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US 7,646,833 B1Granted
Channel equalization in receivers
AssigneeMarvell International Ltd.
InventorsRunsheng He, Jing Fang
Life of this patent
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Abstract
Systems and techniques relating to channel equalization in received communications signals are described. In one aspect, a communications signal of a channel is obtained and channel effects are removed from the communications signal by generating one or more time-varying channel response estimates.
Claims32
A method comprising:
- obtaining a communications signal of a channel;
- and
- removing, by a receiver device, in the frequency domain, channel effects from the communications signal, the removing comprising generating, in the time domain, one or more time-varying channel response estimates based on an initial decision signal represented in the time domain after being generated, by the receiver device, for the communications signal in the frequency domain.
A method comprising:
- receiving a communications signal comprising one or more pilot signals on one or more subcarrier signals;
- estimating a time-invariant channel response based at least in part on the one or more pilot signals;
- generating a first estimated frequency-domain source signal based at least in part on the time-invariant channel response;
- generating a first estimated time-domain source signal based at least in part on the first estimated frequency-domain source signal;
- estimating a time-varying time-domain channel response using a least-mean-squared technique;
- generating a time-varying frequency-domain channel response based at least in part on the time-varying time-domain channel response;
- and
- generating a second estimated frequency-domain source signal based at least in part on the time-varying frequency domain channel response;
- wherein estimating the time-invariant channel response, generating the first estimated frequency-domain source signal, generating the first estimated time-domain source signal, estimating the time-varying time-domain channel response, generating the time-varying frequency-domain channel response, and generating the second estimated frequency-domain source signal are performed by a receiver device.
6 more elements
A storage device encoded with a program operable to cause one or more machines to perform operations comprising:
- obtaining a communications signal of a channel;
- and
- removing, in the frequency domain, channel effects from the communications signal, the removing comprising generating, in the time domain, one or more time-varying channel response estimates based on an initial decision signal represented in the time domain after being generated, by a receiver, for the communications signal in the frequency domain.
An apparatus comprising:
- an input configured to obtain a communications signal of a channel;
- and
- a channel equalizer configured to remove, in the frequency domain, channel effects from the communications signal using one or more time-varying time-domain channel response estimates generated based on an initial decision signal represented in the time domain after being generated for the communications signal in the frequency domain.
A storage device encoded with a program operable to cause one or more machines to perform operations comprising:
- receiving a communications signal comprising one or more pilot signals on one or more subcarrier signals;
- estimating a time-invariant channel response based at least in part on the one or more pilot signals;
- generating a first estimated frequency-domain source signal based at least in part on the time-invariant channel response;
- generating a first estimated time-domain source signal based at least in part on the first estimated frequency-domain source signal;
- estimating a time-varying time-domain channel response using a least-mean-squared technique;
- generating a time-varying frequency-domain channel response based at least in part on the time-varying time-domain channel response;
- and
- generating a second estimated frequency-domain source signal based at least in part on the time-varying frequency domain channel response.
5 more elements
An apparatus comprising:
- an input configured to receive a communications signal comprising one or more pilot signals on one or more subcarrier signals;
- and
- one or more equalization circuits configured to effect operations comprising:
- estimating a time-invariant channel response based at least in part on the one or more pilot signals;
- generating a first estimated frequency-domain source signal based at least in part on the time-invariant channel response;
- generating a first estimated time-domain source signal based at least in part on the first estimated frequency-domain source signal;
- estimating a time-varying time-domain channel response using a least-mean-squared technique;
- generating a time-varying frequency-domain channel response based at least in part on the time-varying time-domain channel response;
- and
- generating a second estimated frequency-domain source signal based at least in part on the time-varying frequency domain channel response.
7 more elements
Dependencies are inferred from the claim text.