The feasibility of applying a self-adaptive filter to eliminate noise in the downhole mud pressure phase shift keying (PSK) signals is studied. The self-adaptive filter with carrier wave as the filter input signal and mud pressure PSK signal including noise as the filter expected input signal in structure was adopted to process the mud pressure PSK signals with the broadband signal characterist...

Wireless broadband communications is a rapidly growing industry. New enabling technologies such as multi-carrier code division multiple access (MC-CDMA) are shaping the future of wireless systems. However, research efforts in improving MC-CDMA receiver performance have received limited attention and there is a need for innovative receiver designs for next generation MC-CDMA. In this thesis, we ...

Abstract The microstatistic multi-user receiver (MSF-MUD) belongs to non–linear single–stage multi-user receivers' family (NSS–MUD) [1-3]. The output of the MSF-MUD is taken as the sign of the multi-channel nonlinear transformation of the output of a bank of the matched filters (BMF). The non-linear transformation is made by multi-channel conventional microstatistic filter (M-CMF) [2]. The M-CM...

12 13 The removal of fluoride using red mud has been improved by acidifying red mud with 14 hydrochloric, nitric and sulphuric acid. This investigation shows that the removal of fluoride 15 using red mud is significantly improved if red mud is initially acidified. The acidification of 16 red mud causes sodalite and cancrinite phases to dissociate, confirmed by the release of 17 sodium and alumi...

Wireless measure while drilling (MWD) transmits data by using mud pulse signal ; the ground decoding system collects the mud pulse signal and then decodes and displays the parameters under the down-hole according to the designed encoding rules and the correct detection and recognition of the ground decoding system towards the received mud pulse signal is one kind of the key technology of MWD. T...

Detecting mud hazards is a significant challenge to unmanned ground vehicle (UGV) autonomous offroad navigation. A military UGV stuck in a mud body during a mission may need to be sacrificed or rescued, both unattractive options. The Jet Propulsion Laboratory is currently developing a daytime mud detection capability under the U.S. Army Research Laboratory Robotics Collaborative Technology Alli...

CMC polymer is used as an additive to decrease water loss and mud-cake-thickness in mud drilling. In this study, the effect of CMC and CMC nanoparticles on water loss and mud-cake-thickness in mud drilling is investigated. CMC nanoparticles are made by using of ball milling and their size is measured by Particle size analyzer. CMC and CMC nanoparticles which were prepared by Hamilton batch mixe...

Position: 39°21.9370′N, 72°41.6750′W Start hole: 1400 hr, 29 June 1997 End hole: 1500 hr, 2 July 1997 Time on hole: 73 hr (3.04 days) Seafloor (drill pipe measurement from rig floor, mbrf): 109.5 Total depth (drill pipe measurement from rig floor, mbrf): 416.3 Distance between rig floor and sea level (m): 11 Water depth (drill pipe measurement from sea level, m): 98.1 Penetration (mbsf): 306.8 ...

Abrtnxcl-In this contribution wa p r ~ p a ~ now1 Coded Modulation auhtad Genatic Algorithm based hrfultirwr Detection (CM-GA-MUD) scheme for synchronous CDhrIA systems. The parfonnnnce of the p r o p 4 acheme WIU invatigatad ruing QusdraturaPhsraShift-Keying (QPSK), when communiuting over AWGN m d narrowband Rqyleigh fading chnnneb. When cumpard with the optimum MUD acheme. the CA-MUD subsytta...