On the capacity of a class of dual-band interference channels

Majhi, Subhajit; Mitran, Patrick

doi:10.1109/isit.2016.7541801

Cited by 2 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We observe that the ASR matches the OB if d SR ≤ d * SR with d * SR ≈ 1.41 for d RD = 1, and d * SR ≈ 0.91 for d RD = 0.5, otherwise the ASR is strictly smaller. As d RD reduces from 1 to 0.5, for condition (13) to hold, d * SR also reduces from d * SR ≈ 1.41 to ≈ 0.91. Next, to illustrate the impact of the mm-wave links, in Fig.…”

Section: Capacity Of a Class Of R-marcmentioning

confidence: 98%

“…We take both bands in the R-MARC to be under phase fading as in [24]. Hence, expectations in conditions (11)- (13) and Theorem 2 are not needed, and observations can be interpreted in terms of distances. Also, power constraints in the R-MARC are set to 10 and β 1 = 2, β 2 = 4.…”

Section: Capacity Of a Class Of R-marcmentioning

confidence: 99%

“…However, few studies have been reported on the information-theoretic limits of multi-user dual-band networks [21], which are crucial in identifying the limits of achievable rates, simplified encoding schemes, etc., in practical dual-band networks. For example, the study on the two-user interference channel over such integrated dual-bands [13] has shown that forwarding interference to the non-designated receivers through the mm-wave links can improve achievable rates considerably. Moreover, relay cooperation, which already plays a key role in microwave networks, will likely play a vital role in such dual-band networks as well, especially to offset impairments such as blockage in the mm-wave band [8], [12], [22], [23].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dual-Band Fading Multiple Access Relay Channels

Majhi

Mitran

2019

IEEE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

Relay cooperation and integrated microwave and millimeter-wave (mm-wave) dual-band communication are likely to play key roles in 5G. In this paper, we study a two-user uplink scenario in such dual-bands, modeled as a multiple-access relay channel (MARC), where two sources communicate to a destination assisted by a relay.However, unlike the microwave band, transmitters in the mm-wave band must employ highly directional antenna arrays to combat the ill effects of severe path-loss and small wavelength. The resulting mm-wave links are pointto-point and highly directional, and are thus used to complement the microwave band by transmitting to a specific receiver. For such MARCs, the capacity is partially characterized for sources that are near the relay in a joint sense over both bands. We then study the impact of the mm-wave spectrum on the performance of such MARCs by characterizing the transmit power allocation scheme for phase faded mm-wave links that maximizes the sum-rate under a total power budget. The resulting scheme adapts the link transmission powers to channel conditions by transmitting in different modes, and all such modes and corresponding conditions are characterized. Finally, we study the properties of the optimal link powers and derive practical insights. Index TermsFading multiple-access relay channel, Dual-band communication, Millimeter-wave band.Transmission in the mm-wave band differs from that in the conventional microwave band in that omnidirectional mm-wave transmission suffers from much higher power loss and absorption. Thus, a transmitter must use beamforming via highly directional antenna arrays to reach a receiver [6]. Due to the small wavelength at mm-wave frequencies and large path loss, beamforming typically creates links that have a strong line-of-sight (LoS) component and only a few, if any, weak multi-path components. Such mm-wave links are inherently point-to-point, and are well modeled as AWGN links [7]- [9]. Although mmwave links support high data rates due to their large bandwidths, they provide limited coverage, whereas microwave links typically provide reliable coverage and support only moderate data rates. Thus, in a dualband setting, these two bands mutually complement each other: conventional traffic and control information can be reliably communicated in the microwave band, and high data-rate traffic can be communicated via the mm-wave links [3]-[5], [10]-[15].In future 5G networks, access via dual microwave and mm-wave bands will likely be a key technology, and hence they have been subject to much investigation recently. For example, studies as in [10]-[12],[14] focus on improving network layer metrics such as the number of served users, throughput, and link reliability, etc., while studies as in [16]-[18] focus on improving physical layer metrics such as the achievable rates and outage probability. Moreover, the emergence of dual-band modems from Intel [19] and Qualcomm [20], and practical demonstrations such as that in the 3 GHz-30 GHz dual-bands in [4] clearly illustrate...

show abstract

Section: Capacity Of a Class Of R-marcmentioning

confidence: 98%

Section: Capacity Of a Class Of R-marcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dual-Band Fading Multiple Access Relay Channels

Majhi

Mitran

2019

IEEE Trans. Commun.

Self Cite

View full text Add to dashboard Cite

show abstract

“…For a fixed power allocation (p 1 , q 1 , p 2 , q 2 ) in the mm-wave channels, we denote the sum-rate achievable at Rx 1 and Rx 2 in (14) and (15) by Σ 1 and Σ 2 , and the interference-free sum-rate given by the sum of individual rates in (12) and (13) by Σ, and present them below…”

Section: Problem Formulation and Solutionmentioning

confidence: 99%

“…In contrast, microwave links are much more reliable due to rich scattering and diffraction, but cannot support as high rates as the mm-wave links. Thus, in a dual-band setting, conventional traffic and control information can be reliably communicated over microwave links, and high data-rate traffic can be sent through mm-wave links [2,7,[9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

On the Capacity and the Optimal Sum-Rate of a Class of Dual-Band Interference Channels

Majhi

Mitran

2017

Entropy

Self Cite

View full text Add to dashboard Cite

Abstract:We study a class of two-transmitter two-receiver dual-band Gaussian interference channels (GIC) which operates over the conventional microwave and the unconventional millimeter-wave (mm-wave) bands. This study is motivated by future 5G networks where additional spectrum in the mm-wave band complements transmission in the incumbent microwave band. The mm-wave band has a key modeling feature: due to severe path loss and relatively small wavelength, a transmitter must employ highly directional antenna arrays to reach its desired receiver. This feature causes the mm-wave channels to become highly directional, and thus can be used by a transmitter to transmit to its designated receiver or the other receiver. We consider two classes of such channels, where the underlying GIC in the microwave band has weak and strong interference, and obtain sufficient channel conditions under which the capacity is characterized. Moreover, we assess the impact of the additional mm-wave band spectrum on the performance, by characterizing the transmit power allocation for the direct and cross channels that maximizes the sum-rate of this dual-band channel. The solution reveals conditions under which different power allocations, such as allocating the power budget only to direct or only to cross channels, or sharing it among them, becomes optimal.

show abstract

On the capacity of a class of dual-band interference channels

Cited by 2 publications

References 12 publications

Dual-Band Fading Multiple Access Relay Channels

Dual-Band Fading Multiple Access Relay Channels

On the Capacity and the Optimal Sum-Rate of a Class of Dual-Band Interference Channels

Contact Info

Product

Resources

About