Reference signal design for massive MIMO communication

Patent metadata

Field	Value
Publication number	US-9258161-B2
Application number	US-201313839544-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Dec 6, 2012
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

The present disclosure is directed to a system and method for extending a reference signal pattern to define additional reference signals using a phase division multiplexing (PDM) technique. The reference signal pattern can be a predefined reference signal pattern in a wireless communication standard and can be extended to support massive MIMO communication.

First claim

What is claimed is:

1. A transmitter comprising:
a reference symbol generator configured, as part of a phase division multiplexing technique, to apply first phase shifts to reference symbols of a first reference signal to produce first phase shifted reference symbols and to apply second phase shifts to the reference symbols of the first reference signal to produce second phase shifted reference symbols;
a first reference symbol inserter configured to insert the first phase shifted reference symbols into a first stream of information symbols for transmission by a first antenna over a frequency and a plurality of symbol time periods; and
a second reference symbol inserter configured to insert the second phase shifted reference symbols into a second stream of information symbols for transmission by a second antenna over the frequency and the plurality of symbol time periods,
wherein the first antenna and the second antenna are grouped into a first cluster as part of the phase division multiplexing technique, and
wherein the first and second phase shifted reference symbols are time, frequency, and code division multiplexed with third and fourth phase shifted reference symbols respectively transmitted by third and fourth antennas of the transmitter grouped into a second cluster as part of the phase division multiplexing technique.

2. The transmitter of claim 1 , wherein the first antenna and the second antenna are selected, as part of the phase division multiplexing technique, based on a position of the first antenna and a position of the second antenna in an antenna array at the transmitter.

3. The transmitter of claim 1 , wherein the third and fourth phase shifted reference symbols are generated from reference symbols of a second reference signal.

4. The transmitter of claim 1 , wherein the first phase shifted reference symbols are transmitted from the first antenna in a first set of orthogonal frequency division multiplexing symbols, and the second phase shifted reference symbols are transmitted from the second antenna in a second set of orthogonal frequency division multiplexing symbols.

5. The transmitter of claim 1 , wherein the first phase shifts are determined based on

ⅇ

-
j

⁢

⁢
2
⁢

⁢
π
⁢

⁢
f
⁢

τ

0
⁢
i

N

,

and the second phase shifts are determined based on

ⅇ

-
j

⁢

⁢
2
⁢

⁢
π
⁢

⁢
f
⁢

τ

1
⁢
i

N

,

where f is the frequency over which the first and second phase shifted reference symbols are transmitted, N is a number of frequency domain carriers, i is a symbol time period index, and τ 0i and τ 1i are different cyclic shift values.

6. The transmitter of claim 1 , wherein the first stream of information symbols and the second stream of information symbols are encoded to perform a multi-antenna technique using the first antenna and the second antenna.

7. The transmitter of claim 6 , wherein the multi-antenna technique is diversity, interference suppression, or spatial multiplexing.

8. A transmitter comprising:
a reference symbol generator configured to, as part of a phase division multiplexing technique used to extend a predefined reference signal pattern in a communication standard, apply a first phase shift to a reference symbol of a first reference signal of the predefined reference signal pattern to produce a first phase shifted reference symbol and apply a second phase shift to the reference symbol of the first reference signal to produce a second phase shifted reference symbol;
a first reference symbol inserter configured to insert the first phase shifted reference symbol into a first stream of information symbols for transmission by a first antenna at a symbol time period and frequency; and
a second reference symbol inserter configured to insert the second phase shifted reference symbol into a second stream of information symbols for transmission by a second antenna at the symbol time period and frequency,
wherein the first antenna and the second antenna are grouped into a first cluster as part of the phase division multiplexing technique, and
wherein the first and second phase shifted reference symbols are time, frequency, and code division multiplexed with third and fourth phase shifted references symbols respectively transmitted by third and fourth antennas of the transmitter grouped into a second cluster as part of the phase division multiplexing technique.

9. The transmitter of claim 8 , wherein the first antenna and the second antenna are selected, as part of the phase division multiplexing technique, based on a position of the first antenna and a position of the second antenna in an antenna array at the transmitter.

10. The transmitter of claim 8 , wherein the third phase shifted reference symbol and fourth phase shifted reference symbol are both generated from a reference symbol of a second reference signal of the predefined reference signal pattern.

11. The transmitter of claim 8 , wherein the antennas of the first cluster are selected across a different diagonal, horizontal, or vertical line of antennas in a rectangular antenna array at the transmitter than the antennas of the second cluster.

12. The transmitter of claim 8 , wherein the antennas of the first and second clusters are selected according to a striped pattern from a linear antenna array at the transmitter.

13. The transmitter of claim 8 , wherein the first cluster has a different number of antennas than the second cluster.

14. The transmitter of claim 1 , wherein the antennas of the first cluster are selected across a different diagonal, horizontal, or vertical line of antennas in a rectangular antenna array at the transmitter than the antennas of the second cluster.

15. The transmitter of claim 1 , wherein the antennas of the first and second clusters are selected according to a striped pattern from a linear antenna array at

Assignees

• Broadcom Corp

Inventors

• Jalloul Louay
• Mobasher Amin
• Ariyavisitakul Sirikiat

Classifications

• H04L27/2613 Primary

  Structure of the reference signals · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04L5/0023

  Time-frequency-space · CPC title

• H04L5/12

  the signals being represented by different phase modulations of a single carrier · CPC title