[특허]Scattered pilot pattern and channel estimation method for MIMO-OFDM systems

[미국특허] Scattered pilot pattern and channel estimation method for MIMO-OFDM systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-027/26 H04L-005/00 H04W-052/42 H04B-007/04 H04B-007/06 H04L-001/06 H04L-025/02
출원번호	US-0832571 (2015-08-21)
등록번호	US-9503300 (2016-11-22)
발명자 / 주소	Ma, Jianglei Jia, Ming Zhu, Peiying Tong, Wen
출원인 / 주소	BlackBerry Limited
대리인 / 주소	Fish & Richardson P.C.
인용정보	피인용 횟수 : 0 인용 특허 : 50

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 (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.

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1. A method, comprising: for a first transmitting antenna, sparsely distributing pilot symbols in a respective first pattern in time-frequency into an Orthogonal Frequency Division Multiplexing (OFDM) frame, each pilot symbol location of the first pattern in time-frequency corresponding to a null symbol location in time-frequency for a second transmitting antenna;for a third transmitting antenna, sparsely distributing pilot symbols in a respective second pattern in time-frequency into the OFDM frame, each pilot symbol location of the second pattern in time-frequency corresponding to a null symbol location in time-frequency for a fourth transmitting antenna, wherein a pilot density for the first pattern is higher than a pilot density for the second pattern; andtransmitting the sparsely distributed pilot symbols. 2. The method of claim 1, wherein the OFDM frame includes a preamble. 3. The method of claim 1, wherein the OFDM frames includes a time domain and a frequency domain. 4. The method of claim 1, wherein at least one pattern is offset from a pilot pattern of an adjacent base station. 5. The method of claim 1, further comprising transmitting the pilot symbols at a higher power level than data symbols. 6. An Orthogonal Frequency Division Multiplexing (OFDM) base station of a wireless network, comprising: at least two transmitting antennas;one or more processors configured to: for a first transmitting antenna, sparsely distribute pilot symbols in a respective first pattern in time-frequency into an Orthogonal Frequency Division Multiplexing (OFDM) frame, each pilot symbol location of the first pattern in time-frequency corresponding to a null symbol location in time-frequency for a second transmitting antennafor a third transmitting antenna, sparsely distribute pilot symbols in a respective second pattern in time-frequency into the OFDM frame, each pilot symbol location of the second pattern in time-frequency corresponding to a null symbol location in time-frequency for a fourth transmitting antenna, wherein a pilot density for the first pattern is higher than a pilot density for the second pattern; anda transmitter configured to transmit the sparsely distributed pilot symbols. 7. The OFDM base station of claim 6, wherein the OFDM frame includes a preamble. 8. The OFDM base station of claim 6, wherein the OFDM frames includes a time domain and a frequency domain. 9. The OFDM base station of claim 6, wherein at least one pattern is offset from a pilot pattern of an adjacent base station. 10. The OFDM base station of claim 6, further configured to transmit the pilot symbols at a higher power level than data symbols. 11. A non-transitory computer readable medium storing instructions to cause a processor to perform operations comprising: for a first transmitting antenna, sparsely distributing pilot symbols in a respective first pattern in time-frequency into an Orthogonal Frequency Division Multiplexing (OFDM) frame, each pilot symbol location of the first pattern in time-frequency corresponding to a null symbol location in time-frequency for a second transmitting antenna;for a third transmitting antenna, sparsely distributing pilot symbols in a respective second pattern in time-frequency into the OFDM frame, each pilot symbol location of the second pattern in time-frequency corresponding to a null symbol location in time-frequency for a fourth transmitting antenna, wherein a pilot density for the first pattern is higher than a pilot density for the second pattern; andtransmitting the sparsely distributed pilot symbols. 12. The non-transitory computer readable medium of claim 11, wherein the OFDM frame includes a preamble. 13. The non-transitory computer readable medium of claim 11, wherein the OFDM frames includes a time domain and a frequency domain. 14. The non-transitory computer readable medium of claim 11, wherein at least one pattern is offset from a pilot pattern of an adjacent base station. 15. The non-transitory computer readable medium of claim 11, further comprising transmitting the pilot symbols at a higher power level than data symbols.

이 특허에 인용된 특허 (50) 인용/피인용 타임라인 분석

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[미국특허] Scattered pilot pattern and channel estimation method for MIMO-OFDM systems 원문보기

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