Advanced OFDM-CDMA HF modem with self-interference cancellation

Raos, I.; Cacho, A. Del; Álvarez, Irina Argüelles; Zazo, Santiago; Mendieta-Otero, E.; Santana-Sosa, H.; Pàez-Borrallo, J.M.

doi:10.1109/milcom.2003.1290133

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…2 , the MSE of ε is greatly improved when | | ε is away from 2. The maximum MSE of coarse ε is smaller than 3 10 − , while the MSE of ε generally is under 5 10 − .…”

Section: Vmentioning

confidence: 92%

Parameter Design and Frequency Synchronization for an OFDM Based HF Modem

Qunshan

Weixing

et al. 2008

2008 4th IEEE International Conference on Circuits and Systems for Communications

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With Orthogonal Frequency Division Multiplex (OFDM), a new implementation of the parallel HF modem specified in MIL-STD-188-110B is discussed. The key parameters are analyzed in detail and the analog quadrature modulation and demodulation modules in typical OFDM systems are simplified through Hilbert transform. In addition, the frequency offset estimation method based on short training sequences or several identical parts in one OFDM symbol is introduced and generalized to be used on several identical parts in more than one OFDM symbols. Moreover, an improved method with favorable MSE and twice estimation range of the former one is given, with the same training sequence length. It is shown that the modified method can also be used in other OFDM systems.

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“…2 , the MSE of ε is greatly improved when | | ε is away from 2. The maximum MSE of coarse ε is smaller than 3 10 − , while the MSE of ε generally is under 5 10 − .…”

Section: Vmentioning

confidence: 92%

Parameter Design and Frequency Synchronization for an OFDM Based HF Modem

Qunshan

Weixing

et al. 2008

2008 4th IEEE International Conference on Circuits and Systems for Communications

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“…The key issues are the following: the use of OFDM modulation and the use of MC-CDMA techniques inspired in mobile applications, increasing system robustness in front of deep spectral nulls and homogenizing performance over different subcarriers. Furthermore, once the transmission scheme has demonstrated to be efficient, complementary analysis, relaxing the delay constraint for data transmission [13], is a promising path to achieve new goals. This operation mode will increase data rate, by the increase of the constellation size and the use of combined interleaving and channel coding strategies.…”

Section: Conclusion and Future Research Linesmentioning

confidence: 99%

Real-link Performance of a SS-MC-MA High Frequency Radio Modem

Santana-Sosa

Raos

Zazo-Bello

et al. 2006

Multi-Carrier Spread-Spectrum

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The HF band data communication link has been traditionally desired by many of the large range transmission systems although it is associated to unfavorable performances as low transmission rate, large delay and low confidence in terms of link establishment and maintenance. Although transmission rates may be high enough to transmit digital voice, delay, usually over several second, has been the main handicap to let the systems provide interactive digital voice links. Indeed, there is no unclassified equipment with this capability. The main achievement of this proposal is that we are able to guarantee digital voice transmission with low latency, around 135 msec (modem+codec), providing a full interactive digital voice link. Performances of two new 2460 bps. HF modems are presented versus the 39-tone 2400 bps MIL-STD-188-110A modem, working over an ITU-R moderate channel. Futhermore, these results are corroborated by real tests carried out in a 1800 Km. link.

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“…Among these, multi-carrier CDMA (MC-CDMA), also known as orthogonal frequency division multiplexing CDMA (OFDM-CDMA), offers several key advantages such as immunity against narrowband interference and robustness in frequency-selective fading channels [2]. Such desirable properties make MC-CDMA an attractive choice for the present and future radio-communication systems; among these, we have satellite communications [3], high-frequency band modems [4], and systems based on the concept of cognitive radio [5].…”

Section: Introductionmentioning

confidence: 99%

PAPR reduction in SFBC MIMO MC-CDMA systems via user reservation

García-Otero

Paredes-Hernández

2011

EURASIP J. Adv. Signal Process.

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The combination of multicarrier code-division multiple access (MC-CDMA) with multiple-input multiple-output technology is attractive for broadband wireless communications. However, the large values of the peak-to-average power ratio (PAPR) of the signals transmitted on different antennas can lead to nonlinear distortion and a subsequent degradation of the system performance. In this article, we propose a PAPR reduction scheme for space-frequency block coding MC-CDMA downlink transmissions that does not require any processing at the receiver side because it is based on the addition of signals employing the spreading codes of inactive users. As the minimization of the PAPR leads to a second-order cone programming problem that can be too cumbersome for a practical implementation, some strategies to mitigate the complexity of the proposed method are also explored.

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Advanced OFDM-CDMA HF modem with self-interference cancellation

Cited by 4 publications

References 3 publications

Parameter Design and Frequency Synchronization for an OFDM Based HF Modem

Parameter Design and Frequency Synchronization for an OFDM Based HF Modem

Real-link Performance of a SS-MC-MA High Frequency Radio Modem

PAPR reduction in SFBC MIMO MC-CDMA systems via user reservation

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