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In this paper, we investigate the performance of the ARQ-aided downlink Time Switched Transmit Diversity (TSTD) in the WCDMA LCR-TDD system, when power ramping is applied. Proposed scheme ramps up the transmission power and then retransmits the data, when the receiver sends the response signal (ACK or NACK signal) to the transmitter and the response signal is NACK signal. Simulation results demonstrate...
In this paper, novel operating and backup channels allocation schemes for IEEE 802.22 system are introduced and their performances are investigated. Interference level and the probability of appearance for incumbent user are taken into account in order to optimally update the backup channels list. Additionally, the operating channel is allocated based on Carrier to Interference and Noise Ratio (CINR)...
In this paper, novel operating and backup channels allocation schemes for IEEE 802.22 system are introduced and their performances are investigated. Interference level and the probability of appearance for incumbent user are taken into account in order to optimally update the backup channels list. Additionally, the operating channel is allocated based on Carrier to Interference and Noise Ratio (CINR)...
In this paper, a novel channel sharing scheme for IEEE 802.22 systems is introduced and its performance is investigated. In order to minimizing the number of user to share one channel, the status of backup channels, not occupied by any adjacent users, is checked. In addition, the condition of channels occupied by neighboring users is investigated. Based on these channel statuses, the proposed channel...
In this paper, the antenna switching scheme is proposed for Time Switched Transmit Diversity (TSTD) with ARQ (automatic repeat request) in WCDMA LCR-TDD systems, and the system performances are also investigated. The proposed TSTD system employs the ARQ scheme in which the receiver sends the acknowledgement signal (ACK or NACK) to the transmitter in order to predict the condition of the channel. For...
In this paper, the authors investigate the performance of ARQ-aided downlink time switched transmit diversity (TSTD) in the WCDMA LCR-TDD system. The proposed TSTD system employs the ARQ scheme in which the receiver sends the acknowledgement signal (ACK or NACK signal) to the transmitter in order to predict the channel condition. Simulation results demonstrate that the proposed TSTD scheme yields...
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