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Abstract
In the last few years, several works have investigated the performance of cooperative wireless systems with various types of channel codes such as Low Density Parity Check (LDPC), Turbo, CRC, convolutional and recently Reed Solomon (RS) codes. These cooperative schemes give power to single antenna mobiles to originate virtual multiple antennas transmitter, MIMO system, by sharing their antennas so that diversity gain is achieved. The most common cooperative schemes are decode and forward (DF) and coded cooperation (CC). Concatenated Reed Solomon and convolutional codes have been used by several wireless communication standards like digital video broadcasting (DVB) standards and IEEE 802.16e WiMAX standard. In this paper, we develop two different coded cooperation schemes and apply them to the mandatory structure of physical layer specifications of IEEE 802.16e WiMAX. The results attained for both coded cooperation schemes present magnificent diversity gains over non-cooperative scheme.
Highlights
Due to the limitations, mentioned above, of decode and forward (DF) systems utilized in some wireless communication standards such as IEEE 802.16e WiMAX standard, this work proposes two coded cooperation (CC) systems applied to the mandatory features of the IEEE 802.16e WiMAX specifications, channel coding with Reed Solomon and convolutional coders (RSCC), to attain less bit error rate (BER) and more diversity gains over non-cooperative scheme
We propose two coded cooperation models that are designed on the basis of the mandatory channel coding of IEEE 802.16e WiMAX, RS codes concatenated with convolutional codes
The outperformance of our system indicates RS- convolutional codes (RSCC), which consists of Reed Solomon and Convolutional codes, is more effective than Rate-Compatible Punctured Convolutional codes (RCPC), which consists of cyclic redundancy check (CRC) and Convolutional codes, in reducing the bit error rate (BER) over Rayleigh fading channels
Summary
Mobile signals are affected by fading. It means the power of the signal is attenuated and fluctuated significantly according to channel conditions due to fading. Many mobile devices cannot support multiple antennas due to size, cost and complexity Another manner, cooperative communication, is used to perform transmit diversity by enabling single antenna mobiles to cooperate by sharing their antennas to create virtual multiple antennas transmitter, MIMO system, in the uplink of a wireless system as shown in Fig. The standard channel coding techniques are utilized to perform cooperation in order to improve diversity. Due to the limitations, mentioned above, of DF systems utilized in some wireless communication standards such as IEEE 802.16e WiMAX standard, this work proposes two coded cooperation (CC) systems applied to the mandatory features of the IEEE 802.16e WiMAX specifications, channel coding with Reed Solomon and convolutional coders (RSCC), to attain less bit error rate (BER) and more diversity gains over non-cooperative scheme
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