Single radio frequency double-stream transmission apparatus, use method and antenna system

Patent metadata

Field	Value
Publication number	US-9640874-B2
Application number	US-201514744755-A
Country	US
Kind code	B2
Filing date	Jun 19, 2015
Priority date	Dec 20, 2012
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Embodiments of the present disclosure provide a single radio frequency double-stream transmission apparatus, wherein the apparatus includes: a radio frequency link, a reactance control circuit, a parasitic reactor, an active antenna and an even number M of parasitic antennas, wherein M is larger than 2; the radio frequency link is configured to generate a radio frequency signal; the active antenna is connected with the radio frequency link, the parasitic antennas are respectively connected with the parasitic reactor, the distances from the parasitic antennas to the active antenna are the same, and the radian between adjacent parasitic antennas is
360 M ⁢ ⁢ degrees ;
the parasitic reactor may be adjusted by the reactance control circuit to make the reactance values of any pair of parasitic antennas in mirror symmetry via the active antenna be different and the reactance values of the rest pairs of parasitic antennas in mirror symmetry via the active antenna be equal respectively.

First claim

What is claimed is:

1. A single radio frequency double-stream transmission apparatus, comprising:
a radio frequency link, a reactance control circuit, a parasitic reactor, an active antenna and an even number M of parasitic antennas, wherein M is larger than 2;
the radio frequency link is configured to generate a radio frequency signal; wherein:
the active antenna is connected with the radio frequency link, the parasitic antennas are respectively connected with the parasitic reactor, distances from respective parasitic antennas to the active antenna are the same, and angular spacing between adjacent parasitic antennas is

360
M

⁢

⁢
degrees

;

and
the reactance control circuit is configured to adjust the parasitic reactor to make reactance values of any one pair of parasitic antennas in mirror symmetry around the active antenna be different and reactance values of remaining pairs other than the respective any one pair of parasitic antennas in mirror symmetry around the active antenna be equal.

2. The apparatus of claim 1 , wherein
a data stream s 1 is loaded onto the active antenna through the radio frequency link for transmitting; and
the reactance control circuit adjusts the reactance values of the respective parasitic antennas according to input of two paths of data streams s 2 and s 1 , for making the reactance values of the i th pair of parasitic antennas in mirror symmetry around the active antenna be different and the reactance values of the remaining parasitic antennas be equal respectively, in order to make

R
i

=

r
i

⁢

s
2

s
1

;

 wherein R i represents an adjustment coefficient, a parameter r i is used for ensuring equal power of two paths of basis functions B 0 (θ) and B i (θ), namely P(B 0 (θ))=r i 2 P(B i (θ)); wherein P(B 0 (θ)) represents power of a basis function B 0 (θ); P(B i (θ)) represents power of a basis function B i (θ); and B 0 (θ) and B i (θ) respectively represent two paths of orthogonal waveform basis functions unfolded for far fields of the antennas.

3. The apparatus of claim 2 , wherein
the reactance control circuit is further configured to perform following polling operation on all pairs of parasitic antennas in mirror symmetry around the active antenna: setting jX i =L1, jX′ i =L2, wherein jX i and jX′ i respectively represent reactance of an i th pair of parasitic antennas in mirror symmetry around the active antenna, and L1 and L2 represent reactance values which are set unequally; the reactance values corresponding to the remaining parasitic antennas in mirror symmetry are respectively equal, so that

R
i

=

r
i

⁢

s
2

s
1

=

r
i

,

 for sending pilot information p i (n) of an i th directivity diagram to a receiving end; and then, setting jX i =L2, jX′ i =L1, and the reactance values corresponding to the remaining parasitic antennas in mirror symmetry are respectively equal, so that

R
i

=

r
i

⁢

s
2

s
1

=

-

r
i

,

 for sending pilot information p′ i (n) of the i th mirror directivity diagram to the receiving end.

4. The apparatus of claim 3 , further comprising:
a receiving apparatus, configured to receive a directivity diagram index i* of maximum channel capacity fed back by the receiving end, wherein the directivity diagram index i* is obtained in the following manner: estimating channel information of respective directivity diagrams i and mirror images thereof according to the p i (n) and p′ i (n) received by the receiving end, and calculating channel information of two basis functions corresponding to the respective directivity diagrams i and the mirror images thereof to obtain channel capacity of the respective directivity diagrams i, so as to obtain the directivity diagram index i* of the optimal channel capacity; wherein the p i (n) represents the pilot information of the i th directivity diagram i, and the p′ i (n) represents the pilot information of the i th mirror directivity diagram.

5. The apparatus of claim 4 , wherein
the reactance control circuit is further configured to adjust jX i* , jX′ i* and jX i =jX′ i ∀i≠i* according to the directivity diagram index i* of the maximum channel capacity from the receiving end and the two paths of input data s 1 and s 2 , to make

R

i
*

=

r

i
*

⁢

s
2

s
1

.

6. An antenna system of a single radio frequency double-stream transmission, comprising: a receiving end and a transmitting end, wherein the transmitting end is the single radio frequency double-stream transmission apparatus of claim 1 ; and
the receiving end at least comprises two active antennas, and the active antennas are connected with the radio frequency link.

Assignees

• Huawei Tech Co Ltd

Inventors

• Lu Weishan
• Wu Tao

Classifications

• H01Q21/20

  the units being spaced along or adjacent to a curvilinear path {(slotted waveguide arrays H01Q21/005; circularly or helically slotted waveguides H01Q21/0062)} · CPC title

• H01Q3/446

  the radiating element being at the centre of one or more rings of auxiliary elements · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H01Q5/385

  Two or more parasitic elements · CPC title

• H01Q19/32

  the primary active element being end-fed and elongated · CPC title