Source: http://www.google.ca/patents/US9154281
Timestamp: 2017-12-17 21:26:48
Document Index: 757044353

Matched Legal Cases: ['Application No. 14164460', 'Application No. 02801256', 'Application No. 10182868', 'Application No. 10182868', 'Application No. 02801256', 'Application No. 10182868', 'Application No. 14164460', 'art 16', 'art 16', 'art 16', 'Application No. 200810001919', 'Application No. 200810001919', 'Application No. 200810001919', 'Application No. 200810001919', 'Application No. 201080039485', 'Application No. 2012', 'Application No. 2012103239', 'Application No. 02801256', 'Application No. 02801256']

Patent US9154281 - Scattered pilot pattern and channel estimation method for MIMO-OFDM systems - Google Patents
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...http://www.google.ca/patents/US9154281?utm_source=gb-gplus-sharePatent US9154281 - Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
Publication number US9154281 B2
Application number US 14/520,080
Also published as CN1605172A, CN100385847C, CN101188597A, CN101188597B, EP1442549A1, EP2320594A2, EP2320594A3, EP2320594B1, EP2755349A1, EP2755349B1, EP3065332A1, US7248559, US7545734, US7778337, US7949061, US8254246, US8325836, US8406118, US8462872, US8774223, US8891481, US8964523, US8971169, US9313065, US9503300, US9780984, US20030072254, US20070053282, US20070253324, US20090225891, US20100271930, US20110216808, US20120307930, US20130010808, US20130010887, US20130016693, US20130223553, US20140314183, US20150085820, US20150180630, US20160036611, US20160226691, WO2003034644A1
Publication number 14520080, 520080, US 9154281 B2, US 9154281B2, US-B2-9154281, US9154281 B2, US9154281B2
Patent Citations (101), Non-Patent Citations (80), Classifications (21), Legal Events (2)
US 9154281 B2
1. A method of inserting pilot 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, 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; and
for each antenna, transmitting the sparsely distributed pilot symbols.
5. 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 pilot 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, 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; and
for each antenna, transmit the sparsely distributed pilot symbols.
9. A non-transitory computer readable medium for inserting pilot 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 computer readable medium storing instructions to cause a processor to perform operations comprising:
H new ( n + 1 , k ) = 1 4 ( H ( n , k ) + H ( n + 2 , k ) + H ( n + 1 , k - 1 ) + H ( n + 1 , k + 1 ) ) where ( k = 2 , … , N pilot - 1 ) H new ( n + 1 , 1 ) = 1 4 ( H ( n , 1 ) + H ( n + 2 , 1 ) + 2 H ( n + 1 , 2 ) ) H new ( n + 1 , N pilot ) = 1 4 ( H ( n , N pilot ) + H ( n + 2 , N pilot ) + 2 H ( n , N pilot - 1 ) )
H interp ( ( j - 1 ) · D f 2 + i ) = ∑ n = - 1 2 q n ( μ ( i ) ) · H sm ′ ( j + n ) where j = 2 , … , N pilot - 2.
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International Classification H04B7/04, H04B7/06, H04L25/02, H04L1/06, H04L5/02, H04L27/26, H04L5/00
Cooperative Classification H04W52/42, H04L27/2613, H04L5/0048, H04L25/0244, H04B7/0413, H04L27/2602, H04L25/0234, H04L1/0618, H04L5/0023, H04L27/2627, H04L25/0204, H04L25/022, H04B7/04, H04B7/0684
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