Waveforms for fast fading channels

Visintin, Monica

doi:10.1049/el:20000658

Cited by 3 publications

(13 citation statements)

References 2 publications

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“…Several methods of receiver design for fast-fading channels have been proposed [8]- [14]. Pilot symbol assisted modulation [8] adds known symbols in the transmitted signal, allowing the receiver to estimate the channel in order to establish an amplitude and phase reference for detection.…”

Section: Introductionmentioning

confidence: 99%

“…Receivers for fast-fading channels based on filter banks are presented in [12]- [14]. In [12], the authors demonstrate two types of receivers based on single-filter and doublefilter.…”

Section: Introductionmentioning

confidence: 99%

“…It is claimed that, by a moderate increase in complexity compared to a matched filter receiver, the performance is close to optimal except at very high Signal-to-Noise Ratio (SNR). Another method of designing front-end filters is presented in [14], that employs the Karhunen-Loeve (KL) expansion [15] to approximate the autocorrelation function of the fading process by a finite dimensional separable kernel.…”

Section: Introductionmentioning

confidence: 99%

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A Receiver Structure for Frequency-Flat Time-Varying Rayleigh Channels and Performance Analysis

Shao¹,

Leib²

2016

IJCNS

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This paper proposes a wavelet based receiver structure for frequency-flat time-varying Rayleigh channels, consisting of a receiver front-end followed by a Maximum A-Posteriori (MAP) detector. Discretization of the received continuous time signal using filter banks is an essential stage in the front-end part, where the Fast Haar Transform (FHT) is used to reduce complexity. Analysis of our receiver over slowfading channels shows that it is optimal for certain modulation schemes. By comparison with literature, it is shown that over such channels our receiver can achieve optimal performance for Time-Orthogonal modulation. Computed and Monte-Carlo simulated performance results over fast time-varying Rayleigh fading channels show that with Minimum Shift Keying (MSK), our receiver using four basis functions (filters) lowers the error floor by more than one order of magnitude with respect to other techniques of comparable complexity. Orthogonal Frequency Shift Keying (FSK) can achieve the same performance as Time-Orthogonal modulation for the slow-fading case, but suffers some degradation over fast-fading channels where it exhibits an error floor. Compared to MSK, however, Orthogonal FSK provides better performance.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Receivers for fast-fading channels based on filter banks are presented in [12]- [14]. In [12], the authors demonstrate two types of receivers based on single-filter and doublefilter.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Receiver Structure for Frequency-Flat Time-Varying Rayleigh Channels and Performance Analysis

Shao¹,

Leib²

2016

IJCNS

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“…Visintin [1] introduced an incoherent transmission scheme that produces orthogonal signals at the output of a correlated Rayleigh fading channel, i.e. at the receiver.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, we call this modulation format incoherent orthogonal receive symbol keying. To the authors' knowledge there exists no research on this topic that is more recent than [1]. Visintin utilized the Karhunen-Loève (KL) expansion of the channel coefficients, and did not consider implementation issues except for the uncritical exemplary case of two basis functions and two transmit pulses using the classical Gram-Schmidt orthogonalization procedure.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal receive symbols at the receiver for fast-fading Rayleigh channels

2013

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In this article we consider uncoded single user spread spectrum systems for transmissions over frequency-flat, strongly time-variant (timely correlated) Rayleigh fading channels. The article extends the idea of [1] that designs transmit symbols such that they are orthogonal at the output of such a channel. Knowledge of the channel coefficient's auto-correlation function is assumed at the transmitter and at the receiver. We show a concrete and numerically stable algorithmic implementation that designs higher order modulations, while being able to handle larger time variances. A new algorithm is proposed that designs signals under a given bandwidth constraint. Algorithm initialization and convergence speed are improved. Bit error rate simulations show superior performance to classical incoherent orthogonal FSK transmission, and that the new transmission scheme is relatively robust against design or estimation errors regarding the channel's maximum Doppler frequency.

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Discretization methods of continuous time signals over frequency-flat fast-fading rayleigh channels

Shao

Leib

2012

2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE)

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Waveforms for fast fading channels

Cited by 3 publications

References 2 publications

A Receiver Structure for Frequency-Flat Time-Varying Rayleigh Channels and Performance Analysis

A Receiver Structure for Frequency-Flat Time-Varying Rayleigh Channels and Performance Analysis

Orthogonal receive symbols at the receiver for fast-fading Rayleigh channels

Discretization methods of continuous time signals over frequency-flat fast-fading rayleigh channels

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