Multi-mode frequency domain equalization with adaptation to varying channel conditions

An apparatus to receive a signal over a channel, comprising:

• a first channel estimator to estimate the channel based on PN sequences of the signal;
• first and second adaptive blind equalizers to concurrently equalize a frequency domain representation of the received signal;
• a selector to select weights of one of the first and second adaptive blind equalizers based on a condition of the channel;
• a linear adaptive equalizer to equalize the frequency domain representation of the received signal, including to apply the selected weights as initial linear adaptive equalizer weights and to adapt the initial linear adaptive equalizer weights based on equalization results of the linear adaptive equalizer;
• and
• a decision system to generate decisions regarding the symbols based in part on the equalization results of the linear adaptive equalizer.

A non-transitory computer readable medium encoded with a computer program, including instructions to cause a processor to:

• estimate a channel of a received signal based on PN sequences of the signal;
• equalize a frequency domain representation of the received signal with first and second adaptive blind equalization techniques concurrently with one another;
• select weights of one of the first and second adaptive blind equalization techniques based on a condition of the channel;
• equalize the frequency domain representation of the received signal with a an adaptive linear equalization technique, including to apply the selected weights as initial linear adaptive equalization weights and to adapt the initial linear adaptive equalization weights based on linear adaptive equalization results;
• and
• a decision system to generate decisions regarding the symbols based in part on the linear adaptive equalization results.

A system, comprising:

• a receiver system, including,
• a first channel estimator to estimate a channel of a received signal based on PN sequences of the signal,
• first and second adaptive blind equalizers to concurrently equalize a frequency domain representation of the received signal,
• a selector to select weights of one of the first and second adaptive blind equalizers based on a condition of the channel,
• a linear adaptive equalizer to equalize the frequency domain representation of the received signal, including to apply the selected weights as initial linear adaptive equalizer weights and to adapt the initial linear adaptive equalizer weights based on equalization results of the linear adaptive equalizer, and
• a decision system to generate decisions regarding the symbols based in part on the equalization results of the linear adaptive equalizer;
• a digital processor system to process the symbol decisions and output corresponding information to a user interface system;
• and
• a housing;
• wherein the receiver system and the digital processor system are positioned within the housing.