FULL DUPLEX RADIO WITH ADAPTIVE RECEPTION POWER REDUCTION

• US 20170338853A1
• Filed: 08/11/2017
• Published: 11/23/2017
• Est. Priority Date: 02/12/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: HE, Gaoning, MASO, Marco
• Granted Patent: US 10,097,234 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 12/10 Current supply arrangements
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters

Abstract

A full duplex radio unit comprising a transmission unit, an antenna, a reception unit, a circulator and a power reduction unit is provided. The transmission unit is adapted to generate a first signal. The circulator is adapted to provide the first signal from the transmission unit to the antenna. The antenna is adapted to transmit the first signal and simultaneously receive a second signal using an identical frequency or frequency band. The circulator is adapted to provide a third signal to the power reduction unit, wherein the third signal comprises the second signal and interference generated from the first signal by the antenna and the circulator. The power reduction unit is adapted to reduce the power of the third signal by multiplying the third signal by factor of √ρ, wherein ρ is between zero and one, thereby generating a fourth signal.

Claims

1. A full duplex radio unit (2), comprising a transmission unit (3), an antenna (6), a reception unit (4), a circulator (5), and a power reduction unit (14),

wherein the transmission unit (3) is adapted to generate a first signal (20),

wherein the circulator is adapted to provide the first signal (20) from the transmission unit (3) to the antenna (6),

wherein the antenna (6) is adapted to transmit the first signal (20) and simultaneously receive a second signal (21) using an identical frequency or frequency band,

wherein the circulator (5) is adapted to provide a third signal (22) to the power reduction unit (14), wherein the third signal (22) comprises the second signal (21) and interference generated from the first signal (20) by the antenna (6) and the circulator (5),

wherein the power reduction unit (14) is adapted to reduce the power of the third signal (22) by multiplying the third signal with a factor of √

ρ

, wherein ρ

is between 0 and 1, thereby generating a fourth signal (23), and

wherein the reception unit (4) is adapted to receive the fourth signal (23).

2. The full duplex radio unit (2) according to claim 1,

wherein the full duplex radio unit (2) comprises an interference cancellation unit (9) adapted to generate at least one interference cancellation signal and to provide the at least one interference cancellation signal to the reception unit (4), and

wherein the reception unit (4) is adapted to cancel at least part of the interference by adding the interference cancellation signal to the fourth signal (23) or an intermediate signal derived from the fourth signal (23) by the reception unit (4).

3. The full duplex radio unit (2) according to claim 1,

wherein the power reduction unit (14) is adapted to determine and set the factor √

ρ

depending upon the transmission power of the first signal (20).

4. The full duplex radio unit (2) according to claim 2,

wherein the power reduction unit (14) is adapted to determine and set the factor √

ρ

depending upon a transmission power of the first signal (20) and/or a noise level and/or an interference level within the third signal, so that a pre-set target signal-to-interference-plus-noise-ratio SINR of the fourth signal (23) is reached.

5. The full duplex radio unit (2) according to claim 2,

wherein the power reduction unit (14) is adapted to determine and set the factor √

ρ

such that a signal-to-interference-plus-noise-ratio SINR of the fourth signal (23) is higher than a signal-to-interference-plus-noise-ratio SINR of the third signal (22).

6. The full duplex radio unit (2) according to claim 1,

wherein the power reduction unit (14) comprises a signal splitter (31) adapted to split the third signal (22) into the fourth signal (23) and a fifth signal (24),

wherein the signal splitter (31) is adapted to split the third signal (22) so that the fourth signal (23) is the third signal (22) multiplied by √

ρ and

the fifth signal (24) is the third signal (22) multiplied by √

(1−

ρ

).

7. The full duplex radio unit (2) according to claim 6,

wherein the power reduction unit (14) comprises an energy harvesting unit (10) adapted to harvest at least part of the energy of the fifth signal (24).

8. The full duplex radio unit (2) according to claim 7,

wherein the energy harvesting unit (10) is adapted to at least partially power the full duplex radio unit using the harvested energy of the fifth signal (24).

9. The full duplex radio unit (2) according to claim 7,

wherein the full duplex ratio unit (2) comprises a battery (12),

wherein the energy harvesting unit (10)is adapted to charge the battery (12) using the harvested energy of the fifth signal (24).

10. A full duplex radio transmission and reception method, comprising:

generating a first signal (20) by a transmission unit (3),

providing the first signal (20) to an antenna (6) by a circulator (5),

transmitting (100;

200) the first signal (20) by the antenna (6),

simultaneously receiving (100;

200) a second signal (21) using an identical frequency or frequency band as the first signal (20) by the antenna (6),

providing a third signal (22) by the circulator (5), wherein the third signal (22) comprises the second signal (21) and interference generated from the first signal (20) by the antenna (6) and the circulator (5),

reducing (101;

201) the power of the third signal (22) by multiplying the third signal (22) with a factor of √

ρ

, wherein ρ

is between 0 and 1, by a power reduction unit (14), thereby generating a fourth signal (23), and

receiving the fourth signal (23) by a reception unit (14).

11. The full duplex radio transmission and reception method according to claim 10,

comprising:

generating at least one interference cancellation signal, and

cancelling at least part of the interference by adding the interference cancellation signal to the fourth signal (23) or an intermediate signal derived from the fourth signal (23).

12. The full duplex radio transmission and reception method according to claim 10,

wherein ρ

is determined and set depending upon a transmission power of the first signal (20).

13. The full duplex radio transmission and reception method according to claim 11,

wherein the factor √

ρ

is determined and set depending upon the transmission power of the first signal (20) and/or a noise level and/or an interference level within the third signal, so that a pre-set target signal-to-noise-and-interference-ratio of the fourth signal (23) is reached.

14. The full duplex radio transmission and reception method according to claim 10,

wherein the third signal (22) is split into the fourth signal (23) and a fifth signal (24),

wherein the third signal (22) is split so that the fourth signal (23) is the third signal (22) multiplied by √

ρ and

the fifth signal (24) is the third signal (22) multiplied by √

(1−

ρ

).

15. The full duplex radio transmission and reception method according to claim 14,

wherein at least part of the energy of the fifth signal (24) is harvested.