Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2007-07-24
2007-07-24
Pham, Chi (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C370S328000, C370S335000, C370S342000, C370S441000, C375S299000, C375S316000, C455S101000
Reexamination Certificate
active
10038883
ABSTRACT:
A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.
REFERENCES:
patent: 5867478 (1999-02-01), Baum et al.
patent: 6298035 (2001-10-01), Heiskala
patent: 6359938 (2002-03-01), Keevill et al.
patent: 6473393 (2002-10-01), Ariyavisitakul et al.
patent: 6654429 (2003-11-01), Li
patent: 2002/0003774 (2002-01-01), Wang et al.
patent: 2002/0034213 (2002-03-01), Wang et al.
patent: 2002/0080887 (2002-06-01), Jeong et al.
patent: 2002/0122383 (2002-09-01), Wu et al.
patent: 2002/0144294 (2002-10-01), Rabinowitz et al.
patent: 2002/0181390 (2002-12-01), Mody et al.
patent: 2003/0016621 (2003-01-01), Li
Fernández-Getino Garcia, MaJulia et al; Efficient Pilot Patterns for Channel Estimation in OFDM Systems Over HF Channels; pp. 2193-2197.
Jones, V.K.; Raleigh, Gregory G.; Channel Estimation for Wireless OFDM Systems; pp. 980-985.
Jia Ming
Ma Jianglei
Tong Wen
Zhu Peiying
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