Auxiliary beam pair design in mmWave cellular systems with hybrid precoding and limited feedback

Zhu, Dalin; Choi, Junil; Heath, Robert W.

doi:10.1109/icassp.2016.7472306

Cited by 13 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Fig. 9, we compare the receive SNR at the third vehicle based on the proposed algorithm and two benchmark algo- rithms, i.e., the feedback-based method and the auxiliary beam pairing (ABP) approach in [43], to verify the effectiveness of the proposed prediction-based beam alignment scheme. The number of transmit antenna is N t = 64 and the transmit SNR is normalized to 0 dB to emphasize the SNR gain.…”

Section: Simulation Resultsmentioning

confidence: 99%

Integrated Sensing and Communication-assisted Orthogonal Time Frequency Space Transmission for Vehicular Networks

Yuan,

Wei,

et al. 2021

Preprint

View full text Add to dashboard Cite

Orthogonal time frequency space (OTFS) modulation is a promising candidate for supporting reliable information transmission in high-mobility vehicular networks. In this paper, we consider the employment of the integrated (radar) sensing and communication (ISAC) technique for assisting OTFS transmission in both uplink and downlink vehicular communication systems. Benefiting from the OTFS-ISAC signals, the roadside unit (RSU) is capable of simultaneously transmitting downlink information to the vehicles and estimating the sensing parameters of vehicles, e.g., locations and speeds, based on the reflected echoes. Then, relying on the estimated kinematic parameters of vehicles, the RSU can construct the topology of the vehicular network that enables the prediction of the vehicle states in the following time instant. Consequently, the RSU can effectively formulate the transmit downlink beamformers according to the predicted parameters to counteract the channel adversity such that the vehicles can directly detect the information without the need of performing channel estimation. As for the uplink transmission, the RSU can infer the delays and Dopplers associated with different channel paths based on the aforementioned dynamic topology of the vehicular network. Thus, inserting guard space as in conventional methods are not needed for uplink channel estimation which removes the required training overhead. Finally, an efficient uplink detector is proposed by taking into account the channel estimation uncertainty. Through numerical simulations, we demonstrate the benefits of the proposed ISAC-assisted OTFS transmission scheme.

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Integrated Sensing and Communication-assisted Orthogonal Time Frequency Space Transmission for Vehicular Networks

Yuan,

Wei,

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Parts of this work have been presented at IEEE ICASSP 2016 [1]. This research was partially supported by the U.S. Department of Transportation through the Data-Supported Transportation Operations and Planning (D-STOP) Tier 1 University Transportation Center, and by a gift from Huawei Technologies.…”

Section: Introductionmentioning

confidence: 99%

“…By comparing the relative amplitude of the pulse in the pair of two beams, the direction of the object can be determined with accuracy dependent on the received signal-tonoise ratio (SNR). In our previous work [1], the idea of beam pair design was exploited to estimate mmWave communications channels. The proposed approach, however, can only estimate the AoD of a single-path channel assuming omni-directional receive antenna.…”

Section: Introductionmentioning

confidence: 99%

Auxiliary Beam Pair Enabled AoD and AoA Estimation in mmWave FD-MIMO Systems

Zhu

Choi

Heath

2016

2016 IEEE Global Communications Conference (GLOBECOM)

Self Cite

View full text Add to dashboard Cite

Channel estimation is of critical importance in millimeter-wave (mmWave) multiple-input multipleoutput (MIMO) systems. Due to the use of large antenna arrays, low-complexity mmWave specific channel estimation algorithms are required. In this paper, an auxiliary beam pair design is proposed to provide high-resolution estimates of the channel's angle-of-departure (AoD) and angle-of-arrival (AoA) for mmWave MIMO systems. By performing an amplitude comparison with respect to each auxiliary beam pair, a set of ratio measures that characterize the channel's AoD and AoA are obtained by the receiver. Either the best ratio measure or the estimated AoD is quantized and fed back to the transmitter via a feedback channel. The proposed technique can be incorporated into control channel design to minimize initial access delay. Though the design principles are derived assuming a high-power regime, evaluation under more realistic assumption shows that by employing the proposed method, good angle estimation performance is achieved under various signal-to-noise ratio levels and channel conditions. were also investigated in [22], [23], though these two papers mainly focused on the hierarchical beam codebook design. Only quantized angle estimation with limited resolution can be achieved via the compressed sensing [13]-[19] and grid-of-beams [21]-[23] based methods. With a small codebook, the resolution of angle estimation becomes low. Many high resolution subspace based angle estimation algorithms such as MUSIC [24], ESPRIT [25] and their variants [26] have been of great research interest to the array processing community for decades. Their applications to massive MIMO or full-dimension MIMO to estimate the two-dimensional angles were extensively investigated in [27]-[31]. For the mmWave frequency band, the MUSIC algorithm was employed for initial user discovery in [32] by exploiting mmWave channels' sparsity via directional beamforming. A relatively large number of snap-shots (samples) are required in the subspace based angle estimation algorithms employed in [27]-[32] to obtain accurate received signal covariance matrix, which in turn, results in high training overhead. Further, it is difficult to directly extend the MUSIC and ESPRIT-typeestimators to mmWave systems with the hybrid architecture. This is because with the hybrid architecture, only a reduced-dimension channel matrix can be accessed through the lens of a limited number of RF chains, which makes the estimation of the full MIMO channel difficult.In this paper, we develop an algorithm for estimating the channel's AoD and AoA through auxiliary beam pair (ABP) design with high accuracy and low training overhead. Pairs of beams were previously employed in monopulse radar systems to improve the estimation accuracy of the direction of arrival [33]- [37]. In amplitude monopulse radar, a sum beam and a difference beam form a pair such that the difference beam steers a null at the boresight angle of the sum beam. By comparing the relative amplitude of the pulse in the pair of tw...

show abstract