US 2014/0177741 A1 · OFDM or OFDMA signaling for ranging and data

Abstract

A communication device is operative to generate and orthogonal frequency division multiplexing (OFDM) symbol that includes one or more data and ranging modulation symbols. The data and ranging modulation symbols may be included within different sub-carriers of the OFDM symbol. The OFDM symbol is used to generate an OFDM symbol pair in the frequency domain (FDOM). After conversion from the FDOM to the time domain (TDOM), the OFDM symbol pair may then undergoes post-processing in the TDOM before transmission. Such post-processing may include the addition of cyclic prefix (CP) and cyclic suffix (CS) to the OFDM symbol pair in the TDOM as well as filtering using a window function. The OFDM symbol may be generated as an orthogonal frequency division multiple access (OFDMA) symbol, and two were more OFDM symbols or OFDMA symbols may be arranged in a frame.

Claims20

Dependent claims

A communication device comprising:

a processor configured to:
generate an orthogonal frequency division multiplexing (OFDM) symbol that includes one or more data modulation symbols within first one or more sub-carriers and one or more ranging modulation symbols within second one or more sub-carriers;
generate in frequency domain a frequency domain OFDM symbol pair using the OFDM symbol and a duplicate of the OFDM symbol;
convert the frequency domain OFDM symbol pair to a time domain OFDM symbol pair;
pre-pend a cyclic prefix to and post-pend a cyclic suffix to the time domain OFDM symbol pair to generate a modified time domain OFDM symbol pair;
and
filter the modified time domain OFDM symbol pair using a window function to generate a filtered time domain OFDM symbol pair;
and
a communication interface configured to transmit the filtered time domain OFDM symbol pair.

6 more elements

A communication device comprising:

a processor configured to:
generate a first orthogonal frequency division multiple access (OFDMA) symbol that includes first one or more data modulation symbols within first one or more sub-carriers and one or more ranging modulation symbols within second one or more sub-carriers;
generate in frequency domain a first frequency domain OFDMA symbol pair using the first OFDMA symbol and a duplicate of the first OFDMA symbol;
convert the first frequency domain OFDMA symbol pair to a first time domain OFDMA symbol pair;
generate a second OFDMA symbol that includes second one or more data modulation symbols within the first and second one or more sub-carriers;
generate in the frequency domain a second frequency domain OFDMA symbol pair using the second OFDMA symbol and a duplicate of the second OFDMA symbol;
convert the second frequency domain OFDMA symbol pair to a second time domain OFDMA symbol pair;
generate an OFDMA frame that includes the first and second time domain OFDMA symbol pairs;
and
a communication interface configured to transmit the OFDMA frame.

7 more elements

A method for execution by a communication device, the method comprising:

generating an orthogonal frequency division multiplexing (OFDM) symbol that includes one or more data modulation symbols within first one or more sub-carriers and one or more ranging modulation symbols within second one or more sub-carriers;
in frequency domain, generating a frequency domain OFDM symbol pair using the OFDM symbol and a duplicate of the OFDM symbol;
converting the frequency domain OFDM symbol pair to a time domain OFDM symbol pair;
pre-pending a cyclic prefix to and post-pending a cyclic suffix to the time domain OFDM symbol pair to generate a modified time domain OFDM symbol pair;
filtering the modified time domain OFDM symbol pair using a window function to generate a filtered time domain OFDM symbol pair;
and
transmitting the filtered time domain OFDM symbol pair via a communication interface of the communication device.

4 more elements

Dependencies are inferred from the claim text.

OFDM or OFDMA signaling for ranging and data

Life of this patent

OFDM or OFDMA signaling for ranging and data

Life of this patent

Abstract

Claims20