OFDM signal spectrum shaping device and method for OFDM signal spectrum shaping
First Claim
Patent Images
1. An orthogonal frequency division multiplexing (OFDM) signal spectrum shaping device, comprising:
- an input interface configured to receive an input signal;
a modulation portion coupled to the input interface, configured to modulate the input signal to generate a plurality of uncompensated sub-carriers; and
a sub-carrier gain control module configured to apply a plurality of gain factors to the plurality of uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude;
wherein a different set of gain factors is used for each frequency hopping band.
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Abstract
An orthogonal frequency division multiplexing (OFDM) signal spectrum shaping device comprises an input interface configured to receive an input signal, a modulation portion coupled to the input interface, configured to modulate the input signal to generate a plurality of uncompensated sub-carriers, and a sub-carrier gain control module configured to selectively apply a plurality of gain factors to the plurality of uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude.
41 Citations
21 Claims
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1. An orthogonal frequency division multiplexing (OFDM) signal spectrum shaping device, comprising:
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an input interface configured to receive an input signal; a modulation portion coupled to the input interface, configured to modulate the input signal to generate a plurality of uncompensated sub-carriers; and a sub-carrier gain control module configured to apply a plurality of gain factors to the plurality of uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude;
wherein a different set of gain factors is used for each frequency hopping band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for shaping an orthogonal frequency division multiplexing (OFDM) signal spectrum, comprising:
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receive an input signal; at an orthogonal frequency division multiplexing (OFDM) communications device, modulating the input signal and generating generate a plurality of uncompensated sub-carriers; and at the orthogonal frequency division multiplexing (OFDM) communications device, applying a plurality of gain factors to the plurality of uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude;
wherein a different set of gain factors is used for each frequency hopping band. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A multi-band (MB) orthogonal frequency division multiplexing (OFDM) (MB-OFDM) transmitter to operate in a plurality of different hop bands, the transmitter comprising:
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modulation circuitry to generate a plurality of uncompensated sub-carriers that are modulated with input modulation symbols; and spectrum shaping circuitry to apply a plurality of gain factors to the uncompensated sub-carriers to generate a plurality of compensated sub-carriers that are substantially equal in amplitude to counter effects of gain variations in the different hop bands;
wherein a different set of gain factors is used for each of the different hop bands.
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Specification