Abstract
Building on the recent developments in the performance analysis of generalized selection combining (GSC), this paper examines the optimum spreading bandwidth for a fixed-complexity GSC diversity receiver operating over independent identically distributed Rayleigh paths. For this purpose, the study considers three performance criteria: 1) average combined signal-to-noise ratio (SNR) at the GSC output; 2) average bit error probability (BEP); and 3) outage probability of the instantaneous combined SNR at the GSC output. For the average BEP criterion, results are presented for both coherent and noncoherent combining. For the average combined SNR and some instances of the average BEP optimization problem, an accurate approximate estimate of this optimum bandwidth in the form of a solution of a transendental equation is provided. In other cases, where the optimization is not easily tractable in an analytic fashion, a numeric-search procedure is used to find this optimum bandwidth for different performance criteria and system parameters of interest. Finally, simplified rule-of-thumb-type formulas are also presented as a good reference for picking the optimum spreading bandwidth given a set of system parameters and a particular performance criterion of interest.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1080-1089 |
| Number of pages | 10 |
| Journal | IEEE Journal on Selected Areas in Communications |
| Volume | 19 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2001 |
| Externally published | Yes |
Keywords
- Diversity combining
- Generalized selection combining
- Hybrid SC/MRC
- Maximal ratio combining
- RAKE reception
- Rayleigh fading
- Selection combining
- Spreading bandwidth
- Ultrawideband radio
ASJC Scopus subject areas
- Computer Networks and Communications
- Electrical and Electronic Engineering