Pilot transmission and channel estimation for a communication system utilizing frequency division multiplexing

A method implemented in an apparatus for generating a pilot in a communication system, the method comprising:

• forming, via the apparatus, a first sequence of pilot symbols based on a polyphase sequence;
• obtaining, via the apparatus, a second sequence of pilot symbols based on the first sequence of pilot symbols;
• and
• generating, via the apparatus, a sequence of output symbols based on the second sequence of pilot symbols, the sequence of output symbols comprising a cyclic prefix and suitable for transmission via a communication channel.

An apparatus comprising:

• means for forming a first sequence of pilot symbols based on a polyphase sequence;
• means for obtaining a second sequence of pilot symbols based on the first sequence of pilot symbols;
• and
• means for generating a sequence of output symbols based on the second sequence of pilot symbols, the sequence of output symbols comprising a cyclic prefix and suitable for transmission via a communication channel.

An apparatus comprising:

• means for forming a sequence of pilot symbols;
• means for forming a sequence of data symbols;
• means for time division multiplexing the sequence of data symbols and the sequence of pilot symbols;
• and
• means for generating at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the time division multiplexed data symbols and pilot symbols, each of the at least one SC-FDMA symbol comprising a cyclic prefix.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to form a first sequence of pilot symbols based on a polyphase sequence,
• code for causing the at least one processor to obtain a second sequence of pilot symbols based on the first sequence of pilot symbols, and
• code for causing the at least one processor to generate a sequence of output symbols based on the second sequence of pilot symbols, the sequence of output symbols comprising a cyclic prefix and suitable for transmission via a communication channel.

A method implemented in an apparatus for generating a pilot in a communication system, the method comprising:

• forming, via the apparatus, a first sequence of pilot symbols based on a polyphase sequence;
• transforming, via the apparatus, the first sequence of pilot symbols to frequency domain to obtain a second sequence of frequency-domain symbols;
• forming, via the apparatus, a third sequence of symbols with the second sequence of frequency-domain symbols mapped onto a group of subcarriers used for pilot transmission;
• and
• transforming, via the apparatus, the third sequence of symbols to time domain to obtain a fourth sequence of output symbols for transmission via a communication channel.

An apparatus comprising:

• means for forming a first sequence of pilot symbols based on a polyphase sequence;
• means for transforming the first sequence of pilot symbols to frequency domain to obtain a second sequence of frequency-domain symbols;
• means for forming a third sequence of symbols with the second sequence of frequency-domain symbols mapped onto a group of subcarriers used for pilot transmission;
• and
• means for transforming the third sequence of symbols to time domain to obtain a fourth sequence of output symbols for transmission via a communication channel.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to form a first sequence of pilot symbols based on a polyphase sequence,
• code for causing the at least one processor to transform the first sequence of pilot symbols to frequency domain to obtain a second sequence of frequency-domain symbols,
• code for causing the at least one processor to form a third sequence of symbols with the second sequence of frequency-domain symbols mapped onto a group of subcarriers used for pilot transmission, and
• code for causing the at least one processor to transform the third sequence of symbols to time domain to obtain a fourth sequence of output symbols for transmission via a communication channel.

An apparatus comprising:

• means for forming a sequence of pilot symbols;
• means for forming a sequence of data symbols;
• means for generating a pilot based on the sequence of pilot symbols;
• means for generating at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the sequence of data symbols;
• and
• means for time division multiplexing the pilot and the at least one SC-FDMA symbol, wherein the pilot has a wider bandwidth than the sequence of data symbols, and wherein each of the at least one SC-FDMA symbol comprises a cyclic prefix.

A method implemented in an apparatus, the method comprising:

• forming, via the apparatus, a sequence of pilot symbols;
• forming, via the apparatus, a sequence of data symbols;
• generating, via the apparatus, a pilot based on the sequence of pilot symbols;
• generating, via the apparatus, at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the sequence of data symbols;
• and
• time division multiplexing, via the apparatus, the pilot and the at least one SC-FDMA symbol, wherein the pilot has a wider bandwidth than the sequence of data symbols, and wherein each of the at least one SC-FDMA symbol comprises a cyclic prefix.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to form a sequence of pilot symbols,
• code for causing the at least one processor to form a sequence of data symbols,
• code for causing the at least one processor to generate a pilot based on the sequence of pilot symbols,
• code for causing the at least one processor to generate at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the sequence of data symbols, and
• code for causing the at least one processor to time division multiplex the pilot and the at least one SC-FDMA symbol, wherein the pilot has a wider bandwidth than the sequence of data symbols, and wherein each of the at least one SC-FDMA symbol comprises a cyclic prefix.

A method implemented in an apparatus, the method comprising:

• forming, via the apparatus, a sequence of pilot symbols;
• forming, via the apparatus, a sequence of data symbols;
• time division multiplexing, via the apparatus, the sequence of data symbols and the sequence of pilot symbols;
• and
• generating, via the apparatus, at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the time division multiplexed data symbols and pilot symbols, wherein each of the at least one SC-FDMA symbol comprises a cyclic prefix.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to form a sequence of pilot symbols,
• code for causing the at least one processor to form a sequence of data symbols,
• code for causing the at least one processor to time division multiplex the sequence of data symbols and the sequence of pilot symbols, and
• code for causing the at least one processor to generate at least one single-carrier frequency division multiple access (SC-FDMA) symbol based on the time division multiplexed data symbols and pilot symbols, wherein each of the at least one SC-FDMA symbol comprises a cyclic prefix.