Successive AoA estimation: Revealing the second path for 60 GHz communication system

Abstract

60 GHz communication system is a viable candidate to support very high data throughput for wireless communication. To compensate for high path loss at 60 GHz frequency, a large number of antenna elements are employed to form highly directional beams for communication range extension. However, communication paths are easily be blocked by human movement. Switching to the second best path when needed is to protect against human blockage.Before switching to the second best path, the device needs to know a list of available alternative paths. Acquiring the list is related to Angle of Arrival (AoA) estimation problem. Though many high resolution AoA estimation algorithms are proposed in the literature, the unique features in the 60 GHz system require special attentions. We propose successive AoA estimation algorithm to utilize the features in the system. The scheme borrows the concept from successive interference cancellation scheme in multiuser detection. It provides compelling performance if there are large signal strength disparities among users, which is also observed in AoA estimation for 60 GHz system. The proposed scheme is very efficient as the AoA estimation step during each iteration is shown to be convex. Numerical results demonstrate that the proposed scheme outperforms other schemes and is shown to be a good candidate to reveal the alternative paths for the 60 GHz system.

Channel Estimation and Hybrid Precoding for Millimeter Wave Cellular Systems

“…The design of a multi-resolution or variant beamwidth beamforming vector codebook has been studied before in [7]- [9], [20], [21]. This prior work focused on analog-only beamforming vectors, and on the physical design of the beam patterns.…”

“…3 is designed such that it has a constant projection on the array response vectors a BS φ u , u is in {0, 1, ..., 63}, i.e.,φ u is in 0, ..., 2π 63 256 , and zero projection on the other directions. In a more compact form, we can write the design objective of the beamforming vectors F (s,k) in (20) as the solution of…”

“…Hence, following [13], we develop an orthogonal matching pursuit algorithm to iteratively solve this problem as shown in Algorithm 1. Also, note that the constant C s is not known a priori, and should be ideally maximized as it is proportional to the beamforming gain as indicated in (20). However, and for the sake of a low-complexity solution, we will assume that it is a constant, and calculate its value after the design of the beamforming vectors to normalize them as shown in Algorithm 1.…”

60 GHz MAC standardization: Progress and way forward

“…In order to ensure reliable frame transmissions, IEEE 802. 15.3c provides three acknowledgment mechanisms, namely, ImmAck, BlockACk and DelayACK. It also supports NoACK mode when acknowledgment is not sought after frame transmission.…”

“…ECMA-387 and IEEE 802. 15.3c have not received much attention in terms of commercialization. However, IEEE 802.11ad is gaining the momentum recently in terms of product realization due to its backward compatibility with popular IEEE 802.11x protocols.…”