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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
In this thesis, we revisit differential and non-coherent transmission techniques over fading channels. In particular, we consider receiver design for differential space-time modulation (DSTM) over correlated multiple-input multiple-output (MIMO) fading channels and the performance analysis of differential phase shift keying (DPSK) and non-coherent frequency shift keying (FSK) in generalized K-fading. For DSTM over spatially correlated MIMO channels, we derive a multiple-symbol differential detection (MSDD) and a novel MSDD-based decision-feedback differential detection (MS-DFDD) receiver. We show that MS-DFDD outperforms previously proposed decision-feedback differential detection (DFDD) schemes that are based on scalar and vector prediction. In addition, we prove that at high signal-to-noise ratio (SNR) vector prediction decision-feedback differential detection (VP-DFDD) is equivalent to scalar prediction decision-feedback differential detection (SP-DFDD) and thus fails to properly exploit the spatial fading correlations. Furthermore, we derive closed-form expressions for the bit error probability (BEP) of two non-coherent transmission schemes over L diversity branches being subject to generalized K-fading. Specifically, focus is on binary DPSK (DBPSK) and binary non-coherent FSK modulation with equal-gain combining (EGC) at the receiver. We also discuss the extension of our results to M-ary modulation schemes. Considering both independent and correlated fading across the L branches, we derive expressions for the asymptotic diversity order, which reveal an interesting interplay between the two parameters, k and m, of the generalized K-distribution. Moreover, we show that the diversity order of the considered non-coherent transmission schemes is the same as in the case of coherent transmission. Finally, numerical performance results are presented, and our analytical results are corroborated by means of Monte-Carlo simulation.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
In this thesis, we revisit differential and non-coherent transmission techniques over fading channels. In particular, we consider receiver design for differential space-time modulation (DSTM) over correlated multiple-input multiple-output (MIMO) fading channels and the performance analysis of differential phase shift keying (DPSK) and non-coherent frequency shift keying (FSK) in generalized K-fading. For DSTM over spatially correlated MIMO channels, we derive a multiple-symbol differential detection (MSDD) and a novel MSDD-based decision-feedback differential detection (MS-DFDD) receiver. We show that MS-DFDD outperforms previously proposed decision-feedback differential detection (DFDD) schemes that are based on scalar and vector prediction. In addition, we prove that at high signal-to-noise ratio (SNR) vector prediction decision-feedback differential detection (VP-DFDD) is equivalent to scalar prediction decision-feedback differential detection (SP-DFDD) and thus fails to properly exploit the spatial fading correlations. Furthermore, we derive closed-form expressions for the bit error probability (BEP) of two non-coherent transmission schemes over L diversity branches being subject to generalized K-fading. Specifically, focus is on binary DPSK (DBPSK) and binary non-coherent FSK modulation with equal-gain combining (EGC) at the receiver. We also discuss the extension of our results to M-ary modulation schemes. Considering both independent and correlated fading across the L branches, we derive expressions for the asymptotic diversity order, which reveal an interesting interplay between the two parameters, k and m, of the generalized K-distribution. Moreover, we show that the diversity order of the considered non-coherent transmission schemes is the same as in the case of coherent transmission. Finally, numerical performance results are presented, and our analytical results are corroborated by means of Monte-Carlo simulation.
Author: Lei Zhao Publisher: ISBN: Category : Languages : en Pages : 82
Book Description
The optimal diversity-multiplexing tradeoff (DMT) has provided a comprehensive view for multiple-input multiple-output (MIMO) systems with multiple transmit and receive antennas. It is widely used as a benchmark to evaluate different space-time schemes in high signal-to-noise ration (SNR) regime. However, previous results depend on the assumption of independent and identical distributed (i.i.d) Rayleigh fading while practical channel models may be more complicated. In this thesis, we investigate for a family of MIMO fading channels the optimal DMT, which is characterized by the near zero and near infinity behaviors of its bounded probability density function (pdf). We believe this family is quite general since it includes i.i.d Rayleigh as well as many other known models as special cases. The progress we have made is built upon our analysis of the probability of the outage set. We find the relation between the parameters of a channel model and the probability of the dominant events in the outage set in high SNR regime. Two different methods are used to obtain the asymptotic outage probability for low and high multiplexing gains. Based on the outage result, we show that optimal DMT can be characterized exactly in a simple piece-wise linear function given long enough channel coherent length while we only provide lower and upper bounds for the optimal DMT when the channel coherent length is short. In the extension section, we consider the effect of correlation on optimal DMT given that the transmit correlation and receive correlation are separable. We also discuss the effect of non-zero-mean channel and derive the optimal DMT result for some specific fading types added with a determinant channel mean.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
I.e. RAKE, zero-forcing decorrelator, linear minimum mean-squared error (LMMSE) multiuser receivers, within a single-cell setting over generalized time-varying GWSSUS - Rayleigh/Ricean - fading channels via random matrix theoretic tools. Assuming maximal-ratio combining (MRC) of resolved frequency - multipath - diversity channels due to wideband transmission, the signal-to-interference ratios (SIRs) with multichannel multiuser receivers that set the basis for further derivations are statistically characterized. The information-theoretic ergodic and outage sum-rates spectral efficiencies are then derived and analyzed.
Author: Qin Zhu Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) techniques have been considered as a strong candidate for the next-generation - wireless communication systems, due to their well-known advantages in high data-rate wireless transmission as well as high frequency spectrum efficiency. In the mean time, channel state information (CSI) is required for precise detection and recovery of signals. Therefore, channel estimation plays a significant role in MIMO-OFDM systems. On the other hand, due to the high mobility of wireless terminals, Doppler shift (DS) can be one of the major side-effects of utilizing MIMO-OFDM techniques, which may lead to severe performance loss. Many schemes on DS estimation have been developed for broadband single-input single-output (SISO) systems. A commonly used method is to exploit the auto-correlation property of the channel impulse response (CIR) estimated by well-developed channel estimation approaches, which not only has high accuracy but also moderate computational complexity. Hence, we first investigate an efficient channel estimation method in this thesis. We will then focus on Jakes' model based DS estimation schemes, and further extend to independently identically distributed (i.i.d.) MIMO-OFDM fading channels with both Rayleigh and Rician distributions. In the first part of the thesis, a training-sequence (TS) based least square (LS) channel estimation scheme is presented for MIMO-OFDM systems along with plenty of computer simulations and corresponding analyses. Experimental study shows that the CIR estimates obtained by the LS method are reliable under moderate channel conditions, and can efficiently be utilized for DS estimation. The second part of the thesis first studies the auto-correlation function (ACF) based DS estimation schemes for SISO-OFOM systems in Rayleigh fading channels, and then extends it to Rician fading channels by developing a new approach along with the analysis of its accuracy and complexity. Thereafter, we apply those approaches to MIMO-OFOM systems and present a few enhanced methods by using non-linear interpolation under certain circumstances. Detailed computer simulations and comparisons are performed, confirming that the proposed ACF based schemes give satisfactory estimation performance over i.i.d. Rayleigh or Rician fading channels with various channel conditions.
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Author: Lei Zhao
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Author: Liu Li
Author: Alexander Vanaev
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Author: Mario Kießling
Author: Qin Zhu