Receiver in wireless communication system and diversity combining method thereof

Patent metadata

Field	Value
Publication number	US-9258151-B2
Application number	US-201314428421-A
Country	US
Kind code	B2
Filing date	Sep 17, 2013
Priority date	Sep 21, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

A diversity combining method applied by a receiver in a wireless communication system is provided, including: acquiring baseband signals of receiving channels corresponding to multiple receiving antennas, and combining multiple acquired baseband signals according to a Maximal-Ratio Combining (MRC) principle at an intermediate frequency and/or within an equalizer and/or after the equalizer. Further a receiver in a wireless communication system is provided. By means of the technical solutions of the disclosure, it is possible to improve a demodulation threshold and the demodulation sensitivity of a microwave system.

First claim

The invention claimed is:

1. A diversity combining method applied by a receiver in a wireless communication system, the method comprising:
acquiring baseband signals of receiving channels corresponding to multiple receiving antennas; and
combining, according to a Maximal-Ratio Combining (MRC) principle, the acquired baseband signals within an equalizer to obtain a diversity combined baseband signal with improved diversity gain by using a formula:

r
n

=

∑

i
=
1

L

⁢

S
⁢

⁢
N
⁢

⁢

R
i

⁢

r
n

(
i
)

;

wherein r n represents the diversity combined baseband signal, SNR i represents a Signal Noise Ratio (SNR) of a received signal corresponding to an ith receiving antenna, and r n (i) represents a baseband signal of a receiving channel corresponding to the ith receiving antenna.

2. The diversity combining method applied by a receiver in a wireless communication system according to claim 1 , wherein the acquired baseband signals of the receiving channels corresponding to the multiple receiving antennas are baseband signals processed by matched filtering.

3. A receiver in a wireless communication system, comprising:
an equalizer configured to acquire baseband signals of receiving channels corresponding to multiple receiving antennas, and combine, according to a Maximal-Ratio Combining (MRC) principle, the acquired baseband signals to obtain a diversity combined baseband signal with improved, diversity gain by, using a formula:

r
n

=

∑

i
=
1

L

⁢

S
⁢

⁢
N
⁢

⁢

R
i

⁢

r
n

(
i
)

;

wherein r n represents the diversity combined baseband signal, SNR i represents a Signal Noise Ratio (SNR) of a received signal corresponding to an ith receiving antenna, and r n (i) represents a baseband signal of a receiving channel corresponding to the ith receiving antenna.

4. The receiver in a wireless communication system according to claim 3 , further comprising:
a filter configured to perform matched filtering processing on the baseband signals of the receiving channels corresponding to the multiple receiving antennas, which are acquired from a Radio Frequency (RF) front end, and transmit processed signals to the first combination module.

5. A diversity combining method applied by a receiver in a wireless communication system, the method comprising:
performing intermediate frequency processing and matched filtering processing on a baseband signal of a receiving channel corresponding to an ith receiving antenna to obtain a time domain baseband signal r n (i) , wherein i=1, . . . , L;
performing Fast Fourier Transform (FFT) on r n (i) to obtain a frequency domain signal R k (i) ; and
performing combination within a frequency-domain equalization module according to a Maximal-Ratio Combining (MRC) principle using below formula to obtain an FFT value S k of a transmitted symbol:

S
k

=

∑

i
=
1

L

⁢

c
k

(
i
)

⁢

R
k

(
i
)

;

wherein c k (i) is a coefficient when FFT is performed on the transmitted symbol, where an optimal coefficient is obtained according to a minimum error principle and using a formula below:

c
k

(
i
)

=

(

σ
d

σ
n

(
i
)

)

2

⁢

(

H
k

(
i
)

)

*

1
+

∑

Assignees

• Zte Corp

Inventors

• Hou Xiaohui

Classifications

• H04L27/265

  Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators (H04L27/26524 takes precedence) · CPC title

• H04B7/0857

  using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS] · CPC title

• H04L25/03 Primary

  Shaping networks in transmitter or receiver, e.g. adaptive shaping networks · CPC title

• H04L27/0002

  analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line (duplex arrangements H04L5/143) · CPC title

• H04B7/08

  at the receiving station · CPC title