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Interference cancellation

A technology of interference elimination and interference signal, which is applied to the shaping network, electrical components, transmission system and other directions in the transmitter/receiver, which can solve problems such as interference and achieve the effect of interference elimination

Inactive Publication Date: 2014-06-11
BROADCOM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Increased network density, one of the characteristics of LTE Release 12 and subsequent network deployment scenarios, leads to increased interference scenarios

Method used

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Embodiment Construction

[0035] Advanced receivers provide a way to suppress / mitigate interference at the receiver end. An improvement to the LMMSE-IRC receiver is based on real-valued modulation, which leads to increased degrees of freedom in terms of interference cancellation by exploiting the I / Q domain. The current LTE specification supports multiple constellations (M-QAM). Therefore, a UE equipped with 2 Rx antennas can effectively mitigate inter-cell interference from a rank-1 complex-valued interferer signal, provided that the desired transmission is also rank-1 complex-valued. Real-valued modulated transmission implementations increase degrees of freedom in the receiver, since the intended transmission occupies one dimension out of four available (2 I / Q branches x 2 Rx antennas). Such techniques may be even more attractive in MTC devices, where it is envisioned that only one Rx chain will be used in order to reduce UE cost. With one Rx antenna, real-valued modulation can achieve rank-1 desir...

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Abstract

A network node includes, into a field of downlink control information that provides a user equipment with information for reception and decoding of data transmitted from the network node to the user equipment in a mobile communication network, an indication of receiver information. The receiver information is applicable for interference suppression / cancellation by a receiving operation of the user equipment, capable of performing interference suppression / cancellation using the receiver information. The user equipment detects (S11) the receiver information from the downlink control information, and can select (S12) a receiving operation using the receiver information.

Description

technical field [0001] The present invention relates to interference cancellation or suppression. Background technique [0002] For the abbreviations used in this specification, the following meanings apply: [0003] [0004] [0005] Increased network density, one of the characteristics of LTE Release 12 and subsequent network deployment scenarios, leads to increased interference situations. On the transmitter side, CoMP transmissions are envisioned to improve cell edge performance by converting interference into useful signals. Interference can also be handled at the receiver, for example Release 11 specifies minimum performance requirements for receivers based on Linear Minimum Mean Square Error (LMMSE) Interference Rejection Combining (IRC). [0006] Another type of advanced receiver that implements interference cancellation is based on interference cancellation (IC), where the receiver detects (and eventually decodes) interfering signals and uses the detected sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04L25/02H04L25/03
CPCH04B1/10
Inventor T·T·科伊维斯托M·H·埃内斯库T·E·罗曼K·M·J·兰皮南
Owner BROADCOM CORP