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In-Band On-Channe (IBOC) digital audio broadcasting (DAB) is a method of digital audio radio , which could transmit analog FM and digital audio simultaneously. However, due to the existence of fading and interference in FM bands, transmit capacity has reached its limitations for the bandwidth, thus, adding digital transmission in the crowded FM band is a challenging proposition. Diversity is one of...
We consider improving the performance of orthogonal frequency-division multiplexing (OFDM)-based mobile broadband wireless communication (MBWC) systems over time-varying frequency-selective fading channels. To battle the problem related to frequency-selective fading, we can use space-time block coding (STBC) on each OFDM subcarrier. To battle the problem related to time varying as well as that related...
Multiple-input multiple-output (MIMO) is a generic technique that promises to be a strong contender for 4G wireless systems. This paper presents the design and implementation of a space time block coding (STBC) encoder that is based on Alamouti scheme on a Xilinxreg Virtextrade-4 XC4VLX60 field programmable gate arrays (FPGA) device. This encoder is a part of MIMO testbed, equipped with multiple element...
In this work we study the performance degradation caused by the in-phase/quadrature (I/Q) imbalance in space-time block coded (STBC) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) communication systems. The 2-Tx Alamouti scheme, 4-Tx quasi- orthogonal STBC (QOSTBC) scheme, and 4-Tx rotated QOSTBC (RQOSTBC) scheme with I/Q imbalance are examined in details....
In this paper, the effect of transmitter diversity on asynchronous co-channel interference suppression and equalization is studied in multi-user multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Space division multiple access OFDM may be an appropriate solution to design spectrally efficient and high data-rate communication systems. Moreover, communication...
Broadband wireless access (BWA) technique has attracted great attention in the last mile access industry. In this paper, an effective MAP receiver for concatenated space time block code (STBC) and convolutional code MIMO-OFDM system (denoted as CSCM receiver) for further performance improvement of IEEE wireless MAN-OFDMA system is derived and designed in detail. Simulation results show that the receiver...
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