# US 9,438,282 B2 · Receiver, transmitter and radio communication method

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- Number: US 9,438,282 B2
- Document ID: US9438282B2
- Status: Granted
- Kind: B2
- Application number: 14/118,790
- Filed: 2012-05-17
- Published: 2014-03-27
- Granted: 2016-09-06
- Earliest claimed: 2011-05-20
- Assignees: Ntt Docomo, Inc.
- Applicants: Yoshihisa Kishiyama; Benjebbour Anass
- Inventors: Yoshihisa Kishiyama; Benjebbour Anass
- Web page: https://patentgrep.com/patent/US9438282B2

## CPC

- H04B 1/10: Means associated with receiver for limiting or suppressing noise or interference
- H04J 11/0036: {at the receiver}
- H04J 13/004: {Orthogonal}
- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04W 72/12: Wireless traffic scheduling
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A mobile station includes: a physical channel segmentation unit to receive radio signals including multiple orthogonal signals which are orthogonal to each other, and multiple non-orthogonal signals which are not orthogonal to each other; and data demodulating/decoding units to extract the non-orthogonal signal addressed to the mobile station from the multiple non-orthogonal signals by demodulating and cancelling the radio signal addressed to another mobile station by use of the orthogonal signals included in the radio signals received by the physical channel segmentation unit, and demodulate the signal included in the orthogonal signals and addressed to the mobile station, and the extracted non-orthogonal signal addressed to the mobile station.

## Claims

### Claim 1

A receiver comprising:
a radio signal reception unit configured to receive radio signals including a plurality of orthogonal signals which are orthogonal to each other, and a plurality of non-orthogonal signals which are not orthogonal to each other;
an interference cancelation unit configured to extract 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 receiver by use of the orthogonal signals included in the radio signals received by the radio signal reception unit; and
a demodulation unit configured to demodulate the signal included in the orthogonal signals and addressed to the receiver, and the non-orthogonal signal extracted by the interference cancelation unit and addressed to the receiver.

### Claim 2

A receiver comprising:
a radio signal reception unit configured to receive radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other and are transmitted by using part or all of orthogonal resources being a plurality of radio resources orthogonal to each other;
an interference cancelation unit configured to extract the orthogonal resource including the non-orthogonal signal addressed to the receiver from the radio signals received by the radio signal reception unit, and extract the non-orthogonal signal addressed to the receiver from a plurality of non-orthogonal signals included in the extracted orthogonal resource, by demodulating and canceling the radio signal addressed to another receiver; and
a demodulation unit configured to demodulate the non-orthogonal signal extracted by the interference cancelation unit and addressed to the receiver.

### Claim 3 (depends on 1)

The receiver according to claim 1, wherein
the maximum number of signals multiplexed as the non-orthogonal signals is known to the receiver, and
the interference cancelation unit demodulates and cancels the radio signals addressed to other receivers within a range not exceeding the known maximum number of non-orthogonal signals.

### Claim 4 (depends on 2)

The receiver according to claim 2, wherein
the maximum number of signals multiplexed as the non-orthogonal signals is known to the receiver, and
the interference cancelation unit demodulates and cancels the radio signals addressed to other receivers within a range not exceeding the known maximum number of non-orthogonal signals.

### Claim 5

A radio communication method comprising the steps of:
receiving radio signals by a communication device, the radio signals including a plurality of orthogonal signals which are orthogonal to each other, and a plurality of non-orthogonal signals which are not orthogonal to each other;
extracting, by the communication device, the non-orthogonal signal addressed to the communication device from the plurality of non-orthogonal signals by demodulating and cancelling the radio signal addressed to another receiver by use of the orthogonal signals included in the received radio signals; and
demodulating, by the communication device, the signal included in the orthogonal signals and addressed to the communication device and the non-orthogonal signal extracted in the extracting step and addressed to the communication device.

### Claim 6

A radio communication method comprising the steps of:
receiving radio signals by a communication device, the radio signals including a plurality of non-orthogonal signals which are not orthogonal to each other and are transmitted by using part or all of orthogonal resources being a plurality of radio resources orthogonal to each other;
extracting, by the communication device, the orthogonal resource including the non-orthogonal signal addressed to the communication device from the received radio signals, and extracting, by the communication device, the non-orthogonal signal addressed to the communication device from a plurality of non-orthogonal signals included in the extracted orthogonal resource, by demodulating and canceling the radio signal addressed to another receiver; and
demodulating the extracted non-orthogonal signal addressed to the communication device by the communication device.