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Orthogonal frequency-division multiplexing (OFDM) is used in third and fourth generation and is being planned for fifth-generation (5G) systems. OFDM requires that the received subcarriers be orthogonal. However, various factors, such as residual carrier frequency offset due to Doppler shift in mobile fading channels, can lead to a loss in orthogonality between subcarriers, which results in intersymbol...
This paper investigates a space time turbo trellis codes (ST Turbo TC). Increasing the number of receiver antennas from two to three gives a gain about 2 dB at the FER 10−. The number of transmit antennas grow from two to three which gives a gain about 3 dB at the FER 10−.nA bigger interleaver size yields a higher diversity which brings a weight symbol distribution. The ST turbo TC scheme is insensitive...
By integrating space-time coding technology into LAS spread spectrum technology, the code division multiple access system can take both of their advantage. When many antennas are installed on the base station, the wireless communication system is possible to get full spatial diversity gain. Both the transmitter scheme and the receiver scheme of such space-time spread spectrum CDMA system using multiple...
In this paper, continuous phase modulation (CPM) is detected using TURBO-BLAST space-time architecture to improve the system performance. This is realized by implementing an iterative architecture according to the trellis structure of CPM modulation in space-time communication systems. This architecture provides the benefits of the space-time wireless communication systems while it preserves the advantages...
This paper presents a novel space-time fast frequency hopping (FFH) multiple input multiple output (MIMO) wireless communication system over rayleigh fading channel. With the M-ary frequency shifting keying (MFSK) modulation and noncoherent demodulation, the structure of a new system is discussed based on the combination of FFH technique and MIMO system. The concept of generalized wide-interval FH...
Transmit diversity in orthogonal frequency division multiplexing (OFDM) has gained a lot of interest recently due to its ability to transform frequency selective fading into multiple flat fadings. In this paper we investigate 2 transmit and 1 receive (2Tx:1Rx) space-time OFDM (ST-OFDM) and space-frequency OFDM (SF-OFDM) systems in conjunction with convolutional precoding as a redundancy method to...
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