Title :
Optimal precoder for amplify-and-forward half-duplex relay system
Author :
Ding, Yanwu ; Zhang, Jian-Kang ; Wong, Kon Max
Author_Institution :
Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, ON
fDate :
8/1/2008 12:00:00 AM
Abstract :
In this paper, an optimal unitary precoder is designed for an amplify-and-forward (AF) half-duplex relay system to obtain the maximum coding gain while the original ergodic channel capacity for the relay system is kept unchanged. A closed-form design is derived for quadrature amplitude modulation (QAM) signals by employing the properties of Farey sequence in number theory. Simulation results indicate that the proposed design greatly improves the bit error rate (BER) performance for the relay system.
Keywords :
channel capacity; error statistics; precoding; quadrature amplitude modulation; radio networks; BER; Farey sequence; QAM signals; amplify-and-forward half-duplex relay system; bit error rate; closed-form design; ergodic channel capacity; optimal unitary precoder; quadrature amplitude modulation; Bit error rate; Channel capacity; Decoding; Diversity methods; Pairwise error probability; Protocols; Quadrature amplitude modulation; Relays; Signal design; Wireless communication; Farey sequence; Relay system; amplify-and-forward (AF); diversity gain function; ergodic channel capacity; pairwise error probability; precoder;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2008.070226
