Signature sequence and training design for overloaded CDMA systems

Ponnaluri, Satya; Guess, T.

doi:10.1109/twc.2007.348330

Cited by 14 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…is a real and positive solution to (15) where (16) From assumption A1, we have (17) for any and . Note that (13) holds only if remains constant as and go to infinity.…”

Section: Introductionmentioning

confidence: 99%

High SNR Performance Analysis of Blind Minimum Output Energy Receivers for Large DS-CDMA Systems

Zarifi

2008

IEEE Trans. Signal Process.

View full text Add to dashboard Cite

High signal-to-noise ratio (SNR) properties of the minimum output energy (MOE) receiver and the Capon channel estimation technique are analyzed in the case of large direct-sequence code-division multiple-access (DS-CDMA) systems. It is shown that if the noise power tends to zero and the system load is less than one, then the signal-to-interference-plus-noise ratio (SINR) of the MOE receiver tends to infinity and the Capon channel estimate converges to a scaled version of the channel vector of the user-of-interest. For the case when the system load is larger than one, an asymptotic SINR expression is obtained. Furthermore, expressions for the efficiency and asymptotic efficiency of the MOE receiver are derived. Simple approximations of (and upper/lower bounds on) these expressions are found and the effects of the system physical parameters on the performance of the MOE receiver are discussed.Index Terms-Blind multiuser detection, Capon channel estimate, minimum output energy (MOE) multiuser receiver, random matrix theory.

show abstract

“…is a real and positive solution to (15) where (16) From assumption A1, we have (17) for any and . Note that (13) holds only if remains constant as and go to infinity.…”

Section: Introductionmentioning

confidence: 99%

High SNR Performance Analysis of Blind Minimum Output Energy Receivers for Large DS-CDMA Systems

Zarifi

2008

IEEE Trans. Signal Process.

View full text Add to dashboard Cite

show abstract

“…For example, when the sequences have low autocorrelation sidelobes, they can improve target detection possibility [1] [2], facilitate synchronization [3] [4] [5] as well as power control [6], etc. Moreover, when unimodular sequences have low cross-correlation sidelobe levels, they can be applied to clutter mitigation [7], improving parameter identifiability [8] and distinguishing users [9]. Therefore, many researchers are attracted to this field in designing unimodular sequences with good auto/cross-correlation properties.…”

Section: Introductionmentioning

confidence: 99%

Unimodular Sequences Design with Good Correlation Properties via Consensus-PDMM Algorithm

Wang

2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

Unimodular sequences with good auto/crosscorrelation properties are favorable in wireless communication and radar applications. In this paper, we focus on designing these kinds of sequences. The main content is as follows: first, we formulate the designing problem as a quartic polynomial minimization problem with constant modulus constraints; second, by introducing auxiliary phase variables, the polynomial minimization problem is equivalent to a consensus nonconvex optimization problem; third, to achieve its good approximate solution efficiently, we propose two efficient algorithms based on alternating direction method of multipliers (ADMM) and parallel direction method of multipliers (PDMM); fourth, we prove that the consensus-ADMM algorithm can converge to some stationary point of the original nonconvex problem and consensus-PDMM's output is some stationary point of the original nonconvex problem if it is convergent. Moreover, we also analyze the nonconvex optimization model's local optimality and computational complexity of the proposed consensus-ADMM/PDMM approaches. Simulation results demonstrate that the proposed ADMM/PDMM approaches outperform state-ofthe-art ones in either computational cost or correlation properties of the designed unimodular sequences.

show abstract

“…To overcome this capacity hard limit, numerous UD [1][2][3][4][5][6][7][8][9][10][11][12][13][14], and non-UD [15][16][17][18][19] construction based systems have already been proposed. For the non-UD based approaches like O/O CDMA, PN/O CDMA [15], improved O/O CDMA [16], the maximisation in system capacity is achieved by collaborating two different sets of code (signature).…”

Section: Introductionmentioning

confidence: 99%