Reassignment of data among subcarriers in wireless data communication
First Claim
1. A data transmission system comprising:
- an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, whereinthe RF modules are connected to a processor by corresponding digital links;
the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and
the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal;
wherein the system is configured to extract from the received signal data identifying a correspondence between the one or more of the unused sub-carriers and the corresponding other sub-carriers.
1 Assignment
0 Petitions
Accused Products
Abstract
A data communication system has a station that includes multiple antenna elements. The station communicates to the antenna elements by way of digital data channels. Each antenna is connected to an RF module that receives data by way of a corresponding digital data channel, encodes and transmits the data. Adaptive beamforming may be performed for interference mitigation. Embodiments use the strength of pilot signals and/or error vector magnitudes as cost functions for an adaptive beamforming alogorithm such as optimum combining. Unused sub-carriers may be applied to provide in-band communication to facilitate channel switching, data reallocation and other interference mitigation strategies.
18 Citations
35 Claims
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1. A data transmission system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, wherein the RF modules are connected to a processor by corresponding digital links; the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the system is configured to extract from the received signal data identifying a correspondence between the one or more of the unused sub-carriers and the corresponding other sub-carriers. - View Dependent Claims (2, 3)
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4. A data transmission system comprising:
an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, wherein the RF modules are connected to a processor by corresponding digital links; the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal wherein the RF modules each comprise a frequency synthesizer and are each connected to receive an RF carrier reference signal from the processor and to supply the RF carrier reference signal as an input signal to the frequency synthesizer. - View Dependent Claims (5)
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6. A data transmission system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, wherein the RF modules are connected to a processor by corresponding digital links; the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal wherein the RF modules are configured to add a beacon signal to a transmitted signal on one or more of the unused sub-carriers in order to facilitate the adaptation of a smart antenna system receiving the transmitted signal. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A data communication system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, and an adaptive antenna processor configured to perform adaptive beamforming; wherein;
the RF modules are connected to a processor by corresponding digital links;the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the adaptive beamforming is performed in response to a cost function; and
,wherein the adaptive beamforming implements an optimal combining algorithm. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A data communication system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, and an adaptive antenna processor configured to perform adaptive beamforming; wherein;
the RF modules are connected to a processor by corresponding digital links;the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the adaptive beamforming is performed in response to a cost function; and
,wherein the cost function comprises a measure of one or more beacon signals appended to the received signal, or error vector magnitudes from the detection of OFDM symbols in the received signal, or a combination of these. - View Dependent Claims (21)
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22. A data communication system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, and an adaptive antenna processor configured to perform adaptive beamforming; wherein;
the RF modules are connected to a processor by corresponding digital links;the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the adaptive beamforming is performed in response to a cost function; and
,wherein the cost function comprises a measure of one or more pilot signals carried on one or more of the unused sub-carriers. - View Dependent Claims (23)
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24. A data communication system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, and an adaptive antenna processor configured to perform adaptive beamforming; wherein;
the RF modules are connected to a processor by corresponding digital links;the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the adaptive beamforming is performed in response to a cost function; and
,wherein the cost function comprises a measure of a beacon signal that is unique to a user such that signals which include a beacon signal of one user can be distinguished from other signals. - View Dependent Claims (25)
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26. A data communication system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, and an adaptive antenna processor configured to perform adaptive beamforming; wherein;
the RF modules are connected to a processor by corresponding digital links;the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the adaptive beamforming is performed in response to a cost function; and
,wherein the cost function comprises a measure of a beacon signal and the beacon signal carries in-band control signals for antenna adaptation. - View Dependent Claims (27)
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28. A data transmission system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, wherein the RF modules are connected to a processor by corresponding digital links; the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the system is configured to reassign data from one or more sub-carriers in a transmit signal to be transmitted by the antenna system to one or more corresponding ones of the unused sub-carriers in response to a quality measure for the one or more sub-carriers of the transmit signal. - View Dependent Claims (29, 30)
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31. A data transmission system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, wherein the RF modules are connected to a processor by corresponding digital links; the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the system is configured to share control information regarding the reassignment of data from sub-carriers to corresponding unused sub-carriers with endpoints of a communication network by way of in-band control signals. - View Dependent Claims (32, 33)
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34. A data transmission system comprising:
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an antenna system comprising one or more RF modules, each of the RF modules connected to one or more antenna elements, wherein the RF modules are connected to a processor by corresponding digital links; the system is configured to transmit and receive data on a plurality of sub-carriers in an OFDM scheme, the plurality of sub-carriers comprising one or more sub-carriers specified as being unused according to an OFDM protocol; and the system is configured to process a signal received at the antenna system to yield a modified receive signal by reassigning data from one or more of the unused sub-carriers of the receive signal to one or more corresponding other sub-carriers before processing the receive signal according to the OFDM protocol to extract received data from the modified receive signal; wherein the system is in data communication with an endpoint and the system is configured to independently determine a reassignment of data from one or more of the sub-carriers to corresponding ones of the unused sub-carriers based on information common to the system and the endpoint. - View Dependent Claims (35)
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Specification