OFDM performance with odd-even quantisation in Cartesian &amp;#x0394;&amp;#x03A3; upconverters

Sirmayanti, Sirmayanti; Bassoo, Vandana; King, Horace; Faulkner, M.

doi:10.1109/icspcs.2012.6507965

Cited by 2 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The research method is based on the analysis results in [2] and technically we use the similar equation derivation (part 2.1) for the reference carrier signal S k (f) as shown in Figure 2 and Figure 3. Later, two scenarios for the odd quantisation [3][4][5][6] scheme and even quantisation [2] scheme are chosen for the comparison results.…”

Section: Methodsmentioning

confidence: 99%

“…PWM/PPM techniques are used to control the amplitude and phase of an RF carrier. But, the rectangular nature of the output pulse generates a number of unwanted harmonics and distortion products such as an image, 3rd harmonic, -3rd harmonic and other low-odd order harmonics [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“… Techniques can shape the noise away from the carrier band for subsequent removal in a band-pass filter [9] and make it suitable for high-precision data acquisition applications [10], but tunability remains a problem [6]. Our previous work in [6], it describes a method of tuning which is particularly suitable for schemes with high-resolution polar quantisers, such as the waveform PWM-mode Cartesian  [3][4][5]. The results recovers much of the dynamic range over the operating band.…”

mentioning

confidence: 99%

“…Figure 1. Cartesian Σ∆ scheme which is applied for baseband tuning scenario and odd quantisation scheme [3][4][5][6].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Analysis Predicted Location of Harmonic Distortion in RF Upconverter Structure

Sirmayanti¹,

Faulkner

2018

TELKOMNIKA

Self Cite

View full text Add to dashboard Cite

A new mathematical analysis to predict the magnitude size of the distortion products from the signal up-conversion process output is presented. The signal up-conversion process converts the digital baseband from the analog baseband into a radio frequency signal. When the signal baseband involves frequency offsetting then occurring a number of distortion products which can reduce the dynamic range so it is difficult to meet the spectrum mask requirements within the operating band. This paper will focus on methods of new mathematical analysis using a continuous frequency range and only applies to a single side band tone, with constant amplitude into any value of frequency offsets. The novel contribution to the analysis starts at generating the gate signal and convolution of the gate signal into the reference carrier signal. The results show very close between the simulation results and the calculation of the predicted location of the distortions.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

“…Figure 1. Cartesian Σ∆ scheme which is applied for baseband tuning scenario and odd quantisation scheme [3][4][5][6].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Analysis Predicted Location of Harmonic Distortion in RF Upconverter Structure

Sirmayanti¹,

Faulkner

2018

TELKOMNIKA

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hasil simulasi dapat dilihat pada Gambar 5, Gambar 6 dan Gambar 7, masing-masing menggunakan parameter OSR=16 dan OSR=8. Karena = (lihat Persamaan (10) dalam [11]) dengan asumsi K=1 maka dapat kita perhatikan kedudukan signal band luaran dari Polar-Q dan RF output duduk di atas satu sama lain atau tepat pada posisi frekuensi target yang sama, meskipun proses melalui offset sejauh 40 dB dari frequency carrier (fc). Proses ini disebut tuning baseband [8], meskipun signal band telah mengalami offset namun posisi band tidak berpengaruh terhadap hasil pergeseran ini.…”

Section: Hasil Dan Pembahasanunclassified

Untitled

Sirmayanti¹

2020

JETT

Self Cite

View full text Add to dashboard Cite

Salah satu mekanisme penting dari sistem digitalisasi pemancar-penerima (Tx-Rx) melalui upconverter RF adalah komputasi solusi yang tepat pada permasalahan harmonic. Penyebab terjadinya harmonic pada spectrum-RF di arsitektur upconverter RF adalah pada proses kuantisasi. Setiap perubahan detak kuantisasi menyebabkan interferensi sehingga muncul unwanted signal pada signal yang ditargetkan. Sejumlah harmonisa muncul juga disebabkan oleh sifat rectangular nature selama proses pulse width/position modulation (PWM/PPM). Untuk mencapai optimalisasi unwanted signal elimination ini, diperlukan selektifitas over sampling ratio (OSR) yang tepat dan teknik ketepatan penggunaan fc terhadap frequency clock (fclock). fclock merupakan factor penentu untuk menetapkan jumlah titik kompleksitas kuantisasi karena terkait keterwakilan level fasa dan amplitude pada signal. Oleh karena itu diperlukan aturan komputasi dalam memprediasi besarnya ukuran produk harmonic tersebut dan solusi eliminasi harmonic yang dimaksudkan.

show abstract

OFDM performance with odd-even quantisation in Cartesian ΔΣ upconverters

Cited by 2 publications

References 7 publications

Analysis Predicted Location of Harmonic Distortion in RF Upconverter Structure

Analysis Predicted Location of Harmonic Distortion in RF Upconverter Structure

Untitled

Contact Info

Product

Resources

About