48 research outputs found
On the Performance of Mismatched Data Detection in Large MIMO Systems
We investigate the performance of mismatched data detection in large
multiple-input multiple-output (MIMO) systems, where the prior distribution of
the transmit signal used in the data detector differs from the true prior. To
minimize the performance loss caused by this prior mismatch, we include a
tuning stage into our recently-proposed large MIMO approximate message passing
(LAMA) algorithm, which allows us to develop mismatched LAMA algorithms with
optimal as well as sub-optimal tuning. We show that carefully-selected priors
often enable simpler and computationally more efficient algorithms compared to
LAMA with the true prior while achieving near-optimal performance. A
performance analysis of our algorithms for a Gaussian prior and a uniform prior
within a hypercube covering the QAM constellation recovers classical and recent
results on linear and non-linear MIMO data detection, respectively.Comment: Will be presented at the 2016 IEEE International Symposium on
Information Theor
ΠΠΠΠΠΠΠΠ Π‘Π£ΠΠΠΠ ΠΠΠΠΠΠ Π‘ΠΠΠΠΠΠΠ Π ΠΠΠΠΠ ΠΠΠ©ΠΠΠ‘Π’Π, ΠΠΠ ΠΠΠΠΠΠΠΠ«Π₯ ΠΠΠ‘Π ΠΠΠ‘Π’ΠΠΠ ΠΠΠΠΠ©ΠΠΠΠΠΠ ΠΠΠΠΠΠ Π‘ΠΠ―ΠΠ Π‘ ΠΠΠΠΠ ΠΠΠΠ―ΠΠ
We suggest the alternative approach based on definition of the moment generating function for the average signal-to-noise ratio (SNR) at the receiver output with the purpose to analyze performance of systems with equal gain combining over Nakagami-n (Rice) and Nakagami-q (Hoyt) fading channels under consideration of land, mobile and satellite telecommunication systems. We derive the exact closed-form mathematical expressions for average symbol error probability and outage probability using the Pade rational approximation to moment generating function of the SNR at the output of the combiner. We investigate the following important receiver performance such as the average SNR at the receiver output, fading, spectral effectiveness at weak input signals. Additionally, we study the rational Pade approximation of the moment generating function applying to the average SNR at the receiver output and evaluate bit error rate and the outage probability. Additionally, we investigate a possibility of modeling a Hoyt fading channel based on presentation Nakagami-m statistical model for evaluation of error performance under the use of equal gain combining technique.Β Π£ΡΠΈΡΡΠ²Π°Ρ Π²Π°ΠΆΠ½ΠΎΡΡΡ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ, ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΠΌΡΡ
