By Qiyue Zou

This dissertation addresses a few difficult difficulties rising from functional implementations of high-speed physical-layer conversation schemes. The demanding situations are attributable to the underlying physical-layer analog/RF (radio frequency) processing, which unavoidably introduces distortions into the baseband demodulation degree. Such distortions come up, for instance, in Orthogonal Frequency department Multiplexing (OFDM) modulation, which has been followed by way of numerous instant criteria. OFDM structures are recognized to be delicate to the IQ imbalance and section noise distortions brought within the sign down-conversion technique. those distortions heavily restrict the appropriate constellation dimension and decrease the possible transmission information expense. regularly, the matter has been alleviated via expanding the transmission energy of the service sign. during this dissertation, an alternate strategy is pursued through exploiting sign processing recommendations within the electronic area. bankruptcy 2 develops a two-stage scheme to catch up on section noise distortion in instant OFDM platforms. within the first level, block-type pilot symbols are transmitted and the channel coefficients are together envisioned with the part noise. within the moment degree, comb-type OFDM symbols are transmitted such that the receiver can together estimate the information symbols and the part noise. The joint results of IQ imbalance and section noise on OFDM platforms are analyzed in bankruptcy three, the place repayment schemes are proposed and their functionality is studied. In bankruptcy four, the nonlinear results brought on by the front-end analog processing are investigated within the context of wideband software-defined radio platforms. within the presence of robust blocker (interference) signs, such nonlinearities introduce serious pass modulation over the specified sign. The proposed electronic answer scans the vast spectrum and locates the specified sign and blocker indications. After down-converting those indications individually to the baseband, they're together processed to mitigate the cross-modulation interferences. it truly is proven that the proposed schemes can successfully mitigate those impairments, accordingly, simplifying the RF and analog circuitry layout when it comes to implementation rate and gear intake. The proposed method demonstrates how mixed-signal, i.e., joint analog and electronic, processing thoughts play a severe position in rising radio applied sciences.

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It is easy to verify that Tr{AA*} = iV||a|| 2 , Tr{AA*} = iV||a|| 2 , and Tr{(A - A)(A - A)*} = N\\ a - a ||2. 31) where R£/ = E{c'c'*}. 32) where Re/c = E { c V } . 30) becomes gNR = prop ^Tr{PRe,P*}-SNRo (1 - f Re {Tr { P R ? 33), we note that for each particular c, the optimal c' that minimizes c - P c/II 2 is given by C;-(P*P)_1P*C. We thus make the following approximation: c' « S0 = ( P * P ) _ 1 P*c. 37 It follows immediately that = E {(P*P) _1 P*cc*P (P*P) - 1 } = ( P ' P ) 1 P*RCP (P*P) _1 and Rg,c « E {c^c*} = E{(P*P) _1 P*cc*} = (P*P) _1 P*R C .

If the continuous-time impulse response function of the baseband channel is h(t) and the phase noise at the local oscillator is x[ N- 2] x[N-l] Parallel-toSerial Converter > (a) OFDM Modulator. AW . no] w rM Y[l] Serial-toParallel Converter Received Bits Bit Mapping « Parallel-toSerial Converter FF^; AN-11 Y[N-2] y[N-l] Y[N-l] Symbol Estimation (b) OFDM Demodulator.

5), if both A and H are known at the receiver, A H x is the desired signal component and w is the noise component. 29) where 'JV-1 Tv{E{AA*}} = N(^Ta%k) ,fc=0 35 = N. 4 Proposed Algorithm Using the proposed algorithm, we can get an estimate A of the phase noise matrix A. 5) can be rewritten as y = AHx + (A - A)Hx + w. 10). Let a be the corresponding estimate of a. It is easy to verify that Tr{AA*} = iV||a|| 2 , Tr{AA*} = iV||a|| 2 , and Tr{(A - A)(A - A)*} = N\\ a - a ||2. 31) where R£/ = E{c'c'*}.

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