Apparatus and method for estimating a signal power to interference power ratio in a wireless communication system
First Claim
1. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver, comprising:
- a signal to interference ratio estimator for despreading signals, spread by the unique code of the receiver from the at least one receiver, using the unique code, measuring a multipath profile represented a delay time and signal strength of downlink signal transmitted through the multipath between the transmitter and the receiver from the despreading signals, transforming a multipath profile according to the FFT and acquiring a channel transfer function, estimating a distance between the transmitter and the receiver according to the delay time and estimating interference power between the transmitter and the receiver according to the distance, and estimating a signal to interference ratio of the subchannels of the receiver using a ratio of a the signal FFT processed and the estimated interference power; and
an adaptive transmitter for transmitting data to the at least one receiver based on the estimated signal to interference ratio.
1 Assignment
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Accused Products
Abstract
A transmission and reception apparatus and method for use in a wireless communication system, and an apparatus and method for adaptively transmit and receive a signal according to channel state in a wireless communication system. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver includes a signal to interference ratio estimator for estimating a signal to interference ratio of the channel using a signal transmitted from the at least one receiver; and an adaptive transmitter for transmitting data to the at least one receiver on a basis of the estimated signal to interference ratio.
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Citations
9 Claims
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1. An apparatus for adaptively performing transmission according to a state of a channel transmitted from a transmitter to at least one receiver, comprising:
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a signal to interference ratio estimator for despreading signals, spread by the unique code of the receiver from the at least one receiver, using the unique code, measuring a multipath profile represented a delay time and signal strength of downlink signal transmitted through the multipath between the transmitter and the receiver from the despreading signals, transforming a multipath profile according to the FFT and acquiring a channel transfer function, estimating a distance between the transmitter and the receiver according to the delay time and estimating interference power between the transmitter and the receiver according to the distance, and estimating a signal to interference ratio of the subchannels of the receiver using a ratio of a the signal FFT processed and the estimated interference power; and an adaptive transmitter for transmitting data to the at least one receiver based on the estimated signal to interference ratio. - View Dependent Claims (2, 3)
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4. An apparatus for adaptively performing transmission and reception according to a state of a channel transmitted from a transmitter to a receiver, comprising:
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an adaptive transmitter for measuring a multipath profile represented a delay time and signal strength of downlink signal transmitted through the multipath between the transmitter and the receiver using a pilot symbol spread with a unique code from the receiver, transforming a multipath profile according to the FFT and acquiring a channel transfer function, estimating a distance between the transmitter and the receiver according to the delay time and estimating interference power between the transmitter and the receiver according to the distance, and estimating a signal to interference ratio of the subchannels of the receiver using a ratio of a the signal FFT processed and the estimated interference power and adaptively performing data transmission according to the signal to interference ratio; and an adaptive receiver for transmitting a pilot symbol spread with a unique pseudo noise code to the adaptive transmitter, calculating a channel estimate of a signal transmitted from the adaptive transmitter, and adaptively receiving the transmitted signal using the calculated channel estimate. - View Dependent Claims (5, 6, 7)
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8. A method for adaptively performing transmission according to state of a channel transmitted from a transmitter to a receiver, comprising the steps of:
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transmitting a pilot symbol spread with a unique pseudo noise code from the receiver to the transmitter; receiving the pilot symbol spread with the unique pseudo noise code; measuring a multipath profile represented a delay time and signal strength of downlink signal transmitted through the multipath between the transmitter and the receiver from the despreading pilot symbol; transforming a multipath profile according to fast Fourier transform (FFT) and acquiring a channel transfer function; estimating a distance between the transmitter and the receiver according to the delay time and estimating interference power between the transmitter and the receiver according to the distance; calculating a signal power to interference power ratio using a ratio of a signal output from an FFT processor and a signal output from an interference estimator in the transmitter; and adaptively transmitting a signal from the transmitter to the receiver according to the estimated signal to interference ratio. - View Dependent Claims (9)
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Specification