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There exists an increasing strong demand for internet application in passenger trains, and the wireless broadband coverage along the whole railway is a prerequisite of the internet application in passenger trains. Wireless Mesh Network(WMN) based on 802.16 provides a new solution idea for the wireless broadband coverage of the railway, which is based on OFDM technology to support high-bandwidth data...
In this paper, a physical-layer baseband modem is discussed based on IEEE 802.16 protocol. It is implemented on Xilinx FPGA and tested correctly in loop-mode. After channel coding, a bit stream goes through constellation mapper, pilot inserting, OFDM(Orthogonal Frequency Division Multiplexing) modulation, PAPR(Peak to Average Power Ratio) reduction and framing module to become 7 symbols in IQ parallel...
In the IEEE 802.16d Orthogonal Frequency Division Multiplexing (OFDM) physical layer protocol, which provides the Space-Time Coding (STC) scheme to improve system performance, it is possible to get a better performance in resisting multipath fading and increasing bandwidth efficiency. However, in projects, using Multiple-Input Multiple-Output (MIMO) multiple-antenna technology is usually inconvenient...
This paper proposed a new Modified algorithm under the Vectoring Mode CORDIC algorithm called MVM-CORDIC algorithm, which is used to calculate the angle of frequency offset estimation in the communications system. From the simulation result, we can see that under the certain accuracy the MVM-CORDIC algorithm can reduce the iteration number by contrasting to the conventional CORDIC algorithm, meanwhile...
In orthogonal frequency division multiplexing (OFDM) system, synchronization and channel estimation are two important issues under the wireless fading channel in broadband wireless communication. The timing and frequency offset will affect the accuracy of channel estimation. These issues are studied in this paper, and a frequency selective fading channel under the OFDM system model is set up. This...
Orthogonal frequency division multiplexing (OFDM) as the leading technology for future mobile communication, PAPR reduction is an important research subject which still needs to be researched on. Aiming at solving the problem that complexity of partial transmitting sequence (PTS) method, we propose a low-complex improved algorithm - iterative PTS based on the traditional PTS, and furthermore, a low...
WiMAX, as a key standard in last-mile access, is expected to support QoS guarantees for multi-services. Developing adaptive bit and power allocation according to quality of service (QoS) requirements is important to different services. In this paper, an adaptive multi-service bit and power allocation based on game theory is proposed for orthogonal frequency division multiplexing (OFDM) WiMAX networks...
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