Optimum Pilot-to-Data Power Ratio for Partial RAKE Receiver in Nakagami-m Fading Channels

被引:0
作者
Jitvanichphaibool, Kommate [1 ]
Saquib, Mohammad [2 ]
Popescu, Otilia [3 ]
机构
[1] Inst Infocom Res I2R, Dept Modulat & Coding, Singapore 138632, Singapore
[2] Univ Texas Dallas, Wireless Commun Res Lab WiCoRe, Richardson, TX 75083 USA
[3] Old Dominion Univ, Dept Elect & Comp Engn, Norfolk, VA 23529 USA
关键词
Pilot-assisted communications; CDMA; multipath; Nakagami-m fading; exponential power delay profile; uniform power delay profile; partial RAKE receiver; SYMBOL ASSISTED MODULATION; DS-CDMA; PERFORMANCE; OPTIMIZATION; PLACEMENT; SYSTEMS; DESIGN; BPSK;
D O I
10.1109/T-WC.2009.070119
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we study the problem of optimizing the pilot-to-data power ratio (PDR) for uplink code-division multiple access (CDMA) systems with partial RAKE (PRAKE) receivers. Both code-division multiplex (CDM) and time-division multiplex (TDM) reference-assisted schemes are considered. We assume Nakagami-m, fading channel with two types of power delay profile (PDP): uniform and exponential PDPs. The optimum PDR is derived via minimizing the upper bound of the probability of bit error. A closed-form expression for the optimum PDR is obtained for both CDM and TDM schemes with uniform PDP. For exponential PDP, we derive the condition satisfied by the optimum PDR and obtain it numerically. It is observed that the optimum PDR is noticeably affected by the decay factor, but not by the m-parameter. For exponential PDP, unlike for uniform PDP, the optimum PDR depends on the number of combined paths. We also show that the optimum PDR derived from the block-fading channel model performs favorably in the Jakes' model.
引用
收藏
页码:136 / 147
页数:12
相关论文
共 24 条
[1]   Optimal placement of training for frequency-selective block-fading channels [J].
Adireddy, S ;
Tong, L ;
Viswanathan, H .
IEEE TRANSACTIONS ON INFORMATION THEORY, 2002, 48 (08) :2338-2353
[2]  
[Anonymous], 2002, Wireless Communications: Principles and Practice
[3]  
[Anonymous], 2004, Probability and Stochastic Process
[4]  
[Anonymous], 1991, ELEMENTS INFORM THEO
[5]   Design of a multiband OFDM system for realistic UWB channel environments [J].
Batra, A ;
Balakrishnan, J ;
Aiello, GR ;
Foerster, JR ;
Dabak, A .
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2004, 52 (09) :2123-2138
[6]  
Cassioli D, 2002, IEEE J SEL AREA COMM, V20, P1247, DOI [10.1109/JSAC.2002.801228, 10.1109/JSAC.2002.801228.]
[7]   AN ANALYSIS OF PILOT SYMBOL ASSISTED MODULATION FOR RAYLEIGH FADING CHANNELS [J].
CAVERS, JK .
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, 1991, 40 (04) :686-693
[8]   PILOT SYMBOL ASSISTED MODULATION AND DIFFERENTIAL DETECTION IN FADING AND DELAY SPREAD [J].
CAVERS, JK .
IEEE TRANSACTIONS ON COMMUNICATIONS, 1995, 43 (07) :2206-2212
[9]   The 3GPP proposal for IMT-2000 [J].
Chaudhury, P ;
Mohr, W ;
Onoe, S .
IEEE COMMUNICATIONS MAGAZINE, 1999, 37 (12) :72-81
[10]   Optimal insertion of pilot symbols for transmissions over time-varying flat fading channels [J].
Dong, M ;
Tong, L ;
Sadler, BM .
IEEE TRANSACTIONS ON SIGNAL PROCESSING, 2004, 52 (05) :1403-1418