介绍了一种用FPGA实现满足IEEE802.16e协议的实时LDPC(Low Density Parity Check,低密度奇偶校验码)编码器的设计方法。设计充分利用校验矩阵H中循环右移的特点,有效地实现了线性编码。用Verilog语言和Matlab语言联调,最终实现了基于802...介绍了一种用FPGA实现满足IEEE802.16e协议的实时LDPC(Low Density Parity Check,低密度奇偶校验码)编码器的设计方法。设计充分利用校验矩阵H中循环右移的特点,有效地实现了线性编码。用Verilog语言和Matlab语言联调,最终实现了基于802.16e协议的编码器。得到的FPGA综合报告表明,在占用比传统编码器更少的存储资源的条件下,编码器符合802.16e标准的要求,能够被标准所运用。展开更多
IEEE 802.16a is a wideband wireless access standard of the new generation,which is submitted by ITU on Apr. 2002.The standard advises to use OFDM or Single Carrier Frequency Domain Equalization in physical layer.As a ...IEEE 802.16a is a wideband wireless access standard of the new generation,which is submitted by ITU on Apr. 2002.The standard advises to use OFDM or Single Carrier Frequency Domain Equalization in physical layer.As a part of the national 863 research project,this paper investigates SC-FDE scheme of wideband wireless access systems.We set up an integrate simulation platform and put forward a SC-FDE scheme combining with MIMO and RS-CC to improve the system performance further.展开更多
Based on the structures of the short preamble and long preamble,which are defined for synchronization in IEEE802.16e specification,the robust synchronization algorithm for IEEE802.16e OFDM system is proposed.The corre...Based on the structures of the short preamble and long preamble,which are defined for synchronization in IEEE802.16e specification,the robust synchronization algorithm for IEEE802.16e OFDM system is proposed.The correlations among the sample sequences in the preamble are investigated,especially the correlation between the first sample sequence and the last sample sequence in the long preamble.The conventional joint timing and frequency synchronization algorithm is reviewed based on the short preamble referring to the algorithm proposed by Schmidl,then a robust joint timing and frequency synchronization algorithm is proposed based on the long preamble.The simulations in the multi-path and frequency selective fading channel show that the proposed algorithm has improved the performances of timing metric plateau,timing offset and synchronization acquisition time even when signal-to-noise ratio is less than-5 dB.展开更多
A set of integrated Orthogonal Frequency Division Multiplexing(OFDM) modulation and demodulation system is proposed and its performance is verified in reference to the standard of IEEE802.16a for WMAN.The design,combi...A set of integrated Orthogonal Frequency Division Multiplexing(OFDM) modulation and demodulation system is proposed and its performance is verified in reference to the standard of IEEE802.16a for WMAN.The design,combined with analogy front-end,adopts Texas Instrument(TI) Company's 6701 evaluation module(EVM) to construct digital Intermediate Frequency(IF) platform.A DSP-based baseband processing software module is embedded into the system.The proposed scheme makes it possible for users to select various software modules to set up connections with different throughput performance.Taking into account the given hardware configuration,the design aims to optimize the algorithm modules to accomplish better system performance.展开更多
文摘介绍了一种用FPGA实现满足IEEE802.16e协议的实时LDPC(Low Density Parity Check,低密度奇偶校验码)编码器的设计方法。设计充分利用校验矩阵H中循环右移的特点,有效地实现了线性编码。用Verilog语言和Matlab语言联调,最终实现了基于802.16e协议的编码器。得到的FPGA综合报告表明,在占用比传统编码器更少的存储资源的条件下,编码器符合802.16e标准的要求,能够被标准所运用。
基金part of National 863 Project numbering 2002AA123046
文摘IEEE 802.16a is a wideband wireless access standard of the new generation,which is submitted by ITU on Apr. 2002.The standard advises to use OFDM or Single Carrier Frequency Domain Equalization in physical layer.As a part of the national 863 research project,this paper investigates SC-FDE scheme of wideband wireless access systems.We set up an integrate simulation platform and put forward a SC-FDE scheme combining with MIMO and RS-CC to improve the system performance further.
文摘Based on the structures of the short preamble and long preamble,which are defined for synchronization in IEEE802.16e specification,the robust synchronization algorithm for IEEE802.16e OFDM system is proposed.The correlations among the sample sequences in the preamble are investigated,especially the correlation between the first sample sequence and the last sample sequence in the long preamble.The conventional joint timing and frequency synchronization algorithm is reviewed based on the short preamble referring to the algorithm proposed by Schmidl,then a robust joint timing and frequency synchronization algorithm is proposed based on the long preamble.The simulations in the multi-path and frequency selective fading channel show that the proposed algorithm has improved the performances of timing metric plateau,timing offset and synchronization acquisition time even when signal-to-noise ratio is less than-5 dB.
文摘A set of integrated Orthogonal Frequency Division Multiplexing(OFDM) modulation and demodulation system is proposed and its performance is verified in reference to the standard of IEEE802.16a for WMAN.The design,combined with analogy front-end,adopts Texas Instrument(TI) Company's 6701 evaluation module(EVM) to construct digital Intermediate Frequency(IF) platform.A DSP-based baseband processing software module is embedded into the system.The proposed scheme makes it possible for users to select various software modules to set up connections with different throughput performance.Taking into account the given hardware configuration,the design aims to optimize the algorithm modules to accomplish better system performance.
