Title :
Bandwidth Efficient Cooperative Diversity Scheme Based on Constellation Rotation
Author :
Cao, Mingwei ; Bi, Guangguo
Author_Institution :
Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing
fDate :
6/30/1905 12:00:00 AM
Abstract :
A bandwidth efficient three-user cooperative diversity scheme is proposed. Each user has two partners who receive its symbols and rotate the phases of these symbols. Then, two partners retransmit the real parts and imaginary parts of these rotated symbols, respectively. This scheme can offer diversity order of three, and the bandwidth efficiency is only decreased by 1/2 compared to a noncooperative diversity scheme. The optimal rotation angles are derived when QPSK and 8PSK modulations are employed, respectively. Then, a new symbol mapping for 8PSK modulation is proposed, and it is a simple way to improve the system performance.
Keywords :
diversity reception; phase shift keying; quadrature phase shift keying; 8PSK modulation; QPSK modulation; bandwidth efficient three-user cooperative diversity scheme; constellation rotation; symbol mapping; Bandwidth; Bismuth; Cyclic redundancy check; Decoding; Fading; Quadrature phase shift keying; Receiving antennas; Relays; System performance; Transmitting antennas; Bandwidth efficiency; cooperative diversity; fading channels;
Journal_Title :
Signal Processing Letters, IEEE
DOI :
10.1109/LSP.2008.2007614
