On the capacity of Rayleigh fading cooperative systems under adaptive transmission

Abstract

In this letter, the use of adaptive source transmission with amplify-and-forward relaying is proposed. Three different adaptive techniques are considered: (i) optimal simultaneous power and rate adaptation; (ii) constant power with optimal rate adaptation; (iii) channel inversion with fixed rate. The capacity upper bounds of these adaptive protocols are derived for the amplify-and-forward cooperative system over both independent and identically distributed (i.i.d.) Rayleigh fading and non-i.i.d. Rayleigh fading environments. The capacity analysis is based on an upper bound on the effective received signal-to-noise ratio (SNR). The tightness of the upper bound is validated by the use of a lower bound and by Monte Carlo simulation. It isshown that at high SNR the optimal simultaneous power and rate adaptation and the optimal rate adaptation with constant power provide roughly the same capacity. Channel inversion is shown to suffer from a deterioration in capacity relative to the other adaptive techniques.

Low complexity adaptive transmission scheme for cooperative networks with decode-and-forward relay

“…Furthermore, [8] analyzed adaptive modulation method for incremental relaying system. In [9], variable-rate transmission of a cooperative system with AF fixed relay (AFFR) for Rayleigh fading has been considered.…”

Capacity analysis of a decode-and-forward cooperative network under adaptive transmission

“…The performance of a single relay cooperative network with adaptive modulation was studied in [6] where the author considered both amplify-and-forward (AF) and decode-andforward (DF) relays in a Rayleigh fading wireless environment to obtain capacity expressions under three adaptive transmission schemes: (i) optimal simultaneous power and rate adaptation (OPRA) (ii) constant power with optimal rate adaptation (ORA) (iii) truncated channel inversion with fixed rate (TIFR). The recent work of Nechiporenko et al [7] has extended work of [6] to an N ≥ 1 AF relay network. In [8] Nechiporenko et al extended [7] by considering optimum switching thresholds for adaptive modulation.…”

“…The recent work of Nechiporenko et al [7] has extended work of [6] to an N ≥ 1 AF relay network. In [8] Nechiporenko et al extended [7] by considering optimum switching thresholds for adaptive modulation.…”

“…The effect of a decoding threshold in DF relays on the achievable channel capacity is also analyzed. Our work is an extension of the previous work of [6], [7]. In [6] the direct path between source and destination is not considered and in [7] only the performance of AF relays, but not DF relays, were investigated.…”

Ergodic capacity of cooperative networks using adaptive transmission and selection combining

“…al. in [12] in which the capacity of Rayleigh fading for repetition-based cooperative networks employing maximal ratio combining (MRC) at the destination under three adaptive policies: optimal simultaneous power and rate adaptation, constant power with optimal rate adaptation and channel inversion with fixed rate is provided.…”