Title :
A new differential space-time block coding scheme
Author :
Shao, Xun ; Yuan, Jinhong
Author_Institution :
New South Wales Univ., Sydney, NSW, Australia
Abstract :
Most existing space-time coding schemes rely heavily on accurate channel estimation at the receiver., which is a difficult task in rapidly fading environment. The previous Tarokh and Jafarkhani (see IEEE Journal on Selected Areas in Comm., vol.18, no.7, p.1169-1174, 2000) differential space-time block code (DSTBC) suffers from the signal constellation expansion for QPSK and 8PSK modulation. We present a new differential space-time block coding scheme without constellation expansion. This is achieved by choosing differential coefficients appropriately in the signal mapping. The new scheme can be decoded by a Viterbi decoder. More importantly, it provides a differential coding gain of 1 dB-1.5 dB due to the redundancy introduced in the differential coding and it is only 2 dB away from the coherent space-time block codes.
Keywords :
Viterbi decoding; block codes; channel estimation; quadrature phase shift keying; space-time codes; 8PSK; QPSK; Viterbi decoder; channel estimation; coherent space-time block codes; differential coding gain; differential coefficients; differential space-time block code; differential space-time block coding; fading environment; receiver; redundancy; signal mapping; Block codes; Constellation diagram; Decoding; Fading; Modulation coding; Quadrature phase shift keying; Receiving antennas; Signal mapping; Transmitting antennas; Viterbi algorithm;
Conference_Titel :
Communication Systems, 2002. ICCS 2002. The 8th International Conference on
Print_ISBN :
0-7803-7510-6
DOI :
10.1109/ICCS.2002.1182462