Download RF Imperfections in High-rate Wireless Systems: Impact and by Tim Schenk PDF

By Tim Schenk

This is among the first books at the rising examine subject of electronic reimbursement of RF imperfections. The ebook provides a brand new multidisciplinary imaginative and prescient at the layout of instant communique structures. during this procedure the imperfections of the RF front-ends are authorized and electronic sign processing algorithms are designed to suppress their impression on approach functionality. The publication specializes in multiple-antenna orthogonal frequency department multiplexing (MIMO OFDM).

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Additional info for RF Imperfections in High-rate Wireless Systems: Impact and Digital Compensation

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This vector is transformed to the time domain using the IDFT and a CP is added for ISI robustness, yielding the Nt Ns ×1 baseband transmit vector u. The signals are subsequently up-converted to a common RF fc using the Nt RF front-ends and transmitted through the wireless MIMO multipath channel. At the RX, this signal is received on Nr RX antennas and downconverted to baseband yielding the Nr Ns ×1 baseband received signal vector y. After removal of the CP, the signal is transformed to the frequency domain by the DFT, yielding the Nr Nc ×1 frequency-domain RX vector x.

0 . 8. Nt Add CP . . 1 P/S TX RF Frontend Nr .. 1 CP .. 0 . DFT Removal, . 1 .. S/P Nc − 1 y TX Nt .. TX 1 RX Nr .. RX 1 RX RF Frontend MIMO OFDM system model. section illustrated for a frequency flat channel. , L > 1, will no longer be valid when we want to apply MIMO to wideband systems to achieve high data rates. g. [49, 50], which, however, imposes a high computational burden. , MIMO OFDM, was proposed to overcome the problems with the frequency-selective channel. 2. 1 can be applied. A block diagram of such a multiple-antenna OFDM system is depicted in Fig.

1 W (Nc −1) W 2(Nc −1) . . W (Nc −1) 2 2π ). 3 System modelling where IN denotes the N -dimensional identity matrix and 0 is the allzeros matrix. 31) where the first term models the desired component, the second term is the ISI term and the AWGN is modelled in the third term. The Ns ×Ns matrices modelling the influence of the multipath channel are given by ⎡ g(0) .. 0 .. ⎢ . ⎢ ˘ =⎢ g(0) G ⎢ g(L − 1) . . ⎢ . ⎣ .. 0 g(L − 1) . . g(0) ⎡ ⎢ 0 ˆ =⎢ G ⎢ ⎣ 0 g(L − 1) . . g(1) .. . 2.

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