TCMP-a modulation and coding strategy for Rician fading channels

Moher, M.; Lodge, J.

doi:10.1109/49.44580

Cited by 215 publications

(54 citation statements)

References 5 publications

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“…A estimação de canal é uma das questões fundamentais no desenvolvimento de um sistema OFDM, sem esta a detecção não coerente tem de ser utilizada, que incorre numa perda de desempenho na ordem dos 3-4 dB comparativamente à detecção coerente [24]. Uma classe popular de desmodulação para uma ampla classe de esquema de modulação digital foi proposta por Moher e Lodge [25], e é conhecida por Pilot Symbol Assisted Modulation (PSAM). A ideia principal da estimação de canal PSAM é multiplexar uma corrente de dados conhecidos com informação que não é conhecida.…”

Section: Levantamento Bibliográficounclassified

Robust channel estimation for broadband satellite communications

Balseiro

Souto

2011

2011 IEEE EUROCON - International Conference on Computer as a Tool

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ISCTE Outubro, 2010 i AgradecimentosEm primeiro lugar quero expressar o meu profundo apreço e sincera gratidão pelo meu orientador da dissertação Dr. Nuno Souto pelo seu esforço constante, orientação e inúmeros momentos de atenção que ele dedicou ao longo deste trabalho de investigação. As suas preciosas sugestões tornaram este trabalho interessante e desafiante para mim.Devo um agradecimento aos meus amigos pela sua ajuda, motivação e apoio.O apoio da família desempenha um papel fundamental no sucesso de uma pessoa.Gostaria de agradecer aos meus pais, irmão e outros membros da família incluindo todos os meus tios, tias e primos; do fundo do meu coração. O seu apoio incondicional sempre me ajudou a seguir os caminhos certos na vida.Um agradecimento especial para a minha namorada por me ter ajudado a ultrapassar os obstáculos, ter acreditado sempre em mim e na minha capacidade para desenvolver este trabalho, por me ter motivado e apoiado nos momentos mais difíceis.ii Resumo da DissertaçãoCom o rápido crescimento das comunicações digitais nos últimos anos, a necessidade de transmissões de dados a alta velocidade aumentou significativamente. Além disso, espera-se que os futuros sistemas sem fios sejam capazes de suportar uma ampla gama de serviços que Multiplexing (OFDM) is a promising candidate for achieving high data rates in mobile environment, due to its resistance Inter Symbol Interference (ISI), which is a common problem found in high speed data communication. In OFDM, modulation may be differential or coherent. When using differential modulation there is no need for a channel estimate but its performance is inferior than the coherent system. Coherent modulation requires the channel estimation which gives better performance but with relatively more complex receiver structure. In this thesis two channel estimation techniques will be studied: Pilot Symbol Assisted Modulation (PSAM) and implicit pilots. In the first case the pilots are multiplexed with the transmitted data, while in the second situation pilots are placed in positions along with the data. In this thesis, we consider different estimation techniques in terms of Bit Error Rate (BER) and Mean Square Error (MSE). In order to do this analysis a Land Mobile Satellite (LMS) channel model was proposed which will be the basis for the study of the robustness and efficiency of the estimation methods presented.

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Section: Levantamento Bibliográficounclassified

Robust channel estimation for broadband satellite communications

Balseiro

Souto

2011

2011 IEEE EUROCON - International Conference on Computer as a Tool

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“…The estimation of channel attenuation from known symbols multiplexed in the frame was introduced by Moher and Lodge [13] for single carrier systems under the name PSAM (pilot-symbol assisted modulation) and analyzed by Cavers [14]. The extension to multicarrier systems implies considering a two-dimensional space (time and frequency) with an increase in complexity that can be reduced if both dimensions are separated.…”

Section: Orthogonal Frequency Division Multiplexing (Ofdm)mentioning

confidence: 99%

Understanding the effects of phase noise in orthogonal frequency division multiplexing (OFDM)

Armada

2001

IEEE Trans. on Broadcast.

302

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Abstract-Phase noise must be carefully considered when designing an OFDM-based communication system since an accurate prediction of the tolerable phase noise can allow the system and RF engineers to relax specifications. This paper analyzes the performance of OFDM systems under phase noise and its dependence on the number of sub-carriers both in the presence and absence of a phase correction mechanism. Besides some practical results are provided so as to give some insight into the phase noise spectral specifications that should be required to the local oscillator.

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“…A pilot symbol from a known pseudo-random sequence +p I , is inserted in each block of (¸!1) data symbols +d I G , as shown in Figure 2. A pseudo-random sequence of pilot symbols is used to avoid transmitting tones at multiples of the pilot symbol rate [3]. To minimize the error in fading estimation due to additive noise, the pilot symbols are chosen from the four outermost vectors in the 16QAM signal constellation [4].…”

Section: System Modelmentioning

confidence: 99%

Combining PSA fading estimation techniques for TCM and diversity reception in Rician fading channels

Ng¹,

Cheung

2001

Int. J. Satell. Commun.

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SUMMARYIn this paper, a novel pilot-symbol-aided (PSA) technique is proposed for fading estimation in the land mobile satellite fading channels. The proposed technique combines the fading estimates obtained from a bandwidth-e$cient technique and a conventional technique according to the signal-to-noise ratios (SNRs) of the fading estimates. To enhance the transmission quality, trellis-coded modulation (TCM) and diversity reception are employed in the system, and the combined estimates are subsequently used to correct the channel fading e!ects, to weight the signals from di!erent diversity branches, and to provide channel state information to the Viterbi decoder. Monte Carlo computer simulation has been used to study the bit-error-rate (BER) performance of the proposed technique on trellis-coded 16-ary quadrature amplitude modulation in the frequency non-selective Rician fading channels. Results have shown that the proposed PSA technique requires a very low bandwidth redundancy to provide satisfactory BER performance at low SNRs, and thus is suitable for use with TCM and diversity reception to achieve both bandwidth and power-e$cient transmission.

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TCMP-a modulation and coding strategy for Rician fading channels

Cited by 215 publications

References 5 publications

Robust channel estimation for broadband satellite communications

Robust channel estimation for broadband satellite communications

Understanding the effects of phase noise in orthogonal frequency division multiplexing (OFDM)

Combining PSA fading estimation techniques for TCM and diversity reception in Rician fading channels

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