Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)最新文献_第7页

Fast acquisition PLL synthesizer using parallel N-stage cycle swallower (NSCS) 基于并行n级周期吞入器(NSCS)的快速采集锁相环合成器

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379565

T. Saba, D. Park, S. Mori

引用次数: 2

Block demodulation-an overview 块解调——概述

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379618

E. Biglieri, E. Bogani, M. Visintin

引用次数: 8

Signal design for approximately synchronized CDMA system without co-channel interference using pseudo-periodic sequences 基于伪周期序列的无同信道干扰的近似同步CDMA系统信号设计

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379552

N. Suehiro

引用次数: 24

A signal processing ASIC for an all digital spread spectrum modem for power line communications 用于电力线通信的全数字扩频调制解调器的信号处理专用集成电路

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379564

K. Dostert

{"title":"A signal processing ASIC for an all digital spread spectrum modem for power line communications","authors":"K. Dostert","doi":"10.1109/ISSSTA.1994.379564","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379564","url":null,"abstract":"Through the use of spread spectrum techniques low voltage electrical power distribution networks become reliable and universal digital data links. After a short review of appropriate signalling schemes the paper will outline the basic ideas leading to the construction of an ASIC. It is shown that this step has to be taken because the use of general purpose digital signal processors (DSP) is neither feasible nor cost-effective. The design of the transmitter section into an ASIC is relatively easy. An inexpensive counter with a reset-to-zero feature operates as the core element for precise and fast signal synthesis. Signal selection and timing control are performed by an on-board microcontroller. The solution for receiver signal processing is more complicated. A fast signal processing front end is needed which does correlation operations based on a MAC structure (multiply and accumulate). The mentioned on-board microcontroller performs bit decision, serial data transfer as well as timing and control functions. Investigations revealed that a word length of 8 bit is sufficient in the transmitter as well as in the receiver section of a typical power line modem. Finally the ASIC has to contain the following functional blocks: an 8 bit MAC unit with at least four separate 32 bit accumulators, a microcontroller interface, a 9 bit programmable counter, and a clocking and control unit. ASICs according to the outlined scheme were designed and fabricated in spring 1993 using a 0.8 /spl mu/m BiCMOS full custom process. Testing revealed a power consumption of less than 5 mW at the full operating speed of 12 MHz. Half-duplex modems are under construction with different signalling schemes for data rates up to 2400 bits/s. First measurements revealed a bit error rate at typical indoor installations in the range of 10/sup -5/. Further work will concentrate on outdoor applications such as remote meter reading as well as control and supervision of consumer's premises.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125537576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Impact of the direct sequence spread spectrum signals from the global satellite navigation system GLONASS on radio astronomy: problem and proposed solution 全球卫星导航系统GLONASS直接序列扩频信号对射电天文学的影响:问题及解决方案

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379558

J. Ponsonby

{"title":"Impact of the direct sequence spread spectrum signals from the global satellite navigation system GLONASS on radio astronomy: problem and proposed solution","authors":"J. Ponsonby","doi":"10.1109/ISSSTA.1994.379558","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379558","url":null,"abstract":"The GLONASS satellites use direct sequence spread spectrum with a P-code chip rate of 5.11 MHz. On their L1 channels near 1600 MHz they also carry a 0.511 MHz chip rate C/A-code. The satellites are distinguished by FDMA having carrier frequencies spaced 0.5625 MHz apart. The digital code sequences are used directly to switch the phase of the carriers. This results in an emitted power spectrum of envelope which falls off only as (frequency from the carrier)/sup -2/. This allows the signals to be seen more than /spl plusmn/80 MHz from the carriers. As a result GLONASS is causing unacceptable interference to radio astronomy in the band 1660-1670 MHz and devastating interference in the band 1610.6-1613.8 MHz which was allocated PRIMARY to the radio astronomy service (RAS) at WARC-92. The problem is to achieve EMC between the RAS and GLONASS. It is proposed that one measure to mitigate the impact of GLONASS should be for it to adopt a form of continuous phase modulation (CPM) which would result in its side-bands falling off as (frequency from carrier)/sup -6/. A novel \"proof-of-concept\" 1/100th (in frequency) scale model modulator has been constructed in hardware which produces a simulated GLONASS CPM signal with this property. This type of modulator could find service with other DSSS systems.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127531063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Novel magic-square codes for hiding DS/SS signals from intercept receivers 用于隐藏拦截接收机的DS/SS信号的新型魔方码

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379538

P. Hill, A.M.S. Haisan

引用次数: 1

A unified approach to time diversity combining for fast frequency hopped NCMFSK 快速跳频NCMFSK时分集的统一组合方法

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379573

T. Gulliver, E. Felstead, R. Ezers, J. S. Wight

引用次数: 4

Performance of multistage detector with one-shot decorrelating type first stage in an asynchronous DS/CDMA system 异步DS/CDMA系统中一次解相关型多级检测器的性能

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379604

M. Juntti

引用次数: 2

An interference suppressor for CW and narrow-band signals using filter bank on CDMA communications 在CDMA通信中利用滤波器组对连续波和窄带信号进行干扰抑制

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379531

T. Kohri

{"title":"An interference suppressor for CW and narrow-band signals using filter bank on CDMA communications","authors":"T. Kohri","doi":"10.1109/ISSSTA.1994.379531","DOIUrl":"https://doi.org/10.1109/ISSSTA.1994.379531","url":null,"abstract":"A novel digital interference suppression method based on Fourier transform has been proposed. Since the frequency power spectrum of CW and narrow band interference signals are larger than that of the spread-spectrum signal, these interference signals can be reduced by limiting the signal level in the frequency domain. The proposed method is composed of FDM/TDM transform using a filter bank and an amplitude limiter adjusted to the spectrum of the spread-spectrum signal. The received signals are divided into separate narrow frequency bands in real time using a frequency function and the amplitude of these signals is limited. This signal processing reduces the interference signals. This paper describes the principle design of the transform circuit and explains the optimum limiting technique. In particular, the proposed digital processing model is compared with the analog processing model which has already been reported. In addition, the adjustment level of the amplitude limiter for the DS and FH spread-spectrum signal is shown. Finally, the improvement in interference suppression using FFT and the optimum limiting limiter is demonstrated with measured the eye pattern of the correlated signal. The performance of this suppressor is shown by measuring the bit error rate in the presence of CW interference signals and Gaussian noise.<<ETX>>","PeriodicalId":158358,"journal":{"name":"Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128423409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Bit error probability for an adaptive diversity receiver in a Rayleigh fading channel 瑞利衰落信道中自适应分集接收机的误码概率

Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94) Pub Date : 1994-07-04 DOI: 10.1109/ISSSTA.1994.379545

V. Kaasila, A. Mammela

引用次数: 2