Title :
Optimum and Suboptimum Combining of Independent Class-A Noise Channels
Author :
Lai, Stephen W. ; Messier, Geoffrey G.
Author_Institution :
Univ. of Calgary, Calgary, AB, Canada
Abstract :
Optimum and suboptimum combining is investigated for a 2-branch diversity system containing unique Class-A noise in each branch. Expressions for log-likelihood ratio (LLR) reveal that the optimum scheme can be viewed as a linear combiner which is conditioned on the Class-A state. Bit-error rate (BER) performance curves for BPSK demonstrate that use of a saturated Gaussian metric for low-complexity signal combining results in good performance. However, maximal ratio combining (MRC) performs poorly due to mismatch between the MRC LLR and the LLR for optimum schemes.
Keywords :
diversity reception; error statistics; phase shift keying; 2-branch diversity system; BER performance; BPSK; bit-error rate; independent class-A noise channels; linear combiner; log-likelihood ratio; low-complexity signal combining; maximal ratio combining; optimum combining; saturated Gaussian metric; suboptimum combining; AWGN; Binary phase shift keying; Bit error rate; Diversity reception; Measurement; Wireless communication;
Conference_Titel :
Global Telecommunications Conference (GLOBECOM 2011), 2011 IEEE
Conference_Location :
Houston, TX, USA
Print_ISBN :
978-1-4244-9266-4
Electronic_ISBN :
1930-529X
DOI :
10.1109/GLOCOM.2011.6133826
