Methods of beam-indexed spatial modulation

Patent metadata

Field	Value
Publication number	US-10148325-B2
Application number	US-201715720507-A
Country	US
Kind code	B2
Filing date	Sep 29, 2017
Priority date	Apr 21, 2017
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

This invention provides methods of beam-indexed spatial modulation (BISM) for multiple-input and multiple-output (MIMO) technology. It does not only enhance the efficiency of MIMO using, but also address the compatibility problems in Spatial Modulation (SM-MIMO) and Orthogonal Frequency Division Multiplexing Index Modulation (OFDM-IM). Furthermore, the BISM improves the speed limitation problem and spectral efficiency issue in the current spatial modulation architectures.

First claim

What are claimed are as follows:

1. A first method of beam-indexed spatial modulation (BISM) for a multiple-input and multiple output (MIMO) module having a transmitter end and a receiver end, comprising:
step a) confirming that the MIMO module has a plurality of beams, the number of the plurality of beams is N B , each of the plurality of beams is an individual channel constituted by one of antennas at the transmitter end and one of antennas at the receiver end;
step b) providing an index to the N B beams through a N T ×N R channel matrix H, wherein N T are an integer number of a plurality of transmitting antennas and N R are an integer number of a plurality of receiving antennas, which H is decomposed by the singular value decomposition and represented by

H
=

U
⁢

⁢
Λ
⁢

⁢

V
H

=

∑

i
=
1

N
B

⁢

σ
i

⁢

u
i

⁢

v
i
H

wherein U is a unitary matrix, V is a unitary matrix, u i =1, . . . , N B , are orthonormal column vectors of U, and v i , i=1, . . . , N B , are orthonormal column vectors of V, Λ is an N B ×N B diagonal matrix with singular values σ i =σ 1 , σ 2 , . . . , σ N B of the MIMO module, and N B is an integer;
step c) evaluating a communication condition of the plurality of beams and selecting a plurality of sub-channels, which number is n B , out of the individual channels of the plurality of beams as transmit beams, and transmitting a signal and the index via the antennas of the transmit beams at the transmitter end; and
step d) receiving and recognizing the index at the receiver end, by the antennas, and further detecting the symbols of the transmit beams received at the receiver end.

2. The method of claim 1 , wherein the MIMO module is compatible with orthogonal frequency-division multiplexing (OFDM).

3. The method of claim 1 , wherein the index is represented by either a plurality of M-ary quadrature amplitude modulation symbols or a plurality of spatial bits.

4. The method of claim 3 , wherein the spatial bits are binary.

5. The method of claim 1 , wherein the number of the transmit beams equals to the number of the sub-channel, n B , plus one.

6. The method of claim 5 , wherein the index comprises a zero bit to represent those unselected sub-channels.

7. A second method of beam-indexed spatial modulation (BISM) for a multiple-input and multiple output (MIMO) module having a transmitter end and a receiver end, comprising:
step a) confirming that the MIMO module has a plurality of beams, the number of the plurality of beams is N B , each of the plurality of beams is an individual channel constituted by one of antennas at the transmitter end and one of antennas at the receiver end;
step b) providing an index to the N B beams through a channel matrix H which is decomposed by the angular steering vectors and represented by:

H
=

∑

i
=
1

N
B

⁢

a
i

⁢

e
r

⁡

(

Ω
ri

)

⁢

e
t
*

⁡

(

Ω
ti

)

wherein a i is an attenuation of the i-th beam, e t (Ω ti ) is a vector of angle of departure representing by

e
t

⁡

(

Ω
ti

)

=

1

N
T

[

1
,

exp
⁡

(

-
j

⁢

⁢
2
⁢

⁢
π
⁢

⁢

Δ
t

⁢

Ω
ti

)

,

exp
⁡

(

-
j

⁢

⁢
2
⁢

⁢

Assignees

• Univ Nat Taiwan
• Mediatek Inc

Inventors

• Wu Jen-Ming
• Chang Liang-Kai
• Wu Jian-Wei
• Hu Yu-Hsuan

Classifications

• H04B7/028

  Spatial transmit diversity using a single antenna at the transmitter · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04B7/0413 Primary

  MIMO systems · CPC title

• H04L27/3405

  Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power · CPC title

• H04B7/06952

  Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping · CPC title