Air interface access schemes for broadband mobile systems

Progler, M.; Evci, C.; Umehira, Masahiro

doi:10.1109/35.790969

Cited by 30 publications

(12 citation statements)

References 2 publications

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“…The arithmetic operations over the RNS can be carried out on a residue-by-residue basis, which can be expressed as [26] ( 3) where on the left of (3) the operation represents moduloaddition, subtraction, or multiplication of two integers and at the right of (3) is increased by one, whenever hops happened. According to (3), this can be implemented by increasing each element of by one with respect to their corresponding modulus. Note that although the maximum integer represented by the RNS-based registers is , this will not prevent us from using it as a synchronous transmission reference.…”

Section: B Rns-based Ffhmentioning

confidence: 99%

“…Specifically, the tones (2, 3, 5), (5,7,6), and (3, 4, 2) were activated, which convey the 8FSK symbols 1, 3, and 5, respectively, derived below. As an example, we assign the unique MUD signature addresses (1, 2, 4), (2,4,3), and (6, 7, 5) to users 1, 2, and 3. The three time-frequency matrices obtained by modulo-8 subtraction of the unique addresses from according to (6) for users , and are denoted by , as well as in Fig.…”

Section: B Conventional Single-user Detectionmentioning

confidence: 99%

“…Step 2) Based on the th user's FH address and on the reference register's instantaneous value of , we derive the residue sequence as follows: (4) according to (3).…”

Section: B Rns-based Ffhmentioning

confidence: 99%

“…Naturally, providing an increased number of traffic channels requires more bandwidth. The last decade has witnessed a paradigm shift from narrowband wireless systems to broadband wireless systems [2], [3]. This trend continued with the recent emergence of the family of ultra-wideband (UWB) systems [4], which have received considerable attention both in North America [4]- [9] and in Europe.…”

mentioning

confidence: 99%

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Residue number system assisted fast frequency-hopped synchronous ultra-wideband spread-spectrum multiple-access: a design alternative to impulse radio

Yang

Hanzo

2002

IEEE J. Select. Areas Commun.

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Abstract-Ultra-wideband (UWB) systems having a bandwidth on the order of gigahertz have recently received wide attention both in the U.S. and in Europe. The family of UWB systems may communicate either by generating ultra-wideband signals or with the aid of innovatively combining conventional narrowband, wideband, or broadband signals. At the time of writing, UWB systems have only been implemented using ultra-wideband signals, such as those known from impulse radio systems. Hence, in this paper, UWB systems using narrowband signals are explored as a design alternative, which are based on the well-known family of frequency-hopping (FH) spread-spectrum multiple-access techniques. In the proposed UWB system, FH is implemented using multistage frequency-hpping multiple access (MS/UWB FHMA). We highlight the principles of the synchronous MS/UWB FHMA communication system, investigate the associated spectrum assignment, and the residue number system (RNS) based FH strategy. Detection of the received signal can be achieved with the aid of existing fast FH signal detection schemes. Our study shows that the RNS assisted FH strategy is capable of efficiently dividing the huge number of users supported by the synchronous MS/UWB FHMA system into a number of reduced-size user groups, where the multiuser interference only affects the users within the same group. Since the number of users in each group is only a small fraction of the total number of users supported by the synchronous MS/UWB FHMA system, advanced multiuser detection algorithms can be employed for achieving near-single-user performance at an acceptable complexity. Our results show that MS/UWB FHMA is capable of supporting an extremely high number of users, while employing relatively simple receivers.Index Terms-Frequency-hopping (FH), multiuser detection (MUD), residue number system (RNS), spread-spectrum multiple access (SSMA), ultra-wide bandwidth radio.

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Section: B Rns-based Ffhmentioning

confidence: 99%

Section: B Conventional Single-user Detectionmentioning

confidence: 99%

“…Step 2) Based on the th user's FH address and on the reference register's instantaneous value of , we derive the residue sequence as follows: (4) according to (3).…”

Section: B Rns-based Ffhmentioning

confidence: 99%

mentioning

confidence: 99%

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Residue number system assisted fast frequency-hopped synchronous ultra-wideband spread-spectrum multiple-access: a design alternative to impulse radio

Yang

Hanzo

2002

IEEE J. Select. Areas Commun.

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show abstract

“…Code-division multiple access (CDMA) schemes have been considered as attractive multiple access schemes in both second-generation (2G) and third-generation (3G) wireless systems. Recently interest in wireless communications has been shifting in the direction of broadband systems [1,2]. This is mainly due to the expected spread of the wireless Internet and the continued dramatic increase in demand for all types of advanced wireless multimedia services, including conventional voice and data transmissions.…”

Section: Introductionmentioning

confidence: 99%