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In this paper, we analyze and simulate performance of space time block coded (STBC) binary pulse amplitude modulation-direct sequence (BPAM-DS) ultra-wideband (UWB) systems with double binary turbo code in indoor environments. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel, which is proposed as a UWB indoor channel model by IEEE 802.15.SG3a. From simulation...
As the demand of high quality service in next generation wireless communication systems, a high performance of data transmission requires an increase of spectrum efficiency and an improvement of error performance in wireless communication systems. In this paper, we propose a multi-user multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with cyclic delay...
As the demand of high quality service in next generation wireless communication systems, a high performance of data transmission requires an increase of spectrum efficiency and an improvement of error performance in wireless communication systems. In this paper, we propose a multi-user multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with cyclic delay...
There are a few core technologies to enable high-performance 4th generation (4G) broadband wireless communication system. A multiple input multiple output (MIMO) provides high-rate transmission through expended channels by multiple array antennas in both sender and receiver side. Also orthogonal frequency division multiplexing (OFDM) is well-known as the most appropriate technique for high data rate...
In this paper, the performance of a double binary turbo coded space time block code-ultra wide band (STBC-UWB) system is analyzed and simulated in multi-user environments. From the simulation results, it is demonstrated that the double binary turbo coding technique offers considerable coding gain with reasonable encoding and decoding complexity. It is confirmed that the double binary turbo coding...
Cognitive radio (CR), which is proposed as a technology that utilizes the frequency resources effectively, has studied to relive scarcity of the frequency resources. CR provides opportunistically under-utilize licensed frequency to the secondary user. Spectrum sensing is the most important technology to detect primary user. However, in the wireless channels, according to the effect of fading and shadowing...
In this paper, we analyze and simulate the iterative decoding performance of space time block coded (STBC) pulse position modulation-time hopping (PPM-TH) ultra-wideband (UWB) systems in indoor environments. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel, which is proposed as a UWB indoor channel model by IEEE 802.15.SG3a. In order to reduce the iterative decoding...
In this paper, performance of binary pulse position modulation-time hopping (BPPM-TH) and the binary pulse amplitude modulation-direct sequence (BPAM-DS) ultra wide band (UWB) systems with a double binary turbo code is analyzed and simulated in an indoor wireless channel. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel. The performance is evaluated in terms of...
Ultra wide-band (UWB) indoor channel is highly time scattered with large number of multi-path and a transmit power of UWB systems is limited to low level. One method to overcome these weak points of UWB communication is diversity combining technique. In this paper, we simulate and analyze performance of pulse position modulation-time hopping (PPM-TH) UWB systems adopting a space time block coding...
In this paper, a simple timing jitter minimization algorithm is suggested and analyzed for wireless broadband (WiBro) network. In order to reduce timing jitter which exists in delays between master and slave, next delay is estimated by using previous one. Then these estimated things are not according to exact ones which do not include jitter. But timing jitter can be certainly reduced although remaining...
Frame synchronization is an critical factor for an effective operation of OFDM (orthogonal frequency division multiplexing) based communication systems. In this paper, we present and analyze an efficient frame synchronization method based on m-sequence for OFDM-based mobile multimedia communication systems. Repeated m-sequence is superimposed directly to OFDM frames in the time domain. By utilizing...
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