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Cancelling intermodulation interference

An intermodulation interference, modeling technology, applied in various modulation transmitter/receiver arrangements, digital transmission systems, electrical components, etc., to solve problems such as inapplicability of solutions

Active Publication Date: 2017-05-10
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third-order intermodulation is usually the main source of interference, while 5th-, 7th-, or any odd-order intermodulation products can cause problems in signal reception
Solutions based on US 2012 / 0295558 will not apply if interference is generated in the receiver filter or any other receiver signal path component

Method used

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  • Cancelling intermodulation interference
  • Cancelling intermodulation interference
  • Cancelling intermodulation interference

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Embodiment Construction

[0028] Figure 1a -c shows some more specific problems addressed by this disclosure. Figure 1a The block diagram schematically presented in is a simplified representation of radio transceiver 100 . Transceiver 100 includes antenna 101, duplex filter 110, low noise amplifier 120, power amplifier 130, RF signal chain 140, which includes ( Figure 1a not shown) variable gain amplifier, mixer, intermediate frequency (IF) and / or baseband filter, etc. The transceiver also includes a digital signal processing block 150, which may be implemented with a field programmable gate array (FPGA), a central processing unit (CPU), or any other suitable digital processing means.

[0029] As briefly discussed above, if the received signal is degraded by an interfering signal generated by receive signal path intermodulation signal products, and this interference degrades the received signal quality, steps need to be taken to restore the received signal quality . If the interfering signal is kno...

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Abstract

Cancelling of intermodulation interference is described. A digital signal sample (x) is received and a power of the received digital signal sample is obtained (243). Based on the obtained power, at least one model value is obtained from a model (244) that models model values of a non-linearity in amplitude and phase of a received signal that passes through passive and active components in the receiver. The model values correspond to a plurality of powers of the received signal. Intermodulation interference is then cancelled by multiplying (245) the received digital signal sample with the obtained at least one model value, thereby obtaining an output digital signal sample (y) from which intermodulation interference, inflicted by the receiver, is cancelled.

Description

technical field [0001] Embodiments herein relate to canceling intermodulation interference in a receiver in a wireless communication node. Background technique [0002] A problem associated with radio receivers in small wireless communication devices is that the radio frequency (RF) components need to be miniaturized. However, the miniaturization of RF components typically results in RF components having reduced performance in terms of noise and RF interference performance compared to non-miniaturized RF components, for example components used in products such as radio base stations. In addition, RF components need to be cost-effective and power-efficient, which creates additional performance challenges. Therefore, in order to be able to use such degraded RF components while still maintaining good radio performance in radio receivers, improved interference cancellation is needed. [0003] Non-linear RF components generate intermodulation interference signals from signals p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10
CPCH04B1/1027H04B1/1036H04B2001/1054H04B1/109H04B1/525H04L5/1461H04L27/0008
Inventor K·黑尼克斯基M·E·雷诺南
Owner TELEFON AB LM ERICSSON (PUBL)
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