2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)最新文献

SOVA decoding of concatenated convolutional encoders and CPM scheme over AWGN and fading channels 基于AWGN和衰落信道的串联卷积编码器的SOVA译码和CPM方案

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905792

Manjeet Singh, I. Wassell

{"title":"SOVA decoding of concatenated convolutional encoders and CPM scheme over AWGN and fading channels","authors":"Manjeet Singh, I. Wassell","doi":"10.1109/ICPWC.2000.905792","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905792","url":null,"abstract":"Continuous phase modulation (CPM) is investigated. We employ the decomposed CPM model where the model is decomposed into a continuous phase encoder (CPE) and a memoryless modulator (MM). This allows us to concentrate on the encoding aspects without interference from the modulator. By designing a convolutional channel encoder (CE), to operate over the same algebra as the CPE, the CE and the CPE can be combined and treated in a unified manner. This combination is called an extended CE, as the CPE is effectively an extension of the CE and is a convolutional encoder. In this research, a 1/2 rate CE over the ring of integers modulo 4 is combined with the CPE of a 4-ary CPM scheme whose modulation index is h=1/4. Using this trellis coded modulation design the paper explains the design of a serially concatenated channel coded system, where the inner encoder is the quaternary extended CE and the outer encoder a quaternary convolutional encoder. SOVA decoding is employed. Simulations show that a BER of 2.6/spl times/10/sup -4/ at 0.3 dB SNR is obtainable in an AWGN channel.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"51 22","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120873832","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: 2

Acquisition of frequency synchronization for GSM and its evolution systems GSM及其演进系统的频率同步采集

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905921

U. Jha

{"title":"Acquisition of frequency synchronization for GSM and its evolution systems","authors":"U. Jha","doi":"10.1109/ICPWC.2000.905921","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905921","url":null,"abstract":"In global system for mobile communication (GSM) and its evolution systems (such as general packet radio service, GPRS, and highspeed circuit switched data, HCSD), the cell related parameters are broadcast on a broadcast control channel (BCCH) to facilitate the mobile handsets in the area of coverage to acquire the frequency and timing synchronization as well as to obtain the cell specific parameters. The mobile handset (MS) in the cell needs to scan this BCCH (also known as 'beacon' or 'C/sub o/' channel) to find the strongest receive (Rx) carrier frequency based on the received signal strength. Once the Rx carrier frequency is known, the mobile handset's local oscillator (LO) is tuned to this frequency, which may be offset from the base station (BS) transmit (Tx) carrier frequency based on the specification of the local oscillator and operating environmental condition. The BS transmits periodically a frequency burst (FB) to allow the MS to establish the frequency synchronization with the BS. The characteristic of the FB is such that the received data stream exhibits a tone at 1/4 of the GSM symbol rate. The paper presents a novel approach based on a 2nd order adaptive LMS notch filter for the acquisition of this FB tone. Based on the local oscillator tolerance, the bandwidth of the notch filter is adjusted and the output power of the filter is compared with the received input power. The presence of a FB tone is declared, based on the ratio of the output to the input power of the filter. The threshold for FB detection is based on the signal-to-noise ratio (SNR), probability of detection and probability of false alarm. Once the FB tone is detected the notch filter shifts into the adaptive mode and iteratively converges to the actual FB tone frequency.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121236084","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: 8

Full duplex voice communication handsets over single carrier frequency 单载波频率的全双工话音通信手机

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905825

K. Subramanyam, A. K. Gogoi

引用次数: 1

Adaptive PSP-MLSE receiver for GSM/EDGE system in fast multipath fading channels 快速多径衰落信道下GSM/EDGE系统的自适应PSP-MLSE接收机

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905799

Zhenhong Li, A. Mammela

引用次数: 5

Rate compatible punctured turbo coding for W-CDMA 速率兼容穿孔turbo编码W-CDMA

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905790

Hasung Kim, G. Struber

引用次数: 12

Channel estimation for 3G wideband CDMA systems using the Kalman filtering algorithm 基于卡尔曼滤波算法的3G宽带CDMA信道估计

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905780

K. Shanmugan, M. Sánchez, L. de Haro, M. Calvo

{"title":"Channel estimation for 3G wideband CDMA systems using the Kalman filtering algorithm","authors":"K. Shanmugan, M. Sánchez, L. de Haro, M. Calvo","doi":"10.1109/ICPWC.2000.905780","DOIUrl":"https://doi.org/10.1109/ICPWC.2000.905780","url":null,"abstract":"Many of the signal processing operations in the receivers for 3G CDMA systems depend on accurate estimates of the multipath fading channel. The performance of RAKE receivers and transmit diversity arrangements will degrade significantly if channel estimates are not accurate. Hence, one of the challenges in the design of 3G systems is accurate estimation of the underlying channel characteristics. The first generation of channel estimation algorithms proposed for 3G systems relied on using the pilot symbols. However, it has been shown through simulations that the small number of pilot symbols available for estimation leads to poor estimates, especially in fast fading conditions. In this paper, we introduce a Kalman filter algorithm for channel estimation that combines pilot symbol based estimates with a channel model. We derive an ARMA model for a typical mobile channel with a Jakes Doppler spectrum and use this model to derive the Kalman filtering algorithm. Through simulation and analysis we show that the Kalman filter algorithm reduces the variance of the channel estimate significantly compared to an estimate based on pilot symbols alone.","PeriodicalId":260472,"journal":{"name":"2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116481573","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: 11

Joint blind rate detection and data decoding scheme for CDMA mobile stations in frequency selective Rayleigh fading channels 频率选择瑞利衰落信道CDMA移动站联合盲率检测与数据解码方案

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905858

G. Yang, S. Kallel

引用次数: 4

Demodulation of BFSK signals by adaptive digital notch filtering 自适应数字陷波滤波对BFSK信号的解调

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905806

K. Kadambari, K. V. Rangarao, R. K. Mallik

引用次数: 7

Optimization of spreading code and estimation of channel capacity in multi-code CDMA downlink 多码CDMA下行链路中扩频码优化与信道容量估计

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905864

V.D. Abraham, C. Rao

引用次数: 0

2000 IEEE International Conference on Personal Wireless Communications. Conference Proceedings (Cat. No.00TH8488) Pub Date : 2000-12-17 DOI: 10.1109/ICPWC.2000.905789

R. Rao, Seungsin Lee

引用次数: 2