Previous
Transmission Capacity Of CDMA Ad Hoc Networks Employing Successive Interference Cancellation
White Papers Successive interference cancellation (SIC) is attractive for DS-CDMA ad hoc networks since the dominant nearby interferers can be cancelled. In this paper, upper and lower bounds on the transmission capacity of direct-sequence CDMA wireless ad hoc...
[October 13, 2005, 3:00]
A Spreading Sequence Allocation Procedure For MC-CDMA Transmission Systems
White Papers 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.
[August 1, 2004, 3:00]
Throughput Comparison Of CDM And TDM For Downlink Packet Transmission In CDMA Systems With A Limited Data Rate Set
White Papers Throughputs with Code-Division Multiplexing (CDM) and Time-Division Multiplexing (TDM) for downlink packet transmission are compared in multirate Code-Division Multiple Access (CDMA) systems. The authors propose and use a model that can show the...
[February 22, 2006, 0:01]
Drowning In Wireless Spaghetti
News Each decision affects a number of factors: power consumption, how many transmitters can operate in a particular area, how far the transmission reaches, how resistant a signal is to interference, how much data can be carried, how easy it is to...
[November 1, 2005, 12:00]
Transmission Rate Scheduling With Fairness Constraints In Downlink Of CDMA Data Networks
White Papers Proper transmission rate scheduling of data service in downlink can reduce the intra-cell interference; hence maximize the throughput of the downlink. Various works have been done for the transmission rate scheduling to maximize total throughput in...
[February 22, 2006, 0:01]
Space-Time Block Coding For Single-Carrier Block Transmission DS-CDMA Downlink
White Papers However, if not carefully designed, the resulting transmission scheme suffers from increased multiuser interference (MUI), which dramatically deteriorates the performance. To tackle this MUI problem in the downlink, two specific DS-CDMA and STBC...
[July 26, 2005, 6:00]
Differentiated MAI Control For Hybrid ARQ-II In CDMA Networks
White Papers Multiple access interference (MAI) is a bottleneck to limit the capacity of CDMA system. Differential MAI control is proposed for hybrid ARQ-II of CDMA networks by noticing that successive trials of transmission have increasing error-correcting...
[July 26, 2005, 6:00]
Transmission Capacity Of Wireless Ad Hoc Networks With Successive Interference Cancellation
White Papers This paper develops closed-form bounds for the transmission capacity of CDMA ad hoc networks with SIC receivers, for both perfect and imperfect interference cancellation. This paper studies the improvement in transmission capacity obtainable with...
[October 11, 2005, 3:00]
Transmission Capacity Of CDMA Ad Hoc Networks
White Papers Analytic results have been developed on the transmission capacity of a CDMA ad hoc network. Spread spectrum technologies are appropriate for ad hoc networking because they permit interference averaging and tolerate co-located simultaneous...
[October 13, 2005, 3:00]
EM-Based Acquisition Of DS-CDMA Waveforms For Radiolocation
White Papers A handshaking protocol for radiolocation is considered using DS-CDMA packet transmission. It is shown that the systematic application of EM on the flat-fading channel yields a parallel interference cancellation (PIC)-based technique for acquisition.
[August 1, 2004, 3:00]
Algorithms For Interference Sensing In Optical CDMA Networks
White Papers Optical CDMA systems have low throughput under moderate to heavy offered load due to interference between codewords. Interference Sensing is a media access architecture where nodes on the network sense the amount of interference on the line before...
[July 24, 2004, 3:00]
Pre-Filtering Using Antenna Arrays For Multiple Access Interference Mitigation In Multi-Carrier CDMA Downlink
White Papers Three criteria for pre-filter design are proposed: Maximum ratio transmission, total interference removal, and maximization of the signal over interference plus noise ratio. The paper shows that joint pre-filtering in space and frequency can...
[October 6, 2005, 3:00]
On The Radio Capacity Of TDMA And CDMA For Broadband Wireless Packet Communications
White Papers This paper addresses the problem of comparing the interference-limited performance of CDMA and TDMA systems in a packet switched environment. The objective is to determine whether the capacity advantages claimed for circuit-switched CDMA still...
[July 20, 2004, 3:00]
CDMA Based MAC Protocol For Wireless Ad Hoc Networks
White Papers By properly estimating the required transmission power for data packets, the proposed protocol allows for interference-limited simultaneous transmissions to take place in the neighborhood of a receiving terminal.
[July 26, 2005, 6:00]
Robust Slope Region For Wideband CDMA With Multiple Antennas
White Papers Vertices of the slope region may be achieved by a matched filter linear interface, followed by successive interference cancellation. This paper analyzes a low power, wideband CDMA system with multiple antennas.
[October 6, 2005, 3:00]
Congestion Sensitive Downlink Power Control For Wideband CDMA Systems
White Papers The model is based on microeconomics, and takes into account both the congestion, in terms of increased interference, that a mobile user imposes to other users, and the downlink resource constraint, which involves the total transmission power at...
[July 29, 2004, 0:00]
Achievable Information Rates And The Coding-Spreading Tradeoff In Finite-Sized Synchronous CDMA Systems
White Papers Unlike most prior work which analyzed the spectral efficiency of large CDMA systems under Gaussianity assumptions (inputs and multi-user interference), no such assumptions are made. This paper computes achievable rates for synchronous Code-Division...
[January 13, 2006, 0:01]
CDMA-Based MAC Protocol For Wireless Ad Hoc Networks
White Papers By properly estimating the required transmission power for data packets, the proposed protocol allows for interference-limited simultaneous transmissions to take place in the neighborhood of a receiving terminal.
[August 1, 2004, 3:00]
Optimal QoS Tradeoff And Power Control In CDMA Systems
White Papers A key assumption is that there is a monotonous relationship between a QoS parameter of interest (such as data rate) and the signal-to-interference ratio at the output of a linear receiver. Although the results are obtained in the context of a power...
[July 26, 2005, 6:00]
Blind DS-CDMA Data And Channel Estimation With An Antenna Array: GSIC/MP/PSP Approach
White Papers The algorithm employs three approaches to solve the problem - the Generalized Successive Interference (GSIC) algorithm, Matching Pursuits (MP), and Per Survivor Processing (PSP). This paper considers a blind DS-CDMA data and channel estimation...
[February 7, 2006, 23:00]
