversity receiver, and corresponding method, for measuring a differential phase between a first local oscillator of a first antenna and a second local oscillator of a second antenna in the presence of a primary interference signal and at least one secondary interference signal. The method may comprise receiving a primary communication signal, a primary reference signal and additional reference signals, and processing these signals such that a summation signal does not substantially comprise the at least one secondary interference signal. The estimation of differential phase is achieved by a phase shift calculation between processed signal components, using that a summation of all signal components equals, or is approximately equal to, a predetermined signal.

Description

technical field [0001] Some of the exemplary embodiments presented herein relate to methods for interference suppression of wireless communication signals in a receiver. Background technique [0002] In multi-antenna systems (e.g., cross-polarization interference cancellation (XPIC) systems and multiple-input multiple-output (MIMO) systems), the receiver usually needs accurate knowledge of the aggregated propagation channel between the transmitter and receiver in order to be able to The transmitted data is decoded without excessive error. In systems where separate oscillators are used to downconvert radio frequency (RF) signals received by different antennas, phase noise from each oscillator distorts the received signal. In an attempt to reduce oscillator phase noise, current systems rely on local oscillators with low phase noise. Other systems rely on the use of a common downconverting oscillator or complex signal processing techniques for multiple receivers. Contents o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08
CPCH04B7/084
Inventor 丹·温霍尔特马特斯·里德斯特罗姆
Owner TELEFON AB LM ERICSSON (PUBL)