Space time coding for mimo rayleigh fading systems

... this thesis, space- time coding schemes for multiuser and single user systems are discussed Based on the performance analysis, the code design criteria for multiuser composite fading systems are ... outperform the existing space- time codes (STCs) The code design for generally correlated multiuser fading systems is discussed where three fading cases are investigated:...

Ngày tải lên: 14/09/2015, 12:11

... transmit antenna to the receive antenna is formed by a pulse-shaping transmit filter (e.g., a root-raised cosine pulse [3]), a multipath fading channel with P separable paths, an ideal lowpass ... low-complexity decoding scheme can be seen as a practical version of this asymptotically optimal scheme and differs in two key aspects that make it practical: (1) it uses a very shor...

Ngày tải lên: 23/06/2014, 00:20

... vectors of the sensors 3.3 Performance analysis for GLRT decision rule For the optimum ML decision rule, a closed-form performance analysis does not seem to be feasible However, fortunately such ... performance as the related STBC C for colocated antennas if all K > N sensors transmit The censored DSTBC with noisy sensor decisions approaches the performance of the DSTBC with error-f...

Ngày tải lên: 22/06/2014, 19:20

... facilitate performance assessment of potential space- time coding approaches in realistic propagation environments There are a variety of different approaches used for modeling the MIMO wireless ... RS is S Rmn,pq = Rm−p,n−q (1.30) For example, shift invariance is valid for the case of far-field scattering for linear antenna arrays with identical, uniformly spaced elements Compute...

Ngày tải lên: 07/12/2015, 01:12

... an open-loop MIMO OFDM-CDMA scheme using space-timefrequency spreading (STFS), in the presence of frequency-selective Rayleigh-fading channel The BER and BLER performance of the OFDM-CDMA system ... scheduling In addition, it offers better diversity/multiplexing trade-off The performance of MIMO OFDM–CDMA scheme using STFdomain spreading is investigated with zero-forcing...

Ngày tải lên: 18/06/2014, 22:20

... N c , the OFDM-CDMA 60 Proposed OFDM-CDMA 2D OFDM-CDMA Number of Users 50 40 30 20 10 0 10 12 14 16 SNR dB Figure 10 System throughput comparison for OFDM-CDMA system with 4Tx, 4Rx of the proposed ... scheduling In addition, it offers better diversity/multiplexing trade-off The performance of MIMO OFDM-CDMA scheme using STF-domain spreading is investigated with zero-fo...

Ngày tải lên: 20/06/2014, 21:20

... Hong, Performance analysis of space-time block codes in time-varying Rayleigh fading channels, ” in Proceedings of IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP ... compensation in MIMO channels We have considered the effect of imperfect carrier offset knowledge over the estimates of the channel gains and resulting probability of...

Ngày tải lên: 22/06/2014, 19:20

... application of (39) and (40), however, does not yield a tight bound of the bit error performance for TDMSDD and FD-MSDD over time- and frequency-selective Rayleigh fading channels As shown in [6] for ... Performance Analysis of MSDD for OFDM over Fading Channels (AWGN) channel In order to reduce this gap between the coherent detection and convention...

Ngày tải lên: 23/06/2014, 01:20

... on an FPGA has a single-clock latency Based on the complexity assessment in this section and the fact that we target an FPGA implementation where a number of dedicated multipliers are available, ... enhances numerical stability; and (d) an aggressive time-shared VLSI architecture The above techniques are quite general and are readily applicable to any MMSE- based MIMO detector implemen...

Ngày tải lên: 21/06/2014, 22:20

... UNITARY SPACE-TIME CODING The differential encoding and decoding schemes using star QAM method for unitary space-time coding are analyzed in this section The differential unitary space-time coding scheme ... orthogonal space-time coding (DOSTC) scheme and differential unitary space-time code (DUSTC) scheme, we develop the two multiple -amplitude differential space-tim...

Ngày tải lên: 22/06/2014, 23:20

... definition of X H (Ai (s)) from (16); and in (17e) the fact that Tr(·) is a linear operation 3.2 Construction of a class of linear quasi-orthogonal codes for any M We construct a class of quasi-orthogonal ... of quasi-orthogonal codes for achieving higher data rates [21, 22, 23, 24] The quasi-orthogonal codes were given for transmit antennas with rate 1, a...

Ngày tải lên: 23/06/2014, 01:20

... size of 10 24 symbols on slow fading channels xvii 13 7 13 7 13 8 13 9 14 0 14 0 14 4 14 4 14 5 14 5 14 6 14 6 15 0 15 1 15 2 15 3 15 4 15 5 15 6 15 9 16 0 16 1 16 2 16 3 xviii 5 .13 5 .14 5 .15 5 .16 5 .17 5 .18 5 .19 5.20 ... 6.4 .1 Comparison of HLST Architectures with Various Component Codes 14 9 14 9 15 0 15 2 15 3 15 4 15 8 16 0 16 1 16 1 16 2 16 2...

Ngày tải lên: 14/08/2014, 12:20

... log2 det In + = W log2 det diag + = W log2 + n P 2 = nW log2 + P 2 P 2 For the same numerical values nT = nR = n = and SNR of 20 dB, as in Example 1 .2, the normalized capacity C/W is 53 .26 4 ... C 2 > 1+ Wn P log2 + P 2 − log2 e + εn (1. 82) where the random variable εn has a Gaussian distribution with mean E{εn } = P log2 + n σ −1 /2 (1.83) and variance Var{εn } = nln2 · ln + P 2 −...

Ngày tải lên: 14/08/2014, 12:20

... l21 = a21 / l11 , ln1 = an1 / l11 2 a22 = l21 + l22 → l22 = (a22 − l21 ) a32 = l31 l21 + l32 l22 → l32 = (a32 − l31 l21 )/ l22 In general, for i = 1, 2, n, j = i + 1, n i−1 lii = aii ... (MIMO) wireless channels is to employ space-time (ST) coding [6] Space-time coding is a coding technique designed for use with multiple transmit antennas Coding is performed in both spatial and .....

Ngày tải lên: 14/08/2014, 12:20