High bit rate digital subscriber line echo cancellation

Chen, W.Y.; Dixon, J.L.; Waring, D.L.

doi:10.1109/49.93095

Cited by 40 publications

(12 citation statements)

References 15 publications

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“…This means that the value of N lobes (α) must be properly chosen. 13 The criteria adopted in this regard are contained in Appendix G.…”

Section: A Realistic Assumptions 1) Coupling-channel: Equationsmentioning

confidence: 99%

“…T HE ISSUE of echo cancellation has been investigated for many decades in the wireline communication area, especially in the context of telephone lines, digital subscriber lines (DSL), and discrete-multi-tone (DMT) transmissions [1]- [13].…”

Section: Introductionmentioning

confidence: 99%

“…The main lobe, whose duration is twice the other lobes, is counted twice 13. This approximation of an ideal raised-cosine filter is adopted each time such kind of filter has to be implemented on an actual digital system.…”

mentioning

confidence: 99%

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Design Criteria for FIR-Based Echo Cancellers

Zabini

Pasolini

Andrisano

2016

IEEE Trans. on Broadcast.

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The most relevant impairment experienced by on-channel repeaters (OCRs) in single frequency networks scenarios is the presence of a coupling-channel between the transmitting and receiving antennas, that generates unwanted echoes. This phenomenon causes a degradation of the repeated signal and, above all, could lead to the instability of OCRs, owing to the positive feedback that could result. For this reason, OCRs are usually equipped with echo canceller units, aimed at removing the coupling contributions. In this paper, we consider a realistic OCR setup and we analytically derive proper design criteria for echo-cancellers, showing the role of system parameters and implementation aspects on their performance. Here, in particular, we investigate the joint effect of the estimation noise and the finite precision arithmetic of digital systems, the system sensitivity to different design parameters and the relation between the echo-cancelling performance and the probability of instability.Index Terms-Echo canceller, on-channel repeater, single frequency network, relay, stability.

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“…This means that the value of N lobes (α) must be properly chosen. 13 The criteria adopted in this regard are contained in Appendix G.…”

Section: A Realistic Assumptions 1) Coupling-channel: Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design Criteria for FIR-Based Echo Cancellers

Zabini

Pasolini

Andrisano

2016

IEEE Trans. on Broadcast.

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“…Thus it requires a sampling rate at or above 1 MHz. The result is, again, poles located very close to the unit circle [3]. In the upcoming digital HDTV, in principle the signal bandwidth is 4.5 MHz, which would then require a sampling rate of 9 MHz in the base band.…”

Section: Introductionmentioning

confidence: 97%

High Speed Adaptive Signal Progressing Using the Delta Operator

Fan

2001

Digital Signal Processing

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“…Using the Lagrange multiplier method, this objective can be reformulated as (3), only now the weighting factors need be such that the optimized solution satisfies the constraint on uncancellable echo power.…”

Section: Basic Formulationmentioning

confidence: 99%

Optimization of hybrid circuits for echo cancellation in high-rate digital subscriber line transmission

Chen

Lin³

Proceedings of APCCAS'94 - 1994 Asia Pacific Conference on Circuits and Systems

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Echo cancellation is common in full-duplex data transmission over pair-wire telephone lines. A well-designed hybrid circuit can lessen echo canceller's burden as well as reduce the A/D converter's complexity in a digital implementation. We formulate the task of hybrid design as an optimization problem where the objective function is a weighted average of post-cancellation echo power, echo canceller complexity, and A/D converter complexity. In contrast, prior work in this area appears to have not considered the effect of echo cancellation in problem formulation. We discuss proper forms for the objective function and employ one of them in a numerical study. The chosen objective function is a weighted sum-squares value of the transhybrid echo impulse response. We consider several simple balance network topologies for the hybrid. These networks range from a simple resistor to a fourth-order RLC circuit. The numerical results obtained show that there is significant advantage in using optimized higher-order balance networks, as compared to suboptimal balance networks or simple resistor balance, in terms of both echo cancellation efficiency and hardware complexity. Some topics for further study are indicated.

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High bit rate digital subscriber line echo cancellation

Cited by 40 publications

References 15 publications

Design Criteria for FIR-Based Echo Cancellers

Design Criteria for FIR-Based Echo Cancellers

High Speed Adaptive Signal Progressing Using the Delta Operator

Optimization of hybrid circuits for echo cancellation in high-rate digital subscriber line transmission

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