Localized discrete fourier transform spread OFDM (DFT SOFDM) systems for 4g wireless communication

... of Fourier Transform is sometimes called the Discrete Fourier Series, but is most often called the Discrete Fourier Transform You might be thinking that the names given to these four types of Fourier ... into another chunk of data Let's see how this applies to the topic at hand: the Discrete Fourier transform Notation and Format of the Real DFT As shown in Fi...

Ngày tải lên: 13/09/2012, 09:49

... called frequency domain multiplexing The Discrete Time Fourier Transform The Discrete Time Fourier Transform (DTFT) is the member of the Fourier transform family that operates on aperiodic, discrete ... the Fourier Transform family that not view the time domain as periodic (such as the DTFT), the symmetry must be around sample zero to produces a zero phase Chapter 10- Fourie...

Ngày tải lên: 13/09/2012, 09:49

... the duality property to be more symmetrical For instance, Figs (d), (e), and Chapter 11- Fourier Transform Pairs Time Domain 211 Frequency Domain 2 b Real Part a Impulse at x[0] c Imaginary part ... that the signal is aliased sin(BkM / N ) Mag X [ k] ' /0 /0 00 sin(Bk /N ) 00 Chapter 11- Fourier Transform Pairs Time Domain 213 Frequency Domain 20 a Rectangular pulse b Magnitude Ph...

Ngày tải lên: 13/09/2012, 09:49

... ND2=N/2 The Fast Fourier Transform in FORTRAN NM1=N-1 Data are passed to this subroutine in the J=1 variables X( ) and M The integer, M, is the DO 50 I=1,NM1 base two logarithm of the length of the ... using the FFT algorithm) First, move the N point signal into the real part of the complex DFT's time domain, and then set all of the samples in the imaginary part...

Ngày tải lên: 13/09/2012, 09:50

... to B TABLE 31-1 The Fourier Transforms Chapter 31- The Complex Fourier Transform 579 Fourier Series complex transform real transform j 2Bk t /T j X [k] e %4 synthesis x(t ) ' synthesis k' & x(t ... ways that the real Fourier transform is awkward When the complex Fourier transform was introduced, the problems vanished Wonderful, we said, the complex Fou...

Ngày tải lên: 13/09/2012, 10:20

... Fourier không phát 2.4.2 Phương pháp STFT: Để đạt biến đổi Fourier cục bộ, định nghĩa biến đổi Fourier cửa sổ Tín hiệu đầu vào nhân với hàm cửa sổ W (t - τ) sau lấy biến đổi Fourier Kết biến đổi ... giải: Phân tích tín hiệu thành phần dựa dãy xấp xỉ Một tín hiệu xấp xỉ thô cộng với chi tiết Trong không gian thô không gian chi tiết trực giao với Nói cách khác, tín h...

Ngày tải lên: 01/04/2013, 16:14

... Proakis and D G Manolakis, Digital Signal Processing ± Principles, Algorithms, and Applications, 3rd Ed., Englewood Cliffs, NJ: Prentice-Hall, 1996 [11] A Bateman and W Yates, Digital Signal Processing ... and h(n) are real-valued N-periodic sequences, y(n) is the circular convolution of x(n) and h(n) defined as y…n† ˆ x…n†  h…n†, n ˆ 0, 1, , N À 1, 7:1 :26† 312 FAST...

Ngày tải lên: 28/10/2013, 05:15

... Out[2]: Re[z] gives the real part of the complex number z In[3]: ?Im Out[3]: Im[z] gives the imaginary part of the complex number z DRAFT of Mathematics of the Discrete Fourier Transform (DFT),” ... conjugate of the complex number z In[5]: ?Abs Out[5]: Abs[z] gives the absolute value of the real or complex number z In[6]: ?Arg Out[6]: Arg[z] gives the argu...

Ngày tải lên: 31/03/2014, 15:21

... Now we focus on DT signals for a while The discrete Fourier transform or DFT is the transform that deals with a finite discrete- time signal and a finite or discrete number of frequencies Which frequencies? ... x[n], since if the sequences are simple ones whose DTFTs are known or are easily determined, we can simply multiply the two transforms and then “look up” the inverse...

Ngày tải lên: 08/06/2014, 20:19

... 31, 1982 [13] F A Gr¨ nbaum, The eigenvectors of the discrete Fourier u transform: a version of the Hermite functions,” Journal of Mathematical Analysis and Applications, vol 88, no 2, pp 355– ... value in the diagonal will not perturb the eigenvectors of the commuting matrix 3.2 Better Conditioned Bilinear Methods Bilinear transform can be considered as a tr...

Ngày tải lên: 21/06/2014, 16:20

... as: Mallat et al.: Discrete fourier transform-based TOA estimation in UWB systems EURASIP Journal on Wireless Communications and Networking 2012 2012:3 Author details ICTEAM Institute, Université ... for multi-carrier UWB (MC -UWB) signals Note that the main goal of this paper is to give the main ideas about DFT-based TOA estimation Many improvements can be introduced in...

Ngày tải lên: 21/06/2014, 17:20

... throughput For these high channel attenuations, the optimal frequency spreading factor is around 64 Figure 10 gives results with both time and frequency spreadings, that is, with 2D spreading ... case Figures and give results with time spreading and L f = 1, and with frequency spreading and Lt = 1, respectively In these figures only 1D spreading is then performed J.-Y Ba...

Ngày tải lên: 22/06/2014, 19:20

... × 25% + = 14 adders A 64-point FFT therefore requires 32 × × 14 = 2688 adders if MAG coding is used If we use the optimum rotator from [3], then the required adder can be further reduced to 1684 ... coprocessor then has three stages (a) The serial data transfer to the coprocessor (b) The computation of the DFT, until the first output value is available (c) The data transfer...

Ngày tải lên: 22/06/2014, 23:20

... 3.3 Discrete Fourier Transform Spread OFDM (DFTSOFDM) Systems OFDM system, with its advantages, is currently an effective scheme for wireless communications However, the major disadvantage of OFDM ... conventional FDM and OFDM Let sk for k = 0, 1, · · · N − be the source complex symbols of OFDM system Chapter Discrete Fourier Transform Spread OFDM (DFT-...

Ngày tải lên: 10/11/2015, 11:00