Abstract
Time transmission interval (TTI) or outer block interleaving is an important task for the implementation of UMTS turbo coding in flat Rayleigh fading environment. An efficient TTI choice can save computational complexity. However, different multimedia scenarios are investigated using the maximum UMTS frame length, and simulation results are presented for the four possible outer block interleaver configurations in the case of flat Rayleigh fading channel. It is shown that different operating environments require an appropriate TTI in terms of bit error rate (BER) performance for the following data rates: 28.8 kbps, 64 kbps, 144 kbps, 384 kbps, and 2 Mbps.
Highlights
Turbo coding [1] offers energy efficiencies close to the limits predicted by information theory with features that include parallel code concatenation, recursive convolutional encoding, interleaving, and an iterative decoding algorithm; while in fading environments, outer block interleaving should be used
Soft-input/soft-output (SISO) decoder is the significant part of a turbo decoder: the concept of iterative decoding relies on the use of SISO decoders which calculate the a posteriori probabilities based on the received channel sequences and a priori information
Similar to the approach described in [16], but for turbo codes, in this paper, we discuss the effect of outer block interleaving on Universal Mobile Telecommunications System (UMTS) turbo codes performance for a constant frame length, log maximum a posteriori (log-MAP) algorithm for turbo decoder, five different bit rates, and different operating environments
Summary
Turbo coding [1] offers energy efficiencies close to the limits predicted by information theory with features that include parallel code concatenation, recursive convolutional encoding, interleaving, and an iterative decoding algorithm; while in fading environments, outer block interleaving should be used. Turbo codes have been adopted as a channel coding scheme in UMTS for data rates higher than or equal to 28.8 kbps [8, 9]. The rest of the paper is organised as follows: Section 2 presents a short literature review on the area together with a brief description of UMTS data stream.
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