ΠΏΡΠΈ ΠΎΠΏΠΈΡΠ°Π½ΠΈΠΈ ΠΊΠ°Π½Π°Π»Π° ΡΠ²ΡΠ·ΠΈ Ρ Π·Π°ΠΌΠΈΡΠ°Π½ΠΈΡΠΌΠΈ, ΠΏΠΎΠ΄ΡΠΈΠ½ΡΡΡΠΈΠΌΠΈΡΡ ΡΠ°ΠΊΠΈΠΌ Π·Π°ΠΊΠΎΠ½Π°ΠΌ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ, ΠΊΠ°ΠΊ ΠΠ°ΠΊΠ°Π³Π°ΠΌΠΈ-n (ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Π Π°ΠΉΡΠ°) ΠΈ ΠΠ°ΠΊΠ°Π³Π°ΠΌΠΈ-q (ΡΠ°Ρ- ΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Π₯ΠΎΠΉΡΠ°), ΠΏΡΠΈ ΡΠ°ΡΡΠΌΠΎΡΡΠ΅Π½ΠΈΠΈ Π½Π°Π·Π΅ΠΌΠ½ΡΡ
, ΠΌΠΎΠ±ΠΈΠ»ΡΠ½ΡΡ
ΠΈ ΡΠΏΡΡΠ½ΠΈΠΊΠΎΠ²ΡΡ
ΡΠ΅Π»Π΅ΠΊΠΎΠΌΠΌΡΠ½ΠΈΠΊΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ, ΠΌΡ ΠΏΡΠ΅Π΄ΡΡΠ°Π²Π»ΡΠ΅ΠΌ Π°Π»ΡΡΠ΅ΡΠ½Π°ΡΠΈΠ²Π½ΡΠΉ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄, ΠΎΡΠ½ΠΎΠ²Π°Π½Π½ΡΠΉ Π½Π° ΠΌΠΎΠΌΠ΅Π½ΡΠ½ΡΡ
ΡΡΠ½ΠΊΡΠΈΡΡ
, Π΄Π»Ρ Π°Π½Π°Π»ΠΈΠ·Π° Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΡΠΈΠ΅ΠΌΠ½ΡΡ
ΡΡΡΡΠΎΠΉΡΡΠ² Ρ Π»ΠΈΠ½Π΅ΠΉΠ½ΡΠΌ ΡΡΠΌΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² ΡΠ°Π²Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ, ΠΏΠ΅ΡΠ΅Π΄Π°Π²Π°Π΅ΠΌΡΡ
ΠΏΠΎΡΡΠ΅Π΄ΡΡΠ²ΠΎΠΌ ΠΊΠ°Π½Π°Π»ΠΎΠ² ΡΠ²ΡΠ·ΠΈ Ρ Π·Π°ΠΌΠΈΡΠ°Π½ΠΈΡΠΌΠΈ, ΠΊΠΎΡΠΎΡΡΠ΅ ΡΠ²Π»ΡΡΡΡΡ Π½Π΅Π·Π°Π²ΠΈΡΠΈΠΌΡΠΌΠΈ, Π½ΠΎ Π½Π΅ΠΎΠ±ΡΠ·Π°ΡΠ΅Π»ΡΠ½ΠΎ ΠΈΠ΄Π΅Π½ΡΠΈΡΠ½ΠΎ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΡΠΌΠΈ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ Π·Π°ΠΊΠΎΠ½Π°ΠΌΠΈ Π Π°ΠΉΡΠ° ΠΈ Π₯ΠΎΠΉΡΠ°. ΠΠΎΠ»ΡΡΠ΅Π½Ρ ΡΠΎΡΠ½ΡΠ΅ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ Π΄Π»Ρ ΠΌΠΎΠΌΠ΅Π½ΡΠ½ΡΡ
ΡΡΠ½ΠΊΡΠΈΠΉ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»/ΠΏΠΎΠΌΠ΅Ρ
Π° Π½Π° Π²ΡΡ
ΠΎΠ΄Π΅ ΡΡΠΌΠΌΠ°ΡΠΎΡΠ° ΠΏΡΠΈΠ΅ΠΌΠ½ΠΎΠ³ΠΎ ΡΡΡΡΠΎΠΉΡΡΠ²Π°. ΠΡΡΠ»Π΅Π΄ΡΡΡΡΡ Π²Π°ΠΆΠ½ΡΠ΅ ΠΊΡΠΈΡΠ΅ΡΠΈΠΈ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΠΏΡΠΈΠ΅ΠΌΠ½Π³ΠΎ ΡΡΡΡΠΎΠΉΡΡΠ²Π°, ΡΠ°ΠΊΠΈΠ΅ ΠΊΠ°ΠΊ ΡΡΠ΅Π΄Π½Π΅Π΅ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΡΠΈΠ³Π½Π°Π»/ΠΏΠΎΠΌΠ΅Ρ
Π° Π½Π° Π²ΡΡ
