Empowering full-duplex wireless communication by exploiting directional diversity

Everett, Evan; Duarte, Melissa; Dick, Chris; Sabharwal, Ashutosh

doi:10.1109/acssc.2011.6190376

Cited by 204 publications

(161 citation statements)

References 4 publications

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“…where the terms d T 2 , δ T 2 d R 1 , and δ R 1 are given in (17)(18)(19)(20) within the table at the bottom of the page.…”

Section: Lemma 2 the Spatial Degree-of-freedom Tuplesmentioning

confidence: 99%

“…Spatial isolation is any technique to spatially orthogonalize the selfinterference and the signal-of-interest. Some spatial isolation techniques studied in the literature are multi-antenna beamforming [1,[15][16][17][18][19], directional antennas [20], shielding via absorptive materials [21], and cross-polarization of transmit and receive antennas [10,21]. The key differentiator between cancellation and spatial isolation is that cancellation requires and exploits knowledge of the self-interference, while spatial isolation does not.…”

Section: Introductionmentioning

confidence: 99%

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Spatial degrees-of-freedom in large-array full-duplex: the impact of backscattering

Everett

Sabharwal

2016

J Wireless Com Network

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The key challenge for in-band full-duplex wireless communication is managing self-interference. Many designs have employed spatial isolation mechanisms, such as shielding or multi-antenna beamforming, to isolate the self-interference waveform from the receiver. Because such spatial isolation methods confine the transmit and receive signals to a subset of the available space, the full spatial resources of the channel may be under-utilized, expending a cost that may nullify the net benefit of operating in full-duplex mode. In this paper, we leverage an antenna-theory-based channel model to analyze the spatial degrees of freedom available to a full-duplex capable base station. We observe that whether or not spatial isolation out-performs time-division (i.e., half-duplex) depends heavily on the geometric distribution of scatterers. Unless the angular spread of the objects that scatter to the intended users is overlapped by the spread of objects that backscatter to the base station, then spatial isolation outperforms time division, otherwise time division may be optimal.

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“…where the terms d T 2 , δ T 2 d R 1 , and δ R 1 are given in (17)(18)(19)(20) within the table at the bottom of the page.…”

Section: Lemma 2 the Spatial Degree-of-freedom Tuplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spatial degrees-of-freedom in large-array full-duplex: the impact of backscattering

Everett

Sabharwal

2016

J Wireless Com Network

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“…For example, a single antenna was used to support IBFD WiFi radio by [1], where both analog and digital self-interference cancelation techniques were used. Various techniques have been proposed to reduce self-interference, which are related to advances in IBFD wireless communication in the physical layer [2,4,[8][9][10][11].…”

Section: Related Workmentioning

confidence: 99%

In-band full-duplex medium access control design for heterogeneous wireless LAN

Alim

Kobayashi

Saruwatari

et al. 2017

J Wireless Com Network

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Full-duplex (FD) wireless communication is evolving into a practical technique, and many studies are being conducting in this area, especially regarding the physical layer. However, to exploit FD benefit successfully, efficient medium access control (MAC) protocols are crucial as well as physical layer advances. Numerous FD-MAC protocols have been proposed, but these MAC protocols cannot address all the issues encountered in this area. In addition, many half-duplex (HD) capable devices are present in existing wireless local area networks (WLANs), so there is an urgent need to integrate FD clients and HD clients in the same WLAN. We refer to this type of WLAN as a heterogeneous WLAN (Het-WLAN). In this paper, we propose an FD-MAC for Het-WLAN, which considers all possible types of FD transmissions. Our proposed FD-MAC protocol suppresses inter-user interference. Simulation results demonstrated that a significant throughput gain (about 96%) could be achieved by using our proposed FD-MAC compared with traditional HD communications. Moreover, our proposed MAC obtained better performance (average throughput gain of about 11%) compared with another existing FD-MAC design. In addition, probability analysis suggested that the total probability of FD transmissions increased rapidly as the WLAN approached saturation conditions.

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“…For half-duplex relaying, we let , where ; then, . Under the block-fading assumption, the LMGFs for the service processes of links and as functions of are given by [6] 2 (15) and as a result (16) where we have defined (17) With these formulations for , , and , we can now more explicitly express the equations in (9) and (12) as (18) 2 Due to the assumption that the fading changes independently from one block to another, we can, for instance, simplify (4) as . If fading is correlated, such simplifications are in general not possible and analysis needs to be based on the limit forms of the asymptotic LMGFs.…”

Section: Effective Capacity Of a Two-hop Link In Block-fading Chmentioning

confidence: 99%

Effective Capacity of Two-Hop Wireless Communication Systems

Qiao

Gursoy

Velipasalar

2013

IEEE Trans. Inform. Theory

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Abstract-A two-hop wireless communication link in which a source sends data to a destination with the aid of an intermediate relay node is studied. It is assumed that there is no direct link between the source and the destination, and the relay forwards the information to the destination by employing the decode-and-forward scheme. Both the source and intermediate relay nodes are assumed to operate under statistical quality of service (QoS) constraints imposed as limitations on the buffer overflow probabilities. The maximum constant arrival rates that can be supported by this two-hop link in the presence of QoS constraints are characterized by determining the effective capacity of such links as a function of the QoS parameters and signal-to-noise ratios at the source and relay, and the fading distributions of the links. The analysis is performed for both full-duplex and half-duplex relaying. Through this study, the impact upon the throughput of having buffer constraints at the source and intermediate relay nodes is identified. The interactions between the buffer constraints in different nodes and how they affect the performance are studied. The optimal time-sharing parameter in half-duplex relaying is determined, and performance with half-duplex relaying is investigated.Index Terms-Buffer violation probability, effective capacity, fading channels, full-duplex and half-duplex relaying, quality of service (QoS) constraints, two-hop wireless links.

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Empowering full-duplex wireless communication by exploiting directional diversity

Cited by 204 publications

References 4 publications

Spatial degrees-of-freedom in large-array full-duplex: the impact of backscattering

Spatial degrees-of-freedom in large-array full-duplex: the impact of backscattering

In-band full-duplex medium access control design for heterogeneous wireless LAN

Effective Capacity of Two-Hop Wireless Communication Systems

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