An Improved Transmission Rate in Cooperative Communication Based on OFDMA System

Cooperative Diversity Technique Using Spatial Phase Coding Based on OFDMA System

“…If the SNR D is guaranteed, the BER performance of the propose scheme is improved. Figure 6 shows a BER performance of the proposed scheme and another cooperative scheme for OFDMA system [9] when the value of SNR D is 0, 5 and 10. A BER performance of the proposed scheme is better than the another cooperative scheme.…”

“…A BER performance of the proposed scheme is better than the another cooperative scheme. Figure 7 shows a throughput of the proposed scheme and another cooperative scheme for OFDMA system [9] for the value of SNR D = 10. The calculation of throughput is as follows,…”

“…Some schemes are proposed to improve transmission rate. One of the schemes improves transmission rate by new symbol structure using STBC base on OFDMA system [9]. In this letter, a new cooperative scheme using OFDMA and SPC scheme is proposed.…”

“…In this letter, a new cooperative scheme using OFDMA and SPC scheme is proposed. In [9], 3 signals that are composed of the original and duplicated signals are transmitted for 4 time slots, but the proposed scheme transmits nearly a signal for 1 time slot by new symbol structure using SPC. The proposed scheme can avoid rate-loss and improve throughput.…”

The Improved Performance of the Shadow Area User by Using the Relay in the Wireless Communication System

“…Transmission systems based on orthogonal frequency division multiplexing (OFDM) can be extended to a multiple input multiple output (MIMO) systems in order to obtain high performance [1]. The MIMO-OFDM system obtains the high data rate or the high reliability without the use of additional bandwidth and power consumption in wireless communication [2].…”