Hierarchical constellation for multi-resolution data transmission over block fading channels

• Published in: 2004 IEEE International Conference on Communications (IEEE Cat. No.04CH37577) Vol. 5; pp. 3101 - 3105 Vol.5
• Main Authors: Hossain, Md.J., Alouini, M.-S., Bhargava, V.K.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway, New Jersey IEEE 2004
• Subjects: Adaptive scheduling; Applied sciences; Conferences; Constellation diagram; Data communication; Dynamic scheduling; Exact sciences and technology; Fading; Information, signal and communications theory; Modulation, demodulation; Propagation losses; Protocols; Quadrature amplitude modulation; Signal and communications theory; Signal resolution; Switching and signalling; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; Transmission and modulation (techniques and equipments); Fading channels; Packet switching; Image resolution; Quadrature amplitude modulation; Video signal; Transmission channel; Information rate; Loss rate; Data transmission; Scheduling; Adaptive method; Information transmission; Multiresolution analysis; Hierarchized structure; Multiple image; Image quality; Nakagami fading; First order; Transmission rate; Error correction; Hierarchical system; Transmission loss
• ISBN: 0780385330; 9780780385337
• DOI: 10.1109/ICC.2004.1313102

We propose a new technique for multi-resolution video/image data transmission over block fading channels. The proposed scheme uses an adaptive scheduling protocol employing a retransmission strategy in conjunction with a hierarchical signal constellation (known also as nonuniform, asymmetric, multi-resolution constellation) to give different transmission priorities to different resolution levels. Transmission priorities are given in terms of packet loss rate as well as average throughput i.e., transmission rate. Basically, according to the transmission scheduling and channel state (acknowledgment signal) of the previous transmission, it dynamically selects packets from different resolution levels to transmit for the current transmission. The bits from the selected packets are assigned to different hierarchies of a hierarchical 4/16- quadrature amplitude modulation to transmit them with different error protections. The selection of packets for transmission and the assignment of these selected packets to different hierarchies of the hierarchical constellation are referred to as the scheduling protocol in our proposed scheme. We model this protocol by a finite state first order Markov chain and obtain the packet loss rate and the packet transmission rate over Nakagami-m block fading channel in closed-form. Some selected numerical results show that the proposed scheme can control the relative packet loss rate and the packet transmission rate of different resolution levels by varying the priority parameter (or equivalently the asymmetry) of the hierarchical constellation and the maximum number of allowed retransmissions.