Abstract
Abstract In this paper, we propose an efficient scheme for side peak cancelation in binary offset carrier (m,n) (BOC(m,n)) with integer modulation order. The proposed scheme reduces significantly the width of the main peak of the auto-correlation function (ACF) and thus the range of influence of the multipath (MP) in BOC-modulated signals. It is based on the use of reference ACFs like that of ideal pseudo random noise (PRN) code generated by linear feedback shift register (LFSR) and used in global positioning system (GPS) and the Russian Globalnaya Navigatsionnaya Sputnikovaya Sistema (GLONASS). In MP environment, the proposed method is used in combination with fast iterative maximum likelihood algorithm (FIMLA) that is adapted to future modernized GPS and Galileo signals. As a result, the obtained ACF of the proposed scheme does not contain any side peaks, and thus, the discriminator function (DF) has no ambiguity in the delay-locked loop (DLL) code tracking operation. The simulation results show that the proposed technique has superior performances in MP mitigation and permits the same resistance to noise compared to the traditional techniques.
Highlights
Binary offset carrier (BOC) modulation is well known by its symmetric split power spectrum with two main lobes shifted from the carrier frequency by an amount equal to the sub-carrier frequency and with a null at the carrier frequency [1]
The first one [10], which is applied for CBOC modulation signal in non-coherent tracking configuration, uses a discriminator based on a pseudo correlation function (PCF)
Since the resultant autocorrelation function (ACF) has no side peaks, the proposed technique can be combined with all the proposed methods used for MP mitigation in classical global positioning system (GPS) codes, such as high-resolution correlator (HRC) [21], multipath estimating delay-locked loop (DLL) (MEDLL) [22], and the virtual MP mitigation technique (VMMT) [23], in order to improve its performances in the presence of MPs
Summary
Binary offset carrier (BOC) modulation is well known by its symmetric split power spectrum with two main lobes shifted from the carrier frequency by an amount equal to the sub-carrier frequency and with a null at the carrier frequency [1]. There is a method based on the concept of s-curve shaping for alternative BOC (AltBOC)-modulated signal, presented in [19] It shows better performance in terms of MP and side peak reduction than the conventional receiver ACF techniques, it is limited by the noise. Since the resultant ACF has no side peaks, the proposed technique can be combined with all the proposed methods used for MP mitigation in classical GPS codes, such as high-resolution correlator (HRC) [21], multipath estimating DLL (MEDLL) [22], and the virtual MP mitigation technique (VMMT) [23], in order to improve its performances in the presence of MPs. The paper is organized as follows: we start with a description of the ACFs of BOC-modulated signals followed by a presentation of the side peak ambiguity problem. The DLL can lock on a side peak which creates deep ambiguities around the central peak of the ACF (into the range of ±1 chips)
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