Channel estimation unit, and CDMA receiver and CDMA transceiver with channel estimation unit

A CDMA transceiver having a transmitting processor and a receiving processor, said transmitting processor generating a spread data symbol sequence by modulating a data sequence, and transmitting the spread data symbol sequence with a spread pilot symbol sequence which is spread in parallel with the data symbol sequence, and said receiving processor receiving the spread data symbol sequence and the spread pilot symbol sequence, and generating the data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, wherein

• said transmitting processor comprises:
• means for generating the data symbol sequence by modulating the data sequence;
• means for generating the spread data symbol sequence by spreading the data symbol sequence;
• means for generating the spread pilot symbol sequence by spreading the pilot symbol sequence;
• and
• means for transmitting the spread data symbol sequence and the spread pilot symbol sequence, and wherein
• said receiving processor comprises:
• means for receiving the spread data symbol sequence and the spread pilot symbol sequence;
• means for generating the data symbol sequence by despreading the spread data symbol sequence;
• means for generating the pilot symbol sequence by despreading the spread pilot symbol sequence;
• means for generating from the pilot symbol sequence a plurality of pilot blocks;
• means for obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• means for compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• means for generating the data sequence by demodulating the data symbol sequence compensated for.

A CDMA transmitting and receiving method which generates a spread data symbol sequence by modulating a data sequence, transmits the spread data symbol sequence with a pilot symbol sequence which is spread in parallel with the data symbol sequence, receives the spread data symbol sequence and the spread pilot symbol sequence, and generates the data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, wherein

• a transmitting side comprises the steps of:
• generating the data symbol sequence by modulating the data sequence;
• generating the spread data symbol sequence by spreading the data symbol sequence;
• generating the spread pilot symbol sequence by spreading the pilot symbol sequence;
• and
• transmitting the spread data symbol sequence and the spread pilot symbol sequence, and wherein
• a receiving side comprises the steps of:
• receiving the spread data symbol sequence and the spread pilot symbol sequence;
• generating the data symbol sequence by despreading the spread data symbol sequence;
• generating the pilot symbol sequence by despreading the spread pilot symbol sequence;
• generating from the pilot symbol sequence a plurality of pilot blocks;
• obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols contained in the pilot blocks;
• compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• generating the data sequence by demodulating the data symbol sequence compensated for.

A CDMA receiver which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiver comprising:

• means for receiving the spread data symbol sequence and the spread pilot symbol sequence;
• means for generating a data symbol sequence by despreading the spread data symbol sequence;
• means for generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• means for generating from the pilot symbol sequence a plurality of pilot blocks;
• means for obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• means for compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• means for generating the data sequence by demodulating the data symbol sequence compensated for, wherein the power of the data symbol sequence and that of the pilot symbol sequence are controlled on a slot by slot basis, and wherein the plurality of pilot blocks each consist of pilot symbols belonging to at least two different slots.

A CDMA receiver which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiver comprising:

• means for receiving the spread data symbol sequence and the spread pilot symbol sequence;
• means for generating a data symbol sequence by despreading the spread data symbol sequence;
• means for generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• means for generating from the pilot symbol sequence a plurality of pilot blocks;
• means for obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• means for compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• means for generating the data sequence by demodulating the data symbol sequence compensated for, wherein when obtaining the channel estimate of an nth data symbol in the data symbol sequence, where n is an integer, the plurality of the pilot blocks each consist of pilot symbols from (n−K+1)th pilot symbol to (n+K)th pilot symbol in the pilot symbol sequence, where K is a natural number.

A CDMA receiver which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiver comprising:

• means for receiving the spread data symbol sequence and the spread pilot symbol sequence;
• means for generating a data symbol sequence by despreading the spread data symbol sequence;
• means for generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• means for generating from the pilot symbol sequence a plurality of pilot blocks;
• means for obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• means for compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• means for generating the data sequence by demodulating the data symbol sequence compensated for, wherein when obtaining the channel estimate of an nth data symbol in the date symbol sequence, where n is an integer, the pilot blocks consisting of pilot symbols closer to the nth pilot symbol have a greater weight.

A CDMA receiving method which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiving method comprising the steps of:

• receiving the spread data symbol sequence and the spread pilot symbol sequence;
• generating a data symbol sequence by despreading the spread data symbol sequence;
• generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• generating from the pilot symbol sequence a plurality of pilot blocks;
• obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• generating the data sequence by demodulating the data symbol sequence compensated for, wherein the spread data symbol sequence has been spread using a first spreading code, the spread pilot symbol sequence has been spread using a second spreading code, said step of generating the data symbol sequence despreads the spread data symbol sequence which has been spread using the first spreading code, and said step of generating the pilot symbol sequence despreads the spread pilot symbol sequence which has been spread using the second spreading code, and wherein the first spreading code and the second spreading code are orthogonal to each other.

A CDMA receiving method which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiving method comprising the steps of:

• receiving the spread data symbol sequence and the spread pilot symbol sequence;
• generating a data symbol sequence by despreading the spread data symbol sequence;
• generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• generating from the pilot symbol sequence a plurality of pilot blocks;
• obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• generating the data sequence by demodulating the data symbol sequence compensated for, wherein the power of the data symbol sequence and that of the pilot symbol sequence are controlled on a slot by slot basis, and wherein the plurality of pilot blocks each consist of pilot symbols belonging to at least two different slots.

A CDMA receiving method which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiving method comprising the steps of:

• receiving the spread data symbol sequence and the spread pilot symbol sequence;
• generating a data symbol sequence by despreading the spread data symbol sequence;
• generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• generating from the pilot symbol sequence a plurality of pilot blocks;
• obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• generating the data sequence by demodulating the data symbol sequence compensated for, wherein when obtaining the channel estimate of an nth data symbol in the data symbol sequence, where n is an integer, the plurality of the pilot blocks each consist of pilot symbols from (n−K+1)th pilot symbol to (n+K)th pilot symbol in the pilot symbol sequence, where K is a natural number.

A CDMA receiving method which receives a data symbol sequence that is spread, and a pilot symbol sequence that is spread and parallel to the data symbol sequence, and which generates a data sequence by demodulating the spread data symbol sequence by using the spread pilot symbol sequence, said CDMA receiving method comprising the steps of:

• receiving the spread data symbol sequence and the spread pilot symbol sequence;
• generating a data symbol sequence by despreading the spread data symbol sequence;
• generating a pilot symbol sequence by despreading the spread pilot symbol sequence;
• generating from the pilot symbol sequence a plurality of pilot blocks;
• obtaining channel estimates of the data symbols by calculating a weighted sum of averages of the pilot symbols in the individual pilot blocks;
• compensating for channel fluctuations in the data symbol sequence by using the channel estimates of the data symbols;
• and
• generating the data sequence by demodulating the data symbol sequence compensated for, wherein when obtaining the channel estimate of an nth data symbol in the data symbol sequence, where n is an integer, the pilot blocks consisting of pilot symbols closer to the nth pilot symbol have a greater weight.