Method and Apparatus for Signal Reception
A preferred embodiment of the present invention relates generally to enhancing quality of a received signal in a receiver. The received signal can be enhanced by reducing phase noise. A described method starts with determining input information, wherein the input information comprises at least one of the following pieces of information: a modulation-and-coding scheme of the received signal, a multiple-antenna configuration (MIMO configuration), a signal quality estimate of the received signal, or a frequency separation between the received signal and a transmitted signal. The method continues with selecting a bandwidth value on the basis of the input information. The selecting should result in such a bandwidth value which has an advantageous effect to the quality of the received signal. This advantageous effect is achieved by performing the following: using the bandwidth value for generating a local oscillator signal, and shaping the received signal with the local oscillator signal.
1 . A method of enhancing quality of a received signal in a receiver, the method comprising:
determining input information that comprises at least one of the following pieces of information:
a modulation-and-coding scheme of the received signal;
a multiple-antenna configuration;
a signal quality estimate of the received signal; and
a frequency separation between the received signal and a transmitted signal;
selecting a bandwidth value on the basis of the input information;
using the bandwidth value for generating a local oscillator signal; and
shaping the received signal with the local oscillator signal.
2 . The method according to claim 1 , wherein the bandwidth value controls a bandwidth of a phase noise component in the local oscillator signal.
3 . The method according to claim 1 , wherein the using of the bandwidth value comprises a selection of an oscillator core.
4 . The method according to claim 1 , wherein the generating of the local oscillator signal comprises at least one of a frequency division operation and a use of a feedback loop.
5 . The method according to claim 1 , wherein the input information comprises at least two of the following pieces of information:
the modulation-and-coding scheme of the received signal;
the multiple-antenna configuration;
the signal quality estimate of the received signal;
the frequency separation between the received signal and a transmitted signal.
6 . The method according to claim 5 , wherein the selecting is performed taking into account the at least two pieces of information.
7 . The method according to claim 1 , wherein the signal quality estimate is a channel quality indicator.
8 . The method according to claim 1 , wherein the frequency separation is determined on the basis of at least one of a threshold value and a band used by the receiver, the band comprising an uplink frequency band and a downlink frequency band.
9 . An apparatus, comprising:
at least one processor and at least one memory including computer program code, the at least one processor and the computer program code configured to, with the at least one processor, cause the apparatus to perform, at a user equipment, at least the following:
determining input information that comprises at least one of the following pieces of information:
a modulation-and-coding scheme of the received signal;
a multiple-antenna configuration;
a signal quality estimate of the received signal; and
a frequency separation between the received signal and a transmitted signal;
selecting a bandwidth value on the basis of the input information;
using the bandwidth value for generating a local oscillator signal; and
shaping a received signal with the local oscillator signal to enhance quality of the received signal in a receiver.
10 . The apparatus according to claim 9 , wherein the bandwidth value controls a bandwidth of a phase noise component in the local oscillator signal.
11 . The apparatus according to claim 9 , wherein the using of the bandwidth value comprises a selection of an oscillator core.
12 . The apparatus according to claim 9 wherein the generating of the local oscillator signal comprises at least one of a frequency division operation and use of a feedback loop.
13 . The apparatus according to claim 9 , wherein the input information comprises at least two of the following pieces of information:
the modulation-and-coding scheme of the received signal;
the multiple-antenna configuration;
the signal quality estimate of the received signal;
the frequency separation between the received signal and a transmitted signal.
14 . The apparatus according to claim 13 , wherein the selecting is performed taking into account the at least two pieces of information.
15 . The apparatus according to claim 9 , wherein the signal quality estimate is a channel quality indicator.
16 . The apparatus according to claim 9 , wherein the frequency separation is determined on the basis of at least one of a threshold value and a band used by the receiver, the band comprising an uplink frequency band and a downlink frequency band.
17 . The apparatus according to claim 9 , wherein the selecting comprises use of a conditional clause.
18 . The apparatus according to claim 17 , wherein the conditional clause comprises at least one predefined threshold values.
19 . The apparatus according to any of claim 9 , wherein the apparatus comprises a signal shaper for shaping the received signal.
20 . The apparatus according to claim 19 , wherein the signal shaper comprises an oscillator and at least one the following devices: a mixer, divider, a phase detector, a loop filter, a phase locked loop.
21 . A non-transitory computer readable medium comprising a set of computer readable instructions stored thereon, which, when executed by a processing system, cause the processing system to enhance quality of a received signal in a receiver by performing at least:
determining input information that comprises at least one of the following pieces of information:
a modulation-and-coding scheme of the received signal;
a multiple-antenna configuration;
a signal quality estimate of the received signal; and
a frequency separation between the received signal a transmitted signal;
selecting a bandwidth value on the basis of the input information;
using the bandwidth value for generating a local oscillator signal; and
shaping the received signal with the local oscillator signal.