Quasi-Orthogonal Space-Time-Frequency Trellis Codes for Two Transmit Antennas

Review of Space-time Coded Orthogonal Frequency Division Multiplexing Systems for Wireless Communication

“…In [81] and [82], the extended SOSTTC was proposed based on constellation rotation over frequency selective fading channel with OFDM signal where the effect of delay spread, normalized Doppler frequency was investigated while in our work in [83] we extended the SQOSTTC from [84] over frequency selective fading Downloaded by [University of Chicago Library] at 09:29 21 November 2014 channel for four transmit antennas. Recently, in [85], differential quassi-orthogonal space-frequency trellis codes OFDM was investigated by combining unitary quasi-orthogonal trellis codes and differential modulation over the frequency and time domain.…”

Space-time code diversity by phase rotation in multi-carrier multi-user systems

“…In many of the algebraic constructions of space-time codes, such as golden code [15], silver codes [16], or many others [17][18][19], an important feature is the exchangeability of the structure (correlation) of the transmitter with the structure of the receiver. By using this correlation, Equation 1 can be rewritten as…”

Quasi-Orthogonal Space-Time-Frequency Trellis Codes for Mimo-OFDM Systems

“…In this section, Discuss the design criteria for the proposed Quasi-Orthogonal Space-Time-Frequency Trellis codes (QOSTFTCs) according to the criteria derived in [18], [17] with appropriate adjustment. Let Z be the frame length and C z be the branch output at the z th coding step of the trellis encoder.…”

“…To maximize the coding gain the distance criterion derived in [18] can be rewritten as the maximization of the minimum product of the coding gain distance ‫ܦܩܥ‬ = detሺ∑ ‫ۯ‬ ௭ ‫ܢ‬ ሻ and the modified product distance ‫ܦܲܯ‬ = ∏ ሺ1 + ‖۲ ௭ ‖ ி ଶ ሻ ௭ , ‫ݓ‬here z ϵ ߩ൫۱, ۳൯ as given in [17].…”

“…There has been no previous work on QOSTF trellis codes for four transmit antennas with parallel transitions in the trellis structure, such that both the multipath diversity and coding gain can be achieved despite parallel transitions. Furthermore, the QOSTF trellis schemes proposed in this letter are based on the design criteria derived in [18], [17] with appropriate arrangements. Although the code from [17] exploits the multipath diversity and transmit diversity gains available in the MIMO-OFDM channel, it does not provide additional coding gain, array gain and receive diversity as our proposed code do for four transmit and two receive antennas.…”