Soft iterative multisensor multiuser detection in coded dispersive CDMA wireless channels

Thomas, Julie A.; Geraniotis, E.

doi:10.1109/49.932701

Cited by 16 publications

(5 citation statements)

References 21 publications

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“…Since the environment is essentially interference-limited, multisensor fading diversity can provide only modest gains. 20 Further, in-cell users may be geographically clustered, restricting the spatial separation offered by the beamformer configuration. A simple signature-time transmit diversity technique, proposed here, addresses these limitations, when used in conjunction with multisensor MMSE-IMD receivers.…”

Section: Signature-time Diversity In Cdma Uplink Networkmentioning

confidence: 99%

<title>Efficient algorithms for broadband space-time-coded wireless communication</title>

Thomas

2001

SPIE Proceedings

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Multivariate signaling using multiple-in multiple-out (MIMO) configurations, increases the Shannon capacity of communication links, several fold. Among existing schemes that aim at realizing these predicted gains in practical scenarios, e.g., at high transmission rates or when the transmitter lacks channel state information, are orthogonal space-time block codes (STBCs), which are now known to display good performance characteristics, when concatenated with conventional trellis codes. It is shown that the only full-rate orthogonal STBC (for frequency-fiat fading channels) achieves the (2,1)-channel capacity for single-sensor reception, and a full-rate block-orthogonal STBC is developed for broadband channels. While this STBC is easily adapted for use in the code division multiaccess downlink, a similar technique is necessary for the uplink, where performance degrades in fading media at high system loads. A simple signature-time transmit diversity paradigm, requiring just a single-sensor transmit-antenna at the mobiles, is shown to counter these degradations, in conjunction with iterative minimum mean square error (MMSE) multiuser decoding, at the base stations. Finally, an efficient layered space-time signaling technique for trellis coded packets, in systems with multisensor transmit-and receive-antennas, as in peer-to-peer communication environments, is proposed. With iterative MMSE decision feedback equalization and multistream decoding, it is observed to deliver significant fractions of the predicted MIMO throughputs.

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Section: Signature-time Diversity In Cdma Uplink Networkmentioning

confidence: 99%

<title>Efficient algorithms for broadband space-time-coded wireless communication</title>

Thomas

2001

SPIE Proceedings

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“…Recently, much work has been done on combining diversity techniques with MUD algorithms [15][16][17]. Some authors like [18] have proposed iterative MUD techniques using error control coding and antenna arrays while in [19] a soft iterative multisensor array receiver for coded MUD CDMA wireless uplink is proposed. Most recently work in [20] investigates the joint DS-CDMA space-time MUD system with error control coding over a multipath fading channel.…”

Section: Introductionmentioning

confidence: 99%

Performance of Turbo Interference Cancellation Receivers in Space-Time Block Coded DS-CDMA Systems

Mashwama

Bejide

2008

J Wireless Com Network

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We investigate the performance of turbo interference cancellation receivers in the space time block coded (STBC) direct-sequence code division multiple access (DS-CDMA) system. Depending on the concatenation scheme used, we divide these receivers into the partitioned approach (PA) and the iterative approach (IA) receivers. The performance of both the PA and IA receivers is evaluated in Rayleigh fading channels for the uplink scenario. Numerical results show that the MMSE front-end turbo space-time iterative approach receiver (IA) effectively combats the mixture of MAI and intersymbol interference (ISI). To further investigate the possible achievable data rates in the turbo interference cancellation receivers, we introduce the puncturing of the turbo code through the use of rate compatible punctured turbo codes (RCPTCs). Simulation results suggest that combining interference cancellation, turbo decoding, STBC, and RCPTC can significantly improve the achievable data rates for a synchronous DS-CDMA system for the uplink in Rayleigh flat fading channels.

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“…Also, Reed and Alexander in [9] have proposed an iterative multiuser detection technique using error control coding and antenna arrays. Following along the same lines, Thomas and Geraniotis in [10] have recently proposed a soft iterative multisensor array receiver for coded multiuser wideband code-division multiple-access wireless uplink. In light of the above, our objective in this paper is to provide both theoretical and simulation results for a practical DS-CDMA system that employs error control coding (i.e., convolutional coding (CC)) and space-time MMSE-MUD over asynchronous multipath fading channels.…”

Section: Introductionmentioning

confidence: 92%

“…= diag[a(1),...,a(M)], Ediag[El, *-, Elp .., -EK1, ., EKp], the block matrix v = IM 0 A/E where 0 denotes the Kronecker product. In this case, the space-time MMSE detector is given by [11] f [N + a2E{ (Z2 })-l -1 (10) where E(x) represents the expected value of x. Similar to the single-path channel case, the optimum decision rule for the mth data bit of the kth user's signal is given by bk(M) = sgn (R{.l' (Ta Dkm }) = sgn (ik(m)) (11) where bkk(r) = R4.k (TY)k}, and (*)kj,m denotes the kj entry of the mth sub-matrix.…”

Section: Introductionmentioning

confidence: 99%

An Error Bound for Space-Time MMSE Multiuser Detection in Coded CDMA Systems over Fading Channels

Hamouda

McLane²

2005 IEEE 16th International Symposium on Personal, Indoor and Mobile Radio Communications

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This paper investigates the use of convolutional coding in space-time minimum mean-square-error (MMSE) multiuser-based receivers over asynchronous multipath Rayleigh fading channels. We focus on the performance gain attained through error control coding when used with Binary-PhaseShift-Keyed modulation (BPSK) and multiuser access based on direct sequence-code-division multiple access (DS-CDMA). In our analysis, we derive an approximation for the uncoded probability of bit-error in multipath fading channels. This biterror rate (BER) approximation is shown to be very accurate when compared to the exact performance. For a convolutionally coded system, we obtain a closed form expression for the biterror rate upper bound. This error bound is noted to be tight as the number of quantization levels increased beyond eight.

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Soft iterative multisensor multiuser detection in coded dispersive CDMA wireless channels

Cited by 16 publications

References 21 publications

<title>Efficient algorithms for broadband space-time-coded wireless communication</title>

<title>Efficient algorithms for broadband space-time-coded wireless communication</title>

Performance of Turbo Interference Cancellation Receivers in Space-Time Block Coded DS-CDMA Systems

An Error Bound for Space-Time MMSE Multiuser Detection in Coded CDMA Systems over Fading Channels

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