DocumentCode :
924851
Title :
Adaptive selection/maximal-ratio combining based on error detection of multidimensional multicode DS-CDMA
Author :
Kim, Dong In
Author_Institution :
Univ. of Seoul, South Korea
Volume :
52
Issue :
3
fYear :
2004
fDate :
3/1/2004 12:00:00 AM
Firstpage :
446
Lastpage :
456
Abstract :
A novel two-dimensional diversity combining is proposed for the uplink in a single cell which employs multidimensional multicode direct-sequence code-division multiple-access signaling and two receive antennas. First, the signaling is combined with precoding to obtain a constant envelope signal that is suitable for the uplink, and the resulting error detection is applied to the diversity combining. Based on the error detection, an adaptive selection-combining/maximal-ratio combining (SC/MRC) is performed, for which initial data detection is made by the SC to avoid the combining loss of the very noisy paths. When the initial SC is unreliable (indicated by the error detection), the MRC is attempted to fully exploit the space and multipath diversity. The adaptive SC/MRC is generalized to further increase the diversity gain over the MRC, offered by the error-detection capability. Through analysis and simulation results, it is shown that the adaptive SC/MRC and its generalized diversity receiver outperforms the other schemes in terms of the symbol-error rate, and also its bit-error rate can be lower than that of the variable spreading factor scheme using a single code.
Keywords :
adaptive antenna arrays; adaptive signal detection; code division multiple access; diversity reception; error detection; error statistics; receiving antennas; spread spectrum communication; telecommunication signalling; BER; adaptive selection; bit-error rate; constant envelop signal; direct sequence code division multiple access; diversity receiver; error detection; initial data detection; maximal ratio combining; multidimensional multicode DS-CDMA; multidimensional signaling; multipath diversity; precoding; receive antennas; two-dimensional diversity combining; variable spreading factor scheme; Bit error rate; Direct-sequence code-division multiple access; Diversity methods; Diversity reception; Fading; Multiaccess communication; Multidimensional systems; Receiving antennas; Signal resolution; Spread spectrum communication;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2004.823628
Filename :
1273695
Link To Document :
بازگشت