Title :
A New Spreading Matrix for Block Spread OFDM
Author :
Raad, Ibrahim S. ; Huang, Xiaojing ; Raad, Raad
Author_Institution :
Sch. of Electr., Comput. & Telecommun. Eng., Wollongong Univ., NSW
Abstract :
This paper presents a new spreading matrix for block spread OFDM (BSOFDM) to improve the performance of the system by increasing the correlation between the symbols. This is achieved by rotating the modulation scheme used at the transmission, say QPSK, into a higher order modulation scheme, for example 16QAM. By this the correlation between the transmitted symbols is increased. The advantage of this new spreading matrix over more traditional spreading matrices is its flexibility in achieving different higher order modulation schemes during transmission depending on the angle alpha. This is compared to other spreading matrices in frequency selective channel environment
Keywords :
OFDM modulation; block codes; correlation theory; matrix algebra; quadrature phase shift keying; BSOFDM; QPSK; block spread OFDM; correlation; higher order modulation scheme; orthogonal frequency division multiplexing; quadrature phase shift keying; spreading matrix; Australia; Binary phase shift keying; Bit error rate; Decision feedback equalizers; Fading; OFDM modulation; Quadrature phase shift keying; Signal to noise ratio; System testing; Telecommunication computing; BSOFDM; Frequency selective channel; Spreading matrix;
Conference_Titel :
Communication systems, 2006. ICCS 2006. 10th IEEE Singapore International Conference on
Conference_Location :
Singapore
Print_ISBN :
1-4244-0411-8
Electronic_ISBN :
1-4244-0411-8
DOI :
10.1109/ICCS.2006.301471
