Frequency domain data transmission using reduced computational complexity algorithms

Peled, A.; Ruiz, A.

doi:10.1109/icassp.1980.1171076

Cited by 408 publications

(205 citation statements)

References 3 publications

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“…From the figure it is also clear that maximizing a is desirable, within (19), in order to widen the low quantization noise region around DC. Recall that the goal is to minimize the residual quantization noise in the spatial frequency bins which carry data rather than minimizing the total quantization noise power.…”

Section: Halftoning Designmentioning

confidence: 99%

“…The receive image is equal to the linear convolution of the transmit image and the channel PSF. By appending a cyclic extension [14,19] around the image, whose size is at least half the channel memory, the periodicity assumption of the DFT is satisfied and equalization is a complex multiplication per spatial frequency bin. In this case, the channel model (1) can be simplified in discrete spatial frequency domain (k 1 , k 2 ) as…”

Section: Spatial Discrete Multitone Modulationmentioning

confidence: 99%

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Two-dimensional binary halftoned optical intensity channels

Mohamed¹,

Hranilovic²

2008

IET Commun.

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This paper considers the capacity of two-dimensional optical intensity channels in which transmit images are constrained to be binary-level. Examples of such links exist in holographic storage, page-oriented memories, optical interconnects, two-dimensional barcodes, as well as MIMO wireless optical links. Data are transmitted by sending a series of time-varying binary-level optical intensity images from transmitter to receiver. Strict spatial alignment between transmitter and receiver is not required nor is independence among the spatial channels assumed. Our approach combines spatial discrete multitone modulation developed for spatially frequency selective channels with halftoning to produce a binary-level output image. Data is modulated in spatial frequency domain as dictated by a water pouring spectrum over the optical transfer function as well as channel and quantization noise. A binary-level output image is produced by exploiting the excess spatial bandwidth available at the transmitter to shape quantization noise out of band. We present a general mathematical framework in which such systems can be analyzed and designed. In a pixelated wireless optical channel application, halftoning achieves 99.8% of the capacity of an equivalent unconstrained continuous amplitude channel using 1 megapixel arrays.

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Section: Halftoning Designmentioning

confidence: 99%

Section: Spatial Discrete Multitone Modulationmentioning

confidence: 99%

Two-dimensional binary halftoned optical intensity channels

Mohamed¹,

Hranilovic²

2008

IET Commun.

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“…Throughout the paper, we assume that the length of the cyclic prefix (CP) in the OFDM system is greater than the length of the discrete-time baseband channel impulse response. This assumption guarantees that the frequency-selective fading channel indeed decouples into a set of parallel frequency-flat fading channels [18].…”

Section: A Ofdm-based Spatial Multiplexingmentioning

confidence: 99%

On the capacity of OFDM-based spatial multiplexing systems

Bölcskei

Gesbert

Paulraj³

2002

IEEE Trans. Commun.

789

417

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Abstract-This paper deals with the capacity behavior of wireless orthogonal frequency-division multiplexing (OFDM)-based spatial multiplexing systems in broad-band fading environments for the case where the channel is unknown at the transmitter and perfectly known at the receiver. Introducing a physically motivated multiple-input multiple-output (MIMO) broad-band fading channel model, we study the influence of physical parameters such as the amount of delay spread, cluster angle spread, and total angle spread, and system parameters such as the number of antennas and antenna spacing on ergodic capacity and outage capacity. We find that, in the MIMO case, unlike the single-input single-output (SISO) case, delay spread channels may provide advantages over flat fading channels not only in terms of outage capacity but also in terms of ergodic capacity. Therefore, MIMO delay spread channels will in general provide both higher diversity gain and higher multiplexing gain than MIMO flat-fading channels.Index Terms-Broad-band fading channels, diversity gain, ergodic capacity, MIMO, multiplexing gain, OFDM, outage capacity.

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“…Similarly, as in standard OFDM, the length of OFDM signal x is further extended by a cyclic prefix (CP) as illustrated in [22]. The use of CP provides some guard interval (GI) between consecutive OFDM transmissions, and involves copying the last N CP samples in x and placing them before the first sample in x. CP also serves to reduce channel induced inter-symbol interference (ISI).…”

Section: Transmittermentioning

confidence: 99%

A selective control information detection scheme for OFDM receivers

2016

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In wireless communications, both control information and payload (user-data) are concurrently transmitted and required to be successfully recovered. This paper focuses on block-level detection, which is applicable for detecting transmitted control information, particularly when this information is selected or chosen from a finite set of information that are known at both transmitting and receiving devices. Using an orthogonal frequency division multiplexing architecture, this paper investigates and evaluates the performance of a time-domain decision criterion in comparison with a form of Maximum Likelihood (ML) estimation method. Unlike the ML method, the proposed time-domain detection technique requires no channel estimation as it uses the correlation (in the time-domain) that exists between the received and the transmitted selective information as a means of detection. In comparison with the ML method, results show that the proposed method offers improved detection performance, particularly when the control information consists of at least 16. However, the implementation of the proposed method requires a slightly increased number of mathematical computations.

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Frequency domain data transmission using reduced computational complexity algorithms

Cited by 408 publications

References 3 publications

Two-dimensional binary halftoned optical intensity channels

Two-dimensional binary halftoned optical intensity channels

On the capacity of OFDM-based spatial multiplexing systems

A selective control information detection scheme for OFDM receivers

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