ΠΎΠ΄Π΅ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΎΠ³ΠΎ ΡΡΡΡΠΎΠΉΡΡΠ²Π°, ΡΡΠ΅ΠΏΠ΅Π½Ρ Π·Π°ΠΌΠΈΡΠ°Π½ΠΈΠΉ, ΡΠΏΠ΅ΠΊΡΡΠ°Π»ΡΠ½Π°Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ Π² ΡΠ΅ΠΆΠΈΠΌΠ΅ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² ΠΌΠ°Π»ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ. ΠΡΠΎΠΌΠ΅ ΡΠΎΠ³ΠΎ, ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡ ΡΠ°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ Π°ΠΏΠΏΡΠΎΠΊΡΠΈΠΌΠ°ΡΠΈΡ ΠΠ°Π΄Π΅, ΡΠΎ Π΅ΡΡΡ Π½Π°ΠΈΠ»ΡΡΡΡΡ ΡΠ°ΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΡ Π°ΠΏΠΏΡΠΎΠΊΡΠΈΠΌΠ°ΡΠΈΡ ΡΡΠ΅ΠΏΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΡΠ΄Π°, ΠΏΡΠΈΠΌΠ΅Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΊ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ΅ΠΉ ΡΡΠ½ΠΊΡΠΈΠΈ ΠΌΠΎΠΌΠ΅Π½ΡΠΎΠ² ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»/ΠΏΠΎΠΌΠ΅Ρ
Π° Π½Π° Π²ΡΡ
ΠΎΠ΄Π΅ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΎΠ³ΠΎ ΡΡΡΡΠΎΠΉΡΡΠ²Π°, ΠΎΡΠ΅Π½ΠΈΠ²Π°ΡΡΡΡ ΡΡΠ΅Π΄Π½ΡΡ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΡ ΠΎΡΠΈΠ±ΠΎΠΊ Π½Π° ΡΠΈΠΌΠ²ΠΎΠ» ΠΈ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΡ Π½Π°ΡΡΡΠ΅Π½ΠΈΡ ΡΠ²ΡΠ·ΠΈ. ΠΡ ΡΠ°ΠΊΠΆΠ΅ ΠΈΡΡΠ»Π΅Π΄ΡΠ΅ΠΌ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π·Π°ΠΌΠΈΡΠ°Π½ΠΈΠΉ Π² ΠΊΠ°Π½Π°Π»Π΅ ΡΠ²ΡΠ·ΠΈ, ΠΎΠΏΠΈΡΡΠ²Π°Π΅ΠΌΡΡ
ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ΠΌ Π₯ΠΎΠΉΡΠ°, Ρ ΠΏΠΎΠΌΠΎΡΡΡ Π²ΡΠ±ΡΠ°Π½Π½ΠΎΠΉ Π΄ΠΎΠ»ΠΆΠ½ΡΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΠ°ΠΊΠ°Π³Π°ΠΌΠΈ-m ΠΏΡΠΈ ΡΡΠ»ΠΎΠ²ΠΈΠΈ, ΡΡΠΎ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ ΠΏΠΎΠΌΠ΅Ρ
ΠΎΠ·Π°ΡΠΈΡΠ΅Π½Π½ΠΎΡΡΡ, ΠΈΠ»ΠΈ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½Ρ ΠΎΡΠΈΠ±ΠΎΠΊ ΠΏΡΠΈΠ΅ΠΌΠ½ΠΎΠ³ΠΎ ΡΡΡΡΠΎΠΉΡΡΠ²Π° ΠΏΡΠΈ Π»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΌ ΡΡΠΌΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² ΡΠ°Π²Π½ΠΎΠΉ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ.
Spectral efficiency and optimal medium access control of random access systems over large random spreading CDMA
This paper analyzes the spectral efficiency as a function of medium access
control (MAC) for large random spreading CDMA random access systems that employ
a linear receiver. It is shown that located at higher than the physical layer,
MAC along with spreading and power allocation can effectively perform spectral
efficiency maximization and near-far mitigation.Comment: To appear in IEEE Trans. on Communication