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AssigneeKabushiki Kaisha Toshiba
InventorYasuhiko Tanabe
Estimating the term…
An estimation apparatus for estimating a channel response of a radio propagation path using a received signal including a first known signal, comprises a generator which generates a reference signal matrix, a calculator which calculates a generalized inverse matrix of the reference signal matrix including singular values which exceed a preset threshold value, an estimation unit configured to estimate an impulse response of the radio channel modeled using a transversal filter based on the first known signal and the generalized inverse matrix, and a converter which converts the estimated impulse response into a frequency-domain signal to acquire a frequency transfer function of the channel.
A method for estimating a channel response using a received OFDM signal, the method comprising:
An apparatus for estimating a channel response using a received OFDM signal, the apparatus comprising:
A receiver apparatus for use in an OFDM radio communication system, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Using sounding signals: with direct estimation from sounding signals
Using matrix methods: with inversion
Using matrix methods: eigen-space methods
Multicarrier modulation systems: arrangements specific to the receiver only
Term ended 18 Apr 2026 (estimated)
This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2003-433640, filed Dec. 26, 2003, the entire contents of which are incorporated herein by reference.
1. Field of the Invention
The present invention relates to a channel response estimation apparatus for estimating a channel response in an OFDM radio communication system, and a receiving device using the channel response estimation apparatus.
FIG. 1 is a block diagram illustrating an OFDM transmitter according to a first embodiment of the invention;
FIG. 2 is a block diagram illustrating an OFDM receiver according to the first embodiment of the invention;
FIG. 3 is a view illustrating the frequency map of an OFDM signal;
Embodiments of the invention will be described in detail with reference to the accompanying drawings.
Referring first to FIGS. 1 and 2, an OFDM radio communication system according to the present invention will be described. As seen from FIG. 1, in an OFDM transmitter included in the system, an encoder 101 subjects transmission data 100 to error correction encoding. The resultant encoded data is sent to a serial/parallel (S/P) converter 102, where it is divided into signals corresponding to the respective subcarriers of an OFDM signal. The resultant signals are input to a modulator 103, where they are subjected to digital modulation such as binary phase shift keying (BPSK).
The modulated signals are sent to an inverse fast Fourier transformer (IFFT) 104, where they are transformed into a time-domain signal by inverse fast Fourier transform. The output signal of the inverse fast Fourier transformer 104 is sent to a preamble/GI adder 105, where a preamble signal and guard interval (GI) are added to the signal. After that, the resultant signal is sent to a digital-to-analog (D/A) converter 106, where it is converted into an analog signal.