Cyclic diversity systems and methods
OwnerMark A. Webster, Michael J. Sealsinventors
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Abstract
Embodiments of cyclic diversity systems and methods are disclosed. One system embodiment, among others, comprises a logic configured to cyclically advance, or perform the periodic equivalent of the same, one or more sections of an orthogonal frequency division multiplexing (OFDM) packet relative to the OFDM packet to be transmitted on a first transmit antenna, the packet having the one or more cyclically advanced sections to be transmitted on a second transmit antenna, the duration of the cyclic advance having a duration less than a guard interval.
Claims21
A method for transmitting orthogonal frequency division multiplexing (OFDM) signals comprising:
- generating a first OFDM packet for transmission including a guard interval portion and a symbol data portion each comprised of a plurality of samples;
- cyclically advancing the first OFDM packet by shifting the samples in a first direction an amount less than a sample duration of the guard interval portion to generate a shifted version of the first OFDM packet for transmission in which at least a non-zero number of the samples from the symbol data portion of the first OFDM packet are shifted into the guard interval portion of the shifted version and a same non-zero number of samples from the guard interval portion of the first OFDM packet are shifted out of the guard interval portion of the shifted version;
- and
- substantially simultaneously transmitting the first OFDM packet and the shifted version of the OFDM packet.
A signal transmitting system for transmitting orthogonal frequency division multiplexing (OFDM) signals comprising:
- a first transmit processor for generating a first OFDM packet for transmission including a guard interval portion and a symbol data portion each compromised of a plurality of samples;
- a second transmit processor for cyclically advancing the first OFDM packet by shifting the samples in a first direction an amount less than a sample duration of the guard interval portion to generate a shifted version of the first OFDM packet for transmission in which at least a non-zero number of the samples from the symbol data portion of the first OFDM packet are shifted into the guard interval portion of the shifted version and a same non-zero number of samples from the guard interval portion of the first OFDM packet are shifted out of the guard interval portion of die shifted version;
- a plurality of radio transmitters for converting the OFDM packet and the shifted version of the OFDM packet to corresponding radio signals;
- and
- a plurality of radio antennas correspondingly coupled to the plurality of radio transmitters for transmitting the radio signals;
- wherein the first transmit processor and the second transmit processor are configured to substantially simultaneously cause the transmission of the first OFDM packet and the shifted version of the OFDM packet via corresponding transmitters and antennas.
A signal transmitting system for transmitting orthogonal frequency division multiplexing (OFDM) signals comprising:
- means for generating a first OFDM packet for transmission including a guard interval portion and a symbol data portion each compromised of a plurality of samples;
- means for cyclically advancing the first OFDM packet including a guard interval portion and a symbol data portion each compromised of a plurality of samples by shifting the samples in a first direction an amount less than a sample duration of the guard interval portion to generate a shifted version of the first OFDM packet for transmission in which at least a non-zero number of the samples from the symbol data portion of the first OFDM packet we shifted into the guard interval portion of the shifted version and a same non-zero number of samples from the guard interval portion of the first OFDM packet are shifted out of the guard interval portion of the shifted version;
- means for convening the first OFDM packet and the shifted version of the OFDM packet to corresponding radio signals;
- and
- means for substantially simultaneously causing the transmission of the first OFDM packet and the shifted version of the OFDM packet.
Dependencies are inferred from the claim text.