US 6,151,372 AGranted

Diversity receiver

AssigneeNEC Corporation

InventorTakeshi Yamamoto

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Abstract

A diversity receiver is disclosed with an object to improve deteriorated transmission due to fading even when frequency selective fading resulting from multipaths occurs in a propagation path. The diversity receiver is provided with two lines, each line comprising an antenna, an orthogonal detector, first sampling and quantizing means, second sampling and quantizing means, a serial-parallel conversion circuit, and a Fourier transform circuit. In each of the lines, a modulated signal transmitted from a transmitter is received and processed. In a diversity processing unit, optimal diversity processing for each subcarrier is performed using the received and processed signals in respective lines. In this manner, an improvement is made in deteriorated transmission quality due to multipath fading between the receiver and the transmitter for transmitting OFDM modulated signals.

Claims11

Dependent claims

A diversity receiver comprising:

two antennas for receiving a modulated signal transmitted from a transmitter;
two orthogonal detectors, each of said orthogonal detectors for converting the modulated signal received through one of said two antennas into an complex analogue baseband signal and outputting the converted signal;
two sets of sampling and quantizing means, each set of said sampling and quantizing means for sampling and quantizing the complex analogue baseband signal provided from one of said two orthogonal detectors;
two serial-parallel conversion circuits, each of said serial-parallel conversion circuits for serial-parallel converting the baseband signal sampled and quantized at one of said two sets of sampling and quantizing means;
two Fourier transform circuits, each of said Fourier transform circuits for Fourier transforming the baseband signal serial-parallel converted at one of said two serial-parallel conversion circuits to separate the modulated signal transmitted from the transmitter into signals for each subcarrier;
a diversity processing unit for performing optimal diversity processing for each subcarrier using two signals provided from said two Fourier transform circuits;
a parallel-serial conversion circuit for parallel-serial converting the signal diversity processed at said diversity processing unit to generate I, Q signals in time series;
and
a demodulator for demodulating the I, Q signals generated at said parallel-serial conversion circuit and outputting the demodulated signal as demodulated data.

6 more elements

Dependencies are inferred from the claim text.