The Effects of Ordering Criteria in Linear Successive Interference Cancellation in CDMA Systems

Mohammad, M.; Buehrer, R. Michael

doi:10.1109/t-wc.2008.070664

Cited by 12 publications

(14 citation statements)

References 11 publications

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“…Note that although a real SIC implementation always proceeds in decreasing order of received powers [8], this constraint is obviated understanding that the solution profile E s (t) will be non-increasing in 0  t  t 0 . This is validated a posteriori in Section IV.…”

Section: Energy Allocation Designmentioning

confidence: 99%

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Channel-Aware Energy Allocation for Throughput Maximization in Massive Low-Rate Multiple Access

Molina

Sala-Alvarez

Micolau

et al. 2019

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

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A multiple access (MA) optimization technique for massive low-rate direct-sequence spread spectrum communications is analyzed in this work. A dense network of users transmitting at the same rate to a common central node under channelaware energy allocation is evaluated. At reception, successive interference cancellation (SIC) aided by channel decoding is adopted. Our contribution focuses on wireless scenarios involving a vast number of users for which the provided user-asymptotic model holds. Variational calculus (VC) is employed to derive the energy allocation function that, via user-power imbalance, maximizes the network spectral efficiency (SE) when perfect channel state information at transmission (CSIT) is available and both average and maximum per-user energy constraints are set. Monte Carlo simulations at chip-level of a SIC receiver using a real decoder assess the proposed optimization method.

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Section: Energy Allocation Designmentioning

confidence: 99%

“…In that respect, system performance strongly depends on the decoder's packet error rate (PER) characteristic. Soft feedback SIC, where the correlator's output is used to perform cancellation, is employed in [8], [9]. This is sometimes inaccurate since estimation errors are propagated along SIC stages.…”

Section: Introductionmentioning

confidence: 99%

Channel-Aware Energy Allocation for Throughput Maximization in Massive Low-Rate Multiple Access

Molina

Sala-Alvarez

Micolau

et al. 2019

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

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“…The problem of adjusting decoding orders to minimize the total transmission power of users has been considered in [14][15][16][17][18]. In [14,15], the authors suggest decoding users in descending order of channel gains to minimize the total transmission power of users.…”

Section: Introductionmentioning

confidence: 99%

“…In [16], Berggren et al consider the case of imperfect SIC and suggest decoding users in descending order of channel gains to minimize the total transmission power of users under the single rate system. In [17,18], the authors focus on the multi-rate system with imperfect SIC and find that the optimal decoding order of minimizing the total transmission power is a function of users' signal-to-interference-plus-noise ratio (SINR) requirements and channel gains. But they have not explicitly derived the optimal decoding order.…”

Section: Introductionmentioning

confidence: 99%

On feasibility examination of DS‐CDMA systems with imperfect successive interference cancellation

Zhou

Feng

Zhang

et al. 2010

Int J Communication

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SUMMARYIn DS-CDMA systems with the successive interference cancellation (SIC) technique, there are K ! possible decoding orders for K active users and the decoding order has considerable impact on system performance. Once the constraints on the received powers of mobile stations and the bit-energy-to-interference-powerspectral-density ratio requirements are satisfied under some decoding order of SIC, the system is feasible. Otherwise, if the constraints are violated under all possible decoding orders, the system is infeasible. It is highly time-consuming to examine the system feasibility directly by using the usual exhaustive search method (ESM) for a system with even moderate number of users. In this paper, we propose an efficient approach for examining the feasibility of DS-CDMA systems with imperfect SIC. The proposed approach has significantly lower computational complexity than that of ESM and thus benefits the quick decisions of admission control and/or scheduling, which are essential for Quality of Service provisioning in DS-CDMA systems. Furthermore, we theoretically prove that the system under the resultant decoding order obtained by the proposed approach is able to achieve the lowest outage probability among all possible decoding orders. We conduct extensive simulation experiments, and the numerical results validate our analysis and demonstrate the effectiveness of our approach.

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“…It was shown in [4] that, although the proposed equalizers can lower the error floor caused by MUI, a performance degradation compared to an ideal synchronous system still exists, even when error correcting codes are applied. Successive interference cancellation (SIC) is an effective MUI mitigation technique that has received considerable attention in conventional multiple access systems such as direct sequence code division multiple access (DS-CDMA) systems [5][6][7][8][9][10][11][12][13][14]. However, a BS-CDMA system is different from a DS-CDMA system in the sense that while 2 EURASIP Journal on Advances in Signal Processing a DS-CDMA system spreads each symbol from a particular user by using a user-specific spreading code, a BS-CDMA system spreads a block of precoded symbols with such a spreading code.…”

Section: Introductionmentioning

confidence: 99%

Iterative Successive Interference Cancellation for Quasi-Synchronous Block Spread CDMA Based on the Orders of the Times of Arrival

Wang

Bocus

Coon

2010

EURASIP J. Adv. Signal Process.

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Recently, a block spreading code division multiple access (BS-CDMA) technique was presented, whereby user-specific precoding along with orthogonal spreading codes is used to achieve multiuser interference-(MUI-) free reception when all users arrive at the base station simultaneously. In practice, however, imperfect synchronization destroys the orthogonality among users, and MUI occurs. To mitigate the MUI in BS-CDMA due to quasisynchronous reception, this paper proposes an iterative successive interference cancellation (SIC) receiver, where cancellation of interfering signals is ordered according to the times of arrival (TOA) of the signals from different users. The ordering criterion is justified through analysis and simulation on the average signal-tointerference-plus-noise ratio (SINR) of different users, where it is shown that in a quasisynchronous BS-CDMA system, ordering with regard to increasing TOA is equivalent to ordering with respect to decreasing average SINR, when practical channels such as the exponentially decaying channel is considered. The proposed SIC receiver is shown to achieve a performance close to a system with synchronous reception for only two iterations. In addition, an algorithm to determine the detection order of different blocks is proposed such that parallel detection of the signals from different users with reduced latency can be achieved.

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The Effects of Ordering Criteria in Linear Successive Interference Cancellation in CDMA Systems

Cited by 12 publications

References 11 publications

Channel-Aware Energy Allocation for Throughput Maximization in Massive Low-Rate Multiple Access

Channel-Aware Energy Allocation for Throughput Maximization in Massive Low-Rate Multiple Access

On feasibility examination of DS‐CDMA systems with imperfect successive interference cancellation

Iterative Successive Interference Cancellation for Quasi-Synchronous Block Spread CDMA Based on the Orders of the Times of Arrival

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