Wireless network access for personal communications

Cox, D.C.

doi:10.1109/35.210361

Cited by 145 publications

(20 citation statements)

References 42 publications

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“…In acoustically noisy environments, i.e., in noisy rooms or vehicles or along noisy streets, the speech compression techniques convert noise into strange speechlike sounds that are subjectively annoying. Tandeming speech coding [7,20] and errors in transmission further degrade the already poor quality speech. After years of touting "near toll quality" for their 8-kb/s speech, advocates of CDMA for cellular and high-tier PCS have recently changed to speech encoding at about 14 kb/s to attempt to make their speech quality acceptable!…”

Section: Required Attributes Of Low-power Wireless Loopsmentioning

confidence: 99%

“…The resulting distortion in the 8-kb/s digital speech yields mean opinion scores (MOS) on the order of 3.2 in acoustically quiet environments compared to the MOS of 4.1 for 32-kb/s ADPCM, which is required for users to judge the speech good [7]. In acoustically noisy environments, i.e., in noisy rooms or vehicles or along noisy streets, the speech compression techniques convert noise into strange speechlike sounds that are subjectively annoying.…”

Section: Required Attributes Of Low-power Wireless Loopsmentioning

confidence: 99%

“…It is proposed that management of the radio links and of the mobility of wireless users be done using intelligence in the networks. The wireless technology and system proposed [7,11,15,20,32] for this wireless loop application are aimed at providing the benefits of cordless telephones without having their mobility limitations, and, in addition, at providing moderate-rate data, and solving the wireless privacy issue by encrypting the digital radio links. New encryption techniques compatible with low-complexity handsets have been evolved to provide the proposed privacy [33,34].…”

Section: Low-power Digital Radio As a Ubiquitous Wireless Subscriber mentioning

confidence: 99%

“…Also, no existing or proposed digital cellular technology can provide the high wireline speech quality of 32 kb/s ADPCM while operating in acoustically noisy environments. 5 The PACS wireless loop technology [7,20,32] has a wireless link format and protocols that will support speech transmission rates of 8 kb/s and 16 kb/s as well as 32 kb/s. However, the need for high speech quality and low complexity drives initial implementation to 32 kb/s.…”

Section: Required Attributes Of Low-power Wireless Loopsmentioning

confidence: 99%

“…2 b. The use of specially designed point-to-multipoint radio technology to provide fixed telephone service to rural subscribers in sparsely populated regions [4] and to subscribers in urban and suburban areas c. The use of specially designed wideband pointto-multipoint microwave and millimeter-wave technology ("wireless cable") to distribute television and video services to fixed subscribers [5] d. The use of specially designed digital cordless telephones to provide wireless PBX and wireless CENTREX services to large businesses [6][7][8] e. Variations on the original proposal [1, 2] to use low-power digital radio for the last 1000 ft or so of a telephone or data loop [7,[9][10][11][12][13][14][15][16][17] After reviewing a "telephone" loop, we briefly discuss the first four wireless loop applications noted above, and then finish with a discussion of application (e) and its relationship to personal communications systems (PCS), both low-tier and high-tier [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Wireless loops: What are they?

