Multicarrier transmit diversity
First Claim
1. A communication device, comprising:
- a symbol encoder configured to encode information bits into frequency domain data corresponding to multicarrier frequency domain symbols (MFDSs);
an encoder configured to generate modified frequency domain data when the communication device is operating in a diversity transmission mode, the modified frequency domain data comprising re-ordered complex conjugate data corresponding to the frequency domain data;
a converter configured to i) convert the frequency domain data to a first time domain signal, and ii) convert the modified frequency domain data to a second time domain signal when the communication device is operating in the diversity transmission mode;
a first radio frequency (RF) transmitter configured to transmit the first time domain signal;
a second RF transmitter configured to i) transmit the second time domain signal when the communication device is operating in the diversity transmission mode, and ii) not transmit the second time domain signal when the communication device is operating in a legacy mode; and
logic circuitry configured to control operation of the communication device according to one of a plurality of transmission modes comprising the diversity transmission mode and the legacy mode.
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Accused Products
Abstract
Method, apparatus, and data packet format to implement transmit diversity in a multicarrier environment is disclosed. For diversity transmission operations, space frequency encoding techniques are employed creating distinguishable first and second time domain signals from a multicarrier frequency domain symbol bearing data of interest, which are then broadcast in parallel over first and second transmission units respectively. For diversity reception operations, complementary space frequency decoding is used to recover a corrected multicarrier frequency domain symbol from a time domain signal containing either this symbol, a space frequency modified symbol based on the multicarrier symbol, or a possible partial/complete combination of both. The data packet format includes portions defining a transmission diversity semaphore, a preamble enabling training of a receiver receiving the data packet, and a payload.
34 Citations
25 Claims
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1. A communication device, comprising:
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a symbol encoder configured to encode information bits into frequency domain data corresponding to multicarrier frequency domain symbols (MFDSs); an encoder configured to generate modified frequency domain data when the communication device is operating in a diversity transmission mode, the modified frequency domain data comprising re-ordered complex conjugate data corresponding to the frequency domain data; a converter configured to i) convert the frequency domain data to a first time domain signal, and ii) convert the modified frequency domain data to a second time domain signal when the communication device is operating in the diversity transmission mode; a first radio frequency (RF) transmitter configured to transmit the first time domain signal; a second RF transmitter configured to i) transmit the second time domain signal when the communication device is operating in the diversity transmission mode, and ii) not transmit the second time domain signal when the communication device is operating in a legacy mode; and logic circuitry configured to control operation of the communication device according to one of a plurality of transmission modes comprising the diversity transmission mode and the legacy mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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controlling a transmission operation of a communication device according to one of a plurality of transmission modes comprising at least a diversity transmission mode and a legacy mode; encoding, at the communication device, information bits into frequency domain data corresponding to multicarrier frequency domain symbols (MFDSs); generating, at the communication device, modified frequency domain data when the communication device is operating in the diversity transmission mode; converting, at the communication device, the frequency domain data to a first time domain signal; converting, at the communication device, the modified frequency domain data to a second time domain signal when the communication device is operating in the diversity transmission mode; transmitting, with the communication device, the first time domain signal; transmitting, with the communication device, the second time domain signal when the communication device is operating in the diversity transmission mode; and not transmitting, with the communication device, the second time domain signal when the communication device is operating in a legacy mode. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A communication device, comprising:
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logic circuitry configured to control operation of the communication device according to one of a plurality of reception modes comprising a diversity mode and a legacy mode; a radio frequency (RF) receiver configured to downconvert a received RF signal to a time domain signal; a converter configured to convert the time domain signal to first frequency domain data corresponding to multicarrier frequency domain symbols (MFDSs); a decoder configured to, when the communication device is operating in the diversity mode; treat the first frequency domain data as composite data corresponding to a plurality of transmit signals having been transmitted in a transmit diversity mode, including treating the first frequency domain data as a composite of original frequency domain data and re-ordered subcarrier complex conjugates of the original frequency domain data, and decode the composite data to generate corrected second frequency data; and a symbol decoder configured to i) decode the first frequency domain data to generate information bits when the communication device is operating in the legacy mode, and ii) decode the corrected second frequency domain data to generate information bits when the communication device is operating in the diversity mode. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method, comprising:
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controlling operation of a communication device according to one of a plurality of reception modes comprising a diversity mode and a legacy mode; downconverting, at the communication device, a received radio frequency (RF) signal to a time domain signal; converting, at the communication device, the time domain signal to first frequency domain data corresponding to multicarrier frequency domain symbols (MFDSs); treating, at the communication device, the first frequency domain data as composite data corresponding to a plurality of transmit signals having been transmitted in a transmit diversity mode when the communication device is operating in the diversity mode; decoding, at the communication device, the composite data to generate corrected second frequency data when the communication device is operating in the diversity mode; decoding the first frequency domain data to generate information bits when the communication device is operating in the legacy mode; and decoding the corrected second frequency domain data to generate information bits when the communication device is operating in the diversity mode. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification