Frequency Domain Realization of Space-Time Receivers in Dispersive Wireless Channels (original) (raw)
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14th IEEE Proceedings on Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003., 2000
Recently, space-time block coding has emerged as a promising spatial transmit diversity scheme, mainly due to its simple decoding complexity. As it was initially proposed, spacetime block coding was based on the assumption of flat multipath fading channel, where there is no intersymbol interference. In this paper, we investigate the performance of two different receiver proposals using space-time block coding for frequency selective fading channels. The first one, called here equalization pos-combining with channel estimation receiver, is based on the time-reverse space-time block coding proposed by Lindskog and Paulraj and it performs channel-estimation, linear combination and equalization. The second one, denoted here multiple-input multiple-output joint equalization-combining receiver, is based on the scheme presented by Meshkati and Sousa and it performs channel equalization, interference cancellation and linear combination simultaneously. Simulation results show that, increasing the signal to noise ratio, multiple-input multipleoutput joint equalization-combining can outperform equalization pos-combining with channel estimation. I.
Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738), 2000
Equalization post-combining with channel estimation (EPCCE) has recently been presented for applications with space-time block coding in frequency selective fading channels. In spite of offering full diversity, EPCCE can suffer from performance degradation due to imperfect channel estimate. In this paper, we propose a new EPCCE receiver using decision feedback equalization (DFE) and iterative channel estimation based on inter-antenna interference cancellation in order to improve the channel estimate and the performance of the receiver when the number of training symbols is limited.
Low-Complexity Iterative Receiver for Space-Time Coded Signals over Frequency Selective Channels
Eurasip Journal on Advances in Signal Processing, 2002
We propose a low-complexity turbo-detector scheme for frequency selective multiple-input multiple-output channels. The detection part of the receiver is based on a List-type MAP equalizer which is a state-reduction algorithm of the MAP algorithm using per-survivor technique. This alternative achieves a good tradeoff between performance and complexity provided a small amount of the channel is neglected. In order to induce the good performance of this equalizer, we propose to use a whitened matched filter (WMF) which leads to a white-noise "minimum phase" channel model. Simulation results show that the use of the WMF yields significant improvement, particularly over severe channels. Thanks to the iterative turbo processing (detection and decoding are iterated several times), the performance loss due to the use of the suboptimum List-type equalizer is recovered.
IEEE International Conference on Communications, 2003
Diversity transmission at the base station is an effective technique to combat adverse effects of fading. This is suggested as an alternative to diversity at the terminal, thereby reducing the implementation complexity. In this paper, we present a transmission scheme that combines space-time block coding over frequency selective channels with single carrier frequency domain interference suppression and equalization. It is shown that this scheme will provide the diversity benefit of both the frequency selective channel and the space-time block code while completely suppressing the interference from another co-channel transmitter that occupies exactly the same channel (time & frequency) as the desired transmitter.
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Data is encoded using a space–time block code and the encoded data is split into n streams which are simultaneously transmitted using n transmit antennas. The received signal at each receive antenna is a linear superposition of the n transmitted signals perturbed by noise. The wireless systems that is evolved the last few decades necessitates in the design and analysis of equalization techniques. Future generation of wireless system is supposed to possess very high spectral efficiency. When data is transmitted at high rates over mobile radio channels, impulse response can extend over many symbol periods which lead to Inter Symbol Interference. Space– time block codes [STBC] are designed to achieve the maximum diversity order for a given number of transmit and receive antennas subject to the constraint of having a simple decoding algorithm. In this paper, we present the performance analysis of Alamouti STBC and MIMO Equalization. Compare MIMO -STBC with SISO, MRC and 2x1 and 2x2 Alam...
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IEEE International Conference on Acoustics Speech and Signal Processing, 2002
A novel receiver for space-time coded systems based on the reduced rank multistage Wiener filter (MWF) is presented. It is shown that this receiver has a complexity that is only a linear function of the processing gain (N ), the number of transmit antennas (L t ), and the rank (D) of the MWF. The complexity of the equivalent MMSE solution is a function of (NL t ) 3 . It is also demonstrated by numerical simulation that this receiver meets MMSE performance at a significantly lower rank. The MMSE implementation is derived and performance is evaluated for highly loaded synchronous CDMA systems in flat fading.
Iterative frequency-domain detection and channel estimation for space-time block codes
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In this paper, we consider iterative frequency-domain receivers for block transmission techniques with rate-1 space-time block coding (STBC) for two or four transmit antennas. Single carrier with frequency-domain equalisation (SC-FDE) combined with antenna diversity is a promising candidate for future broadband wireless systems. Because our STBC with four transmit antennas is not orthogonal, our receiver includes the cancellation of the residual interference, allowing performances close to the ones of an orthogonal code.
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Recent results in information theory have demonstrated the enormous potential of wireless communication systems with antenna arrays at both the transmitter and receiver. To exploit this potential, a number of layered space-time architectures have been proposed. These layered space-time systems transmit parallel data streams, simultaneously and on the same frequency, in a multiple-input multiple-output fashion. With rich multipath propagation, these different streams can be separated at the receiver because of their distinct spatial signatures. However, the analysis of these techniques presented thus far had mostly been strictly narrowband. In order to enable high-data-rate applications, it might be necessary to utilize signals whose bandwidth exceeds the coherence bandwidth of the channel, which brings in the issue of frequency selectivity. In this paper, we present a class of layered space-time receivers devised for frequency-selective channels. These new receivers, which offer various performance and complexity tradeoffs, are compared and evaluated in the context of a typical urban channel with excellent results.