Method and system for the linearization of a MIMO communication scheme having nonlinear power amplifiers

Patent metadata

Field	Value
Publication number	US-10164583-B2
Application number	US-201615558245-A
Country	US
Kind code	B2
Filing date	Mar 13, 2016
Priority date	Mar 19, 2015
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A linearized MIMO system which includes a MIMO receiver which comprises one or more receiving units, each receiving unit comprises one or more receiving antennas and an optional MIMO spatial decoder. The linearized MIMO system also includes a linearized MIMO transmitter, which comprises a plurality of non-linear power amplifiers at respective transmission branches, where each of the non-linear power amplifiers feeds a respective antenna with an amplified signal. The linearized MIMO system also includes a MIMO spatial pre-coder for receiving an artificial data signal from a global linearizer, and based on a channel state information of the medium (medium-channel), the linearized MIMO system creates a plurality of transmission branch-signals. Each of the branch signals feeds one of the non-linear power amplifiers, respectively. The global linearizer receives a data signal and creates the artificial data signal.

First claim

The invention claimed is:

1. A linearized MIMO system which comprises:
a. a MIMO receiver which comprises one or more receiving units, each receiving unit comprises:
one or more receiving antennas;
an optional MIMO spatial decoder;

and
b. a linearized MIMO transmitter, which comprises:
a plurality of non-linear power amplifiers at respective transmission branches, each of said non-linear power amplifiers feeding a respective antenna with an amplified signal;
a MIMO spatial pre-coder for receiving an artificial data signal from a global linearizer, and based on a channel state information of a medium, creating plurality of transmission branch-signals, each of said branch signals feeding one of said non-linear power amplifiers, respectively; and
said global linearizer receiving a data signal and creating said artificial data signal.

2. A linearized MIMO system according to claim 1 , wherein said global linearizer receives said data signal, and in turn creates said artificial data signal based on a model of said MIMO system, including: (i) said MIMO spatial pre-coder; (ii) each of said non-linear power amplifiers; (iii) a MIMO medium-channel; and (iv) the MIMO spatial decoder, when exists, at each of said receivers.

3. A MIMO system according to claim 2 , wherein said artificial signal is created with the aim of obtaining an output signal from said one or more receivers which is closest to said data signal at the linearized MIMO transmitter.

4. A linearized MIMO system according to claim 2 , wherein said global linearizer is designed to perform an iterative process, said global linearizer comprises:
a. a model of the entire MIMO system for iteratively receiving a temporary artificial data signal, creating a modeled received signal of said one or more receivers, and returning said modeled received signal into a first adder;
b. said first adder for receiving said data signal and said modeled received signal, for subtracting said modeled received signal from said data signal to form an error signal, and for forwarding said error signal to a second adder;
c. a second adder for receiving said error signal and a temporary artificial data signal from a previous iteration, adding said two signals to form a new temporary artificial data signal; and
d. a threshold comparison unit for comparing a level of said error signal to a predefined threshold, and upon finding that said error signal is below said threshold, terminating the iterative process, and outputting said temporary artificial data signal as said artificial data signal to said spatial pre-coder that in turn creates said plurality of transmission branch-signals.

5. A linearized MIMO system according to claim 4 , wherein said threshold comparison unit counts a number of iterations and terminates the iterative process upon reaching a predefined maximal number of iterations.

6. A linearized MIMO system according to claim 1 , which further comprises a spectral purifier at each of said transmission branches for limiting a bandwidth of the transmitted signal from each branch respectively, said spectral purifier being located between said spatial pre-coder and a non-linear power amplifier, respectively, and wherein said global linearizer further bases said artificial data signal on characteristics of said spectral purifier.

7. A linearized MIMO system according to claim 1 which comprises a single antenna at the receiver.

Assignees

• B G Negev Technologies And Applications Ltd At Ben Gurion Univ
• B G Negev Technologies And Applications Ltd At Ben Gurion Univ

Inventors

• Wulich Dov
• Iofedov Ilia

Classifications

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H03F1/3258

  based on polynomial terms · CPC title

• H03F3/68

  Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics {(power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602)} · CPC title

• H03F2200/451

  the amplifier being a radio frequency amplifier · CPC title

• H03F3/24

  of transmitter output stages · CPC title