IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
US-0617175
(2012-09-14)
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| 등록번호 |
US-8891481
(2014-11-18)
|
|
발명자
/ 주소 |
- Ma, Jianglei
- Jia, Ming
- Zhu, Peiying
- Tong, Wen
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
6 인용 특허 :
35 |
초록
▼
Methods and apparatus are provided for inserting data symbols and pilot symbols in an OFDM (orthogonal frequency division multiplexing) transmission resource utilizing frequency hopping patterns for the data symbols and/or the pilot symbols. Data symbols and pilot symbols are allocated for down link
Methods and apparatus are provided for inserting data symbols and pilot symbols in an OFDM (orthogonal frequency division multiplexing) transmission resource utilizing frequency hopping patterns for the data symbols and/or the pilot symbols. Data symbols and pilot symbols are allocated for down link (base station to mobile station) and up link (mobile station to bases station) transmission resources in a two-dimensional time-frequency pattern. For each antenna of a MIMO-OFDM (multiple input multiple output OFDM) communication system, pilot symbols are inserted in a scattered pattern in time-frequency and data symbols are inserted in an identical frequency-hopping pattern in time-frequency as that of other antennas.
대표청구항
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1. A method of inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames at an OFDM transmitter having at least two pairs of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising: for each antenna, sparsely distributing p
1. A method of inserting data symbols into Orthogonal Frequency Division Multiplexing (OFDM) frames at an OFDM transmitter having at least two pairs of transmitting antennas, the OFDM frames having a time domain and a frequency domain, the method comprising: for each antenna, sparsely distributing pilot symbols in a respective pattern in time-frequency, the patterns being identical for each pair of antennas, the pattern for a first antenna of each of the two pairs of antennas being offset in frequency with respect to the pattern for a second antenna of that pair of antennas, and a pilot density for a first pair of the two pairs of transmitting antennas is higher than a pilot density for a second pair of the two pairs of transmitting antennas. 2. The method of claim 1, wherein at least one pattern is offset from a pilot pattern of an adjacent base station. 3. The method of claim 1, further comprising mapping each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol and a selected data sub-carrier. 4. The method of claim 3, further comprising, for each data symbol, permuting the selected data sub-carriers according to a frequency-hopping pattern that is identical for each pair of transmitting. 5. The method of claim 1, further comprising for the first antenna of each pair of antennas, inserting pilot symbols in a first scattered pattern in time-frequency and inserting null symbols in a second scattered pattern in time-frequency; and for a second antenna of each pair of antennas, inserting pilot symbols in the second scattered pattern in time-frequency and inserting null symbols in the first scattered pattern in time-frequency. 6. The method of claim 1, further comprising transmitting the pilot symbols at a higher power level than the data symbols. 7. An Orthogonal Frequency Division Multiplexing (OFDM) base station of a wireless network, the OFDM base station having at least two pairs of transmitting antennas configured to transmit data symbols in OFDM frames, the OFDM frames having a time domain and a frequency domain, the base station configured to: for each antenna, sparsely distribute pilot symbols in a respective pattern in time-frequency, the patterns being identical for each pair of antennas, the pattern for a first antenna of each of the two pairs of antennas being in frequency with respect to the pattern for a second antenna of that pair of antennas, and a pilot density for a first pair of the two pairs of transmitting antennas is higher than a pilot density for a second pair of the two pairs of transmitting antennas. 8. The OFDM base station of claim 7, wherein at least one pattern is offset from a pilot pattern of an adjacent base station. 9. The OFDM base station of claim 7, further configured to map each data symbol to at least one respective combination of a selected antenna, a selected OFDM symbol, and a selected data sub-carrier. 10. The OFDM base station of claim 9, further configured to permute, for each data symbol, the selected data sub-carriers according to a frequency-hopping pattern that is identical for each pair of transmitting. 11. The OFDM base station of claim 7, further configured to insert, for the first antenna of each pair of antennas, pilot symbols in a first scattered pattern in time-frequency and inserting null symbols in a second scattered pattern in time-frequency; and for a second antenna of each pair of antennas, inserting pilot symbols in the second scattered pattern in time-frequency and inserting null symbols in the first scattered pattern in time-frequency. 12. The OFDM base station of claim 7, further configured to transmit the pilot symbols at a higher power level than the data symbols.
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