Abstract
IEEE 802.16 is a standard for Broadband Wireless Access (BWA) air interface. 802.16e supports mobile broadband wireless access, which is an additional feature over its predecessors, which support fixed wireless access. Binary Convolutional Turbo Coding (CTC) is used as mandatory Forward Error Correction method in 802.16e. In this paper the performance of a simple and efficient optional coding scheme namely Turbo Product Code (TPC) is proposed for 802.16e system and is compared with CTC.
Highlights
IEEE 802.16 standard system or commonly called Worldwide Interoperability for Microwave access (WiMAX), provides specifications for both fixed Line of Sight (LOS) communication in the range of 10-66 GHz (802.16c), and fixed, portable, Non-LOS communication in the range of 211GHz (802.16a, 802.16d)
The architecture is based on scalable sub channel bandwidth using variable size fast Fourier Transform (FFT) according to channel bandwidth
The decoding speed of a Turbo Product Code (TPC) can be increased by using several elementary decoders for the parallel decoding of the rows of a product code since they are independent [10]. These features, of TPC can be effectively used in a high data rate application like the Wimax 802.16 systems
Summary
IEEE 802.16 standard system or commonly called Worldwide Interoperability for Microwave access (WiMAX), provides specifications for both fixed Line of Sight (LOS) communication in the range of 10-66 GHz (802.16c), and fixed, portable, Non-LOS communication in the range of 211GHz (802.16a, 802.16d). The block diagram of a general Wimax system is shown in figure 1 The performance of this system can be further enhanced by using forward error correcting techniques. Used error correcting method for a wireless medium for 802.16 standard is Convolutional Turbo Codes (CTC). Afterwards, in a second encoding step, the interleaved information symbols (A and B) are again fed into the constituent encoder, producing the parity bits Y2 and W2. This means the info/code tuple of the CTC encoder is AB/ABY1W1Y2W2 and its natural rate is 1/3. The complexity of this decoding process increases exponentially as they get closer to optimality
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