# US 2013/0155989 A1 · Transmission method

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- Number: US 2013/0155989 A1
- Document ID: US20130155989A1
- Status: Published application
- Kind: A1
- Application number: 13/770,199
- Filed: 2013-02-19
- Published: 2013-06-20
- Earliest claimed: 2002-07-16
- Assignees: Panasonic Corporation
- Inventors: Yutaka Murakami; Masayuki Orihashi; Akihiko Matsuoka; Yoichi Nakagawa
- Web page: https://patentgrep.com/patent/US20130155989A1

## CPC

- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04B 7/0413: MIMO systems
- H04B 7/0417: Feedback systems
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04B 7/0613: {using simultaneous transmission (H04B7/0686 takes precedence)}
- H04B 7/0837: {using pre-detection combining (H04B7/0868 takes precedence)}
- H04L 25/0204: {of multiple channels}
- H04L 25/0224: {using sounding signals}
- H04L 27/2657: {Carrier synchronisation}
- H04L 27/2662: {Symbol synchronisation}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A transmission method includes generating a plurality of orthogonal frequency division multiplexing (OFDM) signals, each signal including different data and some of the plurality of OFDM signals including pilot symbols. The pilot symbols are assigned to a predetermined subcarrier in predetermined time. At least one of the plurality of OFDM signals is assigned the pilot symbols to the predetermined subcarrier in the predetermined time, and other OFDM signals are assigned data to the predetermined subcarrier in the predetermined time. The method further includes converting each of the plurality of OFDM signals to a radio signal and transmitting each of the radio signals from a different antenna.

## Claims

### Claim 1

A transmission method comprising:
generating a plurality of orthogonal frequency division multiplexing (OFDM) signals, each signal including different data;
some of the plurality of OFDM signals include pilot symbols;
the pilot symbols are assigned to a predetermined subcarrier in predetermined time;
at least one of the plurality of OFDM signals is assigned the pilot symbols to the predetermined subcarrier in the predetermined time, and other OFDM signals are assigned data to the predetermined subcarrier in the predetermined time,
converting each of the plurality of OFDM signals to a radio signal; and
transmitting each of the radio signals from a different antenna.

### Claim 2 (depends on 1)

The transmission method according to claim 1, wherein the predetermined subcarriers in the predetermined time assigned the pilot symbols, are different subcarriers in the predetermined time of the each OFDM signal.

### Claim 3 (depends on 1)

The transmission method according to claim 1, wherein at least one of the plurality of the OFDM signals does not include pilot symbols in the predetermined time.