Performance analysis of an echo-cancellation arrangement that compensates for frequency offset in the far echo

Wang, J.-D.; Werner, Jean-Jacques

doi:10.1109/26.1461

Cited by 16 publications

(3 citation statements)

References 10 publications

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“…The far echo may suffer somc phase rolling, when non-coherent analogue carrier systems are used within the connection (Wang and Werner 1988). A frequency offset is generated due to the modulation and demodulation processes.…”

Section: Echo Parametersmentioning

confidence: 99%

“…For example, if these gains are lower than necessary, convergence will be slow, and if they are higher than necessary, convergence will be erratic. If these constants are properly chosen, the PLL is said to be well engineered (Wang and Werner 1988). The system provides a compromise set of gain values, which is suitable for a wide range of channels.…”

Section: The Frequency Offsetmentioning

confidence: 99%

“…The first commercial echo canceller modem became available only in 1987. It is a CCITT (Comitt Consaultatif International Tkltgraphique et Telkphonique) V.32 standard and is finding increasing application in fast full-duplex data transmission systems over the general switched telephone network (GSTN) (Werner 1984, Wang andWerner 1988). In fact, the intent is to increase the rate to a point very close to the channel capacity limit of nearly 28000 bits per second over GSTN.…”

Section: Introductionmentioning

confidence: 98%

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A DSP-based microcomputer system for echo measurement in telephone networks

El-Hennawey

Hamied

Zaidan

et al. 1993

International Journal of Electronics

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A schematic design is presented for a stand-alone test device to measure all aspects of echo at the subscriber location'of dial lines in telephone networks. The proposed architecture is based on off-the-shelf components such as a general purpose PC and one of the available digital signal processing (DSP) boards with minimum additional hardware. Echo aspects are identified for measurements and the firmware (both hardware and software) of the design are presented. Although specific hardware components are chosen in the proposed system, the strategy of the design can account for different components. The system is tested in the laboratory using a telephone channel simulator under different conditions. It is also used in real telephone circuits. Samples of testing results are included.

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Section: Echo Parametersmentioning

confidence: 99%

Section: The Frequency Offsetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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A DSP-based microcomputer system for echo measurement in telephone networks

El-Hennawey

Hamied

Zaidan

et al. 1993

International Journal of Electronics

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An equalizer with carrier‐acquisition‐during‐training (CAT) algorithm for mobile radio

Yoshino

Ueda

Suzuki

1992

Electron. Comm. Jpn. Pt. I

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This paper investigates an adaptive equalizer with carrier frequency offset compensation for digital mobile radio transmission over several tens kbit/s. The performance of conventional adaptive equalizers for mobile radio severely degrades for receiving signals having carrier frequency offset which is caused by local oscillator frequency offset due to misadjustment, temperature dependence, and aging.Carrier frequency offset compensation for TDMA burst signaling requires both accurate and short-time measurements. However, both requirements have a tradeoff relationship and must be optimized. This paper proposes the carrier-acquisitionduringtraining (CAT) algorithm for transmissions allowing a training signal. First, two basic configurations and their equivalence are discussed. Next, computer simulations and real-time experiments with onechip DSP show the effectiveness of CAT by demonstrating training convergence, optimum parameter characteristics, and average BER performance under two-path selective fading with one-symbol delay difference and independent Rayleigh components.

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