Method and device for transmitting and receiving signal by using multiple beams in wireless communication system

Patent metadata

Field	Value
Publication number	US-2016285164-A1
Application number	US-201415035201-A
Country	US
Kind code	A1
Filing date	Nov 6, 2014
Priority date	Nov 6, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

A method for receiving a signal by using M multiple beams in a multi-antenna system including N antenna elements, is provided in and embodiment of the present application. The method includes setting, by M beams, a beam direction for the M beams and a modulation frequency for frequency modulation of a beam response and generating the M beams according to the beam direction and the modulation frequency set by the beams. M beam responses are generated for a receiving signal by using the generated M beams and the generated M beam responses are frequency modulated by using the modulation frequency set by the beams. The frequency-modulated M beam responses are band-pass filtered so as to separate the M beam responses and the separated M beam responses are respectively demodulated.

First claim

What is claimed is:

1 . A method for receiving a signal by using an M number of multiple beams in a multi-antenna system including an N number of antenna elements, the method comprising:
setting beam directions of the M number of beams and modulation frequencies for frequency-modulating beam responses of the M number of beams, according to the M number of respective beams; generating the M number of beams according to the beam directions and the modulation frequencies which are set according to the M number of respective beams; generating an M number of beam responses to the received signal by using the M number of generated beams; frequency-modulating the M number of generated beam responses by using the modulation frequencies which are set according to the M number of respective beams; band-pass filtering the M number of frequency-modulated beam responses and separating the M number of beam responses from each other; and demodulating each of the M number of separated beam responses.

2 . The method as claimed in claim 1 , wherein the setting of the beam directions of the M number of beams and the modulation frequencies for frequency-modulating the beam responses of the M number of beams comprises:
determining pairs of beam directions and modulation frequencies which cause a sum of values obtained by multiplying the M number of respective beams, which are set for a k-th antenna element, by the modulation frequencies, which are set according to the M number of respective beams, to become one of complex gain values capable of being expressed by a Transmit/Receive Module (TRM) connected to the k-th antenna element; and selecting the beam directions and the modulation frequencies, which are set according to the M number of respective beams, from among the determined pairs of the beam directions and the modulation frequencies.

3 . The method as claimed in claim 2 , wherein the determining of the pairs of the beam directions and the modulation frequencies comprises:
converting a sum of values obtained by multiplying the M number of respective beams by the modulation frequencies, which are set according to the M number of respective beams, into a complex number having a magnitude and a phase; and determining the pairs of the beam directions and the modulation frequencies which cause the converted phase to become a multiple of a phase value capable of being expressed by a phase shifter within the TRM and cause the converted magnitude to become a multiple of a magnitude value capable of being expressed by an attenuator within the TRM.

4 . The method as claimed in claim 3 , wherein the phase value capable of being expressed by the phase shifter corresponds to 2π×(½)Np, wherein Np represents the number of bits of the phase shifter.

5 . The method as claimed in claim 3 , wherein the phase value capable of being expressed by the attenuator corresponds to 2π×(½)Na, wherein Na represents the number of bits of the phase shifter.

6 . The method as claimed in claim 2 , further comprising storing the determined pairs of the beam directions and the modulation frequencies in a table form.

7 . The method as claimed in claim 1 , wherein the sum of the values obtained by multiplying the M number of respective beams by the modulation frequencies, which are set according to the M number of respective beams, corresponds to a value changing according to time.

8 . An apparatus for receiving a signal by using an M number of multiple beams in a multi-antenna system including an N number of antenna elements, the apparatus comprising:
a beam control unit configured to set beam directions of the M number of beams and modulation frequencies for frequency-modulating beam responses of the M number of beams, according to the M number of respective beams; a beamformer configured to generate the M number of beams according to the beam directions and the modulation frequencies which are set according to the M number of respective beams; a reception unit configured to generate an M number of beam responses to the received signal by using the M number of generated beams; a digital signal processing unit configured to:
frequency modulate the M number of generated beam responses by using the modulation frequencies which are set according to the M number of respective beams; and
band-pass filter the M number of frequency-modulated beam responses and separates the M number of beam responses from each other; and
a demodulation unit configured to demodulate each of the M number of separated beam responses.

9 . The apparatus as claimed in claim 8 , wherein the beam control unit is configured to:
determine pairs of beam directions and modulation frequencies which cause a sum of values obtained by multiplying the M number of respective beams, which are set for a k-th antenna element, by the modulation frequencies, which are set according to the M number of respective beams, to become one of complex gain values capable of being expressed by a Transmit/Receive Module (TRM) connected to the k-th antenna element; and select the beam directions and the modulation frequencies, which are set according to the M number of respective beams, from among the determined pairs of the beam directions and the modulation frequencies.

10 . The apparatus as claimed in claim 9 , wherein the beam control unit is configured to:
convert a sum of values obtained by multiplying the M number of respective beams by the modulation frequencies, which are set according to the M number of respective beams, into a complex number having a magnitude and a phase; and determine the pairs of the beam directions and the modulation frequencies which cause the converted phase to become a multiple of a phase value capable of being expressed by a phase shifter within the TRM and cause the converted magnitude to become a multiple of a magnitude value capable of being expressed by an attenuator within the TRM.

11 . The apparatus as claimed in claim 10 , wherein the phase value capable of being expressed by the phase shifter corresponds to 2π×(½)Np, wherein Np represents the number of bits of the phase shifter.

12 . The apparatus as claimed in claim 10 , wherein the phase value capable of being expressed by the attenuator corresponds to 2π×(½)Na, wherein Na represents the number of bits of the phase shifter.

13 . The apparatus as claimed in claim 10 , further comprising a storage unit that stores the determined pairs of the beam directions and the modulation frequencies in a table form.

14 . The apparatus as claimed in claim 8 , wherein the sum of the values obtained by multiplying the M number of respective beams by the modulation frequencies, which are set according to the M number of respective beams, corresponds to a value changing according to time.

Assignees

• Samsung Electronics Co Ltd
• Korea Advanced Inst Sci & Tech

Inventors

• Choi Sang-Hyouk
• Kim Yong-Hoon
• Yang Hee-Seong
• Chun Joo-Hwan

Classifications

• H01Q3/26

  varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture ({H01Q3/12,} H01Q3/22, H01Q3/24 take precedence) · CPC title

• H01Q3/38 Primary

  the phase-shifters being digital · CPC title

• G01S19/36

  relating to the receiver frond end · CPC title

• H01Q3/36

  with variable phase-shifters · CPC title

• H04B7/0408

  using two or more beams, i.e. beam diversity · CPC title