Hybrid orthogonal/non-orthogonal multiple access for radio signal transmission and reception

Patent metadata

Field	Value
Publication number	US-9553660-B2
Application number	US-201214111708-A
Country	US
Kind code	B2
Filing date	May 17, 2012
Priority date	May 20, 2011
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile station 200 A receives non-orthogonal signals, also receives a reference signal to be used for interference cancellation, and extracts the non-orthogonal signal addressed to the mobile station 200 A from the received non-orthogonal signals by demodulating and cancelling the radio signal addressed to another mobile station. In addition, the mobile station 200 A demodulates the extracted non-orthogonal signal addressed to the mobile station 200 A on the basis of the reference signal. The reference signal is multiplexed in the same radio resource block as a resource block allocated to the non-orthogonal signals, and is multiplexed in the radio resource block only when at least one signal is scheduled in the radio resource block.

First claim

The invention claimed is:

1. A receiver comprising:
radio signal reception circuitry configured to receive radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other;
interference cancelation circuitry configured to extract a non-orthogonal signal addressed to the receiver from the plurality of non-orthogonal signals received by a communication interface by demodulating and cancelling a radio signal addressed to another receiver; and
reference signal reception circuitry configured to receive a reference signal to be used by the interference cancellation circuitry to demodulate and cancel the radio signal addressed to the another receiver; and
demodulation circuitry configured to demodulate the non-orthogonal signal extracted by the interference cancellation circuitry and addressed to the receiver, on the basis of the reference signal, wherein
the reference signal is multiplexed in a same radio resource block as a radio resource block allocated to the non-orthogonal signals, and
the reference signal is multiplexed in the radio resource block in a case where at least one of the plurality of non-orthogonal signals is scheduled in the radio resource block.

2. A transmitter comprising:
radio signal transmission circuitry configured to transmit radio signals to a plurality of receivers located within a cell, the radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other; and
reference signal transmission circuitry configured to transmit a reference signal to be used by any of the receivers to demodulate and cancel a radio signal addressed to another one of the receivers from the plurality of received non-orthogonal signals, wherein
the reference signal transmission circuitry multiplexes the reference signal in a same resource block as a radio resource block allocated to the non-orthogonal signals, and
in a case where at least one of the non-orthogonal signals is scheduled in the radio resource block, the reference signal transmission circuitry multiplexes the reference signal to the radio resource block.

3. The transmitter according to claim 2 , wherein
the reference signal transmission circuitry transmits a reference signal common to a plurality of non-orthogonal signals multiplexed in the same radio resource block.

4. The transmitter according to claim 2 , wherein
the reference signal transmission circuitry transmits a plurality of reference signals respectively dedicated to a plurality of non-orthogonal signals multiplexed in the same radio resource block, and
the plurality of reference signals are orthogonally multiplexed with each other.

5. The transmitter according to claim 2 , wherein
the reference signal transmission circuitry transmits a plurality of reference signals respectively dedicated to a plurality of non-orthogonal signals multiplexed in the same radio resource block, and
the plurality of reference signals are code-multiplexed with each other.

6. The transmitter according to claim 2 , wherein
the reference signal transmission circuitry transmits a plurality of reference signals respectively dedicated to a plurality of non-orthogonal signals, and
the plurality of reference signals are configured such that a first signal addressed to a first receiver is orthogonal to a second signal addressed to a second receiver targeted for demodulation and cancellation of the first radio signal, but is not orthogonal to a third signal for another user not targeted for demodulation and cancellation of the first radio signal.

7. The transmitter according to claim 4 , further comprising:
control information transmission circuitry configured to transmit control information to a certain one of the plurality of receivers, the control information indicating a reference signal resource for the certain receiver and a reference signal resource for another one of the receivers.

8. The transmitter according to claim 5 , further comprising:
control information transmission circuitry configured to transmit control information to a certain one of the plurality of receivers, the control information indicating a first signal sequence for the certain receiver and a second signal sequence for another one of the receivers which is targeted for interference cancellation.

9. The transmitter according to claim 6 , further comprising:
control information transmission circuitry configured to transmit control information to a certain one of the plurality of receivers, the control information indicating a first reference signal resource for the certain receiver and a second reference signal resource for another one of the receivers which is targeted for interference cancellation.

10. A radio communication method comprising the steps of:
transmitting radio signals from a transmitter to a plurality of receivers located within a cell, the radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other;
transmitting, from the transmitter, a reference signal to be used by any of the receivers to demodulate and cancel the radio signal addressed to another one of the receivers from the plurality of received non-orthogonal signals;
receiving the non-orthogonal signals by each of the receivers;
receiving the reference signal by each of the receivers;
extracting, by any of the receivers, the non-orthogonal signal addressed to the receiver from the plurality of non-orthogonal signals by demodulating and cancelling the radio signal addressed to another one of the receivers by use of the received reference signal; and
demodulating, by the receiver, the non-orthogonal signal extracted in the extracting step and addressed to the receiver on the basis of the received reference signal.

Assignees

• Kishiyama Yoshihisa
• Ntt Docomo Inc

Inventors

• Kishiyama Yoshihisa

Classifications

• H04J11/0059

  Out-of-cell user aspects · CPC title

• H04B7/24 Primary

  for communication between two or more posts (wireless communication networks H04W) · CPC title

• H04L27/2647

  Arrangements specific to the receiver only (equalisation H04L27/01) · CPC title

• H04J11/004 Primary

  using regenerative subtractive interference cancellation · CPC title

• H04J11/0026 Primary

  of multi-user interference · CPC title