Blind Channel Estimation Based on the Lloyd-Max Algorithm in Narrowband Fading Channels and Partial-Band Jamming

Date

2012-07-01

Author

Dizdar, Onur
Yılmaz, Ali Özgür

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

130
views

0
downloads

In wireless communications, knowledge of the channel coefficients is required for coherent demodulation. In this work, a blind channel estimation method based on the Lloyd-Max algorithm is proposed for single-tap fading channels. The algorithm estimates the constellation points for the received signal using the Lloyd-Max algorithm. The algorithm is investigated for frequency hopping systems with small hop durations and operating under partial-band jamming for both detecting the jammer and estimating the channel. The performance of the Lloyd-Max channel estimation algorithm is compared to the performance of pilot-based channel estimation algorithms and non-coherent demodulation and decoding. A special concatenated channel code is constructed to work with the proposed blind channel estimation due to the phase ambiguity in estimates.

Subject Keywords

Blind channel estimation, Jammer detection, Jamming, Narrowband, Lloyd-Max, Fading

URI

https://hdl.handle.net/11511/37314

Journal

IEEE TRANSACTIONS ON COMMUNICATIONS

DOI

https://doi.org/10.1109/tcomm.2012.051712.110523

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

Blind channel estimation based on the Lloyd-Max algorithm innarrowband fading channels and jamming Dizdar, Onur; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2011) In wireless communications, knowledge of the channel coefficients is required for coherent demodulation. In this thesis, a blind channel estimation method based on the Lloyd-Max algorithm is proposed for single-tap fading channels. The algorithm estimates the constellation points for the received signal using an iterative least squares approach. The algorithm is investigated for fast-frequency hopping systems with small block lengths and operating under partial-band and partial-time jamming for both detecti...
Wideband Channel Estimation With a Generative Adversarial Network Balevi, Eren; Andrews, Jeffrey G. (2021-05-01) Communication at high carrier frequencies such as millimeter wave (mmWave) and terahertz (THz) requires channel estimation for very large bandwidths at low SNR. Hence, allocating an orthogonal pilot tone for each coherence bandwidth leads to excessive number of pilots. We leverage generative adversarial networks (GANs) to accurately estimate frequency selective channels with few pilots at low SNR. The proposed estimator first learns to produce channel samples from the true but unknown channel distribution v...
Discrete Relay Beamforming for Broadcasting with Relay Selection Demir, Özlem Tuğfe; Tuncer, Temel Engin (2015-05-19) In this paper, broadcast beamforming problem is considered in relay-assisted wireless networks. Two-phase relay communication is adopted. In the first phase, a source transmits common information to multiple relays which use amplify-and-forward relay protocol. Each relay multiplies its received signal by a complex weight and transmits it to the receivers. The amplitudes and phases of complex relay weights are chosen from discrete sets in order to decrease overhead for the feedback channel. Relay selection i...
Downlink MU-MIMO With QoS Aware Transmission: Precoder Design and Performance Analysis Yalcin, Ahmet Zahid; Yüksel Turgut, Ayşe Melda; Bahceci, Israfil (2019-02-01) In this paper, a downlink wireless communication channel is considered. The base station (BS) has common data for all users, unicast data for a set of intended users, and transmits the superposition of these messages. This setting neither falls into the non-orthogonal multiple access (NOMA) nor into the multi-group multicasting literatures. In NOMA systems, the BS has unicast data for all users, and multiple users share the same resources. In multi-group multicasting, there are non-overlapping groups, each ...
Blind Communications Sytem Structures For SIMO Channels Karakuetuek, Serkan; Tuncer, Temel Engin (2008-04-22) Frame based single input multi output (SIMO) communications systems are considered. In these systems frame length, offset, channel order and channel coefficients are all unknowns and there is no training session. Different system structures are considered for the estimation these unknowns blindly and best system structure is found. In addition a new method for channel order estimation is proposed.

Citation Formats

O. Dizdar and A. Ö. Yılmaz, “Blind Channel Estimation Based on the Lloyd-Max Algorithm in Narrowband Fading Channels and Partial-Band Jamming,” IEEE TRANSACTIONS ON COMMUNICATIONS, pp. 1986–1995, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37314.