Z. Liu, Y. Xin, and G. B. Giannakis, "Space-Time-Frequency Coded OFDM over Frequency-Selective Fading Channels," IEEE Transactions on Signal Processing, vol. 50, no. 10, pp. 2465--2476, Oct. 2002.  Home/Search   Document Details and Download   Summary   Related Articles   Check

.... are presented, which are designed specifically for frequency selective channels in [13] In order to maximize embedded frequency diversity, joint space time frequency (STF) trellis coding applied to multi antenna OFDM transmissions through frequency selective fading channels was proposed in [14][15], resorting to the subcarrier grouping introduced by themselves [16] Likewise, for space time block codes (STBCs) originally proposed in [17] over frequency selective channels, either an equalizer is used to handle the ISI in [18] or OFDM transmission is adopted in [19] 20] Besides the ....

Z. Liu, Y. Xin and G. B. Giannakis, "Space-time-frequency coded OFDM over frequency-selective fading channels ", in IEEE Transactions on Signal Processing. vol. 50, No. 10, Oct. 2002, pp. 2465-2476.

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Z. Liu, Y. Xin, and G. B. Giannakis, "Space-Time-Frequency Coded OFDM over Frequency-Selective Fading Channels," IEEE Transactions on Signal Processing, vol. 50, no. 10, pp. 2465--2476, Oct. 2002.

.... by [58] and independently by [6] to enable FD at 1 symbol pcu, for any number of antennas (see also [61] reporting the first coding gain analysis of such LCF ST codes) For MIMO frequency and time selective channels, space, multipath, and Doppler diversity modes were enabled via LCF ST coding in [30,18,35,39,63]; but again, at transmission rates not exceeding 1 symbol pcu. For N t = 2 antennas, FD designs achieving 2 symbols pcu were proposed in [49,5,7] The first combination of LCF codes with a layered ST multiplexer trading o# space diversity for high (but not full) rates for any N t ,N r , appeared ....

....receive antenna, every P L samples are collected into a vector x # , and the first L samples are removed to eliminate the ISI from the previous block. The remaining P symbols are processed using FFT, and the resulting output is denoted by y # ,for the #th receive antenna (see also e.g. [30] for a detailed description of MIMO OFDM) Because OFDM converts a frequency selective channel to a set of frequency flat subchannels, the input output relationship between and y # can be expressed as: y # = H c w # , 14) is a P diagonal matrix with (p, p)th entry H #, p) ....

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Z. Liu, Y. Xin, and G. B. Giannakis, "Space-Time-Frequency Coded OFDM over Frequency-Selective Fading Channels," IEEE Trans. on Signal Processing, pp. 2465--2476, Oct. 2002.

.... fading channels [3] Various multi antenna designs have been developed targeting either high performance through space time coding (STC) or, high rate through layered transmissions: VBLAST [13] DBLAST [2] or, threaded ST (TST) 4] Recently, STC has been combined with LCF codes (see e.g. [6]) or other (e.g. trellis) codes to collect joint space and multipath diversity. VBLAST and DBLAST schemes have also been employed to improve transmission rates over frequency selective channels [14] However, none of these existing schemes achieves full diversity and full rate simultaneously. In ....

..... uN t (1) u 1 (N t ) uN t (N t 1) # # # (15) Given #, we can view det(#) as a polynomial in # with coefficients in Z(j) Using the method in [5, 15, 8] we can find # such that #s 0, det(#) #=0. We compare our FDFR with an existing scheme [6], for (N t ,N r ,L) 2, 2, 1) To maintain transmission rate R =4bits pcu, we use QPSK for our FDFR scheme, and 16QAM for the GSTF in [6] note that the rate deduction due to the cyclic prefix is not accounted for here) SD algorithm is used for GSTF and both SD and NC are tested for our FDFR ....

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Z. Liu, Y. Xin, and G. B. Giannakis, "Space-TimeFrequency Coded OFDM over Frequency-Selective Fading Channels," IEEE Trans. on Signal Proc., pp. 2465--2476, Oct. 2002.

