OFDM channel identification
AssigneeCisco Technology, Inc.
InventorsVincent K. Jones, IV, David Pignatelli
Life of this patent
Estimating the term…
Abstract
A system and method for characterizing a channel used by a digital communication system. In an OFDM system, the number of training symbols used to characterize a channel may be decreased by taking advantage of knowledge of certain channel components, e.g., transmitter and/or receiver digital filters. The number of training symbols used may be less than v, the duration of the impulse response of the overall channel.
Claims40
In a digital communication system a method for characterizing a channel having known and unknown components, the method comprising:
- receiving a time domain series of symbols via said channel;
- converting said time domain series of symbols into a series of frequency domain symbols including exactly μ training symbols wherein μ is less than a duration of an impulse response of said channel in symbol periods;
- and
- processing said μ training symbols to characterize said unknown components of said channel, based on knowledge of said known components of said channel.
A digital communication system that characterizes a channel having known and unknown components, said digital communication system comprising:
- a receiver that receives a time domain series of symbols via said channel;
- a frequency domain converter that converts said time domain series of symbols into a series of frequency domain symbols including exactly μ training symbols wherein μ is less than a duration of an impulse response of said channel in symbol periods;
- and
- a channel estimation processor that processes said training symbols to characterize said unknown components of said channel.
A digital communication system comprising:
- a transmitter that transmits OFDM symbols in successive bursts wherein at least one burst includes exactly μ training symbols wherein μ is less than a duration of an impulse response of said channel in symbol periods;
- a receiver coupled to said transmitter via a channel comprising both known and unknown components;
- and
- said receiver comprising a channel estimation processor that receives said training symbols and processes said training symbols to characterize said unknown components of said channel based on said known components.
In a digital communication system, apparatus for characterizing a channel having known and unknown components, said apparatus comprising:
- means for receiving a time domain series of symbols via said channel;
- means for converting said time domain series of symbols into a series of frequency domain symbols including exactly μ training symbols wherein μ is less than a duration of an impulse response of said channel in symbol periods;
- and
- means for processing said μ training symbols to characterize said unknown components of said channel, based on knowledge of said known components of said channel.
Dependencies are inferred from the claim text.