Cox

1996

Int J Wireless Inf Networks

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Several loop applications of wireless technology are aimed at reducing the cost of deploying communications services ranging from telephone to wideband video. In these applications, wireless links replace a portion of a wireline loop from a central location (a central office or cable headend) to a subscriber. The replacement of labor-intensive wireline technology by complex mass-produced integrated electronics in wireless transceivers is projected to reduce the overall cost of the resulting loop. These wireless loop applications attempt to provide existing communications services or small modifications to existing communications services. A different interpretation of a wireless loop makes use of low-power digital radio technology to provide the last thousand feet or so of a loop. Low-power low-complexity wireless loop technology in small base units can be integrated with network intelligence to provide the fixed-infrastructure network needed to support economical personal communications services (PCS) to small, lightweight, low-power personal voice and/or data communicators. Low-complexity communicators can provide many hours of "talk time" or data transmission time and perhaps several days of standby time from small batteries (< 1.5 oz). Because this application of wireless loop technology can reduce the inherent costs in several parts of a wireline loop, it has the potential to provide convenient widespread PCS at less costs than providing telephone services over conventional wireline loops. This low-power wireless loop application does not fit into any existing communications system paradigm. Wireless technology with tetherless access and wide-ranging mobility, e.g., the personal access communications system (PACS), does not fit the accumulated wisdom of the wireline telephony paradigm. It also does not fit the paradigm of existing cellular radio that has sparsely distributed expensive cell sites, and it is not targeted at fixed video services as is wireless cable. Because a significant change in thinking is required in addressing this new low-power low-complexity widespread wireless loop paradigm, its large economic advantages and service benefits have not yet been embraced by many of the existing communications providers, who appear to be more comfortable pursuing the better-known paradigms of video using wireless cable, or of cellular radio in the guise of high-tier PCS, or in the guise of rapid economical deployment of telephone services in developing nations. This paper discusses the inherent economic advantages and service benefits of low-power low-complexity wireless loop technology integrated with network intelligence aimed at providing economical low-tier PCS to everyone.

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Section: Required Attributes Of Low-power Wireless Loopsmentioning

confidence: 99%

Section: Required Attributes Of Low-power Wireless Loopsmentioning

confidence: 99%

Section: Low-power Digital Radio As a Ubiquitous Wireless Subscriber mentioning

confidence: 99%

Section: Required Attributes Of Low-power Wireless Loopsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wireless loops: What are they?

Cox

1996

Int J Wireless Inf Networks

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Dynamic code allocation for integrated voice and multi‐priority data traffic in CDMA networks

Geraniotis

Chang

Yang

1995

Trans Emerging Tel Tech

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In the context of deriving schemes for efficient use of the spectrum by multi-media users in direct-sequence code-division multiple-access (DSKDMA) networks we describe in this paper an optimal policy for CDMA code allocation to voice and multi-priority data traffic We consider CDMA networks with voice traffic and two types of data traffic: high priority data traffic with the same priority as voice traffic that requires real-time delivery and lower priority data traffic that can tolerate delay and thus can be queued. A movable boundary policy in the CDMA code domain is used for the voice and high priority data, whereas a small number of CDMA codes are reserved for the lower priority data which also utilizes any CDMA codes left unused by the other two traffic types. The optimal policy is obtained by minimizing a cost function consisting of the weighted sum of the rejection rates of voice and high priority data traffic subject to performance requirements (bit error rates or BER) on all traffic types. The queueing delay of the lower priority data traffic is also evaluated. A semi-Markov decision process (SMDP) with guaranteed BERs for voice and data traffic is used for formulating the dynamic code assignment problem. A value-iteration algorithm is applied to this SMDP to derive the optimal policy. [ 151 M. B. Pursley,: The role of spread spectrum in pocket radio networks. Proceedings o f the IEEE. January 1987.1968. p.73-9 1.

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Matched loads simulation using ghost basis functions for moment‐method analysis: Applications to microwave planar circuits

Delabie¹,

Delplanque²,

Pribetich³

et al. 1994

Micro & Optical Tech Letters

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A clever way to simulate numerical matched loads is presented and applied in the mathematical framework of the moment method. This approach presents a lot of advantages with regard to other numerical matched load simulations, and could be used whateier the shape of the planar circuit without the help of the characteristic impedance concept. Results show that very good efficiency is obtained for the reflection coefficient of such matched loads. Typical results are exhibited for S‐parameter determination of multipart microstrip circuits. © 1994 John Wiley & Sons, Inc.

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Wireless network access for personal communications

Cited by 145 publications

References 42 publications

Wireless loops: What are they?

Wireless loops: What are they?

Dynamic code allocation for integrated voice and multi‐priority data traffic in CDMA networks

Matched loads simulation using ghost basis functions for moment‐method analysis: Applications to microwave planar circuits

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