Channel estimating apparatus and channel estimating method

• US 20030016646A1
• Filed: 03/12/2002
• Published: 01/23/2003
• Est. Priority Date: 07/14/2000
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Miya, Kazuyuki
• Application Number:
  US10/070,737
• Publication Number:
  US 20030016646A1
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
• CPC Class Codes: H04L 2027/0028 at passband only
• CPC Class Codes: H04L 2027/0087 Out-of-band signals, (e.g. pilots)
• CPC Class Codes: H04L 25/0224 using sounding signals

Abstract

Frequency offset obtained by a frequency offset detecting circuit 2051 is output to a per-slot phase rotation correcting circuit 207 and per-symbol phase rotation correcting circuits 209 and 210. A maximum Doppler frequency (fD) obtained by an fD detecting circuit 2052 is output to a weight factor calculating circuit 208. The per-symbol phase rotation correcting circuits 209 and 210 calculate a phase rotation correction value Δθsymbol of each symbol based on an amount of phase rotation of a frequency offset and outputs the value to multipliers 206 and 201. The per-slot phase rotation correcting circuit 207 calculates a phase rotation correction value Δθslot of each slot based on the amount of phase rotation of the frequency offset and outputs the value to a weighted adding circuit 204. In the weight factor calculating circuit 208, a weight factor (α) is calculated according to the detected fD value and is output to the weighted adding circuit 204.

Claims

1. A channel estimating apparatus comprising:

phase rotation detecting means for separately detecting a frequency offset component and a fading fluctuation component of a phase rotation from a known signal included in a received signal; and

channel estimating means for carrying out channel estimation using said frequency offset component and said fading fluctuation component of the phase rotation.

2. The channel estimating apparatus according to claim 1, further comprising a first phase rotation correcting means for carrying out a phase rotation correction of a slot unit using the frequency offset component of the phase rotation.

3. The channel estimating apparatus according to claim 1, further comprising a second phase rotation correcting means for carrying out a phase rotation correction of a symbol unit using the frequency offset component of the phase rotation.

4. The channel estimating apparatus according to claim 1, further comprising weight factor calculating means for calculating a weight factor which is used to carry out a weighting addition among the slots in a channel estimation using the fading fluctuation component of the phase rotation.

5. The channel estimating apparatus according to claim 4, said channel estimating apparatus calculates a channel estimation value of each symbol by multiplying the output after weighting addition by the phase rotation correction value of a symbol unit calculated by said second phase rotation correcting means when calculating channel estimation value of each symbol.

6. The channel estimating apparatus according to claim 4, said channel estimating apparatus carries out a processing on the output after weighting addition to adjust the channel estimation value to a slot median when calculating a channel estimation value as the average of slots.

7. A base station apparatus comprising a channel estimating apparatus, said channel estimating apparatus comprising:

phase rotation detecting means for separately detecting a frequency offset component and a fading fluctuation component of a phase rotation from a known signal included in a received signal; and

channel estimating means for carrying out channel estimation using said frequency offset component and said fading fluctuation component of the phase rotation.

8. A channel estimating method comprising:

a phase rotation detecting step of separately detecting a frequency offset component and a fading fluctuation component of a phase rotation from a known signal included in a received signal; and

carrying out channel estimation using said frequency offset component and said fading fluctuation component of the phase rotation.

9. The channel estimating method according to claim 8, further comprising:

a first phase rotation correction step of carrying out a phase rotation correction of a symbol unit using said frequency offset component of the phase rotation; and

a second phase rotation correction step of carrying out a phase rotation correction of a slot unit using said frequency offset component of the phase rotation.

10. The channel estimating method according to claim 8, further comprising a weight factor calculating step of calculating a weight factor which is used to carry out a weight addition among the slots in the received signal using the fading fluctuation component of the phase rotation.