Power Allocation in MMSE Relaying over Frequency-Selective Rayleigh Fading Channels

Abstract--This paper develops an amplify-and-forward relaying scheme for multiuser wireless cooperative networks under frequency-selective block-fading. Single-carrier frequency division multiple-access with frequency-domain equalization technique is employed at both the relay and destination to combat the inter-block and inter-symbol interference caused by multipath propagation. With the assumption that the full channel state information (CSI) is available at the destination, the relay only knows the uplink channels while no CSI is available at the sources, two power allocation schemes are developed for the relay: (i) to minimize the total transmit power at the relay while maintaining the signal-to-interference-plus-noise ratio (SINR) for each user at the destination above a certain level, and (ii) to maximize the worst SINR among all the users subject to a constraint on total relay power. In the first problem, it is shown that SINR adaptation is needed not only to guarantee a feasibl...

• Type: Journal
• Year: 2010
• Where: TCOM
• Authors: Tung T. Pham, Ha H. Nguyen, Hoang Duong Tuan
• Keywords: Channel Conditions, Relay, Software Engineering, TCOM 2010, Transmit Power