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US 7,382,719 B2Granted
Scalable and backwards compatible preamble for OFDM systems
AssigneeTexas Instruments Incorporated
InventorsSrikanth Gummadi, Srinath Hosur, Peter Murphy
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Abstract
A method comprising encoding a plurality of signals according to a predetermined negation scheme and transmitting the plurality of signals, wherein each signal is transmitted by way of a wireless channel. The method further comprises receiving a signal, wherein the received signal is a combination of the plurality of transmitted signals, and interpolating between data in the received signal to generate a plurality of systems of equations. The method further comprises solving the plurality of systems of equations to determine a gain and phase shift applied to each of the plurality of transmitted signals by a corresponding wireless channel.
Claims19
A method, comprising:
- encoding a plurality of signals according to a predetermined negation scheme;
- transmitting said plurality of signals, each signal transmitted by way of a wireless channel;
- receiving a signal, wherein said signal is a combination of the plurality of transmitted signals;
- interpolating between data in the received signal to generate a plurality of systems of equations;
- and
- solving the plurality of systems of equations to determine a gain and phase shift applied to each of the plurality of transmission signals by a corresponding wireless channel;
- wherein encoding the plurality of signals comprises negating odd tones of negative frequency and even tones of positive frequency.
4 more elements
A system, comprising:
- a receiver that generates a plurality of equations based on data in a received signal and by interpolating between data in said received signal;
- and
- at least two transmitters, each transmitter is wirelessly coupled to the receiver and transmits at least one signal by way of a wireless channel, said at least one signal encoded according to a predetermined negation scheme;
- wherein the receiver solves the plurality of equations to determine a gain and phase shift applied to each transmitted at least one signal by a corresponding wireless channel;
- wherein said at least one signal is encoded according to the predetermined negation scheme by negating even tones of negative frequency and odd tones of positive frequency.
2 more elements
A system, comprising:
- a plurality of transmitters, each transmitter transmits by way of a wireless channel a set of frequency tones encoded according to a predetermined negation scheme;
- and
- a receiver wirelessly coupled to each of the plurality of transmitters, said receiver generates equations based on data and interpolations between said received data;
- wherein the receiver solves the equations to determine a gain and phase shift applied to each set of transmitted frequency tones by a corresponding wireless channel;
- wherein each transmitter is able to encode the set of frequency tones according to the predetermined negation scheme by negating odd tones of negative frequency and even tones of positive frequency;
- wherein each transmitter is able to encode the set of frequency tones according to the predetermined negation scheme by negation even tones of negative frequency and odd tones of positive frequency.
3 more elements
A receiver wirelessly coupled to a transmitter, comprising:
- a processor that generates a plurality of equations based on data in a received signal and by interpolating between data in said received signal;
- and
- a memory coupled to said processor;
- wherein the processor solves the plurality of equations to determine a phase shift and gain applied to a transmitted signal, said transmitted signal encoded according to a predetermined negation scheme;
- wherein the processor stores said phase shift and gain in memory;
- wherein the transmitted signal is encoded according to the predetermined negation scheme by negating alternating tones of negative frequency.
3 more elements
A system, comprising:
- means for transmitting a plurality of preambles, each preamble comprising at least one set of frequency tones encoded according to a predetermined negation scheme;
- and
- means for receiving coupled by way of a wireless channel to the means for transmitting, said means for receiving generates a plurality of equations based on received frequency tones and interpolations between said received frequency tones;
- wherein the means for receiving solves the plurality of equations to determine a phase shift and gain applied to each of the at least one set of frequency tones by the wireless channel;
- wherein the at least one set of frequency tones is encoded according to the predetermined negation scheme by negating alternating tones of positive frequency.
2 more elements
Dependencies are inferred from the claim text.