Orthogonal frequency division multiplex systems
DCFirst Claim
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1. An OFDM system comprising:
- a transmitter configured to transmit an orthogonal frequency division multiplexing (OFDM) signal in which side lobes of said signal are suppressed by a pulse shaping operation performed by a pulse shaping mechanism on said signal, said pulse shaping operation causing a loss of carrier orthogonality; and
a receiver configured to receive said signal, said receiver comprising an equalizer configured to compensate for said loss of orthogonality.
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Abstract
A method and apparatus increase a maximum available bit rate on a single data link, in order to gain capacity within single cells. An orthogonal frequency division multiplex signal is filtered by a pulse shaping operation so as to suppress side lobes of the signal. This pulse shaping introduces known inter symbol interference (ISI) and loses orthogonality between subcarriers. However, a receiver utilizes the idea of overcoming ISI by applying equalization to the signal such that the loss of orthogonality is overcome.
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31 Claims
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1. An OFDM system comprising:
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a transmitter configured to transmit an orthogonal frequency division multiplexing (OFDM) signal in which side lobes of said signal are suppressed by a pulse shaping operation performed by a pulse shaping mechanism on said signal, said pulse shaping operation causing a loss of carrier orthogonality; and a receiver configured to receive said signal, said receiver comprising an equalizer configured to compensate for said loss of orthogonality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An OFDM receiver adapted to receive an OFDM signal in which side lobes of said signal are suppressed by pulse shaping, comprising:
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a receiver mechanism configured to receive said OFDM signal transmitted from a transmitter; and an equalizer adapted to compensate for a loss of carrier orthogonality induced by said pulse shaping. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for communicating an OFDM signal, comprising the steps of:
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forming at a transmitter said OFDM signal; pulse shaping said signal so as to reduce side lobes of said signal; transmitting said signal; receiving said signal at a receiver; and applying at said receiver said signal to an equalizer, comprising compensating for a loss of orthogonality of said signal. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification