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Performances of serially concatenated continuous phase modulation (SCCPM) over ISI channels are studied. An improved iteratively detected receiver of SCCPM over ISI channels is proposed, which improves the performance from the two aspects of equalizer and iterative method. An improved iterative interference canceller (IC) for SCCPM is proposed. In order to solve the problem of positive feedback during...
Single carrier transmission with cyclic prefix (SC- CP) has been adopted in wireless applications as an alternative air interface to orthogonal frequency division multiplexing (OFDM). In this paper, we compare the time and frequency domain equalization schemes utilizing regular LDPC codes in SC-CP system. Simulation results show that CP can be employed for better decoding in a multipath environment...
The Expectation-Maximization (EM) algorithm is studied to perform channel estimation in a low cost and high data rate impulse radio UWB receiver. The system under consideration uses a pulse position modulation with a simple analog energy detector. In order to overcome the problems inherent to high data rates, such as inter-symbol interferences, a probabilistic equalizer is used. The EM algorithm and...
In this paper we present the mutual information of a bit-interleaved V-BLAST space-time architecture. We assume interference cancellation by successive detection using MMSE equalizers without decoding of the channel codes. The mutual information is dependent on the MIMO channel realization and the detection order. However, the mutual information is very similar to that of an AWGN channel when plotted...
Previous researches regard the signals from other users as interfereces to be avoided in wireless ad-hoc network systems (e.g, IEEE 802.11/16). However, if the purpose of ad-hoc communications is relaying information from one node to another node through the third node, we can apply the network coding (NC) at the physical layer to increase a capacity by regarding a received signal from different nodes...
This paper covers the consideration of an iterative or turbo receiver where the nonlinear trellis-based detection of the interleaved and coded data bits is replaced by linear detection using the Wiener filter (WF), i.e., the optimal linear filter based on the mean-square error (MSE) criterion. The equalization of channels with multiple antennas at the receiver as well as frequency-selective transfer...
An optimal equalizer for the transmission of densely modulated signals on nonlinear ISI channels requires the use of full-branched BCJR algorithm, which has an extremely high complexity. This paper proposes a new nonlinear equalization approach that significantly lowers the complexity and yields good performance at the same time. Multilevel coding is performed at the transmitter, and multistage equalization...
This paper investigates mobile broadband communications, which undergo time-varying radio channels with large multipath delay spread. Space-time block transmission and single carrier modulation are adopted at the transmitter to combat the inter-symbol interference resulted from, the multipath delay. The single carrier modems with frequency-domain equalization have similar performance and complexity...
In this paper, we propose a novel frequency domain turbo equaliser for multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) transmission in channels where the maximum excess delay exceeds the length of the guard interval. The turbo equaliser is based on minimum mean square error filtering and utilizes the soft feedback from channel decoding for the joint separation...
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