multiple access interference
A Spreading Sequence Allocation Procedure for MC-CDMA Transmission Systems
White Paper This new technique, which relies on an analytical evaluation of the multiple access interference (MAI), mitigates the interference between different users by optimizing the spreading sequence selection within a given spreading sequence family. [03 Jul 2008]
Transmit Beamforming for SDMA in Multi-Carrier CDMA Downlink on a Per Subcarrier Basis
White Paper This combination allows a separation of users' signals in space, thanks to BF, and frequency, thanks to CDMA, and thus improves mitigation of multiple access interference. In this paper, transmit Beamforming (BF) for Space Division Multiple Access... [03 Jul 2008]
Soft Capacity Analysis of TDMA Systems With Slow-Frequency Hopping and Multiple-Beam Smart Antennas
White Paper Then, the interference reduction due to smart antennas, power control, and discontinuous transmission can be directly translated into capacity gain. When fractional loading is accompanied with slow-frequency hopping (SFH), soft capacity can be... [03 Jul 2008]
Linear Quadratic Power Control of CDMA Cellular Systems
White Paper In direct sequence CDMA systems, multiple users share the same bandwidth and are separated by pseudorandom codes; consequently, each user contributes as interference to the others. The role of power control is to command the mobile station to... [03 Jul 2008]
Comparison of Multi-Cell Multi-Antenna CDMA and TDMA Systems
White Paper Irrespective of the multiple access strategy, capacity becomes interference limited. The interference from another cell sharing the same frequency is calculated, and the total interference arising from the frequency reuse pattern is evaluated. [03 Jul 2008]
Synchronization of Optical Orthogonal Codes in Optical CDMA Systems Via Simple Serial-Search Method
White Paper For our analysis we use advance photon-counting methods and we consider the effect of shot noise and dark current and multi-access interference. The paper shows two approaches for considering the effect of multi-access interference on the... [03 Jul 2008]
Variable Bit Allocation for FH-CDMA Wireless Communication Systems
White Paper A frequency-hopped code-division multiple-access system can adapt to the different interference levels in hopping patterns and assign the slots different bit rates to increase the system capacity. The algorithms that achieve the most system... [03 Jul 2008]
Blind Adaptive Detection of DS/CDMA Signals on Time-Varying Multipath Channels with Antenna Arrays Using High-Order Statistics
White Paper A new approach based on multiscale decomposition and higher-order statistics is presented for the simultaneous solution of multiuser interference and time-varying multipath propagation in the uplink of a cellular direct-sequence spread-spectrum... [03 Jul 2008]
Cisco revamps mobility strategy
News Pelham added that wIPS could also detect and report on potential sources of wi-fi interference. The networking company Cisco has launched a new architecture for unifying disparate networks, clients and access technologies. [29 May 2008]
Successive Interference Cancellation Algorithms for Downlink W-CDMA Communications
White Paper In this paper, successive intracell interference cancellation (IIC) of the wideband-code division multiple access (W-CDMA) signal at the mobile unit is considered. Three new interference cancellation techniques suitable for the downlink of any CDMA... [10 Apr 2008]
Linear Parallel Interference Cancellation in Long-Code CDMA Multiuser Detection
White Paper Parallel interference cancellation (PIC) is a promising detection technique for code division multiple access (CDMA) systems. It has previously been shown that the weighted multi-stage PIC can be seen as an implementation of the steepest descent... [10 Apr 2008]
Adaptation of Multiple Access Parameters in Time Hopping UWB Cluster Based Wireless Sensor Networks
White Paper Conventional systems assign identical multiple access parameters to all users regardless of the signal-to-interference plus noise ratio of the received signal. In this paper an adaptive assignment scheme for multiple access parameters in cluster... [23 Aug 2007]
Architecting a High-Capacity Last-Mile Wireless Mesh Network
White Paper This substantially reduces the bandwidth available to each node due to interference between successive hops on the same path as well as between neighboring paths. As a result, conventional single-channel ad hoc network architecture can not be... [19 Aug 2007]
Multi-Code Multicarrier CDMA: Performance Analysis
White Paper The bit error rate of the system is analytically derived in frequency selective fading, with Gaussian noise and multiple access interference. A novel multi-code multicarrier code division multiple access (MC-MC-CDMA) system is proposed and analyzed... [04 Jul 2007]
NETGEAR Serves Up Wireless Success in Coffee House
White Paper Iyer chose NETGEAR WPN824 RangeMax Wireless Router RangeMax Smart MIMO technology which uses 7 internal antennas to adapt on-the-fly to interference, delivering up to 10x more wireless coverage and speed than basic 802.11g routers. [30 Jun 2007]
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