Leakage cancellation a multiple-input multiple-output transceiver

Patent metadata

Field	Value
Publication number	US-2016156381-A1
Application number	US-201314897059-A
Country	US
Kind code	A1
Filing date	Jun 18, 2013
Priority date	Jun 18, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

A transceiver 100 for simultaneous transmission and reception of communication signals in a multiple-input multiple-output, MIMO, system allowing operation on at least partly overlapping frequency bands. The transceiver 100 comprising an antenna arrangement 110 , a duplex arrangement 120 , and a modem unit 130 . The duplex arrangement 120 being adapted to forward a transmit signal T 1 from the modem unit to the antenna arrangement 110 . The duplex arrangement 120 also being adapted to receive a receive signal R 1 from the antenna arrangement 110 and to forward an interference suppressed receive signal R 2 to the modem unit. The duplex arrangement 120 comprising an interference cancellation unit adapted to generate the interference suppressed receive signal R 2 by combining the receive signal R 1 from the antenna arrangement and the transmit signal T 1.

First claim

1 . A transceiver for simultaneous transmission and reception of communication signals in a multiple-input multiple-output (MIMO) system, the transceiver comprising:
an antenna arrangement, a duplex arrangement, and a modem unit, the duplex arrangement being adapted to receive a transmit signal from the modem unit, transmit a first part of the transmit signal to the antenna arrangement, and receive a receive signal from the antenna arrangement, the duplex arrangement comprising an interference cancellation (IC) unit adapted to generate an interference suppressed receive signal by combining the receive signal and the transmit signal, and the duplex arrangement being further adapted to transmit the interference suppressed receive signal to the modem unit.

2 . The transceiver of claim 1 , wherein the receive signal occupying a first frequency band, the first part of the transmit signal occupying a second frequency band, and wherein the first and second frequency bands are at least partly overlapping, the transceiver thus being arranged to simultaneously transmit and receive communication signals in a MIMO system on at least partly overlapping frequency bands.

3 . The transceiver of claim 1 , wherein the antenna arrangement is part of a Line Of Sight (LOS) multiple-input multiple output (MIMO) antenna arrangement, and wherein the transmit and receive signals comprises a plurality of data streams, arranged to be transmitted over a plurality of LOS-MIMO channels.

4 . The transceiver of claim 1 , wherein the IC unit comprises at least one duplex coupler arranged to connect the antenna arrangement to at least one modulator and at least one demodulator comprised in the modem unit, the duplex coupler being arranged to forward part of the transmit signal from the at least one modulator to the antenna arrangement as the first part of the transmit signal, and also to forward the receive signal from the antenna arrangement to the at least one demodulator as the interference suppressed receive signal, wherein the interference suppressed receive signal is arranged to be isolated from the transmit signal.

5 . The transceiver of claim 1 , wherein
the IC unit comprises a set of adaptive filters arranged to receive and to filter a second part of the transmit signal received from the modem unit to generate a set of filtered transmit signals, the IC unit further being adapted to combine the receive signal with the set of filtered transmit signals to generate the interference suppressed receive signal, the set of adaptive filters being arranged to have transfer functions determined by a control signal, the transceiver further comprising a control unit adapted to generate the control signal, which control signal is arranged to determine the transfer functions of the set of adaptive filters, the control signal having a setting to reduce the power of an interference signal comprised in the interference suppressed receive signal, and said interference signal originating at least in part from the transmit signal.

6 . The transceiver of claim 5 , wherein the adaptive filters are arranged to receive and to filter a second part of the transmit signal received from the modem unit via the duplex coupler.

7 . The transceiver of claim 1 , wherein
the duplex arrangement comprises a polarization diplexer connected to the antenna arrangement, the polarization diplexer being arranged to receive the receive signal from the antenna arrangement, and to split the receive signal into horizontal and vertical receive components, as well as to output horizontal and vertical receive components on horizontal and vertical polarization ports as first and second receive signals, respectively, the horizontal and vertical polarization ports being connected to first and second IC units, respectively, the first IC unit being adapted to receive a first transmit signal and a second transmit signal from the modem unit and to forward a first part of the first transmit signal to the horizontal polarization port, the second IC unit also being adapted to receive the first transmit signal and the second transmit signal from the modem unit and to forward a first part of the second transmit signal to the vertical polarization port, the first IC unit being adapted to receive the first receive signal from the horizontal polarization port and to generate a first interference suppressed receive signal by processing and combining the first and second transmit signal with the first receive signal, the second IC unit being adapted to receive the second receive signal from the vertical polarization port and to generate a second interference suppressed receive signal by processing and combining the first and second transmit signal with the second receive signal, and the first and second IC units further being adapted to forward said first and second interference suppressed receive signals, respectively, to the modem unit.

8 . The transceiver of claim 1 , wherein the antenna arrangement comprises first and second antenna units disposed a pre-determined distance apart, the duplex arrangement comprising first and second IC units, the first and second IC unit being adapted to receive a first transmit signal and a second transmit signal, respectively, from the modem unit, the first IC unit being adapted to forward a first part of the first transmit signal to the first antenna unit, the second IC unit being adapted to forward a first part of the second transmit signal to the second antenna unit, the first IC unit being adapted to receive a first receive signal from the first antenna unit and to generate a first interference suppressed receive signal by processing and combining the first transmit signal with the first receive signal, the second IC unit being adapted to receive a second receive signal from the second antenna unit and to generate a second interference suppressed receive signal by processing and combining the first transmit signal with the second receive signal, the first and second IC units further being adapted to forward said first and second interference suppressed receive signals to the modem unit, respectively, said interference signals originating from the first and second transmit signal.

9 . The transceiver of claim 8 , wherein the first and second IC units are arranged to receive also the second and the first transmit signal, respectively, and to suppress an interference signal by processing and combining the second transmit signal with the first receive signal and the first transmit signal with the second receive signal, respectively, to generate the first and the second interference suppressed receive signal, respectively.

10 . The transceiver of claim 1 , wherein the first part of the transmit signal arranged to pass from the duplex arrangement to the antenna arrangement, is passed over the same physical interface as the receive signal arranged to pass from the antenna arrangement to the duplex arrangement interface to the antenna arrangement.

11 . The transceiver of claim 1 , wherein the first part of the transmit signal arranged to pass from the duplex arrangement to the antenna arrangement, and the receive signal arranged to pass from the antenna arrangement to the duplex arrangement are transmitted and received via separate physical interfaces to the antenna arrangement.

12 . The transceiver of claim 11 , wherein the IC unit comprises an antenna port, a transmit port, a receive port, and a control port, the IC unit further comprising a duplex coupler, and a first adaptive filter, the duplex coupler being arranged to receive a transmit signal on the transmit port, and to forward a first part of the transmit sig

Assignees

• Ericsson Telefon Ab L M

Inventors

• Rydström Mats
• Coldrey Mikael
• Tageman Ola

Classifications

• H04B1/10

  Means associated with receiver for limiting or suppressing noise or interference · CPC title

• H04L5/14

  Two-way operation using the same type of signal, i.e. duplex · CPC title

• H04B1/525 Primary

  with means for reducing leakage of transmitter signal into the receiver · CPC title

• H04B7/0413

  MIMO systems · CPC title