Source: http://www.google.com/patents/US8027407?dq=5,825,242
Timestamp: 2015-05-24 05:25:14
Document Index: 307880280

Matched Legal Cases: ['Application No. 07861675', 'Application No. 07862325', 'Application No. 07862325', 'Application No. 08756664', 'Application No. 08767750', 'Application No. 08767751', 'Application No. 09718026', 'Application No. 2008', 'Application No. 2008', 'Application No. 2008']

Patent US8027407 - Method and apparatus for asynchronous space-time coded transmission from ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA method and apparatus is disclosed herein for asynchronous space-time coded transmission from multiple stations. In one embodiment, the method comprises one or more terminals and at least two base stations wirelessly communicating information-bearing signals to the one or more terminals using orthogonal...http://www.google.com/patents/US8027407?utm_source=gb-gplus-sharePatent US8027407 - Method and apparatus for asynchronous space-time coded transmission from multiple base stations over wireless radio networksAdvanced Patent SearchPublication numberUS8027407 B2Publication typeGrantApplication numberUS 11/644,638Publication dateSep 27, 2011Filing dateDec 21, 2006Priority dateNov 6, 2006Fee statusPaidAlso published asEP2080305A1, US20080123618, WO2008057452A1Publication number11644638, 644638, US 8027407 B2, US 8027407B2, US-B2-8027407, US8027407 B2, US8027407B2InventorsHaralabos PapadopoulosOriginal AssigneeNtt Docomo, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (71), Non-Patent Citations (150), Referenced by (17), Classifications (13), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for asynchronous space-time coded transmission from multiple base stations over wireless radio networks
Although the decoding complexity of the optimal decoder for arbitrary STBCs is exponential in the number k of jointly encoded symbols, there exist designs with much lower complexity. One such attractive class of designs, referred to as orthogonal space-time codes (OSTBCs), can provide full diversity while their optimal decoding decouples to (linear processing followed by) symbol-by-symbol decoding. Full rate OSTBCs exist only for a two transmit-antenna system. For three or more antennas, the rate cannot exceed � symbols/per channel use. This rate is achievable for n=3 and n=4 antennas. For more than four antennas the highest-rate OSTBCs are not known in general. In general, a rate equal to � symbols/channel use is always achievable, but, often, higher rates may also attainable for specific values of n.
Similarly, in FIG. 2, s(1), s(2), . . . , s(k), denote a typical block of k information-bearing symbol input vectors of dimension N that are inputs to the induced OSTBC according to one embodiment of the present invention. The i-th vector s(i) is a vector (or block) of N scalar complex-valued, information-bearing symbols in the induced code (where N denotes the blocking factor in the construction). Given such a set of input vectors, induced encoder 201 generates an induced code that is represented by a matrix B with T rows and n columns, where T equals t times the sum of N and L. The output matrix B of induced code of dimension “T”�“n” may be represented as follows:
FIG. 4 shows the special case of generating a code to be used with a two-transmit base station system, where each base station has a single transmit antenna per base station using the Alamouti code. Referring to FIG. 4, the baseline Alamouti code (depicted via the matrix B above) codes two symbols, x(1) and x(2), over two time slots and two antennas. In particular, in the first time slot the ith antenna (for i=1,2) transmits symbol x(i), while in the second time slot the first antenna transmits the complex conjugate of x(2) and the second antenna transmits the negative of the complex conjugate of x(1). The induced code is shown with the matrix B above. In one embodiment, the signal samples transmitted by the ith base station (for i=1, 2) in time slots 1 through L+N are constructed from the ith block of symbols, s(i), as follows: (i) the unitary transformation F is applied on s(i); (ii) the output is prepended by a circular prefix. In one embodiment, the samples transmitted by the first antenna at times L+N+1 through 2�(L+N) are generated as follows: (i) apply a unitary transformation F on the element-wise conjugate of the vector s(2); (ii) apply transformation U on the resulting vector; (iii) prepend the resulting vector of dimension N with its L-sample circular prefix. The samples transmitted by the second antenna at time L+N+1 through 2�(L+N) are similarly constructed according to B. For more information on the Alamouti code, see S. M. Alamouti, “A Simple Transmitter Diversity Scheme for Wireless Communications,” IEEE Journal Selected Areas in Communications, pp. 1451-1458, October 1998.
FIG. 5 illustrates code construction for a four transmit base-station system, in which each base station employs a single transmit antenna. The baseline code is shown in FIG. 5 by the matrix B and is the maximum-rate four transmit antenna OSTBC. The associated induced space-time code is constructed according to Table 1 and is depicted by the matrix B. Referring to FIG. 5, the baseline OSTNC, matrix B, encodes 3 symbols over four samples per antenna at a rate of � symbols/channel use, and the associated induced OSTBC, B, encodes 3-times-N symbols at a time over 4-times-(N+L) samples/per base-station, at a rate � times N/(N+L) symbols/channel use. This code also provides a systematic induced OSTBC for a three transmit-base-station system (e.g., by dropping one of the columns of B). In one embodiment, the code is used in the context of a two-base station system in which each base station has two transmit antennas. In this case, columns 1-2 of B are associated with the two transmit antennas at the one of the base stations and columns 3-4 are associated with the two transmit antennas at the other base station.
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