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US 2011/0216786 A1Published application
Ofdm system and method employing ofdm symbols with known or information-containing prefixes
AssigneeNortel Networks Limited
InventorsShiquan WU, Wen TONG, Claude ROYER, Peiying ZHU
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Abstract
Systems and methods for transmitting and receiving OFDM symbols are provided which enable the otherwise wasted transmission time normally used as a prefix for each OFDM symbol to contain useful information. At the receiver, the received signal is processed to convert received OFDM symbols from a linear convolution with the channel to a cyclic convolution.
Claims27
1-78. (canceled)
A method comprising:
- transmitting a signal comprising a non-OFDM segment containing known and/or unknown highly reliable data and an OFDM data segment before and/or after the non-OFDM segment by transmitting a slot structure comprising in sequence:
- a first data segment;
- a first non-OFDM segment containing known data and/or unknown highly reliable data;
- at least one second data segment;
- a second non-OFDM segment containing known data and/or unknown highly reliable data;
- a third data segment;
- wherein at least one of the data segments is an OFDM data segment and at least one of the data segments is a CDMA data segment.
4 more elements
A method comprising:
- transmitting a signal comprising a non-OFDM segment containing known and/or unknown highly reliable data and an OFDM data segment before and/or after the non-OFDM segment by transmitting a slot structure comprising in sequence:
- a first data segment;
- a first non-OFDM segment containing known data and/or unknown highly reliable data;
- at least one second data segment;
- a second non-OFDM segment containing known data and/or unknown highly reliable data;
- a third data segment;
- wherein each data segment is an OFDM data segment.
4 more elements
A transmitter comprising:
- a first transmit antenna;
- OFDM signal generating circuitry for generating OFDM symbols for transmission;
- non-OFDM signal generating circuitry for generating non-OFDM segments;
- wherein the OFDM signal generating circuitry and the non-OFDM signal generating circuitry transmit a signal comprising a non-OFDM segment containing known and/or unknown highly reliable data and an OFDM data segment before and/or after the non-OFDM segment by transmitting a slot structure comprising in sequence:
- a first data segment;
- a first non-OFDM segment containing known data and/or unknown highly reliable data;
- at least one second data segment;
- a second non-OFDM segment containing known data and/or unknown highly reliable data;
- a third data segment;
- wherein at least one of the data segments is an OFDM data segment and at least one of the data segments is a CDMA data segment.
7 more elements
A transmitter comprising:
- a first transmit antenna;
- OFDM signal generating circuitry for generating OFDM symbols for transmission;
- non-OFDM signal generating circuitry for generating non-OFDM segments;
- wherein the OFDM signal generating circuitry and the non-OFDM signal generating circuitry transmit a signal comprising a non-OFDM segment containing known and/or unknown highly reliable data and an OFDM data segment before and/or after the non-OFDM segment by transmitting a slot structure comprising in sequence:
- a first data segment;
- a first non-OFDM segment containing known data and/or unknown highly reliable data;
- at least one second data segment;
- a second non-OFDM segment containing known data and/or unknown highly reliable data;
- a third data segment;
- wherein each data segment is an OFDM data segment.
7 more elements
Dependencies are inferred from the claim text.