Quasi-static SIMO fading channels at finite blocklength

Yang, Wei; Durisi, Giuseppe; Koch, Tobias; Polyanskiy, Yury

doi:10.1109/isit.2013.6620483

Cited by 181 publications

(308 citation statements)

References 10 publications

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“…To better understand the relevance of the outage capacity for delay-constrained communication, a more refined analysis of R * (n, ) was presented in [21]. It was shown that [21, Ths.…”

Section: Fading Channelsmentioning

confidence: 99%

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Toward Massive, Ultrareliable, and Low-Latency Wireless Communication With Short Packets

2016

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Abstract-Most of the recent advances in the design of highspeed wireless systems are based on information-theoretic principles that demonstrate how to efficiently transmit long data packets. However, the upcoming wireless systems, notably the 5G system, will need to support novel traffic types that use short packets. For example, short packets represent the most common form of traffic generated by sensors and other devices involved in Machine-toMachine (M2M) communications. Furthermore, there are emerging applications in which small packets are expected to carry critical information that should be received with low latency and ultrahigh reliability.Current wireless systems are not designed to support shortpacket transmissions. For example, the design of current systems relies on the assumption that the metadata (control information) is of negligible size compared to the actual information payload. Hence, transmitting metadata using heuristic methods does not affect the overall system performance. However, when the packets are short, metadata may be of the same size as the payload, and the conventional methods to transmit it may be highly suboptimal.In this article, we review recent advances in information theory, which provide the theoretical principles that govern the transmission of short packets. We then apply these principles to three exemplary scenarios (the two-way channel, the downlink broadcast channel, and the uplink random access channel), thereby illustrating how the transmission of control information can be optimized when the packets are short. The insights brought by these examples suggest that new principles are needed for the design of wireless protocols supporting short packets. These principles will have a direct impact on the system design.

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“…To better understand the relevance of the outage capacity for delay-constrained communication, a more refined analysis of R * (n, ) was presented in [21]. It was shown that [21, Ths.…”

Section: Fading Channelsmentioning

confidence: 99%

“…(59) and (95)]. For the singleantenna case, this approximation can be written in the following form [21], [22] …”

Section: Fading Channelsmentioning

confidence: 99%

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Toward Massive, Ultrareliable, and Low-Latency Wireless Communication With Short Packets

2016

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“…Specifically, according to [8,Eq. (59)], when m F is sufficiently large (i.e., m F > 100), the term ε F S,R can be tightly approximated as…”

Section: A Full-duplex Relaying (Fdr)mentioning

confidence: 99%

“…Obviously, the optimal source transmit power is given by P * S = P C . Substituting P * S = P C into (8), taking the derivative with respect to P R and considering the power constraint, we can obtain the optimal value of relay transmit power as P * R = min P C , PC ΩS,RND ΩR,RΩR,D . We surprisingly find out that the optimal values P * S and P * R at high SNR for a FDR under the finite blocklength regime is independent of the blocklength m. This is due to the approximation methods adopted in the asymptotic analysis of FDR.…”

Section: Remarkmentioning

confidence: 99%

Ultra-Reliable Short-Packet Communications: Half-Duplex or Full-Duplex Relaying?

Chen

et al. 2018

IEEE Wireless Commun. Lett.

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Abstract-This letter analyzes and compares the performance of full-duplex relaying (FDR) and half-duplex relaying (HDR) for ultra-reliable short-packet communications. Specifically, we derive both approximate and asymptotic closed-form expressions of the block error rate (BLER) for FDR and HDR using short packets with finite blocklength codes. We define and attain a closed-form expression of a critical BLER, which can be used to efficiently determine the optimal duplex mode for ultra-reliable low latency communication scenarios. Our results unveil that FDR is more appealing to the system with relatively lower transmit power constraint, less stringent BLER requirement and stronger loop interference suppression.Index Terms-Ultra-reliable, low latency, short-packet communication, finite blocklength, full-duplex relay. I. INTRODUCTIONIn conventional wireless systems, extremely long packet has been used in coding and transmission. However, to support ultra-reliable low latency communications (URLLC) as a new service type of 5G cellular systems [1], short-packet transmissions are essential. In this case, errors cannot be reduced to arbitrarily low for a given coding rate due to the limited packet size. Motivated by this, [2] developed a new fundamental framework for short-packet communications and derived an error probability bound for a given blocklength and coding rate. It was shown that the block error rate (BLER) increases as the blocklength of the system decreases. This new theoretical framework opens a new research direction for the revisit of conventional communication networks, which were mainly designed based on the Shannon formula and thus cannot be directly applied to short-packet communications.References [3], [4] investigated a classical three node cooperative network under finite blocklenth regime with static and quasi-static channel conditions. It was shown that there exists a performance tradeoff between cooperative and noncooperative communications: On the one hand, a relay can boost the power gains of both hops and thus improve the system performance; on the other hand, it can degrade the system performance by halving the blocklength of each packet transmission. However, only half-duplex relaying (HDR) was considered in [3], [4]. To the best knowledge of the authors, the performance of full-duplex relaying (FDR) under the finite blocklength regime has not been studied so far in open literature. Compared to HDR, FDR has a great potential to improve the system performance since it has a longer blocklength for each packet transmission, which is twice longer as that of HDR. On the other side, FDR suffers from additional interference caused by receiving and transmitting information at the same time, degrading the system performance [5], [6].

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