Time-Varying FIR Transmultiplexers With Minimum Redundancy

Ribeiro, C.B.; Campos, Marcello L. R. de; Diniz, Paulo S. R.

doi:10.1109/tsp.2008.2010007

Cited by 13 publications

(6 citation statements)

References 26 publications

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“…For example, it is possible to employ a time-domain approach using matrix description, as described in [70,72]. For example, it is possible to employ a time-domain approach using matrix description, as described in [70,72].…”

Section: Time-domain Representationmentioning

confidence: 99%

Block Transceivers: OFDM and Beyond

Diniz

Martins

Lima

2012

Synthesis Lectures on Communications

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The demand for data traffic over mobile communication networks has substantially increased during the last decade. As a result, these mobile broadband devices spend the available spectrum fiercely, requiring the search for new technologies. In transmissions where the channel presents a frequencyselective behavior, multicarrier modulation (MCM) schemes have proven to be more efficient, in terms of spectral usage, than conventional modulations and spread spectrum techniques.The orthogonal frequency-division multiplexing (OFDM) is the most popular MCM method, since it not only increases spectral efficiency but also yields simple transceivers. All OFDM-based systems, including the single-carrier with frequency-division equalization (SC-FD), transmit redundancy in order to cope with the problem of interference among symbols. This book presents OFDM-inspired systems that are able to, at most, halve the amount of redundancy used by OFDM systems while keeping the computational complexity comparable. Such systems, herein called memoryless linear time-invariant (LTI) transceivers with reduced redundancy, require low-complexity arithmetical operations and fast algorithms. In addition, whenever the block transmitter and receiver have memory and/or are linear time-varying (LTV), it is possible to reduce the redundancy in the transmission even further, as also discussed in this book. For the transceivers with memory it is possible to eliminate the redundancy at the cost of making the channel equalization more difficult. Moreover, when time-varying block transceivers are also employed, then the amount of redundancy can be as low as a single symbol per block, regardless of the size of the channel memory.With the techniques presented in the book it is possible to address what lies beyond the use of OFDM-related solutions in broadband transmissions.

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Section: Time-domain Representationmentioning

confidence: 99%

Block Transceivers: OFDM and Beyond

Diniz

Martins

Lima

2012

Synthesis Lectures on Communications

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“…The performance of reduced-redundancy transceivers has been assessed by simulations in some works [5], [12]. By comparing the bit-error rate (BER) among systems with different amounts of redundancy, the authors in [5], [12] verify that the higher the amount of redundancy, the lower the BER of such systems.…”

Section: B Is Reduced Redundancy Better Than Minimum Redundancy?mentioning

confidence: 99%

“…By comparing the bit-error rate (BER) among systems with different amounts of redundancy, the authors in [5], [12] verify that the higher the amount of redundancy, the lower the BER of such systems. In addition, the author in [13] also shows that, even when one transmits in a single-carrier system with full-redundancy , if not all the redundant elements are used at the receiver end during the equalization process, then the mean-square error of symbols is also a monotone decreasing function of the number of redundant symbols used for the equalization.…”

Section: B Is Reduced Redundancy Better Than Minimum Redundancy?mentioning

confidence: 99%

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LTI Transceivers With Reduced Redundancy

Martins

Diniz

2012

IEEE Trans. Signal Process.

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This paper presents new linear time-invariant (LTI) block-based transceivers which employ a reduced amount of redundancy to eliminate the interblock interference. The proposals encompass both multicarrier and single-carrier systems with either zero-forcing or minimum mean-square error (MSE) equalizers. The amount of redundancy ranges from the minimum, 2 , to the most commonly used value, , assuming a channel-impulse response of order . The resulting transceivers allow for superfast equalization of the received data blocks, since they only use fast Fourier transforms and single-tap equalizers in their structures. The paper also includes an MSE analysis of the proposed transceivers with respect to the amount of redundancy. Indeed, we demonstrate that larger amounts of transmitted redundant elements lead to lower MSE of symbols at the receiver end. Computer simulations indicate that, by choosing an appropriate amount of redundancy, our proposals can achieve higher throughputs than the standard superfast multicarrier and single-carrier systems, while keeping the same asymptotic computational complexity for the equalization process.

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“…In non-DFT based method, analog filters were employed that cause large interference between adjacent channels of transmultiplexer. While DFT based method was implemented by fast Fourier transform (FFT), which has consented the competent channel equalization, as well as make them striking [18][19][20]. However, the selectiveness of DFT as FB is somewhat inadequate.…”

Section: Introductionmentioning

confidence: 99%