Method and apparatus for DC offset degradation
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorMing Li
Life of this patent
Estimating the term…
Abstract
Embodiments of the present disclosure provide a method, apparatus and computer program products for DC offset degradation. A method implemented in a massive multi-input multi-output (MIMO) system, which comprises a plurality of receiver branches, includes receiving a radio frequency (RF) signal in the plurality of receive branches. The method further includes configuring different local frequencies of a plurality of local oscillators respectively in the plurality of receiver branches according to a carrier frequency of the RF signal, to enable direct current (DC) offsets in the plurality of receiver branches to be distinguishable from each other in frequency.
Claims18
A method implemented in a massive multi-input multi-output (“MIMO”) system, the massive MIMO system comprising a plurality of receiver branches, the method comprising:
- receiving a radio frequency (“RF”) signal in the plurality of receiver branches;
- and
- configuring different local frequencies of a plurality of local oscillators respectively in the plurality of receiver branches based on a carrier frequency of the RF signal to enable direct current (“DC”) offsets in the plurality of receiver branches to be distinguishable from each other in frequency,
- wherein the different local frequencies of the plurality of local oscillators are:
- configured such that the DC offsets are positioned respectively at a center of different subcarriers of a carrier carrying the RF signal;
- and
- configured to be different from the carrier frequency by (N+0.5) multiple of a subcarrier spacing, wherein N is a natural number.
An apparatus in a massive MIMO system, the massive MIMO system comprising a plurality of receiver branches, the apparatus comprising:
- a processor;
- and
- a memory having instructions stored therein that are executable by the processor to cause the apparatus to perform operations comprising:
- receiving a radio frequency (“RF”) signal in the plurality of receiver branches;
- and
- configuring different local frequencies of a plurality of local oscillators respectively in the plurality of receiver branches according to a carrier frequency of the RF signal to enable direct current (“DC”) offsets in the plurality of receiver branches to be distinguishable from each other in frequency,
- wherein configuring the different local frequencies of the plurality of local oscillators comprises:
- configuring the different local frequencies such that the DC offsets are positioned respectively at a center of different subcarriers of a carrier carrying the RF signal;
- and
- configuring the different local frequencies to be different from the carrier frequency by (N+0.5) multiple of a subcarrier spacing, wherein N is a natural number.
A massive multi-input multi-output (“MIMO”) system comprising:
- a plurality of receiver branches, each of which comprises an antenna configured to receive a radio frequency (“RF”) signal;
- and
- a processor;
- and
- a memory coupled to the processor and having instructions stored therein that are executable by the processor to cause the MIMO system to perform operations comprising:
- configuring different local frequencies of a plurality of local oscillators respectively in the plurality of receiver branches according to a carrier frequency of the RF signal to enable direct current (“DC”) offsets in the plurality of receiver branches to be distinguishable from each other in frequency,
- wherein configuring the different local frequencies of the plurality of local oscillators comprises:
- configuring the different local frequencies such that the DC offsets are positioned respectively at a center of different subcarriers of a carrier carrying the RF signal;
- and
- configuring the different local frequencies to be different from the carrier frequency by (N+0.5) multiple of a subcarrier spacing, wherein N is a natural number.
Dependencies are inferred from the claim text.