Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-02-08
2005-02-08
Chin, Stephen (Department: 2634)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C370S326000
Reexamination Certificate
active
06853689
ABSTRACT:
A method and apparatus are described for estimating channels in a radio communication system using transmit diversity. Channel coefficients ĝ11,ĝ12,ĝ21,ĝ22associated with a transmit diversity channel may be estimated in a radio communication system having a Base Station (BS) and at least one Mobile Station (MS) includes a transmit diversity channel transmitted over at least two propagation paths from at least two antennas associated with a BS. A sequence of pilot symbols is provided for each of at least two antennas for transmission from the BS to a MS over the transmit diversity channel. A series of symbols r1, r2, r3, r4are received at the MS from the transmit diversity channel and a matrix P of values of the sequence of pilot symbols is established according to a relation which satisfies a full rank condition for the matrix P which may be stored together with P−1in a memory. Channels estimates are determined using the matrix and the received sequence.
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3GPP-standard, see 3rd Generation Partnership Project (3GPP), 3GPP RAN 25.211 V.2.1.0, Jun. 1999, Section 5.3.2.
“Universal Mobile Telecommunications System (UMTS); Physical Channels and Mapping of Transport Channels onto Physical Channels (FDD) (3G TS 25.211 version 3.1.1 Release 1999)”, ETSI TS 125 211 V3.1.1 (Jan. 2000).
Jiann-Ching Guey, et al., “Signal Design for Transmitter Diversity Wireless Communication Systems over Rayleigh Fading Channels”, IEEE Transactions on Communications, vol. 47, No. 4, Apr. 1999, pp. 527-537.
Burns Doane Swecker & Mathis L.L.P.
Chin Stephen
Telefonaktiebolaget LM Ericsson
Williams Lawrence
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