Channel estimation for an OFDM communicaiton system with inactive subbands

An apparatus for estimating a frequency response of a wireless channel in a wireless communication system, comprising:

• a processor;
• and
• a memory coupled to a processor, the memory storing instructions that, when executed by the processor, cause the processor to:
• obtain an initial frequency response estimate for a set of P subbands, where P is an integer greater than one;
• derive a time-domain channel impulse response estimate with P taps for the wireless channel based on the initial frequency response estimate;
• set selected ones of the P taps of the channel impulse response estimate to zero;
• and
• derive a final frequency response estimate for the wireless channel based on the channel impulse response estimate with selected ones of the P taps set to zero.

A system of estimating a frequency response of a wireless channel in a wireless communication system, comprising:

• means for obtaining an initial frequency response estimate for a set of P subbands, where P is an integer greater than one;
• means for deriving a time-domain channel impulse response estimate with P taps for the wireless channel based on the initial frequency response estimate;
• means for setting selected ones of the P taps of the channel impulse response estimate to zero;
• and
• means for deriving a final frequency response estimate for the wireless channel based on the channel impulse response estimate with selected ones of the P taps set to zero.

A non-transitory processor readable media for storing instructions operable to:

• obtain an initial frequency response estimate for a set of P subbands, where P is an integer greater than one;
• derive a time-domain channel impulse response estimate with P taps for the wireless channel based on the initial frequency response estimate;
• set selected ones of the P taps of the channel impulse response estimate to zero;
• and
• derive a final frequency response estimate for the wireless channel based on the channel impulse response estimate with selected ones of the P taps set to zero.