US 7,848,356 B2 · Frequency domain channel estimation in a single carrier frequency division multiple access system

Abstract

A channel estimator for use in a receiver node receiving signals from a plurality of user terminals wherein each user terminal is allotted a respective set of transmission subcarriers and respective test signal sequences for transmission over the channel to be estimated. The channel estimator has stored therein information as to the respective sets of transmission subcarriers allotted to the user terminals for transmission as well as the discrete spectra of the respective test signal sequences allotted to the user terminals. Upon receiving from a plurality of user terminals signals including the respective test signal sequences transmitted over the channel by using the respective sets of transmission subcarriers allotted thereto, the estimator generates the discrete spectrum of the combined test signal received and performs channel estimation as a function of the discrete spectrum of the combined test signal and the discrete spectra of the test signal sequences allotted to the user terminals. A frequency domain channel estimation is performed for a single carrier frequency division multiple access system.

Claims26

Dependent claims

A method of channel estimation in a transmission system comprising a plurality of user terminals transmitting signals to a receiver node wherein each said user terminal is allotted a respective set of transmission subcarriers for transmission over a channel, comprising the steps of:

allotting to said user terminals, respective test signal sequences for transmission over said channel;
storing at said receiver node, information as to the respective sets of transmission subcarriers allotted to said user terminals for transmission over said channel as well as discrete spectra of said respective test signal sequences allotted to said user terminals;
including said respective test signal sequences in said signals transmitted over said channel by said plurality of user terminals by using said respective sets of transmission subcarriers allotted thereto, whereby a combined test signal is produced at said receiving node;
generating at said receiving node, a discrete spectrum of said combined test signal;
and
obtaining channel estimation as a function of said discrete spectrum of said combined test signal and said discrete spectra of said respective test signal sequences allotted to said user terminals.

3 more elements

A channel estimator for channel estimation in a receiver node receiving signals from a plurality of user terminals, wherein each said user terminal is allotted a respective set of transmission subcarriers and respective test signal sequences for transmission over a channel, wherein said channel estimator comprises:

at least one memory having stored therein information as to respective sets of transmission subcarriers allotted to said user terminals for transmission over said channel as well as discrete spectra of said respective test signal sequences allotted to said user terminals;
a spectrum generator for generating a discrete spectrum of a combined test signal produced at said receiving node as a result of receiving from a plurality of said user terminals, signals comprising said respective test signal sequences transmitted over said channel by using said respective sets of transmission subcarriers allotted thereto;
and
processing elements for obtaining channel estimation as a function of said discrete spectrum of said combined test signal and said discrete spectra of said respective test signal sequences allotted to said user terminals.

1 more element

Dependencies are inferred from the claim text.

Frequency domain channel estimation in a single carrier frequency division multiple access system

Life of this patent

Frequency domain channel estimation in a single carrier frequency division multiple access system

Life of this patent

Abstract

Claims26