TRANSMITTER, RECEIVER, AND SEMICONDUCTOR CHIP

• US 20180034521A1
• Filed: 02/09/2016
• Published: 02/01/2018
• Est. Priority Date: 02/10/2015
• Status: Active Grant

• Current Assignee: NHK Engineering System, inc., Nippon Hoso Kyokai
• Original Assignee: NHK Engineering System, inc., Nippon Hoso Kyokai
• Inventors: ASAKURA, Shingo, HONDA, Madoka, MURAYAMA, Kenichi, SHITOMI, Takuya, SAITO, Susumu, NARIKIYO, Yoshikazu, MIYASAKA, Hiroaki, SATOU, Akihiko, TAKEUCHI, Tomoaki, TSUCHIDA, Kenichi, OKANO, Masahiro, TAKADA, Masayuki, SHIBUYA, Kazuhiko
• Granted Patent: US 10,009,078 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 9/0858 Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding

Abstract

Disclosed is a MIMO system including a transmitter and a receiver, in which an overall BER characteristic is improved. The transmitter (1) maps data, distributed among transmit antennas, onto an IQ plane to generate carrier symbols, and then, applies an inter-polarization interleave processing in a time direction to the carrier symbols between the transmit antennas, to generate OFDM signals. Receiving the OFDM signals, the receiver (2) demodulates the OFDM signals to generate complex baseband signals, and after that, applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data. Further, the receiver (2) applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data and applies a second deinterleave processing between the receive antennas to the plurality of sets of MIMO separated data, so as to generate carrier symbols.

Claims

1. A transmitter that generates OFDM signals to be transmitted through a plurality of transmit antennas, comprising:

a data distributor that distributes data to each of the transmit antennas;

a mapper that maps the data distributed by the data distributor, onto an IQ plane, to generate carrier-modulated carrier symbols;

an inter polarization interleaver that decomposes the carrier symbols into I data and Q data, which are respectively arranged on an I coordinate axis and a Q coordinate axis on the IQ plane, and thereafter, generates inter-polarization interleaved data in which an order of the I data or that of the Q data is rearranged between the plurality of transmit antennas according to a predetermined rule;

a time interleaver that applies an interleave processing in a time direction to the inter-polarization interleaved data for each of the transmit antennas to generate time-interleaved data; and

an OFDM output processor that generates OFDM signals corresponding to the inter-polarization interleaved data.

2. A receiver that demodulates OFDM signals received through a plurality of receive antennas, comprising:

an OFDM input processor that demodulates the OFDM signals to generate complex baseband signals;

a time deinterleaver that applies a first deinterleave processing in a time direction to the complex baseband signals to generate time deinterleaved data;

a MIMO detector that applies a MIMO separation processing to the time deinterleaved data to generate a plurality of sets of MIMO separated data; and

a data inter-polarization deinterleaver that rearranges an order of odd numbered data or that of even numbered data in respect to the plurality of sets of MIMO separated data received from the MIMO detector, between the receive antennas according to a predetermined rule, and thereafter, generates carrier symbols as I data and Q data, wherein the I data and the Q data are adjacent to each other and respectively arranged on an I coordinate axis and a Q coordinate axis on an IQ plane.

3. A semiconductor chip that generates OFDM signals to be transmitted through a plurality of transmit antennas, comprising:

a data distributor that distributes data to each of the transmit antennas;

a mapper that maps, onto an IQ plane, the data distributed by the data distributor, and generates carrier-modulated carrier symbols;

an inter-polarization interleaver that decomposes the carrier symbols into I data and Q data, which are respectively arranged on an I coordinate axis and a Q coordinate axis on the IQ plane, and thereafter, generates inter-polarization interleaved data in which an order of the I data or that of the Q data is rearranged between the transmit antennas according to a predetermined rule;

a time interleaver that applies an interleave processing in a time direction to the inter-polarization interleaved data for each of the transmit antennas to generate time interleaved data; and

an OFDM output processor that generates OFDM signals corresponding to the inter-polarization interleaved data.

4. A semiconductor chip that demodulates OFDM signals received through a plurality of receive antennas, comprising:

an OFDM input processor that demodulates the OFDM signals to generate complex baseband signals;

a time deinterleaver that applies a first deinterleave processing in a time direction to the complex baseband signals so as to generate time deinterleaved data;

a MIMO detector that applies a MIMO separation processing to the time deinterleaved data so as to generate a plurality of sets of MIMO separated data;

a data inter-polarization deinterleaver that rearranges an order of odd numbered data or that of even numbered data in respect to the plurality of sets of MIMO separated data received from the MIMO detector, between the plurality of receive antennas according to a predetermined rule, and thereafter, generates carrier symbols as I data and Q data, wherein the I data and the Q data are adjacent to each other and respectively arranged on an I coordinate axis and a Q coordinate axis on an IQ plane.