Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Performance Evaluation of Wimax Physical Layer under Adaptive Modulation
  Techniques and Communication Channels   Wimax (Worldwide Interoperability for Microwave Access) is a promising
technology which can offer high speed voice, video and data service up to the
customer end. The aim of this paper is the performance evaluation of an Wimax
system under different combinations of digital modulation (BPSK, QPSK, 4 QAM
and 16 QAM) and different communication channels AWGN and fading channels
(Rayleigh and Rician). And the Wimax system incorporates Reed Solomon (RS)
encoder with Convolutional encoder with half and two third rated codes in FEC
channel coding. The simulation results of estimated Bit Error Rate (BER)
displays that the implementation of interleaved RS code (255, 239, 8) with two
third rated Convolutional code under BPSK modulation technique is highly
effective to combat in the Wimax communication system. To complete this
performance analysis in Wimax based systems, a segment of audio signal is used
for analysis. The transmitted audio message is found to have retrieved
effectively under noisy situation.

23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con