On the spectral efficiency of full-duplex small cell wireless systems

Nguyen, Duy H. N.; Tran, Le-Nam; Pirinen, Pekka; Latva-aho, Matti

doi:10.1109/twc.2014.2334610

Cited by 245 publications

(265 citation statements)

References 39 publications

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“…2 In (5), ρ i denotes the average power gain of the ith SU transmitterreceiver pair, η ii denotes the average power gain of the selfinterference channel at the ith SU pair, and η ij denotes the average power gain of the interference channel between the nodes at the ith and jth SU pair.…”

Section: (A)mentioning

confidence: 99%

“…Interested readers can refer to [55] in which the precoder designs under discrete constellations have been considered. 2 Since the SU receiver cannot differentiate the interference generated by the PUs from the background thermal noise, the noise vector n (a) i in (5) captures the background thermal noise as well as the interference generated by the PUs. This assumption is also adopted in [32]- [37].…”

Section: (A)mentioning

confidence: 99%

“…We compare the proposed algorithm with the HD algorithm under the 3GPP LTE specifications for small cell deployments [62]. We consider small cells, since they are considered to be suitable for deployment of FD technology due to low transmit powers, short transmission distances and low mobility [2], [3], [63]. A single hexagonal cell having a BS in the center with M 0 = 2 transmit and N 0 = 2 receive antennas with randomly distributed K = 3 UL and J = 3 DL users equipped with 2 antennas is simulated.…”

Section: B Cellular Systemmentioning

confidence: 99%

“…In addition to relay nodes, small cells which extend the service coverage and/or increase network capacity can be deployed in the FD mode due to low transmit powers, short transmission distances and low mobility. A small cell network where a FD base station (BS) serves multiple uplink (UL) and downlink (DL) users operating in the HD mode has been considered in [2]- [5]. Moreover, cognitive radios, which substantially increase spectrum utilization efficiency by allowing unlicensed users to share the spectrum with licensed users, can be deployed in the FD mode.…”

mentioning

confidence: 99%

“…In addition to selfinterference at the BS, the optimization problem is exacerbated by the co-channel interference (CCI) caused by the UL users to DL users. Sum-rate maximization for FD multi-user systems has been investigated in [2], [27]- [29]. However, the CCI is not taken into account in [27], single-antenna users are assumed in [2], and these works [2], [27] and [28] did not consider any transmitter/receiver distortion.…”

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confidence: 99%

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MSE-Based Transceiver Designs for Full-Duplex MIMO Cognitive Radios

Cırık

Wang

Rong

et al. 2015

IEEE Trans. Commun.

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Abstract-We study two scenarios of full-duplex (FD) multipleinput-multiple-output cognitive radio networks: FD cognitive ad hoc networks and FD cognitive cellular networks. In FD cognitive ad hoc networks (also referred as interference channels), each pair of secondary users (SUs) operate in FD mode and communicate with each other within the service range of primary users (PUs). Each SU experiences not only self-interference but also interuser interference from all other SUs, and all SUs generate interference on PUs. We address two optimization problems: one is to minimize the sum of mean-squared errors (MSE) of all estimated symbols, and the other is to minimize the maximum per-SU MSE of estimated symbols, both of which are subject to power constraints at SUs and interference constraints projected to each PU. We show that these problems can be cast as a second-order cone programming, and joint design of transceiver matrices can be obtained through an iterative algorithm. Moreover, we show that the proposed algorithm is not only applicable to interference channels but also to FD cellular systems, in which a base station operating in FD mode simultaneously serves multiple uplink and downlink users, and it is shown to outperform HD scheme significantly.

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Section: (A)mentioning

confidence: 99%

Section: (A)mentioning

confidence: 99%

Section: B Cellular Systemmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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MSE-Based Transceiver Designs for Full-Duplex MIMO Cognitive Radios

Cırık

Wang

Rong

et al. 2015

IEEE Trans. Commun.

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Full‐Duplex in Small‐Cell Networks

Hong

2019

Wiley 5G Ref

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Based on recent advances in analog/digital circuits for self‐interference cancellation, the use of full duplex (FD) in small‐cell networks has been receiving increasing attention as a promising solution to cope with explosive demand for wireless communications. FD operation has the potential to double the spectral efficiency of point‐to‐point communications by enabling concurrent transmission and reception over the same frequency band. However, the spectral efficiency gain of FD can be significantly limited in small‐cell networks if traditional strategies developed for half duplex (HD) are reused without careful consideration of cross‐mode interference. In this article, we look at some major issues in developing FD communication strategies for small‐cell networks and introduce recent results on spectral efficiency gains of FD over HD in various networks. First, we focus on single‐antenna systems. To improve mitigate the cross‐mode interference, selection diversity is exploited by allocating the same channel to widely separated uplink/downlink users, opportunistically scheduling uplink/downlink user pair, and selecting FD/HD mode. In particular, the spectral efficiency gain of FD over HD can be at most about 20% in randomly deployed large networks. This low gain comes from the limited interference avoidance capability of single‐antenna systems. Second, we shift our focus to multi‐antenna systems. By means of multi‐antenna techniques, multi‐antenna system can effectively mitigate the aggregated network interference. In particular, the FD operation can asymptotically double the spectral in randomly deployed large networks with massive MIMO. Finally, we present challenges and opportunities in developing FD strategies for future small‐cell networks.

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