Abstract
In this paper, performance of space-time trellis-code (STTC), space-time block code (STBC), and space-time trellis-code concatenated with space-time block code (STTC-STBC) for multi-carrier code-division multiple-access (MC-CDMA) system are studied. These schemes are considered by employing different detection techniques with various multi input multi output (MIMO) antenna diversity for different number of states in multi-path fading channel. The corresponding bit error rate (BER) is obtained using simulation for minimum mean-square error (MMSE), maximum-ratio combining (MRC), and equal-gain combining (EGC) receivers employing Viterbi decoder. The simulation results show that the STTC-STBC MC-CDMA system perform better compared to other schemes considered in this paper using MMSE detection and it is also observed that the performance can also be enhanced by increasing diversity using more transmitter and receiver antennas. However, this improvement in performance comes at the cost of increased computational complexity, which is calculated for different transmitting and receiving antennas.
Highlights
Cellular services are being used every day by millions of people worldwide and the demand is increasing exponentially
The simulation results show that the space-time trellis-code (STTC)-space-time block code (STBC) multi-carrier code-division multiple-access (MC-CDMA) system perform better compared to other schemes considered in this paper using minimum mean-square error (MMSE) detection and it is observed that the performance can be enhanced by increasing diversity using more transmitter and receiver antennas
The simulation is done for STBC MC-CDMA systems, STTC MC-CDMA systems, and STTC-STBC MCCDMA systems for 4, 8, and 16 states with different combinations of diversity for K = 5 users
Summary
Cellular services are being used every day by millions of people worldwide and the demand is increasing exponentially. Space-time coding techniques may be employed in conjunction with the MC-CDMA system to achieve very high data rate [3,4]. The space-time trellis-code (STTC), space-time block code (STBC), and space-time trellis-code concatenated with space-time block code (STTC-STBC) techniques are studied and applied in multi-carrier codedivision multiple-access (MC-CDMA) systems. These techniques are considered with multi input multi output (MIMO) antenna diversity in multi-path fading channel.
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