Baiko Sai

A Gigabit MIMO WLAN system with international standardization strategy

This paper presents a design of Gigabit MIMO WLAN system with international standardization strategy. The proposed preamble supports gaining the throughput while maintaining the backward compatibility with the IEEE 802.11a/n WLAN systems. It has comparable PAPR and preamble efficiency with IEEE 802.11n mixed mode preamble. Run test under residential channel model shows that our system can achieve throughput over 1 Gbps for 45 meter propagation distance with low BER.

Design of 1.2 Gbps MIMO WLAN system for 4K digital cinema transmission

This paper deals with our work in designing a 1.2 Gbps WLAN system. It reaches 33 meter propagation distance by using 80 MHz bandwidth on 5 GHz band. The proposed preamble has backward compatibility with IEEE802.11n system, allows band sharing and avoids collision within 5 GHz band. The proposed preamble has comparable PAPR and preamble efficiency with IEEE802.11n system. The 4 × 5 MIMO configuration contributes 2nd-order diversity gain and maintains both the throughput and performance. Run test for transmitting 90 frames of 4K digital cinema under in-door channel model demonstrates the excellent performance of the proposed system.

300-Mbps OFDM baseband transceiver for wireless LAN systems

This paper presents an OFDM transceiver for wireless LAN systems and its baseband transceiver architecture. We study the optimum parameters about DFT size, guard interval, symbol duration, and number of subcarriers in an 80-MHz bandwidth by extending the IEEE 802.11a standard. The proposed transceiver has a maximum 300-Mbps transmit rate and achieves 600 Mbps by use of a 4times2 MIMO system. We have designed the SISO-OFDM transceiver in a 0.25-mum CMOS technology. The transceiver consumes about 800 mW at 2.5-V power supply and 80-MHz clock frequency. For verification, the architecture has been implemented to a FPGA prototype. We describe the parameters of our proposal and the TGn Sync optional proposal by comparison

RTL design of 1.2Gbps MIMO WLAN system and its business aspect

This paper deals with the development of 1.2 Gbps MIMO wireless LAN system based on IEEE802.11TGacs functional requirements. It reaches 33 meter propagation distance by using 80MHz of bandiwdth on 5GHz band. 4 × 5 antennas configuration contribute 2{sund|-order diversity gain and maintain both the high throughput and the high performance. The proposed Greenfield format preamble has high preamble efficiency. Novel phase rotation is employed to get low PAPR signal of preamble and data fields. Three different coding rates are examined for 64-QAM constellation which all accomplish over 1 Gbps with maximum throughput 1.266 Gbps. Synthesis results indicate that the the prototype system as the initial development of the proposed system can be implemented in target FPGAs of Xilinx Virtex-5 SX240T and LX330T.

Design of 600 Mbps MIMO wireless LAN system using GLST coding and its FPGA implementation

In this paper we report our works on designing MIMO wireless LAN system with throughput 600 Mbps for 30 meter propagation range by using Generalized Layered Space Time (GLST) coding and its implementation on field programmable gate array (FPGA) chips. At the receiver we employ our low-complexity GLST decoder to maintain error performance with low computational complexity. A novel packet format is developed that allows compatibility with the IEEE 802.11 a/n system. Our system works on 5,25 GHz carrier frequency with 80 MHz bandwidth, uses 4 transmit antennas and 2 receive antennas and gives superior performance on channel model B TGn. The Register Transfer Level results show that the developed system is synthesized succesfully as well as the implementation on the target FPGA chips.

Live demonstration: IEEE802.11 wireless LAN system verification platform

This is a demonstration description of our verification platform for wireless LAN applications. This verification platform consists of a motherboard containing a sizable Stratix IV FPGA, a 2.4GHz/5GHz RF daughterboard, and a highly flexible MPU daughterboard. For the MAC layer, which is implemented as a software/hardware co-design, the software part is implemented in the MPU daughterboard while the hardware part is implemented in the motherboard FPGA. For the PHY layer, which consists of a digital baseband part and analog RF part, the digital part is implemented also in the motherboard FPGA while the analog part is implemented in the RF daughterboard. We demonstrate implementation results of our platform running a IEEE802.11 based wireless LAN (WLAN) System-on-Chip (SoC) design. This demonstration is associated with Digital Signal Processing (Track 4).

4K digital cinema home theater over high throughput wireless transmission system

In this paper, we propose a 4K digital cinema transmission over 1.2Gbps wireless LAN system. The proposed system employs the next generation wireless LAN system based on IEEE802.11ac specification. It reaches more than 33 meter propagation distance by using 80MHz of bandwidth on the 5GHz band. In this system, video data is compressed by JPEG 2000 with error resilience tools. These tools improve error performance against wireless channel, and enable very high throughput communication. Computer simulations are used to evaluate the bit error performances influences to the video quality. Finally, we present RTL design results of the proposed wireless LAN system.

300-Mbps OFDM transceiver for wireless communication with an 80-MHz bandwidth

This paper presents a wireless system to reach a 300-Mbps transmit rate in OFDM wireless communication and a hardware architecture for the OFDM baseband transceiver. We study optimum parameters about OFDM frame, DFT size, and allocation of subcarriers that are required for the wireless system with a 80-MHz bandwidth, extending the IEEE802.11a standard. The proposed system has a maximum 300-Mbps transmit rate and attains 600 Mbps using MIMO-OFDM with two receiver antennas. We evaluated BER performance and designed the OFDM transceiver for the proposed wireless system as practical solutions. The transceiver operates at an 80-MHz frequency and occupies 1.37 million logic gates using a 0.25 /spl mu/m CMOS technology. For rapid verification, the OFDM transceiver is implemented to a FPGA prototype that enables data transmission on a baseband channel.

HDTV over MIMO wireless transmission system

In this paper, we propose a HDTV transmission over IEEE802.3ac 4×5 MIMO WLAN System. The proposed system employs the next generation wireless LAN system based on IEEE802.3ac specification. It reaches more than 33 meter propagation distance by using 80MHz of bandwidth on the 5GHz band. In this system, video data is compressed by JPEG 2000 with error resilience tools. These tools improve error performance against wireless channel, and enable very high throughput communication. Computer simulations are used to evaluate the bit error performances influences to the video quality. Finally, we present RTL design results of the proposed wireless LAN system.

Pilot Aided Channel Estimation for a 2×2 MIMO DVB-T2 System in High Speed Mobile Environment

The combination between a two dimensional (2D) filter with a non-rectangular spectrum and the 3- points diagonal averaging method is proposed in this paper as a channel estimation method for a 2×2 MIMO DVB-T2 system. The 3-points diagonal averaging method can shorten the distance between reference pilot along frequency direction before interpolation; consequently, it will optimize the performance of an interpolation filter. The two stages implementation of a 2D nonrectangular filter is also proposed in this paper to reduce the complexity of the channel estimation method. Simulation results show the robustness of the proposed method in very high speed mobile environment.