A Wireless Data Modem for Local Communications

Kaufmann, H.; Küng, Roland

doi:10.1007/978-1-4615-3162-3_8

Cited by 6 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The MMSEC coefficients are given by (22), while those corresponding to the MRC are (32) Similar to [4], the received SNR per bit is used in this work. For an -path channel, the received SNR is given by (33) where is the transmitted signal amplitude of the traffic channel [see (14)]. Fig.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…). Then, the samples are processed by synchronization stages (code acquisition, alignment, and tracking) and by the RAKE fingers (despreaders) [12]- [14]. After the searching process, the output of the th finger at the th instant for the th user is (see Fig.…”

Section: B Rake Receivermentioning

confidence: 99%

“…From [19], represents the psdf of the wide-band signal transmitted from the base station (approximately white within the frequency band of interest). In this work, we assume that and , (i.e., the transmitted signal amplitudes for the same cell-site users are all equal) [2], [15], therefore (14) Using (11), (13), and the fact that the different paths are independent, results in a zero-mean random process with (15) where . From (11) and 15, it can be seen that is caused by the nonorthogonality among user sequences of the same cell, resulting from the presence of multipaths and imperfect chip timing (e.g., if and this interference component is zero).…”

Section: ) Desired Signal Componentmentioning

confidence: 99%

“…Gains of about 4.9 and 1.2 dB over an MRC-RAKE receiver with one and two fingers with RR ( ), respectively, are obtained at an FER of . Equivalently, from (14) it is possible to verify that the total number of users per cell ( ) that can be supported by the forward link is increased from about 5 or 11 (for an MRC-RAKE receiver with one or two branches with RR, respectively) to 15. Note that these important gains are achieved with small additional receiver complexity.…”

Section: Implementation Of the Mmsecmentioning

confidence: 99%

See 3 more Smart Citations

MMSEC-RAKE receivers with resolution reduction of the diversity branches: analysis, simulation, and applications

Hueda

Corral-Briones

Rodriguez

2001

IEEE Trans. Commun.

View full text Add to dashboard Cite

In channels where the delay spread is smaller than the chip interval (e.g., an IS-95 system operating in indoor environments), spread-spectrum signals do not give rise to path diversity. In this situation, maximal-ratio combiner (MRC) RAKE receivers with resolution reduction (RR) of the diversity receiver branches may be used by the mobile stations to provide diversity gain, significantly improving system performance. A new resolution reduction technique based on the use of a minimum mean-square-error diversity combiner (MMSEC) is proposed in this work. We show that, under very general assumptions, this new method of RR is optimal. A detailed study of the performance of a dual-branch MMSEC-RAKE receiver with RR in a typical indoor office environment is presented. In order to allow a simple practical implementation, a suboptimal structure of the MMSEC is also proposed. Numerical results show that this new receiver scheme provides a 1.2-dB improvement over the previously proposed RR technique based on MRC, and a 4.9-dB improvement over conventional MRC-RAKE receiver without RR, at a frame-error rate of 0.01 for the downlink of the IS-95 system in a typical indoor office environment.

show abstract

Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: B Rake Receivermentioning

confidence: 99%

Section: ) Desired Signal Componentmentioning

confidence: 99%

Section: Implementation Of the Mmsecmentioning

confidence: 99%

See 2 more Smart Citations

MMSEC-RAKE receivers with resolution reduction of the diversity branches: analysis, simulation, and applications

Hueda

Corral-Briones

Rodriguez

2001

IEEE Trans. Commun.

View full text Add to dashboard Cite

show abstract

“…The technique constantly chooses a head for the groups and the node with highest remaining energy is chosen. The experimental results reveal that the proposed technique conserves energy greatly by equalizing the energy consumption by all the sensor nodes and prolongs the network lifetime as evaluates with other conventional grouping protocols [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Certain Investigation on Healthcare Monitoring for Enhancing Data Transmission in WSN

Durai

Duraisamy²,

Thirukrishna

2021

Int J Wireless Inf Networks

View full text Add to dashboard Cite

Wireless Sensor Networks are often to perform autonomous sensing and controlling the real world objects through the sensor nodes across the globe. Since these sensor nodes are operated by the energy of the battery that has been performed a vital role in deploying a sensor network. Hence, the battery power needs to be minimized to prolong network lifetime for healthcare applications. The monitored data transmission is very important to process in building wireless sensor networks. In order to provide efficient data transmission wireless technology standards are followed as IEEE 802.15.4 standards that provide desirable communication between end to end with optimal routes using the proposed Energy Optimization Algorithm. The proposed algorithm has been improved the data packet transmission efficiency up to 25% and also helps to prolong the life time of Wireless Sensor Networks in order to achieve the efficient data transmission for health care monitoring.

show abstract

Monolithic integration of a spread-spectrum transmitter and receiver front end for Wireless LAN applications

Baumberger

Kaufmann

1994

Lecture Notes in Computer Science

View full text Add to dashboard Cite

A Wireless Data Modem for Local Communications

Cited by 6 publications

References 3 publications

MMSEC-RAKE receivers with resolution reduction of the diversity branches: analysis, simulation, and applications

MMSEC-RAKE receivers with resolution reduction of the diversity branches: analysis, simulation, and applications

Certain Investigation on Healthcare Monitoring for Enhancing Data Transmission in WSN

Monolithic integration of a spread-spectrum transmitter and receiver front end for Wireless LAN applications

Contact Info

Product

Resources

About