Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2004-04-30
2008-10-14
Urban, Edward (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S063100
Reexamination Certificate
active
07437182
ABSTRACT:
The object of the present invention is to provide a wireless communication method and apparatus, which obtains both Multi-User Diversity (MUD) and Multi-User Multiplexing (MUM) effects simultaneously using multiple beams having random weights. In the wireless communication method, a transmission stage having M antennas (M is an integer equal to or greater than 1) selects B reception stages (B is an integer equal to or greater than 1) among K reception stages (K is an integer equal to or greater than 1) each having N antennas (N is an integer equal to or greater than 1) and generates B beams to transmit B signals in a multiple-access transmission manner. In the wireless communication method, the weight vector wb=[w1,b, w2,b, . . . , wM,b] is determined to generate the b-th beam (b is an integer equal to or greater than 1 and equal to or less than B) corresponding to the b-th signal among B signals so as to determine the weight of output values respectively allocated to M antennas for the purpose of respectively generating B signals. The weight vector is determined so that respective elements thereof are determined to prevent interference between the different beams of B beams from exceeding a preset threshold. B signals are transmitted through B multiple channels obtained by generating B beams depending on the weights of elements.
REFERENCES:
patent: 6597678 (2003-07-01), Kuwahara et al.
Viswanath et al., “Opportunistic Beamforming Using Dumb Antennas” published in IEEE Transactions in Information Theory, vol. 48, No. 6, Jun. 2002.
Gozali et al., “The Impact of Multiuser Diversity on Space-Time Block Coding”, published in IEEE Communications Letters, vol. 7, No. 5, May 2003.
Chung et al., “A Random Beamforming Technique in MIMO Systems Exploiting Multiuser Diversity”, published in IEEE Journal on Selected Areas in Communications, vol. 21, No. 5, Jun. 2003.
Hwang Sung-su
Lee Yong-hwan
Lee Yong-hwan
Nguyen Tu X
The Webb Law Firm
Urban Edward
LandOfFree
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