....BLOCK CODED OFDM WITH SUBCARRIER GROUPING AND CONSTELLATION PRECODING Zhiqiang Liu, Yan Xin, Georgios B. Giannakis Dept. of ECE, University of Minnesota, 200 Union Str. SE, Minneapolis, MN 55455, USA E mails: lzq, yxin,georgios ece.umn.edu ABSTRACT This paper proposes novel space time frequency (STF) block coding for multi antenna OFDM transmissions over frequencyselective Rayleigh fading channels. Incorporating subcarrier group ing and choosing appropriate system parameters, ....

....BLOCK CODED OFDM WITH SUBCARRIER GROUPING AND CONSTELLATION PRECODING Zhiqiang Liu, Yan Xin, Georgios B. Giannakis Dept. of ECE, University of Minnesota, 200 Union Str. SE, Minneapolis, MN 55455, USA E mails: lzq, yxin,georgios ece.umn.edu ABSTRACT This paper proposes novel space time frequency (STF) block coding for multi antenna OFDM transmissions over frequencyselective Rayleigh fading channels. Incorporating subcarrier group ing and choosing appropriate system parameters, ....

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Z. Liu, Y. Xin, and G. B. Giannakis, "Space-time-frequency coded OFDM over frequency-selective fading channels," IEEE Trans. on Signal Processing, Oct. 2001, submitted.

....over intersymbol interference (ISI) channels can also afford low complexity equalization and decoding. Specific multi antenna systems with OFDM include the Vertical Bell labs Layered Space Time (VBLAST) OFDM [7] and the space time coded (STC) OFDM with ST trellis or block codes [1] [6], 3] VBLAST OFDM is rate oriented as it offers high spectral efficiency at an affordable receiver complexity, while STC OFDM is performance oriented since it is designed to maximize diversity and coding gains. However, the jack of both trades is not available: STC OFDM incurs rate loss ....

....to bridge this gap, and develop a high rate layered OFDM scheme with high performance, and flexibility to enable desirable tradeoffs among rate, performance, and receiver complexity. We reach these goals for frequency selective channels by wedding the OFDM subcarrier grouping ideas we put forth in [6], with linear constellation precoding (LCP) tools [4] 8] and the diagonal (D)BLAST architecture that was originally proposed for flat fading channels in [5] Manuscript received January 9, 2002. The associate editor coordinating the review of this letter and approving it for publication was ....

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Z. Liu, Y. Xin, and G. B. Giannakis, "Space--time-frequency coded OFDM over frequency-selective fading channels," IEEE Trans. Signal Processing, to be published.

....we know that ML decoding by means of G( achieves ra if the linear preceder O is designed in such a way that Oe has at least Nt(Q 1) non zero entries, for all possible error vectors e=s s O. One possibility is based on the Grouped Linear Constellation Precoding (GLCP) OFDM method proposed in [2] for frequencyselective channels. Using this method, me design a square N x N matrix O that can be written as O = IN N, Oa,b, where Ns,b is the group size chosen to satisfy N, b Nt(Q 1) and O, is a square N, x N, matrix chosen according to [2] Note that we then have N, N. ML ....

....Precoding (GLCP) OFDM method proposed in [2] for frequencyselective channels. Using this method, me design a square N x N matrix O that can be written as O = IN N, Oa,b, where Ns,b is the group size chosen to satisfy N, b Nt(Q 1) and O, is a square N, x N, matrix chosen according to [2]. Note that we then have N, N. ML decoding by means of ( can then be implemented by Sphere Decoding (SD) 7] on sub blocks of size N, b Nt(Q 1) We have shown that for i.i.d. BEM parameters hi ) the GLCP based method achieves the maximum coding gain within the class all square N x N LCP ....

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Z. Liu, Y. Xin, and G. B. Giannakis, "Space-Time-Frequency Coded OFDM over Frequency-Selective Fading Channels;' IEEE Trans. on Signal Proc., submitted Oct. 200 I.

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