Advanced channel coding for HAP-based broadband services

A. Boch

doi:10.1109/MAES.2007.4350274

2007-09-01

PRE

A. Boch *

Massamiliano Laddomada

M. Mondin

DOI：10.1109/MAES.2007.4350274

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摘要

En 中文

Broadband communications from High Altitude Platforms (HAPs) have recently garnered interest in the scientific community. Many European and US initiatives have aimed at addressing some of the core R&D issues associated with the use of HAPs for broadband communications. Within the European Commission's VI Framework program, the CAPANINA project has focused on communications from aerial platform networks delivering broadband communications for all. The main objective of the project is the study of a communication payload able to guarantee broadband services in excess of 120 Mbit/s from HAPs to high-speed trains, one of the most challenging scenarios as far as the ground motion is concerned. The HAP payload in CAPANINA is based on the physical layer of the IEEE 802.16 (WiMAX) standard. This focuses on the research efforts accomplished in the second phase of the project in relation to the design of alternative channel codes supporting a link with Quality of Service (QoS) provisions for the application at hand. The high channel coding gains required by the scenarios considered call for adaptive, bit-interleaved, variable length concatenated coding schemes. From a practical point of view, coding gains beyond that offered by the standard, allow for increase of the HAP coverage area, or alternatively, allow for a reduction of the transmitted power from the HAP while guaranteeing the same target performance. Both metrics, coverage, and transmit power, are fundamentally important in the overall system design. We present a framework for the design of variable-length, prunable interleavers needed for the design of both bit-interleaved coded modulations and for code concatenation. Simulation results confirm the effectiveness of this class of codes compared to two code fragments as proposed in the IEEE 802.16 standard.

Keyword:

HIGH-ALTITUDE PLATFORMS

CONCATENATED CONVOLUTIONAL-CODES

DESIGN