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Digital Audio and Video Broadcasting (DAB/DVB) has massive potential for the development of passive bistatic radar. The Digital broadcasting signal had been proved as a good ‘illuminator of opportunity’ for passive coherent location (PCL) radar systems. Digital terrestrial multimedia broadcasting (DTMB) was announced as the Chinese DTV standard in August, 2006. This paper presents a method for reception,...
In this paper, we have developed minimum Total mean squared error (MSE) joint linear transceiver design for Single-user multiple-input, multiple-output (SU-MIMO) systems employing an improper constellation schemes. It assumes Imperfect channel state information (CSI) is available at both ends of transmitter and receiver and design transceiver is subject to a total power constraint. Channel mean and...
This paper proposes a new scheme of the rate compatible low-density parity-check (RC-LDPC) coded single carrier-frequency domain equalization (SC-FDE) system where RC-LDPC codes are combined with SC-FDE modulations. To construct a class of different RC-LDPC codes, we take advantage of a base matrix constructed by the progressive edge growth (PEG) algorithm. A special code matrix structure is used...
There is a demand for high data rate wireless communications over channels which are subject to both time selective and frequency selective fading. To obtain low error rate communications over these channels with the previously proposed channel estimation methods requires a large proportion of the transmitted signal to be dedicated to pilots and/or extensive computations in the radio receivers. This...
Single-carrier frequency domain equalization (SC-FDE) has been standardized as an alternative of orthogonal frequency division multiplexing (OFDM) in IEEE 802.11ad and 802.15.3c. In addition, with the use of low density parity-check (LDPC) codes, multi-Giga bits transmission can be supported in 60-GHz millimeter-wave (mmW) WLAN/WPAN with desired decoding complexity. In this paper, we present and evaluate...
Abstract-We present a simple but efficientalgorithm that iteratively refines the channel estimate in a turbo equalizer exploiting soft feedback (a-posteriori likelihoods) from the decoder. This algorithm, denoted as 'Soft Interference Cancelation and Correlation' (SICC), repeatedly performs an interference cancelation step followed by correlation with symbol estimates derived from the output of the...
For additive white Gaussian noise (AWGN) channels, first we show that the conditional probability distribution of the symbol error ratio (BER), in n transmitted symbols, can be modeled as lognormal in BPSK, QPSK and QAM transmission schemes, for a given average probability of symbol error p, and then we show that the channel signal-to-noise ratio (SNR), conditioned to p, can be modeled as a Gaussian...
This paper presents a novel base station (BS) cooperation scheme to address issues on fatal links experienced by cell-edge users based on bit interleaved repetition coded (BIRC) concatenated structures for downlink OFDM scenarios. A primary focus is on employing independent random interleavers in cooperating BSs following by BS cooperation which may be regarded as the repetition code. In early works...
Two methods are developed that can be applied to generate secret keys automatically from fading propagation channels that are reciprocal but have arbitrary (i.e. non Gaussian) statistics. Such methods may be necessary for physical-layer key generation in cases where the line-of-sight (LOS) component produces Rician channel statistics, not only because channel quantization based on Gaussian statistics...
Frequency-domain implementation for parallelized filtering and timing recovery combined with data-aided channel estimation is reviewed for low-complexity high-speed processing. Furthermore, replacement of carrier recovery by simple soft-differential demodulation with subsequent non-redundant error correction is proposed.
Multi-user spread-spectrum techniques are increasingly being considered for communications in underwater acoustic channels, which vary from stationary with sparse arrivals to rapidly varying channels. Downlink adaptive multiuser architectures, direct form interference cancellation IC-IDMA and separate channel estimation (CE) based Rake IDMA receivers are investigated and applied to simulated data...
The principal design problem encountered in wireless communications is how to overcome the distortion of received signals by a time-varying and frequency-selective propagation path due to the phenomenon called fading. In this paper, a channel coding method referred as pilot symbol assisted rateless coding (PSAR) is considered to mitigate the effects of fading; where a predetermined fraction of binary...
A novel approach is here presented to embed a low-priority data stream into a high-priority data stream for OFDM wireless communications. The main improvement with respect to conventional hierarchical modulations is that the low-priority data stream can be decoded from the received subcarrier symbols without any previous equalization in case of multipath fading channel. As a consequence, the expected...
Coordinated Beamforming (CBF) has been studied in hope of mitigating the inter-cell interference experienced by cell-edge users. Unfortunately, due to the limitations and/or impracticalities of the proposed designs, the expected performance gains have yet to be realized. In this work, a decentralized framework (and various example designs) is proposed for the practical transceiver and signaling design...
In this paper, we present a method which jointly performs robust channel estimation and signal detection over rank-deficient MIMO links. This technique achieves an excellent estimation of the channel matrix by using all detected symbols within a data frame. Symbol detection is achieved by means of a sphere decoding algorithm. The proposed scheme is equivalent to having the training preamble occupy...
The present work focuses on low complexity (LC) Linear Minimum Mean Square Error (LMMSE) schemes in conjunction with the existing paradigm of turbo equalization (TE). As a consequence, the LC LMMSE equalizer was extended to new scenarios with unknown frequency selective fast fading Rayleigh channels. In this paper, the generalized Valenti and Woerner estimator is coupled with a LMMSE and LC LMMSE...
In this paper, we evaluate a multilevel coding (MLC) scheme with multistage decoding (MSD) designed for satellite broadcasting communications. The impact of three different satellite system impairments on the decoding performance is analyzed. First, the influence of errors introduced by the channel estimation is discussed, assuming a typical data-aided (DA) channel estimator with different pilot lengths...
Coherent space-time codes perform not so excellent in high moving speed case due to the inaccurate channel estimation. However, differential space-time code is appealing in this case because no channel estimation is needed. While in low and middle signal-to-noise ratio regions differential space-time codes are inferior to the coherent ones. To achieve an excellent performance in a various moving speed...
Cooperative relaying is a promising technique for improving the performance of weak communication links in wireless networks by exploiting spatial diversity induced by relay transmissions. This paper considers cooperative relaying schemes for a narrow- band frequency hopping system. A novel hybrid relaying scheme called opportunistic hybrid relaying, which is specifically designed for this system,...
Imperfect channel estimation results in the introduction of symbols coupling for system with space time codes encoding when decoded by the mismatched filter. The bootstrap algorithm was suggested to be used as a signal separator at the output of the mismatched filter. In this work, this solution is studied in details for the Alamouti's code. An inherent problem of the bootstrap's weights control process...
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