Spread-OFDM receiver
First Claim
1. A receiver, comprising:
- an Orthogonal Frequency Division Multiplexing (OFDM) demodulator configured to perform a first discrete Fourier transform (DFT) to demodulate a spread-OFDM signal transmitted from a user equipment (UE), to produce a plurality of demodulated data symbols corresponding to a plurality of OFDM subcarriers assigned to the UE; and
a DFT-based despreader configured to perform a second DFT to despread the demodulated data symbols to produce estimates of original data symbols, wherein the despreader employs a DFT despreading code corresponding to a DFT spreading code employed by the UE.
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Accused Products
Abstract
In a wireless communication system, a receiver comprises an Orthogonal Frequency Division Multiplexing (OFDM) demodulator configured to demodulate a spread-OFDM signal transmitted from a user equipment (UE) to produce demodulated data symbols corresponding to OFDM subcarriers assigned to the UE. A discrete Fourier transform (DFT)-based despreader is configured to despread the demodulated data symbols to produce estimates of original data symbols, wherein the despreader employs a DFT despreading code corresponding to a DFT spreading code employed by the UE to shape the spread-OFDM signal into a plurality of uniformly spaced pulse waveforms modulated with the original data symbols. A frequency-domain equalizer may be provided to equalize and/or spatial deumultiplex the demodulated data symbols before despreading.
295 Citations
31 Claims
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1. A receiver, comprising:
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an Orthogonal Frequency Division Multiplexing (OFDM) demodulator configured to perform a first discrete Fourier transform (DFT) to demodulate a spread-OFDM signal transmitted from a user equipment (UE), to produce a plurality of demodulated data symbols corresponding to a plurality of OFDM subcarriers assigned to the UE; and a DFT-based despreader configured to perform a second DFT to despread the demodulated data symbols to produce estimates of original data symbols, wherein the despreader employs a DFT despreading code corresponding to a DFT spreading code employed by the UE. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A base transceiver station, comprising:
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an Orthogonal Frequency Division Multiplexing (OFDM) demodulator configured to perform a first discrete Fourier transform (DFT) to demodulate a spread-OFDM signal transmitted from a user equipment (UE), to produce a plurality of demodulated data symbols corresponding to a plurality of OFDM subcarriers assigned to the UE; and a DFT-based despreader configured to perform a second DFT to despread the demodulated data symbols to produce despread original data symbols, wherein the despreader employs a DFT despreading code corresponding to a DFT spreading code employed by the UE to reduce peak-to-average power of the spread-OFDM signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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demodulating a spread-Orthogonal Frequency Division Multiplexing (OFDM) signal transmitted from a user equipment (UE) to produce a plurality of demodulated data symbols corresponding to a plurality of OFDM subcarriers assigned to the UE, wherein demodulating comprises performing a first discrete Fourier transform (DFT); providing for at least one of frequency-domain equalization and spatial demultiplexing of the plurality of demodulated data symbols to produce a plurality of equalized symbols; and performing a second DFT to provide for DFT-based despreading of the equalized symbols to produce estimates of original data symbols, wherein the despreading employs a DFT despreading code corresponding to a DFT spreading code employed by the UE. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. An apparatus comprising:
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a processor; and a memory coupled to the processor, the memory including a set of instructions stored therein and executable by the processor to; perform a first discrete Fourier transform (DFT) to demodulate a spread-Orthogonal Frequency Division Multiplexing (OFDM) signal transmitted from a user equipment (UE) to produce a plurality of demodulated data symbols corresponding to a plurality of OFDM subcarriers assigned to the UE; and perform a second DFT to provide for DFT-based despreading of the plurality of demodulated data symbols to produce estimates of original data symbols, wherein the despreading employs a DFT despreading code corresponding to a DFT spreading code employed by the UE to reduce peak-to-average power of the spread-OFDM signal. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification