Shu (Marloon) Wang

The Seagate GoFlex Home product line is a serial of network attached storage (NAS) devices made by Seagate for home computer network storage and backup.  As reported, it essentially is a plug computer powered by a 1.2GHz Marvell Kirkwood ARM processor 88F6281 (ARMv5te based) teamed up with 128MB of Nanya RAM and 256MB of flash memory. My Seagate GoFlex Home NAS 2TB comes with a 2TB storage space, a gigbit ethernet port and an USB 2.0 port. Inside the storage enclosure is a 3.5-inch hard disk reported to be a Seagate Barracuda ST32000542AS. The ethernet port is reported to be driven by a Marvell 88E116R LAN controller. Figure 1. Seagate GoFlex Home Network Storage System Before installing Optware packages on a Seagate Plug, you need decide whether you should install them on the onboard flash memory or an external storage, such as the attached NAS or an attached USB thumb drive. In my case, I chose to straightly install the packages on the NAS and mount the installation subdir...

A list for who knows what it is for. Check DHCP 100# Enable/Disable DHCP 101# Check IP address 110# Set IP address 111# (use * for period) Check Network Mask 120# Set Mask 121# Check Gateway 130# Set Gateway 131# Check MAC 140# Check Firmware version 150# Check DNS 160# Set DNS 161# Check Web Server Port 170# Enable/Disable Web Server 7932# (may require password) Manual Reboot 732668# User Factory Reset (only changes user settings) 877778# Factory Reset (all non default settings change) 79738#

[How to Broadcast Multimedia Contents? I Introduction] [How to Broadcast Multimedia Contents? II Lessons from The Channel] [How to Broadcast Multimedia Contents? IV Hierarchical Modulation] [How to Broadcast Multimedia Contents? V Overloaded Transmission and IC] [How to Broadcast Multimedia Contents? VI Open-Loop MIMO for Broadcast Multicast Services] Many broadcast/multicast infrastructures are engineered for delivering a wide range of contents, such as streaming media, multicast media and even IP datacast. Though all of them have the similar capabilities of delivering a pretty-much same set of services,  their bear technologies and network layer or stream layer designs are varied. In terms of physical layer, ATSC uses 8 VSB while DVB, FLO and ISDB use OFDM in their air interface designs. In terms of stream layer design, DVB-H uses IP, ISDB uses MPEG TS, T-DMB and FLO use their own mapping between application layer and MAC layer logic channels.

In wireless broadcast multicast services (BMS), a standard assumption is that each receiver knows something about the channel h, usually referred as channel side information (CSI) or channel quality information (CQI). This is a pretty reasonable assumption when the channel is fading slowly inside the design boundary since there are pilot symbols available for the receiver to estimate CQI. Since the channel and transmitted signals are independent to each other, the ergodic capacity of the fading channel with receiver side information is given by C fading ( SNR, h ) = E log( 1 + |h| 2 SNR ) ≤ C AWGN ( E(|h| 2 ) SNR ). This means fading hurts or reduces the capacity in general if the transmitter knows nothing of the fading. This is different to the case that assumes the transmitter can estimate channel through CQI feedback and therefore can do some precoding on broadcast signals. Since a statistic analysis on a log(*) probability function is non-trivial, one approach is to apply the...

Instead of the traditional single-coverage model, a layered broadcast model with a two-layer coverage is considered here. In this model, the broadcast station (BS) broadcast two layers of signal to all mobile stations (MS) in the covered area. The signal for the inner coverage has the achievable rate of R 1 and the achievable rate for the outer coverage is R 2 , where R 1 > R 2 . The MS's located near to the outer coverage edge may only be able to reliably decode the data stream of a low rate R 2 while the MS's close to the BS can decode both data streams with a high sum rate R 1 . There many ways for achieving this two-layer broadcasting, including frequency-division multiplexing (FDM), time-division multiplexing (TDM) and superposition precoding (SPC).  Figure 1. Achievable capacity region of broadcast channel. The coverage difference is 6dB.  One key aspect of studying two-layer broadcast is the finding of the achievable broadcast channel capacity, which states ...

Broadcast multicast service (BMS) has increasingly been popular for delivering multimedia content to mobile users. BMS can be implemented through either a dedicated digital broadcast infrastructure like DVB-T/H/S2, MediaFLO and DMB or a 3rd generation and beyond radio access network like UMTS or cdma2000 network. Traditional digital broadcast air interface and network are designed with the tradeoff between the achievable capacity and intended coverage in mind. The actual throughput is limited by the maximum transmit power and the worst channel condition so that each user in the coverage area can reliably receive services. Therefore, all covered users share services with same quality. The users under good reception condition may not have advantages, even though their achievable throughput can be much higher. In addition, there are also rising interests in upgrading existing digital broadcast systems with more services for new users while be able to keep existing users unchanged, deliver...

What Is The Next for Mobile System Design? I A Single-Cell Model Perspective on Downlinks [How to Broadcast Multimedia Contents? I Introduction] [How to Broadcast Multimedia Contents? II Lessons from The Channel] [How to Broadcast Multimedia Contents? IV Hierarchical Modulation] [How to Broadcast Multimedia Contents? V Overloaded Transmission and IC] [How to Broadcast Multimedia Contents? VII Network Layer or Steam Layer Design] One most well-known space-time block coding (STBC) design is Alamouti code, which is the simplest open-loop orthogonal STBC. Alamouti code was designed for a two-transmit antenna system. It is a rate-1 code. It is the first open-loop encoding method with full diversity. Though orthogonal STBC has the advantages of relatively easy receiver design and full diversity, it is known that full-rate STBC don’t exist for more than 2 transmit antenna. From previous discussion, if two orthogobal STBCs are superimposed together and each of them experiences differen...