Trellis coded modulation for informed receivers

Xiao, Xuepeng; Hong, Yi; Viterbo, Emanuele; Gupta, Anindya

doi:10.1109/iccw.2017.7962782

Cited by 5 publications

(1 citation statement)

References 11 publications

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“…in the literature, among them are the well-known convolutional codes and trellis coded modulation (TCM) [23,24]. These codes have been widely studied in the literature and they still continue to be subject of analysis [25][26][27]. In some cases, trellis codes provide closed form expressions for the bit error rate (BER) in fading channels [28][29][30].…”

Section: Related Work and Motivationmentioning

confidence: 99%

Bit error rate and spectral efficiency analysis of opportunistic wireless systems

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Different opportunistic transmission techniques were proposed for wireless communication systems. In this work, we explore the opportunistic technique in which the transmissions are made only when the fading is above a threshold. As result, this technique mitigates almost completely the undesirable effects produced by the fading channel.Seeking to potentialize the performance of the aforementioned opportunistic technique and aiming to analyze it in different scenarios, in this work different hybrid schemes combining opportunism with other transmission/reception techniques are proposed, modeled and analyzed. In particular, the opportunistic technique is combined with two different diversity schemes. Spatial diversity (or antenna array diversity) with maximal ratio combining (MRC) is firstly considered. Then, by assuming a multiuser scenario, the multiuser diversity technique is also employed with opportunistic transmission.As wireless communication systems typically employ error correcting codes, in this work opportunistic transmission with error correcting codes are employed. Specifically, convolutional codes and trellis coded modulation (TCM) are chosen in the analysis, once closed-form expressions to evaluate the bit error rate (BER) can be obtained.Later, an opportunistic code division multiple access (CDMA) is proposed. Thus, the performance of opportunistic transmission in environments with presence of own-cell interference (or multiple access interference -MAI) and co-cell interference (CCI) are evaluated. Therein, the uplink is analyzed and aspects as the channel reuse factor are considered in the analysis.Finally, by considering the opportunistic cellular system, the cellular spectral efficiency is evaluated. For this, an procedure to calculate the cell coverage radius for each modulation scheme is employed, by considering that adaptive modulation is used and that a target mean BER must be guaranteed.In general, BER and the spectral efficiency are performance indicators considered in this work to evaluate the proposed schemes. As result, closed-form expressions are derived and their accuracy are validated by employing Monte Carlos simulations. In the analysis, BPSK, QPSK and M-QAM modulations are considered. Moreover, additive white Gaussian noise (AWGN) and Rayleigh fading are assumed in the channel model.The results show that the derived expressions are highly accurate to model the performance of the proposed schemes. In addition, it is determined that the hybrid schemes improves the performance in relation to opportunistic systems.

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Section: Related Work and Motivationmentioning

confidence: 99%

Bit error rate and spectral efficiency analysis of opportunistic wireless systems

Garzón¹

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Performance Evaluation of Encoded Opportunistic Transmission Schemes

2019

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The performance of encoded opportunistic transmission schemes in wireless channels affected by Rayleigh fading and additive white Gaussian noise (AWGN) is analyzed. In opportunistic transmission, the information is transmitted only when the fading amplitude is above a threshold. For this, the receiver with the knowledge of the channel state information notifies the instants the transmitter should transmit. Opportunistic systems with convolutional error correcting codes or with trellis coded modulation are analyzed in terms of closed-form bit error rate (BER) expressions. Nevertheless, the approach presented can be employed with any kind of error correcting codes. Hence, the performance of turbo codes is also presented in the simulations. Monte Carlo simulations verify the accuracy of the derived expressions and provide insights on the system performance. Performance results show that uncoded and encoded opportunistic systems are superior to uncoded and encoded ordinary systems (non-opportunistic), respectively. In particular, the BER curves of the opportunistic system decay exponentially when the signal-to-noise ratio (SNR) increases. On the other hand, BER curves for ordinary transmission decay linearly, where the slope is proportional to the diversity that depends on the error correcting code. Thus, opportunistic systems require less SNR to guarantee the same BER of ordinary transmission. The BER gain increases as the SNR increases. It is also observed that uncoded opportunistic systems are even superior to encoded ordinary ones. The results are validated guaranteeing the same spectral efficiency for all the scenarios. Finally, due to the exponential decay of the BER curves, coding gain expressions, used in ordinary systems over AWGN, can be used as approximations for opportunistic transmission in fading channels. INDEX TERMS Wireless communication, opportunistic transmission, error correction codes, bit error rate, Rayleigh channels.

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Polar Codes for Informed Receivers

Huang

Shieh

2018

IEEE Commun. Lett.

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Trellis coded modulation for informed receivers

Cited by 5 publications

References 11 publications

Bit error rate and spectral efficiency analysis of opportunistic wireless systems

Bit error rate and spectral efficiency analysis of opportunistic wireless systems

Performance Evaluation of Encoded Opportunistic Transmission Schemes

Polar Codes for Informed Receivers

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